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• Webcast Q&A: Qualcomm Provides a Seamless Experience for Customers with Oracle WebCenter

  - by kellsey.ruppel

  Last Thursday we had the second webcast in our WebCenter in Action webcast series, "Qualcomm Provides a Seamless Experience for Customers with Oracle WebCenter, where customer Michael Chander from Qualcomm and Vince Casarez & Gourav Goyal from Oracle Partner Keste shared how Oracle WebCenter is powering Qualcomm’s externally facing website and providing a seamless experience for their customers. In case you missed it, here's a recap of the Q&A.   Mike Chandler, Qualcomm Q: Did you run into any issues when integrating all of the different applications together?A: Definitely, our main challenges were in the area of user provisioning and security propagation, all the standard stuff you might expect when hooking up SSO for authentication and authorization. In addition, we spent several iterations getting the UI’s in sync. While everyone was given the same digital material to build too, each team interpreted and implemented it their own way. Initially as a user navigated, if you were looking for it, you could slight variations in color or font or width , stuff like that. So we had to pull all the developers responsible for the UI together and get pixel level agreement on a lot of things so we could ensure seamless transitions across applications. Q: What has been the biggest benefit your end users have seen?A: Wow, there have been several. An SSO enabled environment was huge a win for our users. The portal application that this replaced had not really been invested in by the business. With this project, we had full business participation and backing, and it really showed in some key areas like the shopping experience. For example, while ordering in the previous site, the items did not have any pictures or really usable descriptions. A tremendous amount of work was done to try and make the site more intuitive and user friendly. Site performance has also drastically improved thanks to new hardware, improved database design, and of course the fact that ADF has made great strides in runtime performance. Q: Was there any resistance internally when implementing the solution? If so, how did you overcome that?A: Within a large company, I’m sure there is always going to be competition for large projects, as there was here. Once we got through the technical analysis and settled on the technology choices, it was actually no resistance to implementing the solution. This project was fully driven by the business with the aim of long term growth. I can confidently say that the fact that this project was given the utmost importance by both the business and IT really help put down any resistance that you would typically see while implementing a new solution. Q: Given the performance, what do you estimate to be the top end capacity of the system? A:I think our top end capacity is really only limited by our hardware. I’m comfortable saying we could grow 10x on our current hardware, both in terms of transactions and users. We can easily spin up new JVM instances if needed. We already use less JVM’s than we had planned. In addition, ADF is doing a very good job with his connection pooling and application module pooling, so we see a very good ratio of users connected to the systems vs db connections, without impacting performace. Q: What's the overview or summary of feedback from the users interacting with the site?A: Feedback has been overwhelmingly positive from both the business and our customers. They’re very happy with the new SSO environment , the new LAF, and the performance of the site. Of course, it’s not all roses. No matter what, there are always going to be people that don’t like the layout or the color scheme, etc. By and large though, customers are happy and the business is happy. Q: Can you describe the impressions about the site before and after the project within Qualcomm?A: Before the project, the site worked and people were using it, but most people were not happy with it. It was slow and tended to be a bit tempermental, for example a user would perform a transaction and the system would throw and unexpected error. The user could back up and retry the steps and things would work fine, so why didn’t work the first time?. From a UI perspective, we’d hear comments like it looked like it was built by a high school student.  Vince Casarez & Gourav Goyal, Keste Q: Did you run into any obstacles when implementing the solution?A: It's interesting some people call them "obstacles" on this project we just called them "dependencies".  There were both technical and business related dependencies that we had to work out. Mike points out the SSO dependencies and the coordination and synchronization between the teams to have a seamless login experience and a seamless end user experience.  There was also a set of dependencies on the User Acceptance testing to make sure that everyone understood the use cases for how the system would be used.  With a branching into a new market and trying to match a simple user experience as many consumer sites have today, there was always a tendency for the team members to provide their suggestions on how things could be simpler.  But with all the work up front on the user design and getting the business driving this set of experiences, this minimized the downstream suggestions that tend to distract a team.  In this case, all the work up front allowed us to enumerate the "dependencies" and keep the distractions to a minimum. Q: Was there a lot of custom work that needed to be done for this particular solution?A: The focus for this particular solution was really on the custom processes. The interesting thing is that with the data flows and the integration with applications, there are some pre-built integrations, but realistically for the process flow, we had to build those. The framework and tooling we used made things easier so we didn’t have to implement core functionality, like transitioning from screen to screen or from flow to flow. The design feature of Task Flows really helped speed the development and keep the component infrastructure in line with the dynamic processes.  Task flows and other elements like Skins are core to the infrastructure or technology stack of Oracle. This then allowed the team to center the project focus around the business flows and use cases to meet the core requirements and keep the project on time. Q: What do you think were the keys to success for rolling out WebCenter?A:  The 5 main keys to success were: 1) Sponsorship from the whole organization around this project from senior executive agreement, business owners driving functionality, and IT development alignment; 2) Upfront design planning and use case definition to clearly define the project scope and requirements; 3) Focussed development and project management aligned with the top level goals and drivers; 4) User acceptance and usability testing along the way to identify potential issues and direct resolution of the issues;  and 5) Constant prioritization of the issues for development to fix by the business.  It also helps to have great team chemistry and really smart people working on the project. If you missed the webcast, be sure to catch the replay to see a live demonstration of WebCenter in action!  Qualcomm Provides a Seamless Experience for Customers with Oracle WebCenter from Oracle WebCenter

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• Different Not Automatically Implies Better

  - by Alois Kraus

  Originally posted on: http://geekswithblogs.net/akraus1/archive/2013/11/05/154556.aspxRecently I was digging deeper why some WCF hosted workflow application did consume quite a lot of memory although it did basically only load a xaml workflow. The first tool of choice is Process Explorer or even better Process Hacker (has more options and the best feature copy&paste does work). The three most important numbers of a process with regards to memory are Working Set, Private Working Set and Private Bytes. Working set is the currently consumed physical memory (parts can be shared between processes e.g. loaded dlls which are read only) Private Working Set is the physical memory needed by this process which is not shareable Private Bytes is the number of non shareable which is only visible in the current process (e.g. all new, malloc, VirtualAlloc calls do create private bytes) When you have a bigger workflow it can consume under 64 bit easily 500MB for a 1-2 MB xaml file. This does not look very scalable. Under 64 bit the issue is excessive private bytes consumption and not the managed heap. The picture is quite different for 32 bit which looks a bit strange but it seems that the hosted VB compiler is a lot less memory hungry under 32 bit. I did try to repro the issue with a medium sized xaml file (400KB) which does contain 1000 variables and 1000 if which can be represented by C# code like this: string Var1; string Var2; ... string Var1000; if (!String.IsNullOrEmpty(Var1) ) { Console.WriteLine(“Var1”); } if (!String.IsNullOrEmpty(Var2) ) { Console.WriteLine(“Var2”); } ....   Since WF is based on VB.NET expressions you are bound to the hosted VB.NET compiler which does result in (x64) 140 MB of private bytes which is ca. 140 KB for each if clause which is quite a lot if you think about the actually present functionality. But there is hope. .NET 4.5 does allow now C# expressions for WF which is a major step forward for all C# lovers. I did create some simple patcher to “cross compile” my xaml to C# expressions. Lets look at the result: C# Expressions VB Expressions x86 x86 On my home machine I have only 32 bit which gives you quite exactly half of the memory consumption under 64 bit. C# expressions are 10 times more memory hungry than VB.NET expressions! I wanted to do more with less memory but instead it did consume a magnitude more memory. That is surprising to say the least. The workflow does initialize in about the same time under x64 and x86 where the VB code does it in 2s whereas the C# version needs 18s. Also nearly ten times slower. That is a too high price to pay for any bigger sized xaml workflow to convert from VB.NET to C# expressions. If I do reduce the number of expressions to 500 then it does need 400MB which is about half of the memory. It seems that the cost per if does rise linear with the number of total expressions in a xaml workflow.  Expression Language Cost per IF Startup Time C# 1000 Ifs x64 1,5 MB 18s C# 500 Ifs x64 750 KB 9s VB 1000 Ifs x64 140 KB 2s VB 500 Ifs x64 70 KB 1s Now we can directly compare two MS implementations. It is clear that the VB.NET compiler uses the same underlying structure but it has much higher offset compared to the highly inefficient C# expression compiler. I have filed a connect bug here with a harsher wording about recent advances in memory consumption. The funniest thing is that one MS employee did give an Azure AppFabric demo around early 2011 which was so slow that he needed to investigate with xperf. He was after startup time and the call stacks with regards to VB.NET expression compilation were remarkably similar. In fact I only found this post by googling for parts of my call stacks. … “C# expressions will be coming soon to WF, and that will have different performance characteristics than VB” … What did he know Jan 2011 what I did no know until today? ;-). He knew that C# expression will come but that they will not be automatically have better footprint. It is about time to fix that. In its current state C# expressions are not usable for bigger workflows. That also explains the headline for today. You can cheat startup time by prestarting workflows so that the demo looks nice and snappy but it does hurt scalability a lot since you do need much more memory than necessary. I did find the stacks by enabling virtual allocation tracking within XPerf which is still the best tool out there. But first you need to look at your process to check where the memory is hiding: For the C# Expression compiler you do not need xperf. You can directly dump the managed heap and check with a profiler of your choice. But if the allocations are happening on the Private Data ( VirtualAlloc ) you can find it with xperf. There is a nice video on channel 9 explaining VirtualAlloc tracking it in greater detail. If your data allocations are on the Heap it does mean that the C/C++ runtime did create a heap for you where all malloc, new calls do allocate from it. You can enable heap tracing with xperf and full call stack support as well which is doable via xperf like it is shown also on channel 9. Or you can use WPRUI directly: To make “Heap Usage” it work you need to set for your executable the tracing flags (before you start it). For example devenv.exe HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options\devenv.exe DWORD TracingFlags 1 Do not forget to disable it after you did complete profiling the process or it will impact the startup time quite a lot. You can with xperf attach directly to a running process and collect heap allocation information from a gone wild process. Very handy if you need to find out what a process was doing which has arrived in a funny state. “VirtualAlloc usage” does work without explicitly enabling stuff for a specific process and is always on machine wide. I had issues on my Windows 7 machines with the call stack collection and the latest Windows 8.1 Performance Toolkit. I was told that WPA from Windows 8.0 should work fine but I do not want to downgrade.

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• We've completed the first iteration

  - by CliveT

  There are a lot of features in C# that are implemented by the compiler and not by the underlying platform. One such feature is a lambda expression. Since local variables cannot be accessed once the current method activation finishes, the compiler has to go out of its way to generate a new class which acts as a home for any variable whose lifetime needs to be extended past the activation of the procedure. Take the following example:     Random generator = new Random();     Func func = () = generator.Next(10); In this case, the compiler generates a new class called c_DisplayClass1 which is marked with the CompilerGenerated attribute. [CompilerGenerated] private sealed class c__DisplayClass1 {     // Fields     public Random generator;     // Methods     public int b__0()     {         return this.generator.Next(10);     } } Two quick comments on this: (i)    A display was the means that compilers for languages like Algol recorded the various lexical contours of the nested procedure activations on the stack. I imagine that this is what has led to the name. (ii)    It is a shame that the same attribute is used to mark all compiler generated classes as it makes it hard to figure out what they are being used for. Indeed, you could imagine optimisations that the runtime could perform if it knew that classes corresponded to certain high level concepts. We can see that the local variable generator has been turned into a field in the class, and the body of the lambda expression has been turned into a method of the new class. The code that builds the Func object simply constructs an instance of this class and initialises the fields to their initial values.     c__DisplayClass1 class2 = new c__DisplayClass1();     class2.generator = new Random();     Func func = new Func(class2.b__0); Reflector already contains code to spot this pattern of code and reproduce the form containing the lambda expression, so this is example is correctly decompiled. The use of compiler generated code is even more spectacular in the case of iterators. C# introduced the idea of a method that could automatically store its state between calls, so that it can pick up where it left off. The code can express the logical flow with yield return and yield break denoting places where the method should return a particular value and be prepared to resume.         {             yield return 1;             yield return 2;             yield return 3;         } Of course, there was already a .NET pattern for expressing the idea of returning a sequence of values with the computation proceeding lazily (in the sense that the work for the next value is executed on demand). This is expressed by the IEnumerable interface with its Current property for fetching the current value and the MoveNext method for forcing the computation of the next value. The sequence is terminated when this method returns false. The C# compiler links these two ideas together so that an IEnumerator returning method using the yield keyword causes the compiler to produce the implementation of an Iterator. Take the following piece of code.         IEnumerable GetItems()         {             yield return 1;             yield return 2;             yield return 3;         } The compiler implements this by defining a new class that implements a state machine. This has an integer state that records which yield point we should go to if we are resumed. It also has a field that records the Current value of the enumerator and a field for recording the thread. This latter value is used for optimising the creation of iterator instances. [CompilerGenerated] private sealed class d__0 : IEnumerable, IEnumerable, IEnumerator, IEnumerator, IDisposable {     // Fields     private int 1__state;     private int 2__current;     public Program 4__this;     private int l__initialThreadId; The body gets converted into the code to construct and initialize this new class. private IEnumerable GetItems() {     d__0 d__ = new d__0(-2);     d__.4__this = this;     return d__; } When the class is constructed we set the state, which was passed through as -2 and the current thread. public d__0(int 1__state) {     this.1__state = 1__state;     this.l__initialThreadId = Thread.CurrentThread.ManagedThreadId; } The state needs to be set to 0 to represent a valid enumerator and this is done in the GetEnumerator method which optimises for the usual case where the returned enumerator is only used once. IEnumerator IEnumerable.GetEnumerator() {     if ((Thread.CurrentThread.ManagedThreadId == this.l__initialThreadId)               && (this.1__state == -2))     {         this.1__state = 0;         return this;     } The state machine itself is implemented inside the MoveNext method. private bool MoveNext() {     switch (this.1__state)     {         case 0:             this.1__state = -1;             this.2__current = 1;             this.1__state = 1;             return true;         case 1:             this.1__state = -1;             this.2__current = 2;             this.1__state = 2;             return true;         case 2:             this.1__state = -1;             this.2__current = 3;             this.1__state = 3;             return true;         case 3:             this.1__state = -1;             break;     }     return false; } At each stage, the current value of the state is used to determine how far we got, and then we generate the next value which we return after recording the next state. Finally we return false from the MoveNext to signify the end of the sequence. Of course, that example was really simple. The original method body didn't have any local variables. Any local variables need to live between the calls to MoveNext and so they need to be transformed into fields in much the same way that we did in the case of the lambda expression. More complicated MoveNext methods are required to deal with resources that need to be disposed when the iterator finishes, and sometimes the compiler uses a temporary variable to hold the return value. Why all of this explanation? We've implemented the de-compilation of iterators in the current EAP version of Reflector (7). This contrasts with previous version where all you could do was look at the MoveNext method and try to figure out the control flow. There's a fair amount of things we have to do. We have to spot the use of a CompilerGenerated class which implements the Enumerator pattern. We need to go to the class and figure out the fields corresponding to the local variables. We then need to go to the MoveNext method and try to break it into the various possible states and spot the state transitions. We can then take these pieces and put them back together into an object model that uses yield return to show the transition points. After that Reflector can carry on optimising using its usual optimisations. The pattern matching is currently a little too sensitive to changes in the code generation, and we only do a limited analysis of the MoveNext method to determine use of the compiler generated fields. In some ways, it is a pity that iterators are compiled away and there is no metadata that reflects the original intent. Without it, we are always going to dependent on our knowledge of the compiler's implementation. For example, we have noticed that the Async CTP changes the way that iterators are code generated, so we'll have to do some more work to support that. However, with that warning in place, we seem to do a reasonable job of decompiling the iterators that are built into the framework. Hopefully, the EAP will give us a chance to find examples where we don't spot the pattern correctly or regenerate the wrong code, and we can improve things. Please give it a go, and report any problems.

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• parallel_for_each from amp.h – part 1

  - by Daniel Moth

  This posts assumes that you've read my other C++ AMP posts on index<N> and extent<N>, as well as about the restrict modifier. It also assumes you are familiar with C++ lambdas (if not, follow my links to C++ documentation). Basic structure and parameters Now we are ready for part 1 of the description of the new overload for the concurrency::parallel_for_each function. The basic new parallel_for_each method signature returns void and accepts two parameters: a grid<N> (think of it as an alias to extent) a restrict(direct3d) lambda, whose signature is such that it returns void and accepts an index of the same rank as the grid So it looks something like this (with generous returns for more palatable formatting) assuming we are dealing with a 2-dimensional space: // some_code_A parallel_for_each( g, // g is of type grid<2> [ ](index<2> idx) restrict(direct3d) { // kernel code } ); // some_code_B The parallel_for_each will execute the body of the lambda (which must have the restrict modifier), on the GPU. We also call the lambda body the "kernel". The kernel will be executed multiple times, once per scheduled GPU thread. The only difference in each execution is the value of the index object (aka as the GPU thread ID in this context) that gets passed to your kernel code. The number of GPU threads (and the values of each index) is determined by the grid object you pass, as described next. You know that grid is simply a wrapper on extent. In this context, one way to think about it is that the extent generates a number of index objects. So for the example above, if your grid was setup by some_code_A as follows: extent<2> e(2,3); grid<2> g(e); ...then given that: e.size()==6, e[0]==2, and e[1]=3 ...the six index<2> objects it generates (and hence the values that your lambda would receive) are:    (0,0) (1,0) (0,1) (1,1) (0,2) (1,2) So what the above means is that the lambda body with the algorithm that you wrote will get executed 6 times and the index<2> object you receive each time will have one of the values just listed above (of course, each one will only appear once, the order is indeterminate, and they are likely to call your code at the same exact time). Obviously, in real GPU programming, you'd typically be scheduling thousands if not millions of threads, not just 6. If you've been following along you should be thinking: "that is all fine and makes sense, but what can I do in the kernel since I passed nothing else meaningful to it, and it is not returning any values out to me?" Passing data in and out It is a good question, and in data parallel algorithms indeed you typically want to pass some data in, perform some operation, and then typically return some results out. The way you pass data into the kernel, is by capturing variables in the lambda (again, if you are not familiar with them, follow the links about C++ lambdas), and the way you use data after the kernel is done executing is simply by using those same variables. In the example above, the lambda was written in a fairly useless way with an empty capture list: [ ](index<2> idx) restrict(direct3d), where the empty square brackets means that no variables were captured. If instead I write it like this [&](index<2> idx) restrict(direct3d), then all variables in the some_code_A region are made available to the lambda by reference, but as soon as I try to use any of those variables in the lambda, I will receive a compiler error. This has to do with one of the direct3d restrictions, where only one type can be capture by reference: objects of the new concurrency::array class that I'll introduce in the next post (suffice for now to think of it as a container of data). If I write the lambda line like this [=](index<2> idx) restrict(direct3d), all variables in the some_code_A region are made available to the lambda by value. This works for some types (e.g. an integer), but not for all, as per the restrictions for direct3d. In particular, no useful data classes work except for one new type we introduce with C++ AMP: objects of the new concurrency::array_view class, that I'll introduce in the post after next. Also note that if you capture some variable by value, you could use it as input to your algorithm, but you wouldn’t be able to observe changes to it after the parallel_for_each call (e.g. in some_code_B region since it was passed by value) – the exception to this rule is the array_view since (as we'll see in a future post) it is a wrapper for data, not a container. Finally, for completeness, you can write your lambda, e.g. like this [av, &ar](index<2> idx) restrict(direct3d) where av is a variable of type array_view and ar is a variable of type array - the point being you can be very specific about what variables you capture and how. So it looks like from a large data perspective you can only capture array and array_view objects in the lambda (that is how you pass data to your kernel) and then use the many threads that call your code (each with a unique index) to perform some operation. You can also capture some limited types by value, as input only. When the last thread completes execution of your lambda, the data in the array_view or array are ready to be used in the some_code_B region. We'll talk more about all this in future posts… (a)synchronous Please note that the parallel_for_each executes as if synchronous to the calling code, but in reality, it is asynchronous. I.e. once the parallel_for_each call is made and the kernel has been passed to the runtime, the some_code_B region continues to execute immediately by the CPU thread, while in parallel the kernel is executed by the GPU threads. However, if you try to access the (array or array_view) data that you captured in the lambda in the some_code_B region, your code will block until the results become available. Hence the correct statement: the parallel_for_each is as-if synchronous in terms of visible side-effects, but asynchronous in reality.   That's all for now, we'll revisit the parallel_for_each description, once we introduce properly array and array_view – coming next. Comments about this post by Daniel Moth welcome at the original blog.

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• Data Source Connection Pool Sizing

  - by Steve Felts

  Normal 0 false false false EN-US X-NONE X-NONE MicrosoftInternetExplorer4 /* Style Definitions */ table.MsoNormalTable {mso-style-name:"Table Normal"; mso-tstyle-rowband-size:0; mso-tstyle-colband-size:0; mso-style-noshow:yes; mso-style-priority:99; mso-style-qformat:yes; mso-style-parent:""; mso-padding-alt:0in 5.4pt 0in 5.4pt; mso-para-margin:0in; mso-para-margin-bottom:.0001pt; mso-pagination:widow-orphan; font-size:10.0pt; font-family:"Times New Roman","serif";} One of the most time-consuming procedures of a database application is establishing a connection. The connection pooling of the data source can be used to minimize this overhead.  That argues for using the data source instead of accessing the database driver directly. Configuring the size of the pool in the data source is somewhere between an art and science – this article will try to move it closer to science.  From the beginning, WLS data source has had an initial capacity and a maximum capacity configuration values.  When the system starts up and when it shrinks, initial capacity is used.  The pool can grow to maximum capacity.  Customers found that they might want to set the initial capacity to 0 (more on that later) but didn’t want the pool to shrink to 0.  In WLS 10.3.6, we added minimum capacity to specify the lower limit to which a pool will shrink.  If minimum capacity is not set, it defaults to the initial capacity for upward compatibility.   We also did some work on the shrinking in release 10.3.4 to reduce thrashing; the algorithm that used to shrink to the maximum of the currently used connections or the initial capacity (basically the unused connections were all released) was changed to shrink by half of the unused connections. The simple approach to sizing the pool is to set the initial/minimum capacity to the maximum capacity.  Doing this creates all connections at startup, avoiding creating connections on demand and the pool is stable.  However, there are a number of reasons not to take this simple approach. When WLS is booted, the deployment of the data source includes synchronously creating the connections.  The more connections that are configured in initial capacity, the longer the boot time for WLS (there have been several projects for parallel boot in WLS but none that are available).  Related to creating a lot of connections at boot time is the problem of logon storms (the database gets too much work at one time).   WLS has a solution for that by setting the login delay seconds on the pool but that also increases the boot time. There are a number of cases where it is desirable to set the initial capacity to 0.  By doing that, the overhead of creating connections is deferred out of the boot and the database doesn’t need to be available.  An application may not want WLS to automatically connect to the database until it is actually needed, such as for some code/warm failover configurations. There are a number of cases where minimum capacity should be less than maximum capacity.  Connections are generally expensive to keep around.  They cause state to be kept on both the client and the server, and the state on the backend may be heavy (for example, a process).  Depending on the vendor, connection usage may cost money.  If work load is not constant, then database connections can be freed up by shrinking the pool when connections are not in use.  When using Active GridLink, connections can be created as needed according to runtime load balancing (RLB) percentages instead of by connection load balancing (CLB) during data source deployment. Shrinking is an effective technique for clearing the pool when connections are not in use.  In addition to the obvious reason that there times where the workload is lighter,  there are some configurations where the database and/or firewall conspire to make long-unused or too-old connections no longer viable.  There are also some data source features where the connection has state and cannot be used again unless the state matches the request.  Examples of this are identity based pooling where the connection has a particular owner and XA affinity where the connection is associated with a particular RAC node.  At this point, WLS does not re-purpose (discard/replace) connections and shrinking is a way to get rid of the unused existing connection and get a new one with the correct state when needed. So far, the discussion has focused on the relationship of initial, minimum, and maximum capacity.  Computing the maximum size requires some knowledge about the application and the current number of simultaneously active users, web sessions, batch programs, or whatever access patterns are common.  The applications should be written to only reserve and close connections as needed but multiple statements, if needed, should be done in one reservation (don’t get/close more often than necessary).  This means that the size of the pool is likely to be significantly smaller then the number of users.   If possible, you can pick a size and see how it performs under simulated or real load.  There is a high-water mark statistic (ActiveConnectionsHighCount) that tracks the maximum connections concurrently used.  In general, you want the size to be big enough so that you never run out of connections but no bigger.   It will need to deal with spikes in usage, which is where shrinking after the spike is important.  Of course, the database capacity also has a big influence on the decision since it’s important not to overload the database machine.  Planning also needs to happen if you are running in a Multi-Data Source or Active GridLink configuration and expect that the remaining nodes will take over the connections when one of the nodes in the cluster goes down.  For XA affinity, additional headroom is also recommended.  In summary, setting initial and maximum capacity to be the same may be simple but there are many other factors that may be important in making the decision about sizing.

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• &lt;%: %&gt;, HtmlEncode, IHtmlString and MvcHtmlString

  - by Shaun

  One of my colleague and friend, Robin is playing and struggling with the ASP.NET MVC 2 on a project these days while I’m struggling with a annoying client. Since it’s his first time to use ASP.NET MVC he was meetings with a lot of problem and I was very happy to share my experience to him. Yesterday he asked me when he attempted to insert a <br /> element into his page he found that the page was rendered like this which is bad. He found his <br /> was shown as a part of the string rather than creating a new line. After checked a bit in his code I found that it’s because he utilized a new ASP.NET markup supported in .NET 4.0 – “<%: %>”. If you have been using ASP.NET MVC 1 or in .NET 3.5 world it would be very common that using <%= %> to show something on the page from the backend code. But when you do it you must ensure that the string that are going to be displayed should be Html-safe, which means all the Html markups must be encoded. Otherwise this might cause an XSS (cross-site scripting) problem. So that you’d better use the code like this below to display anything on the page. In .NET 4.0 Microsoft introduced a new markup to solve this problem which is <%: %>. It will encode the content automatically so that you will no need to check and verify your code manually for the XSS issue mentioned below. But this also means that it will encode all things, include the Html element you want to be rendered. So I changed his code like this and it worked well. After helped him solved this problem and finished a spreadsheet for my boring project I considered a bit more on the <%: %>. Since it will encode all thing why it renders correctly when we use “<%: Html.TextBox(“name”) %>” to show a text box? As you know the Html.TextBox will render a “<input name="name" id="name" type="text"/>” element on the page. If <%: %> will encode everything it should not display a text box. So I dig into the source code of the MVC and found some comments in the class MvcHtmlString. 1: // In ASP.NET 4, a new syntax <%: %> is being introduced in WebForms pages, where <%: expression %> is equivalent to 2: // <%= HttpUtility.HtmlEncode(expression) %>. The intent of this is to reduce common causes of XSS vulnerabilities 3: // in WebForms pages (WebForms views in the case of MVC). This involves the addition of an interface 4: // System.Web.IHtmlString and a static method overload System.Web.HttpUtility::HtmlEncode(object). The interface 5: // definition is roughly: 6: // public interface IHtmlString { 7: // string ToHtmlString(); 8: // } 9: // And the HtmlEncode(object) logic is roughly: 10: // - If the input argument is an IHtmlString, return argument.ToHtmlString(), 11: // - Otherwise, return HtmlEncode(Convert.ToString(argument)). 12: // 13: // Unfortunately this has the effect that calling <%: Html.SomeHelper() %> in an MVC application running on .NET 4 14: // will end up encoding output that is already HTML-safe. As a result, we're changing out HTML helpers to return 15: // MvcHtmlString where appropriate. <%= Html.SomeHelper() %> will continue to work in both .NET 3.5 and .NET 4, but 16: // changing the return types to MvcHtmlString has the added benefit that <%: Html.SomeHelper() %> will also work 17: // properly in .NET 4 rather than resulting in a double-encoded output. MVC developers in .NET 4 will then be able 18: // to use the <%: %> syntax almost everywhere instead of having to remember where to use <%= %> and where to use 19: // <%: %>. This should help developers craft more secure web applications by default. 20: // 21: // To create an MvcHtmlString, use the static Create() method instead of calling the protected constructor. The comment said the encoding rule of the <%: %> would be: If the type of the content is IHtmlString it will NOT encode since the IHtmlString indicates that it’s Html-safe. Otherwise it will use HtmlEncode to encode the content. If we check the return type of the Html.TextBox method we will find that it’s MvcHtmlString, which was implemented the IHtmlString interface dynamically. That is the reason why the “<input name="name" id="name" type="text"/>” was not encoded by <%: %>. So if we want to tell ASP.NET MVC, or I should say the ASP.NET runtime that the content is Html-safe and no need, or should not be encoded we can convert the content into IHtmlString. So another resolution would be like this. Also we can create an extension method as well for better developing experience. 1: using System; 2: using System.Collections.Generic; 3: using System.Linq; 4: using System.Web; 5: using System.Web.Mvc; 6:  7: namespace ShaunXu.Blogs.IHtmlStringIssue 8: { 9: public static class Helpers 10: { 11: public static MvcHtmlString IsHtmlSafe(this string content) 12: { 13: return MvcHtmlString.Create(content); 14: } 15: } 16: } Then the view would be like this. And the page rendered correctly.         Summary In this post I explained a bit about the new markup in .NET 4.0 – <%: %> and its usage. I also explained a bit about how to control the page content, whether it should be encoded or not. We can see the ASP.NET MVC gives us more points to control the web pages.   Hope this helps, Shaun All documents and related graphics, codes are provided "AS IS" without warranty of any kind. Copyright © Shaun Ziyan Xu. This work is licensed under the Creative Commons License.

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• Curl, twitter oauth problem

  - by Darxval

  Does anyone see a problem with the following Curl call / how the Oauth request is built? (i am trying to get a correctly setup request so i can finish my app) So i am calling the following CURL call: C:\>curl -v -k --data-urlencode "status=Testing2" -H "Authorization: OAuth realm='', oauth_nonce=1276107867blah, oauth_timestamp=1276107867, oauth_consumer_key=yJDLH7BDdVi1OKIINSV7Q, oauth_signature_method=HMAC-SHA1, oauth_version=1.0, oauth_signature=NWU4MDdlNjk0OGIxYWQ1YTkyNmU5YjU1NGYyOTczMmU5ZDg5 YWNkNA==, staus=Testing2 " http://twitter.com/statuses/update.xml?status=Testing2 and i recieve this: * About to connect() to twitter.com port 80 (#0) * Trying 168.143.162.68... connected * Connected to twitter.com (168.143.162.68) port 80 (#0) > POST /statuses/update.xml?status=Testing2 HTTP/1.1 > User-Agent: curl/7.20.1 (i386-pc-win32) libcurl/7.20.1 OpenSSL/0.9.8n zlib/1.2.5 libidn/1.18 libssh2/1.2.5 > Host: twitter.com > Accept: */* > Authorization: OAuth realm='', oauth_nonce=1276106370blah, oauth_timestamp=1276106370, oauth_consumer_key=yJDLH7BDdVi1OKIINSV7Q, oauth_signature_method=HMAC-SHA1, oauth_version=1.0, oauth_signature=MjQzNDA1MGU4NGRmMWVjMzUwZmQ4YzE5NzMzY2I1ZDJlOTRkNmQ2Zg==, staus=Testing2 > Content-Length: 15 > Content-Type: application/x-www-form-urlencoded > < HTTP/1.1 401 Unauthorized < Date: Wed, 09 Jun 2010 18:00:22 GMT < Server: hi < Status: 401 Unauthorized < WWW-Authenticate: Basic realm="Twitter API" < X-Runtime: 0.00548 < Content-Type: application/xml; charset=utf-8 < Content-Length: 164 < Cache-Control: no-cache, max-age=1800 < Set-Cookie: k=209.234.229.21.1276106420885412; path=/; expires=Wed, 16-Jun-10 18:00:20 GMT; domain=.twitter.com < Set-Cookie: guest_id=127610642214871948; path=/; expires=Fri, 09 Jul 2010 18:00:22 GMT < Set-Cookie: _twitter_sess=BAh7CDoPY3JlYXRlZF9hdGwrCIm33h0pAToHaWQiJTkyMjllODE0NTdiYWE1%250AMWU1MzBmNjgwMTFiMDhkYjdlIgpmbGFzaElDOidBY3Rpb25Db250cm9sbGVy%250AOjpGbGFzaDo6Rmxhc2hIYXNoewAGOgpAdXNlZHsA--8ebb3c62d461d28f8fda7b8adab642af66969f7e; domain=.twitter.com; path=/ < Expires: Wed, 09 Jun 2010 18:30:20 GMT < Vary: Accept-Encoding < Connection: close < <?xml version="1.0" encoding="UTF-8"?> <hash> <request>/statuses/update.xml?status=Testing2</request> <error>Could not authenticate with OAuth.</error> </hash> * Closing connection #0 my Parameters are setup like so: var parameters = [encodeURIComponent("status="+status),encodeURIComponent("oauth_token="+ac_token),encodeURIComponent("oauth_consumer_key="+"yJDLH7BDdVi1OKIINSV7Q"),encodeURIComponent("oauth_nonce="+nonce,"oauth_signature_method=HMAC-SHA1"),encodeURIComponent("oauth_timestamp="+timestamp),encodeURIComponent("oauth_version=1.0")] var join = parameters.join("&"); var eparamjoin =encodeURIComponent(join); The key is like so: var key=con_secret+"&"+ac_secret; Signature base string is: var signaturebs = "POST&"+encodeURIComponent(url)+"&"+eparamjoin; giving this: POST&http%3A%2F%2Ftwitter.com%2Fstatuses%2Fupdate.xml&status%253DTesting2%26oauth_token%253D142715285-yi2ch324S3zfyKyJby6WDUZOhCsiQuKNUtc3nAGe%26oauth_consumer_key%253DyJDLH7BDdVi1OKIINSV7Q%26oauth_nonce%253D1276107867blah%26oauth_timestamp%253D1276107867%26oauth_version%253D1.0 and signature built like so: var hmac = Crypto.HMAC(Crypto.SHA1, signaturebs,key ); var signature=Base64.encode(hmac); making the signature: NWU4MDdlNjk0OGIxYWQ1YTkyNmU5YjU1NGYyOTczMmU5ZDg5YWNkNA== Any help would be appreciated thank you!

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• The model item passed into the dictionary is of type ‘mvc.Models.ModelA’ but this dictionary require

  - by Malcolm Frexner

  I have this annoying mistake in some of my builds. There is no error in the project, because if I build again, then the problem disappears. The message only appears, when the site is deployed to a Windows 2008 Server. I first thought that it might be an issue with temporary files, but thats not the case. I deployed the build to a different web and the error still appears. The error appears on random actions of the site. Most of the time builds are ok, but each 3rd or 4th build produces runtime errors. I build using a WebdeploymentProject in release mode. Views are precompiled. It's not http://stackoverflow.com/questions/178194/in-asp-net-mvc-i-encounter-an-incorrect-type-error-when-rendering-a-page-with-the, because views have totally different names. How I can debug this problem or how I can get help for this? Here is my WebDeploymentProject <!-- Microsoft Visual Studio 2008 Web Deployment Project http://go.microsoft.com/fwlink/?LinkID=104956 --> <Project ToolsVersion="3.5" DefaultTargets="Build" xmlns="http://schemas.microsoft.com/developer/msbuild/2003"> <PropertyGroup> <Configuration Condition=" '$(Configuration)' == '' ">Debug</Configuration> <Platform Condition=" '$(Platform)' == '' ">AnyCPU</Platform> <ProductVersion>9.0.21022</ProductVersion> <SchemaVersion>2.0</SchemaVersion> <ProjectGuid>{E5E14CEB-0BCD-4203-9A5A-34ABA9C717EA}</ProjectGuid> <SourceWebPhysicalPath>..\B2CWeb</SourceWebPhysicalPath> <SourceWebProject>{3E632DB6-6DB3-4BD0-8CCA-12DE67165B48}|B2CWeb\B2CWeb.csproj</SourceWebProject> <SourceWebVirtualPath>/B2CWeb.csproj</SourceWebVirtualPath> <TargetFrameworkVersion>v3.5</TargetFrameworkVersion> </PropertyGroup> <PropertyGroup Condition=" '$(Configuration)|$(Platform)' == 'Debug|AnyCPU' "> <DebugSymbols>true</DebugSymbols> <OutputPath>.\Debug</OutputPath> <EnableUpdateable>false</EnableUpdateable> <UseMerge>true</UseMerge> <SingleAssemblyName>B2CWeb_Build</SingleAssemblyName> </PropertyGroup> <PropertyGroup Condition=" '$(Configuration)|$(Platform)' == 'Release|AnyCPU' "> <DebugSymbols>false</DebugSymbols> <OutputPath>..\B2CWeb_Deploy\</OutputPath> <EnableUpdateable>false</EnableUpdateable> <UseMerge>true</UseMerge> <SingleAssemblyName>B2C_Web</SingleAssemblyName> <ContentAssemblyName> </ContentAssemblyName> <DeleteAppCodeCompiledFiles>false</DeleteAppCodeCompiledFiles> </PropertyGroup> <ItemGroup> </ItemGroup> <Import Project="$(MSBuildExtensionsPath)\Microsoft\WebDeployment\v9.0\Microsoft.WebDeployment.targets" /> <!-- To modify your build process, add your task inside one of the targets below and uncomment it. Other similar extension points exist, see Microsoft.WebDeployment.targets. <Target Name="BeforeBuild"> </Target> <Target Name="BeforeMerge"> </Target> <Target Name="AfterMerge"> </Target> <Target Name="AfterBuild"> </Target> --> </Project>

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• Iphone SDK - adding UITableView to UIView

  - by Shashi

  Hi, I am trying to learn how to use different views, for this sample test app, i have a login page, upon successful logon, the user is redirected to a table view and then upon selection of an item in the table view, the user is directed to a third page showing details of the item. the first page works just fine, but the problem occurs when i go to the second page, the table shown doesn't have title and i cannot add title or toolbar or anything other than the content of the tables themselves. and when i click on the item, needless to say nothing happens. no errors as well. i am fairly new to programming and have always worked on Java but never on C(although i have some basic knowledge of C) and Objective C is new to me. Here is the code. import @interface NavigationTestAppDelegate : NSObject { UIWindow *window; UIViewController *viewController; IBOutlet UITextField *username; IBOutlet UITextField *password; IBOutlet UILabel *loginError; //UINavigationController *navigationController; } @property (nonatomic, retain) IBOutlet UIViewController *viewController; @property (nonatomic, retain) IBOutlet UIWindow *window; @property (nonatomic, retain) IBOutlet UITextField *username; @property (nonatomic, retain) IBOutlet UITextField *password; @property (nonatomic, retain) IBOutlet UILabel *loginError; -(IBAction) login; -(IBAction) hideKeyboard: (id) sender; @end import "NavigationTestAppDelegate.h" import "RootViewController.h" @implementation NavigationTestAppDelegate @synthesize window; @synthesize viewController; @synthesize username; @synthesize password; @synthesize loginError; pragma mark - pragma mark Application lifecycle -(IBAction) hideKeyboard: (id) sender{ [sender resignFirstResponder]; } (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions { // Override point for customization after app launch //RootViewController *rootViewController = [[RootViewController alloc] init]; //[window addSubview:[navigationController view]]; [window addSubview:[viewController view]]; [window makeKeyAndVisible]; return YES; } -(IBAction) login { RootViewController *rootViewController = [[RootViewController alloc] init]; //NSString *user = [[NSString alloc] username. if([username.text isEqualToString:@"test"]&&[password.text isEqualToString:@"test"]){ [window addSubview:[rootViewController view]]; //[window addSubview:[navigationController view]]; [window makeKeyAndVisible]; //rootViewController.awakeFromNib; } else { loginError.text = @"LOGIN ERROR"; [window addSubview:[viewController view]]; [window makeKeyAndVisible]; } } (void)applicationWillTerminate:(UIApplication *)application { // Save data if appropriate } pragma mark - pragma mark Memory management (void)dealloc { //[navigationController release]; [viewController release]; [window release]; [super dealloc]; } @end import @interface RootViewController : UITableViewController { IBOutlet NSMutableArray *views; } @property (nonatomic, retain) IBOutlet NSMutableArray * views; @end // // RootViewController.m // NavigationTest // // Created by guest on 4/23/10. // Copyright MyCompanyName 2010. All rights reserved. // import "RootViewController.h" import "OpportunityOne.h" @implementation RootViewController @synthesize views; //@synthesize navigationViewController; pragma mark - pragma mark View lifecycle (void)viewDidLoad { views = [ [NSMutableArray alloc] init]; OpportunityOne *opportunityOneController; for (int i=1; i<=20; i++) { opportunityOneController = [[OpportunityOne alloc] init]; opportunityOneController.title = [[NSString alloc] initWithFormat:@"Opportunity %i",i]; [views addObject:[NSDictionary dictionaryWithObjectsAndKeys: [[NSString alloc] initWithFormat:@"Opportunity %i",i], @ "title", opportunityOneController, @"controller", nil]]; self.title=@"GPS"; } /*UIBarButtonItem *temporaryBarButtonItem = [[UIBarButtonItem alloc] init]; temporaryBarButtonItem.title = @"Back"; self.navigationItem.backBarButtonItem = temporaryBarButtonItem; [temporaryBarButtonItem release]; */ //self.title =@"Global Platform for Sales"; [super viewDidLoad]; //[temporaryBarButtonItem release]; //[opportunityOneController release]; // Uncomment the following line to display an Edit button in the navigation bar for this view controller. // self.navigationItem.rightBarButtonItem = self.editButtonItem; } pragma mark - pragma mark Table view data source // Customize the number of sections in the table view. - (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView { return 1; } // Customize the number of rows in the table view. - (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section { return [views count]; } // Customize the appearance of table view cells. - (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath { static NSString *CellIdentifier = @"Cell"; UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier]; if (cell == nil) { cell = [[[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:CellIdentifier] autorelease]; } // Configure the cell. cell.textLabel.text = [[views objectAtIndex:indexPath.row] objectForKey:@"title"]; return cell; } pragma mark - pragma mark Table view delegate (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath { //UIViewController *targetViewController = [[views objectAtIndex:indexPath.row] objectForKey:@"controller"]; UIViewController *targetViewController = [[views objectAtIndex:indexPath.row] objectForKey:@"controller"]; [[self navigationController] pushViewController:targetViewController animated:YES]; } pragma mark - pragma mark Memory management (void)didReceiveMemoryWarning { // Releases the view if it doesn't have a superview. [super didReceiveMemoryWarning]; // Relinquish ownership any cached data, images, etc that aren't in use. } (void)viewDidUnload { // Relinquish ownership of anything that can be recreated in viewDidLoad or on demand. // For example: self.myOutlet = nil; } (void)dealloc { [views release]; [super dealloc]; } @end Wow, i was finding it real hard to post the code. i apologize for the bad formatting, but i just couldn't get past the formatting rules for this text editor. Thanks, Shashi

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• Log4Net with ASP.NET MVC...nothing happens...

  - by twal

  I am trying to use log4Net with Asp.net MVC and I cannot get anything to happen with it. i created a config that is in my web project root. Here is that config file. <log4net> <root> <level value="INFO" /> <appender-ref ref="RollingLogFileAppender"/> </root> <appender name="RollingFileAppender" type="log4net.Appender.RollingFileAppender"> <file value="C:\DWSApplicationFiles\AppLogs\app.log" /> <appendToFile value="true" /> <rollingStyle value="Size" /> <maxSizeRollBackups value="10" /> <maximumFileSize value="100KB" /> <staticLogFileName value="true" /> <layout type="log4net.Layout.PatternLayout"> <conversionPattern value="%d [%t]%-5p %c [%x] - %m%n" /> </layout> </appender> <appender name="RollingLogFileAppender" type="log4net.Appender.RollingFileAppender"> <file value="C:\DWSApplicationFiles\AppLogs\app.log" /> <appendToFile value="false" /> <datePattern value="-dddd" /> <rollingStyle value="Date" /> <layout type="log4net.Layout.PatternLayout"> <conversionPattern value="%d [%t]%-5p %c [%x] - %m%n" /> </layout> </appender> </log4net> Before I am asked, yes the application has permissions to write to the directory. I use have tested this and the application has permissions to this directoy. here is where I am trying to use log4net. public class HomeController : Controller { readonly log4net.ILog log = log4net.LogManager.GetLogger(System.Reflection.MethodBase.GetCurrentMethod().DeclaringType); public ActionResult Index() { log.Error("In Index "); return View(); } } when I run the appliction and go to this controller. Log4net does nothing. it doesn't create the files in that directory or anything. I have enabled internal debugging for lognet and I get no output errors in the console. This is all i see from log4net log4net: log4net assembly [log4net, Version=1.2.10.0, Culture=neutral, PublicKeyToken=1b44e1d426115821]. Loaded from [C:\Users\twaldron.BULLFROGSPAS\AppData\Local\Temp\Temporary ASP.NET Files\root\7642c99a\60feb7f2\assembly\dl3\17247033\008dfd6d_e2d0ca01\log4net.DLL]. (.NET Runtime [2.0.50727.4952] on Microsoft Windows NT 6.1.7600.0) log4net: DefaultRepositorySelector: defaultRepositoryType [log4net.Repository.Hierarchy.Hierarchy] log4net: DefaultRepositorySelector: Creating repository for assembly [Bullfrog.DWS.Web, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null] log4net: DefaultRepositorySelector: Assembly [Bullfrog.DWS.Web, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null] Loaded From [C:\Users\twaldron.BULLFROGSPAS\AppData\Local\Temp\Temporary ASP.NET Files\root\7642c99a\60feb7f2\assembly\dl3\2960c79f\b876bb2d_aca7cb01\Bullfrog.DWS.Web.DLL] log4net: DefaultRepositorySelector: Assembly [Bullfrog.DWS.Web, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null] does not have a RepositoryAttribute specified. log4net: DefaultRepositorySelector: Assembly [Bullfrog.DWS.Web, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null] using repository [log4net-default-repository] and repository type [log4net.Repository.Hierarchy.Hierarchy] log4net: DefaultRepositorySelector: Creating repository [log4net-default-repository] using type [log4net.Repository.Hierarchy.Hierarchy] 'WebDev.WebServer20.EXE' (Managed (v2.0.50727)): Loaded 'Anonymously Hosted DynamicMethods Assembly'

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• Uninitialized constant Encoding with sqlite3-ruby on windows

  - by Ben Scheirman

  On a new machine, installed ruby with the 1-click installer for windows. Installed rails 2.3.2 and all associated gems, then I installed the sqlite3 binaries (into the c:\ruby\bin folder). Lastly I did gem install sqlite3-ruby -v=1.2.3 (which is apparently the latest version that works with windows) This error happens when I run rake db:migrate or when any ActiveRecord object is touched at runtime. The error looks like this: ** Invoke db:migrate (first_time) ** Invoke environment (first_time) ** Execute environment ** Execute db:migrate rake aborted! **uninitialized constant Encoding** <---- Any help resolving this error would be greatly appreciated! Trace: C:/Ruby/lib/ruby/gems/1.8/gems/activesupport-2.3.2/lib/active_support/dependencies.rb:443:in `load_missing_constant' C:/Ruby/lib/ruby/gems/1.8/gems/activesupport-2.3.2/lib/active_support/dependencies.rb:80:in `const_missing' C:/Ruby/lib/ruby/gems/1.8/gems/activesupport-2.3.2/lib/active_support/dependencies.rb:92:in `const_missing' C:/Ruby/lib/ruby/gems/1.8/gems/sqlite3-0.0.3/lib/sqlite3/encoding.rb:9:in `find' C:/Ruby/lib/ruby/gems/1.8/gems/sqlite3-0.0.3/lib/sqlite3/database.rb:69:in `initialize' C:/Ruby/lib/ruby/gems/1.8/gems/activerecord-2.3.2/lib/active_record/connection_adapters/sqlite3_adapter.rb:13:in `new' C:/Ruby/lib/ruby/gems/1.8/gems/activerecord-2.3.2/lib/active_record/connection_adapters/sqlite3_adapter.rb:13:in `sqlite3_connection' C:/Ruby/lib/ruby/gems/1.8/gems/activerecord-2.3.2/lib/active_record/connection_adapters/abstract/connection_pool.rb:223:in `send' C:/Ruby/lib/ruby/gems/1.8/gems/activerecord-2.3.2/lib/active_record/connection_adapters/abstract/connection_pool.rb:223:in `new_connection' C:/Ruby/lib/ruby/gems/1.8/gems/activerecord-2.3.2/lib/active_record/connection_adapters/abstract/connection_pool.rb:245:in `checkout_new_connection' C:/Ruby/lib/ruby/gems/1.8/gems/activerecord-2.3.2/lib/active_record/connection_adapters/abstract/connection_pool.rb:188:in `checkout' C:/Ruby/lib/ruby/gems/1.8/gems/activerecord-2.3.2/lib/active_record/connection_adapters/abstract/connection_pool.rb:184:in `loop' C:/Ruby/lib/ruby/gems/1.8/gems/activerecord-2.3.2/lib/active_record/connection_adapters/abstract/connection_pool.rb:184:in `checkout' C:/Ruby/lib/ruby/1.8/monitor.rb:242:in `synchronize' C:/Ruby/lib/ruby/gems/1.8/gems/activerecord-2.3.2/lib/active_record/connection_adapters/abstract/connection_pool.rb:183:in `checkout' C:/Ruby/lib/ruby/gems/1.8/gems/activerecord-2.3.2/lib/active_record/connection_adapters/abstract/connection_pool.rb:98:in `connection' C:/Ruby/lib/ruby/gems/1.8/gems/activerecord-2.3.2/lib/active_record/connection_adapters/abstract/connection_pool.rb:326:in `retrieve_connection' C:/Ruby/lib/ruby/gems/1.8/gems/activerecord-2.3.2/lib/active_record/connection_adapters/abstract/connection_specification.rb:123:in `retrieve_connection' C:/Ruby/lib/ruby/gems/1.8/gems/activerecord-2.3.2/lib/active_record/connection_adapters/abstract/connection_specification.rb:115:in `connection' C:/Ruby/lib/ruby/gems/1.8/gems/activerecord-2.3.2/lib/active_record/migration.rb:435:in `initialize' C:/Ruby/lib/ruby/gems/1.8/gems/activerecord-2.3.2/lib/active_record/migration.rb:400:in `new' C:/Ruby/lib/ruby/gems/1.8/gems/activerecord-2.3.2/lib/active_record/migration.rb:400:in `up' C:/Ruby/lib/ruby/gems/1.8/gems/activerecord-2.3.2/lib/active_record/migration.rb:383:in `migrate' C:/Ruby/lib/ruby/gems/1.8/gems/rails-2.3.2/lib/tasks/databases.rake:116 C:/Ruby/lib/ruby/gems/1.8/gems/rake-0.8.7/lib/rake.rb:636:in `call' C:/Ruby/lib/ruby/gems/1.8/gems/rake-0.8.7/lib/rake.rb:636:in `execute' C:/Ruby/lib/ruby/gems/1.8/gems/rake-0.8.7/lib/rake.rb:631:in `each' C:/Ruby/lib/ruby/gems/1.8/gems/rake-0.8.7/lib/rake.rb:631:in `execute' C:/Ruby/lib/ruby/gems/1.8/gems/rake-0.8.7/lib/rake.rb:597:in `invoke_with_call_chain' C:/Ruby/lib/ruby/1.8/monitor.rb:242:in `synchronize' C:/Ruby/lib/ruby/gems/1.8/gems/rake-0.8.7/lib/rake.rb:590:in `invoke_with_call_chain' C:/Ruby/lib/ruby/gems/1.8/gems/rake-0.8.7/lib/rake.rb:583:in `invoke' C:/Ruby/lib/ruby/gems/1.8/gems/rake-0.8.7/lib/rake.rb:2051:in `invoke_task' C:/Ruby/lib/ruby/gems/1.8/gems/rake-0.8.7/lib/rake.rb:2029:in `top_level' C:/Ruby/lib/ruby/gems/1.8/gems/rake-0.8.7/lib/rake.rb:2029:in `each' C:/Ruby/lib/ruby/gems/1.8/gems/rake-0.8.7/lib/rake.rb:2029:in `top_level' C:/Ruby/lib/ruby/gems/1.8/gems/rake-0.8.7/lib/rake.rb:2068:in `standard_exception_handling' C:/Ruby/lib/ruby/gems/1.8/gems/rake-0.8.7/lib/rake.rb:2023:in `top_level' C:/Ruby/lib/ruby/gems/1.8/gems/rake-0.8.7/lib/rake.rb:2001:in `run' C:/Ruby/lib/ruby/gems/1.8/gems/rake-0.8.7/lib/rake.rb:2068:in `standard_exception_handling' C:/Ruby/lib/ruby/gems/1.8/gems/rake-0.8.7/lib/rake.rb:1998:in `run' C:/Ruby/lib/ruby/gems/1.8/gems/rake-0.8.7/bin/rake:31 C:/Ruby/bin/rake:19:in `load' C:/Ruby/bin/rake:19

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• codility challenge, test case OK , Evaluation report Wrong Answer

  - by Hussein Fawzy

  the aluminium 2014 gives me wrong answer [3 , 9 , -6 , 7 ,-3 , 9 , -6 , -10] got 25 expected 28 but when i repeated the challenge with the same code and make case test it gives me the correct answer Your test case [3, 9, -6, 7, -3, 9, -6, -10] : NO RUNTIME ERRORS (returned value: 28) what is the wrong with it ??? the challenge :- A non-empty zero-indexed array A consisting of N integers is given. A pair of integers (P, Q), such that 0 = P = Q < N, is called a slice of array A. The sum of a slice (P, Q) is the total of A[P] + A[P+1] + ... + A[Q]. The maximum sum is the maximum sum of any slice of A. For example, consider array A such that: A[0] = 3 A[1] = 2 A[2] = -6 A[3] = 3 A[4] = 1 For example (0, 1) is a slice of A that has sum A[0] + A[1] = 5. This is the maximum sum of A. You can perform a single swap operation in array A. This operation takes two indices I and J, such that 0 = I = J < N, and exchanges the values of A[I] and A[J]. To goal is to find the maximum sum you can achieve after performing a single swap. For example, after swapping elements 2 and 4, you will get the following array A: A[0] = 3 A[1] = 2 A[2] = 1 A[3] = 3 A[4] = -6 After that, (0, 3) is a slice of A that has the sum A[0] + A[1] + A[2] + A[3] = 9. This is the maximum sum of A after a single swap. Write a function: class Solution { public int solution(int[] A); } that, given a non-empty zero-indexed array A of N integers, returns the maximum sum of any slice of A after a single swap operation. For example, given: A[0] = 3 A[1] = 2 A[2] = -6 A[3] = 3 A[4] = 1 the function should return 9, as explained above. and my code is :- import java.math.*; class Solution { public int solution(int[] A) { if(A.length == 1) return A[0]; else if (A.length==2) return A[0]+A[1]; else{ int finalMaxSum = A[0]; for (int l=0 ; l<A.length ; l++){ for (int k = l+1 ; k<A.length ; k++ ){ int [] newA = A; int temp = newA[l]; newA [l] = newA[k]; newA[k]=temp; int maxSum = newA[0]; int current_max = newA[0]; for(int i = 1; i < newA.length; i++) { current_max = Math.max(A[i], current_max + newA[i]); maxSum = Math.max(maxSum, current_max); } finalMaxSum = Math.max(finalMaxSum , maxSum); } } return finalMaxSum; } } } i don't know what's the wrong with it ??

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• Issue with Sharepoint 2010 application page

  - by Matt Moriarty

  I am relatively new to Sharepoint and am using version 2010. I am having a problem with the following code in an application page I am trying to build: using System; using Microsoft.SharePoint; using Microsoft.SharePoint.WebControls; using System.Text; using Microsoft.SharePoint.Administration; using Microsoft.Office.Server; using Microsoft.Office.Server.UserProfiles; using Microsoft.SharePoint.Utilities; namespace SharePointProject5.Layouts.SharePointProject5 { public partial class ApplicationPage1 : LayoutsPageBase { protected void Page_Load(object sender, EventArgs e) { SPContext context = SPContext.Current; StringBuilder output = new StringBuilder(); using(SPSite site = context.Site) using (SPWeb web = site.AllWebs["BDC_SQL"]) { UserProfileManager upmanager = new UserProfileManager(ServerContext.GetContext(site)); string ListMgr = ""; string ADMgr = ""; bool allowUpdates = web.AllowUnsafeUpdates; web.AllowUnsafeUpdates = true; web.Update(); SPListCollection listcollection = web.Lists; SPList list = listcollection["BDC_SQL"]; foreach (SPListItem item in list.Items) { output.AppendFormat("<br>From List - Name & manager: {0} , {1}", item["ADName"], item["Manager_ADName"]); UserProfile uProfile = upmanager.GetUserProfile(item["ADName"].ToString()); output.AppendFormat("<br>From Prof - Name & manager: {0} , {1}", uProfile[PropertyConstants.DistinguishedName], uProfile[PropertyConstants.Manager]); ListMgr = item["Manager_ADName"].ToString(); ADMgr = Convert.ToString(uProfile[PropertyConstants.Manager]); if (ListMgr != ADMgr) { output.AppendFormat("<br>This record requires updating from {0} to {1}", uProfile[PropertyConstants.Manager], item["Manager_ADName"]); uProfile[PropertyConstants.Manager].Value = ListMgr; uProfile.Commit(); output.AppendFormat("<br>This record has had its manager updated"); } else { output.AppendFormat("<br>This record does not need to be updated"); } } web.AllowUnsafeUpdates = allowUpdates; web.Update(); } Label1.Text = output.ToString(); } } } Everything worked fine up until I added in the 'uProfile.Commit();' line. Now I am getting the following error message: Microsoft.SharePoint.SPException was unhandled by user code Message=Updates are currently disallowed on GET requests. To allow updates on a GET, set the 'AllowUnsafeUpdates' property on SPWeb. Source=Microsoft.SharePoint ErrorCode=-2130243945 NativeErrorMessage=FAILED hr detected (hr = 0x80004005) NativeStackTrace="" StackTrace: at Microsoft.SharePoint.SPGlobal.HandleComException(COMException comEx) at Microsoft.SharePoint.Library.SPRequest.ValidateFormDigest(String bstrUrl, String bstrListName) at Microsoft.SharePoint.SPWeb.ValidateFormDigest() at Microsoft.Office.Server.UserProfiles.UserProfile.UpdateBlobProfile() at Microsoft.Office.Server.UserProfiles.UserProfile.Commit() at SharePointProject5.Layouts.SharePointProject5.ApplicationPage1.Page_Load(Object sender, EventArgs e) at System.Web.Util.CalliHelper.EventArgFunctionCaller(IntPtr fp, Object o, Object t, EventArgs e) at System.Web.Util.CalliEventHandlerDelegateProxy.Callback(Object sender, EventArgs e) at System.Web.UI.Control.OnLoad(EventArgs e) at Microsoft.SharePoint.WebControls.UnsecuredLayoutsPageBase.OnLoad(EventArgs e) at Microsoft.SharePoint.WebControls.LayoutsPageBase.OnLoad(EventArgs e) at System.Web.UI.Control.LoadRecursive() at System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) InnerException: System.Runtime.InteropServices.COMException Message=<nativehr>0x80004005</nativehr><nativestack></nativestack>Updates are currently disallowed on GET requests. To allow updates on a GET, set the 'AllowUnsafeUpdates' property on SPWeb. Source="" ErrorCode=-2130243945 StackTrace: at Microsoft.SharePoint.Library.SPRequestInternalClass.ValidateFormDigest(String bstrUrl, String bstrListName) at Microsoft.SharePoint.Library.SPRequest.ValidateFormDigest(String bstrUrl, String bstrListName) InnerException: I have tried to rectify this by adding in code to allow the unsafe updates but I still get this error. Does anyone have any guidance for me? It would be much appreciated. Thanks in advance, Matt.

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• How do I use C# and ADO.NET to query an Oracle table with a spatial column of type SDO_GEOMETRY?

  - by John Donahue

  My development machine is running Windows 7 Enterprise, 64-bit version. I am using Visual Studio 2010 Release Candidate. I am connecting to an Oracle 11g Enterprise server version 11.1.0.7.0. I had a difficult time locating Oracle client software that is made for 64-bit Windows systems and eventually landed here to download what I assume is the proper client connectivity software. I added a reference to "Oracle.DataAccess" which is version 2.111.6.0 (Runtime Version is v2.0.50727). I am targeting .NET CLR version 4.0 since all properties of my VS Solution are defaults and this is 2010 RC. I was then able to write a console application in C# that established connectivity, executed a SELECT statement, and properly returned data when the table in question does NOT contain a spatial column. My problem is that this no longer works when the table I query has a column of type SDO_GEOMETRY in it. Below is the simple console application I am trying to run that reproduces the problem. When the code gets to the line with the "ExecuteReader" command, an exception is raised and the message is "Unsupported column datatype". using System; using System.Data; using Oracle.DataAccess.Client; namespace ConsoleTestOracle { class Program { static void Main(string[] args) { string oradb = string.Format("Data Source={0};User Id={1};Password={2};", "hostname/servicename", "login", "password"); try { using (OracleConnection conn = new OracleConnection(oradb)) { conn.Open(); OracleCommand cmd = new OracleCommand(); cmd.Connection = conn; cmd.CommandText = "select * from SDO_8307_2D_POINTS"; cmd.CommandType = CommandType.Text; OracleDataReader dr = cmd.ExecuteReader(); } } catch (Exception e) { string error = e.Message; } } } } The fact that this code works when used against a table that does not contain a spatial column of type SDO_GEOMETRY makes me think I have my windows 7 machine properly configured so I am surprised that I get this exception when the table contains different kinds of columns. I don't know if there is some configuration on my machine or the Oracle machine that needs to be done, or if the Oracle client software I have installed is wrong, or old and needs to be updated. Here is the SQL I used to create the table, populate it with some rows containing points in the spatial column, etc. if you want to try to reproduce this exactly. SQL Create Commands: create table SDO_8307_2D_Points (ObjectID number(38) not null unique, TestID number, shape SDO_GEOMETRY); Insert into SDO_8307_2D_Points values (1, 1, SDO_GEOMETRY(2001, 8307, null, SDO_ELEM_INFO_ARRAY(1, 1, 1), SDO_ORDINATE_ARRAY(10.0, 10.0))); Insert into SDO_8307_2D_Points values (2, 2, SDO_GEOMETRY(2001, 8307, null, SDO_ELEM_INFO_ARRAY(1, 1, 1), SDO_ORDINATE_ARRAY(10.0, 20.0))); insert into user_sdo_geom_metadata values ('SDO_8307_2D_Points', 'SHAPE', SDO_DIM_ARRAY(SDO_DIM_ELEMENT('Lat', -180, 180, 0.05), SDO_DIM_ELEMENT('Long', -90, 90, 0.05)), 8307); create index SDO_8307_2D_Point_indx on SDO_8307_2D_Points(shape) indextype is mdsys.spatial_index PARAMETERS ('sdo_indx_dims=2' ); Any advice or insights would be greatly appreciated. Thank you.

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• Nasty mono bug with F#

  - by Aurimas Anskaitis

  Hi, I have this monstrous f# 2.0 program My mono version is Mono JIT compiler version 2.9 (master/f593354 Sun Dec 26 03:15:55 EET 2010) Copyright (C) 2002-2010 Novell, Inc and Contributors. www.mono-project.com TLS: __thread SIGSEGV: altstack Notifications: epoll Architecture: x86 Disabled: none Misc: softdebug LLVM: supported, not enabled. GC: Included Boehm (with typed GC and Parallel Mark) //--------------------------------------------- module Main let rec gcd x y = if y = 0 then x else gcd y (x%y) let main = printfn "%i" (gcd 4 2) main //----------------------------------------------- And the problem is that output from running the program is as follows: Stacktrace: at (wrapper managed-to-native) System.Reflection.MonoMethodInfo.get_parameter_info (intptr,System.Reflection.MemberInfo) <0xffffffff at System.Reflection.MonoMethodInfo.GetParametersInfo (intptr,System.Reflection.MemberInfo) <0x00013 at System.Reflection.MonoCMethod.GetParameters () <0x00015 at System.Reflection.MonoCMethod.Invoke (object,System.Reflection.BindingFlags,System.Reflection.Binder,object[],System.Globalization.CultureInfo) <0x00035 at System.Reflection.MonoCMethod.Invoke (System.Reflection.BindingFlags,System.Reflection.Binder,object[],System.Globalization.CultureInfo) <0x00024 at System.Reflection.ConstructorInfo.Invoke (object[]) <0x0003f at System.Activator.CreateInstance (System.Type,bool) <0x0017c at System.Activator.CreateInstance (System.Type) <0x00012 at Microsoft.FSharp.Reflection.FSharpValue.MakeFunction (System.Type,Microsoft.FSharp.Core.FSharpFunc2<object, object>) <0x00145> at Microsoft.FSharp.Core.PrintfImpl.capture@529<b, c, d> (Microsoft.FSharp.Core.FSharpFunc2, Microsoft.FSharp.Core.FSharpFunc`2<char, Microsoft.FSharp.Core.Unit>, Microsoft.FSharp.Core.FSharpFunc`2,string,int,Microsoft.FSharp.Collections.FSharpList1<object>,System.Type,int) <0x00147> at Microsoft.FSharp.Core.PrintfImpl.gprintf<b, c, d, a> (Microsoft.FSharp.Core.FSharpFunc2, Microsoft.FSharp.Core.FSharpFunc`2<char, Microsoft.FSharp.Core.Unit>, Microsoft.FSharp.Core.FSharpFunc`2,Microsoft.FSharp.Core.PrintfFormat4<a, b, c, d>) <0x000dd> at Microsoft.FSharp.Core.PrintfModule.kprintf_imperative<a, b, c> (Microsoft.FSharp.Core.FSharpFunc2,b,Microsoft.FSharp.Core.FSharpFunc2<char, Microsoft.FSharp.Core.Unit>,Microsoft.FSharp.Core.PrintfFormat4) <0x00058 at Microsoft.FSharp.Core.PrintfModule.PrintFormatToTextWriterThen (Microsoft.FSharp.Core.FSharpFunc2<Microsoft.FSharp.Core.Unit, TResult>,System.IO.TextWriter,Microsoft.FSharp.Core.PrintfFormat4) <0x0004d at Microsoft.FSharp.Core.PrintfModule.PrintFormatLineToTextWriter (System.IO.TextWriter,Microsoft.FSharp.Core.PrintfFormat`4) <0x0004d at .$Main.main@ () <0x00042 Native stacktrace: mono() [0x80dc13b] mono() [0x811c65b] mono() [0x8059a11] [0x7af40c] mono() [0x8228214] mono() [0x8228214] mono() [0x8228214] mono() [0x8228214] mono() [0x8228214] mono() [0x8228214] mono() [0x8228214] mono() [0x8228214] mono() [0x8228282] mono() [0x822991e] mono() [0x822aa9d] mono(mono_array_new_specific+0xea) [0x813ba9a] mono() [0x81c63a1] mono() [0x8149ac8] [0xc04328] [0xc042e4] [0xc042be] [0xc0455e] [0xc0451d] [0xc044d8] [0xc0349d] [0xc0330b] [0xc02f9e] [0xbfe960] [0xbfe6c6] [0xbfe571] [0xbfe4de] [0xbfe44e] [0xbf9d2b] [0x9bf0724] [0x9bf0724] [0x9bf0724] [0x9bf0724] [0x9bf0724] [0x9bf0724] [0x9bf0724] [0x9bf0724] [0x9bf0724] [0x9bf0724] [0x9bf0724] [0x9bf0724] [0x9bf0724] [0x9bf0724] [0x9bf0724] [0x9bf0724] [0x9bf0724] [0x9bf0724] [0x9bf0724] [0x9bf0724] [0x9bf0724] [0x9bf0724] [0x9bf0724] [0x9bf0724] [0x9bf0724] [0x9bf0724] [0x9bf0724] [0x9bf0724] [0x9bf0724] [0x9bf0724] [0x9bf0724] [0x9bf0724] [0x9bf0724] [0x9bf0724] [0x9bf0724] [0x9bf0724] [0x9bf0724] [0x9bf0724] [0x9bf0724] [0x9bf0724] [0x9bf0724] [0x9bf0724] [0x9bf0724] [0x9bf0724] [0x9bf0724] [0x9bf0724] [0x9bf0724] [0x9bf0724] [0x9bf0724] [0x9bf0724] [0x9bf0724] [0x9bf0724] [0x9bf0724] [0x9bf0724] [0x9bf0724] [0x9bf0724] [0x9bf0724] [0x9bf0724] [0x9bf0724] [0x9bf0724] [0x9bf0724] [0x9bf0724] [0x9bf0724] [0x9bf0724] [0x9bf0724] [0x9bf0724] [0x9bf0724] [0x9bf0724] [0x9bf0724] [0x9bf0724] [0x9bf0724] [0x9bf0724] [0x9bf0724] [0x9bf0724] [0x9bf0724] [0x9bf0724] [0x9bf0724] [0x9bf0724] [0x9bf0724] [0x9bf0724] [0x9bf0724] [0x9bf0724] [0x9bf0724] [0x9bf0724] [0x9bf0724] [0x9bf0724] [0x9bf0724] [0x9bf0724] [0x9bf0724] [0x9bf0724] [0x9bf0724] [0x9bf0724] [0x9bf0724] [0x9bf0724] [0x9bf0724] [0x9bf0724] [0x9bf0724] [0x9bf0724] [0x9bf0724] [0x9bf0724] [0x9bf0724] [0x9bf0724] [0x9bf0724] [0x9bf0724] [0x9bf0724] [0x9bf0724] [0x9bf0724] [0x9bf0724] [0x9bf0724] [0x9bf0724] [0x9bf0724] [0x9bf0724] [0x9bf0724] [0x9bf0724] [0x9bf0724] [0x9bf0724] [0x9bf0724] [0x9bf0724] [0x9bf0724] [0x9bf0724] [0x9bf0724] [0x9bf0724] [0x9bf0724] [0x9bf0724] [0x9bf0724] [0x9bf0724] [0x9bf0724] [0x9bf0724] [0x9bf0724] [0x9bf0724] [0x9bf0724] [0x9bf0724] [0x9bf0724] [0x9bf0724] [0x9bf0724] [0x9bf0724] [0x9bf0724] [0x9bf0724] [0x9bf0724] [0x9bf0724] [0x9bf0724] [0x9bf0724] [0x9bf0724] [0x9bf0724] [0x9bf0724] [0x9bf0724] [0x9bf0724] [0x9bf0724] [0x9bf0724] [0x9bf0724] [0x9bf0724] [0x9bf0724] [0x9bf0724] [0x9bf0724] [0x9bf0724] [0x9bf0724] [0x9bf0724] [0x9bf0724] [0x9bf0724] [0x9bf0724] [0x9bf0724] [0x9bf0724] [0x9bf0724] [0x9bf0724] [0x9bf0724] [0x9bf0724] [0x9bf0724] [0x9bf0724] [0x9bf0724] [0x9bf0724] [0x9bf0724] [0x9bf0724] [0x9bf0724] [0x9bf0724] [0x9bf0724] [0x9bf0724] [0x9bf0724] [0x9bf0724] [0x9bf0724] [0x9bf0724] [0x9bf0724] [0x9bf0724] [0x9bf0724] [0x9bf0724] [0x9bf0724] [0x9bf0724] [0x9bf0724] [0x9bf0724] [0x9bf0724] [0x9bf0724] [0x9bf0724] [0x9bf0724] [0x9bf0724] [0x9bf0724] [0x9bf0724] [0x9bf0724] [0x9bf0724] [0x9bf0724] [0x9bf0724] [0x9bf0724] [0x9bf0724] [0x9bf0724] [0x9bf0724] [0x9bf0724] [0x9bf0724] [0x9bf0724] [0x9bf0724] [0x9bf0724] [0x9bf0724] [0x9bf0724] [0x9bf0724] [0x9bf0724] [0x9bf0724] [0x9bf0724] [0x9bf0724] [0x9bf0724] [0x9bf0724] [0x9bf0724] [0x9bf0724] [0x9bf0724] [0x9bf0724] [0x9bf0724] [0x9bf0724] Debug info from gdb: Could not attach to process. If your uid matches the uid of the target process, check the setting of /proc/sys/kernel/yama/ptrace_scope, or try again as the root user. For more details, see /etc/sysctl.d/10-ptrace.conf ptrace: Operation not permitted. ================================================================= Got a SIGSEGV while executing native code. This usually indicates a fatal error in the mono runtime or one of the native libraries used by your application. Aborted It is a huge problem with mono or f#? By the way, the same function works when using pattern matching instead of "if".

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• What is the best Battleship AI?

  - by John Gietzen

  Battleship! Back in 2003, (when I was 17,) I competed in a Battleship AI coding competition. Even though I lost that tournament, I had a lot of fun and learned a lot from it. Now, I would like to resurrect this competition, in the search of the best battleship AI. Here is the framework: Battleship.zip The winner will be awarded +450 reputation! The competition will be held starting on the 17th of November, 2009. No entries or edits later than zero-hour on the 17th will be accepted. (Central Standard Time) Submit your entries early, so you don't miss your opportunity! To keep this OBJECTIVE, please follow the spirit of the competition. Rules of the game: The game is be played on a 10x10 grid. Each competitor will place each of 5 ships (of lengths 2, 3, 3, 4, 5) on their grid. No ships may overlap, but they may be adjacent. The competitors then take turns firing single shots at their opponent. A variation on the game allows firing multiple shots per volley, one for each surviving ship. The opponent will notify the competitor if the shot sinks, hits, or misses. Game play ends when all of the ships of any one player are sunk. Rules of the competition: The spirit of the competition is to find the best Battleship algorithm. Anything that is deemed against the spirit of the competition will be grounds for disqualification. Interfering with an opponent is against the spirit of the competition. Multithreading may be used under the following restrictions: No more than one thread may be running while it is not your turn. (Though, any number of threads may be in a "Suspended" state). No thread may run at a priority other than "Normal". Given the above two restrictions, you will be guaranteed at least 3 dedicated CPU cores during your turn. A limit of 1 second of CPU time per game is allotted to each competitor on the primary thread. Running out of time results in losing the current game. Any unhandled exception will result in losing the current game. Network access and disk access is allowed, but you may find the time restrictions fairly prohibitive. However, a few set-up and tear-down methods have been added to alleviate the time strain. Code should be posted on stack overflow as an answer, or, if too large, linked. Max total size (un-compressed) of an entry is 1 MB. Officially, .Net 2.0 / 3.5 is the only framework requirement. Your entry must implement the IBattleshipOpponent interface. Scoring: Best 51 games out of 101 games is the winner of a match. All competitors will play matched against each other, round-robin style. The best half of the competitors will then play a double-elimination tournament to determine the winner. (Smallest power of two that is greater than or equal to half, actually.) I will be using the TournamentApi framework for the tournament. The results will be posted here. If you submit more than one entry, only your best-scoring entry is eligible for the double-elim. Good luck! Have fun! EDIT 1: Thanks to Freed, who has found an error in the Ship.IsValid function. It has been fixed. Please download the updated version of the framework. EDIT 2: Since there has been significant interest in persisting stats to disk and such, I have added a few non-timed set-up and tear-down events that should provide the required functionality. This is a semi-breaking change. That is to say: the interface has been modified to add functions, but no body is required for them. Please download the updated version of the framework. EDIT 3: Bug Fix 1: GameWon and GameLost were only getting called in the case of a time out. Bug Fix 2: If an engine was timing out every game, the competition would never end. Please download the updated version of the framework. EDIT 4: Results!

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• COMException when trying to use a Library

  - by sarkie

  Hi Guys, I have an ASP.net WebService which uses a Library, this has a dependency on some third party .dlls. If I add a reference to the Library to my webservice, I get a COMException and I can't load the site. I thought it may be to do with aspnet user credentials, so I have tried impersonating and using processModel in machine.config but nothing seems to work. The .dlls are for communicating with hardware so I am not even using them on the server just other parts of the library, is there any way I can fix this? I'm running on Windows XP Pro SP3 with Visual 2008 SP1 and .net 3.5. I am thinking the only way of fixing it, is to split up the library into hardware and non-hardware based. Cheers, Sarkie The specified procedure could not be found. (Exception from HRESULT: 0x8007007F) Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code. Exception Details: System.Runtime.InteropServices.COMException: The specified procedure could not be found. (Exception from HRESULT: 0x8007007F) Source Error: An unhandled exception was generated during the execution of the current web request. Information regarding the origin and location of the exception can be identified using the exception stack trace below. Stack Trace: [COMException (0x8007007f): The specified procedure could not be found. (Exception from HRESULT: 0x8007007F)] [FileLoadException: A procedure imported by 'OBIDISC4NETnative, Version=0.0.0.0, Culture=neutral, PublicKeyToken=900ed37a7058e4f2' could not be loaded.] System.Reflection.Assembly._nLoad(AssemblyName fileName, String codeBase, Evidence assemblySecurity, Assembly locationHint, StackCrawlMark& stackMark, Boolean throwOnFileNotFound, Boolean forIntrospection) +0 System.Reflection.Assembly.nLoad(AssemblyName fileName, String codeBase, Evidence assemblySecurity, Assembly locationHint, StackCrawlMark& stackMark, Boolean throwOnFileNotFound, Boolean forIntrospection) +43 System.Reflection.Assembly.InternalLoad(AssemblyName assemblyRef, Evidence assemblySecurity, StackCrawlMark& stackMark, Boolean forIntrospection) +127 System.Reflection.Assembly.InternalLoad(String assemblyString, Evidence assemblySecurity, StackCrawlMark& stackMark, Boolean forIntrospection) +142 System.Reflection.Assembly.Load(String assemblyString) +28 System.Web.Configuration.CompilationSection.LoadAssemblyHelper(String assemblyName, Boolean starDirective) +46 [ConfigurationErrorsException: A procedure imported by 'OBIDISC4NETnative, Version=0.0.0.0, Culture=neutral, PublicKeyToken=900ed37a7058e4f2' could not be loaded.] System.Web.Configuration.CompilationSection.LoadAssemblyHelper(String assemblyName, Boolean starDirective) +613 System.Web.Configuration.CompilationSection.LoadAllAssembliesFromAppDomainBinDirectory() +203 System.Web.Configuration.CompilationSection.LoadAssembly(AssemblyInfo ai) +105 System.Web.Compilation.BuildManager.GetReferencedAssemblies(CompilationSection compConfig) +178 System.Web.Compilation.WebDirectoryBatchCompiler..ctor(VirtualDirectory vdir) +163 System.Web.Compilation.BuildManager.BatchCompileWebDirectoryInternal(VirtualDirectory vdir, Boolean ignoreErrors) +53 System.Web.Compilation.BuildManager.BatchCompileWebDirectory(VirtualDirectory vdir, VirtualPath virtualDir, Boolean ignoreErrors) +175 System.Web.Compilation.BuildManager.CompileWebFile(VirtualPath virtualPath) +83 System.Web.Compilation.BuildManager.GetVPathBuildResultInternal(VirtualPath virtualPath, Boolean noBuild, Boolean allowCrossApp, Boolean allowBuildInPrecompile) +261 System.Web.Compilation.BuildManager.GetVPathBuildResultWithNoAssert(HttpContext context, VirtualPath virtualPath, Boolean noBuild, Boolean allowCrossApp, Boolean allowBuildInPrecompile) +101 System.Web.Compilation.BuildManager.GetVPathBuildResult(HttpContext context, VirtualPath virtualPath, Boolean noBuild, Boolean allowCrossApp, Boolean allowBuildInPrecompile) +83 System.Web.Compilation.BuildManager.GetVPathBuildResult(HttpContext context, VirtualPath virtualPath) +10 System.Web.UI.WebServiceParser.GetCompiledType(String inputFile, HttpContext context) +43 System.Web.Services.Protocols.WebServiceHandlerFactory.GetHandler(HttpContext context, String verb, String url, String filePath) +180 System.Web.Script.Services.ScriptHandlerFactory.GetHandler(HttpContext context, String requestType, String url, String pathTranslated) +102 System.Web.HttpApplication.MapHttpHandler(HttpContext context, String requestType, VirtualPath path, String pathTranslated, Boolean useAppConfig) +193 System.Web.MapHandlerExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute() +93 System.Web.HttpApplication.ExecuteStep(IExecutionStep step, Boolean& completedSynchronously) +155 -------------------------------------------------------------------------------- Version Information: Microsoft .NET Framework Version:2.0.50727.3082; ASP.NET Version:2.0.50727.3082

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• C++ custom exceptions: run time performance and passing exceptions from C++ to C

  - by skyeagle

  I am writing a custom C++ exception class (so I can pass exceptions occuring in C++ to another language via a C API). My initial plan of attack was to proceed as follows: //C++ myClass { public: myClass(); ~myClass(); void foo() // throws myException int foo(const int i, const bool b) // throws myException } * myClassPtr; // C API #ifdef __cplusplus extern "C" { #endif myClassPtr MyClass_New(); void MyClass_Destroy(myClassPtr p); void MyClass_Foo(myClassPtr p); int MyClass_FooBar(myClassPtr p, int i, bool b); #ifdef __cplusplus }; #endif I need a way to be able to pass exceptions thrown in the C++ code to the C side. The information I want to pass to the C side is the following: (a). What (b). Where (c). Simple Stack Trace (just the sequence of error messages in order they occured, no debugging info etc) I want to modify my C API, so that the API functions take a pointer to a struct ExceptionInfo, which will contain any exception info (if an exception occured) before consuming the results of the invocation. This raises two questions: Question 1 1. Implementation of each of the C++ methods exposed in the C API needs to be enclosed in a try/catch statement. The performance implications for this seem quite serious (according to this article): "It is a mistake (with high runtime cost) to use C++ exception handling for events that occur frequently, or for events that are handled near the point of detection." At the same time, I remember reading somewhere in my C++ days, that all though exception handling is expensive, it only becmes expensive when an exception actually occurs. So, which is correct?. what to do?. Is there an alternative way that I can trap errors safely and pass the resulting error info to the C API?. Or is this a minor consideration (the article after all, is quite old, and hardware have improved a bit since then). Question 2 I wuld like to modify the exception class given in that article, so that it contains a simple stack trace, and I need some help doing that. Again, in order to make the exception class 'lightweight', I think its a good idea not to include any STL classes, like string or vector (good idea/bad idea?). Which potentially leaves me with a fixed length C string (char*) which will be stack allocated. So I can maybe just keep appending messages (delimted by a unique separator [up to maximum length of buffer])... Its been a while since I did any serious C++ coding, and I will be grateful for the help. BTW, this is what I have come up with so far (I am intentionally, not deriving from std::exception because of the performance reasons mentioned in the article, and I am instead, throwing an integral exception (based on an exception enumeration): class fast_exception { public: fast_exception(int what, char const* file=0, int line=0) : what_(what), line_(line), file_(file) {/*empty*/} int what() const { return what_; } int line() const { return line_; } char const* file() const { return file_; } private: int what_; int line_; char const[MAX_BUFFER_SIZE] file_; }

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• ASP.net FFMPEG video conversion receiving error: "Error number -2 occurred"

  - by Pete

  Hello, I am attempting to integrate FFMPEG into my asp.net website. The process I am trying to complete is to upload a video, check if it is .avi, .mov, or .wmv and then convert this video into an mp4 using x264 so my flash player can play it. I am using an http handler (ashx) file to handle my upload. This is where I am also putting my conversion code. I am not sure if this is the best place to put it, but I wanted to see if i could at least get it working. Additionally, I was able to complete the conversion manually through cmd line. The error -2 comes up when i output the standard error from the process I executed. This is the error i receive: FFmpeg version SVN-r23001, Copyright (c) 2000-2010 the FFmpeg developers built on May 1 2010 06:06:15 with gcc 4.4.2 configuration: --enable-memalign-hack --cross-prefix=i686-mingw32- --cc=ccache-i686-mingw32-gcc --arch=i686 --target-os=mingw32 --enable-runtime-cpudetect --enable-avisynth --enable-gpl --enable-version3 --enable-bzlib --enable-libgsm --enable-libfaad --enable-pthreads --enable-libvorbis --enable-libtheora --enable-libspeex --enable-libmp3lame --enable-libopenjpeg --enable-libxvid --enable-libschroedinger --enable-libx264 --enable-libopencore_amrwb --enable-libopencore_amrnb libavutil 50.15. 0 / 50.15. 0 libavcodec 52.66. 0 / 52.66. 0 libavformat 52.61. 0 / 52.61. 0 libavdevice 52. 2. 0 / 52. 2. 0 libswscale 0.10. 0 / 0.10. 0 532010_Robotica_720.wmv: Error number -2 occurred here is the code below: <%@ WebHandler Language="VB" Class="upload" %> Imports System Imports System.Web Imports System.IO Imports System.Diagnostics Imports System.Threading Public Class upload : Implements IHttpHandler Public currentTime As System.DateTime Public Sub ProcessRequest(ByVal context As HttpContext) Implements IHttpHandler.ProcessRequest currentTime = System.DateTime.Now If (Not context.Request.Files("Filedata") Is Nothing) Then Dim file As HttpPostedFile : file = context.Request.Files("Filedata") Dim targetDirectory As String : targetDirectory = HttpContext.Current.Server.MapPath(context.Request("folder")) Dim targetFilePath As String : targetFilePath = Path.Combine(targetDirectory, currentTime.Month & currentTime.Day & currentTime.Year & "_" & file.FileName) Dim fileNameArray As String() fileNameArray = Split(file.FileName, ".") If (System.IO.File.Exists(targetFilePath)) Then System.IO.File.Delete(targetFilePath) End If file.SaveAs(targetFilePath) Select Case fileNameArray(UBound(fileNameArray)) Case "avi", "mov", "wmv" Dim fileargs As String = fileargs = "-y -i " & currentTime.Month & currentTime.Day & currentTime.Year & "_" & file.FileName & " -ab 96k -vcodec libx264 -vpre normal -level 41 " fileargs += "-crf 25 -bufsize 20000k -maxrate 25000k -g 250 -r 20 -s 900x506 -coder 1 -flags +loop " fileargs += "-cmp +chroma -partitions +parti4x4+partp8x8+partb8x8 -subq 7 -me_range 16 -keyint_min 25 " fileargs += "-sc_threshold 40 -i_qfactor 0.71 -rc_eq 'blurCplx^(1-qComp)' -bf 16 -b_strategy 1 -bidir_refine 1 " fileargs += "-refs 6 -deblockalpha 0 -deblockbeta 0 -f mp4 " & currentTime.Month & currentTime.Day & currentTime.Year & "_" & file.FileName & ".mp4" Dim proc As New Diagnostics.Process() proc.StartInfo.FileName "ffmpeg.exe" proc.StartInfo.Arguments = fileargs proc.StartInfo.UseShellExecute = False proc.StartInfo.CreateNoWindow = True proc.StartInfo.RedirectStandardOutput = True proc.StartInfo.RedirectStandardError = True AddHandler proc.OutputDataReceived, AddressOf SaveTextToFile proc.Start() SaveTextToFile2(proc.StandardError.ReadToEnd()) proc.WaitForExit() proc.Close() End Select Catch ex As System.IO.IOException Thread.Sleep(2000) GoTo Conversion Finally context.Response.Write("1") End Try End If End Sub Public ReadOnly Property IsReusable() As Boolean Implements IHttpHandler.IsReusable Get Return False End Get End Property Private Shared Sub SaveTextToFile(ByVal sendingProcess As Object, ByVal strData As DataReceivedEventArgs) Dim FullPath As String = "text.txt" Dim Contents As String = "" Dim objReader As StreamWriter objReader = New StreamWriter(FullPath) If Not String.IsNullOrEmpty(strData.Data) Then objReader.Write(Environment.NewLine + strData.Data) End If objReader.Close() End Sub Private Sub SaveTextToFile2(ByVal strData As String) Dim FullPath As String = "texterror.txt" Dim Contents As String = "" Dim objReader As StreamWriter objReader = New StreamWriter(FullPath) objReader.Write(Environment.NewLine + strData) objReader.Close() End Sub End Class

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• MXMLC Ant task results in java.lang.OutOFMemoryError

  - by Mims H. Wright

  I'm making a change to a set of code for a Flex project that I didn't write and was set up to compile using ant tasks. I assume that the codebase was stable at the last checkin but I'm running into memory issues when trying to build a project using MXMLC and ant (see stack trace below). Before, I was just getting an out of memory error. I tried using a different machine and got this more verbose exception (including problems with the image fetcher). I've tried using various versions of the SDK, I've tried replacing the <mxmlc> tag with <exec executable="mxmlc"> with no luck. Here is my java version in case that has anything to do with it: » java -version java version "1.6.0_20" Java(TM) SE Runtime Environment (build 1.6.0_20-b02-279-10M3065) Java HotSpot(TM) 64-Bit Server VM (build 16.3-b01-279, mixed mode) Any help would be appreciated. Thanks! Buildfile: build.xml compileSWF: [echo] Compiling main.swf... [mxmlc] Loading configuration file /Applications/Adobe Flash Builder 4 Plug-in/sdks/4.0.0beta2/frameworks/flex-config.xml [mxmlc] Exception in thread "Image Fetcher 0" java.lang.OutOfMemoryError: Java heap space [mxmlc] at java.awt.image.PixelGrabber.setDimensions(PixelGrabber.java:360) [mxmlc] at sun.awt.image.ImageDecoder.setDimensions(ImageDecoder.java:62) [mxmlc] at sun.awt.image.JPEGImageDecoder.sendHeaderInfo(JPEGImageDecoder.java:71) [mxmlc] at sun.awt.image.JPEGImageDecoder.readImage(Native Method) [mxmlc] at sun.awt.image.JPEGImageDecoder.produceImage(JPEGImageDecoder.java:119) [mxmlc] at sun.awt.image.InputStreamImageSource.doFetch(InputStreamImageSource.java:246) [mxmlc] at sun.awt.image.ImageFetcher.fetchloop(ImageFetcher.java:172) [mxmlc] at sun.awt.image.ImageFetcher.run(ImageFetcher.java:136) [mxmlc] /src/com/amtrak/components/map/MapAsset.mxml: Error: exception during transcoding: Failed to grab pixels for image /src/assets/embed_assets/images/zoomed_map_wide.jpg [mxmlc] [mxmlc] /src/com/amtrak/components/map/MapAsset.mxml: Error: Unable to transcode /assets/embed_assets/images/zoomed_map_wide.jpg. [mxmlc] [mxmlc] Error: Java heap space [mxmlc] [mxmlc] java.lang.OutOfMemoryError: Java heap space [mxmlc] at java.util.ArrayList.<init>(ArrayList.java:112) [mxmlc] at macromedia.asc.util.ObjectList.<init>(ObjectList.java:30) [mxmlc] at macromedia.asc.parser.ArgumentListNode.<init>(ArgumentListNode.java:30) [mxmlc] at macromedia.asc.parser.NodeFactory.argumentList(NodeFactory.java:116) [mxmlc] at macromedia.asc.parser.NodeFactory.argumentList(NodeFactory.java:97) [mxmlc] at flex2.compiler.mxml.ImplementationGenerator.generateBinding(ImplementationGenerator.java:563) [mxmlc] at flex2.compiler.mxml.ImplementationGenerator.generateBindingsSetupFunction(ImplementationGenerator.java:864) [mxmlc] at flex2.compiler.mxml.ImplementationGenerator.generateBindingsSetup(ImplementationGenerator.java:813) [mxmlc] at flex2.compiler.mxml.ImplementationGenerator.generateInitializerSupportDefs(ImplementationGenerator.java:1813) [mxmlc] at flex2.compiler.mxml.ImplementationGenerator.generateClassDefinition(ImplementationGenerator.java:1005) [mxmlc] at flex2.compiler.mxml.ImplementationGenerator.<init>(ImplementationGenerator.java:201) [mxmlc] at flex2.compiler.mxml.ImplementationCompiler.generateImplementationAST(ImplementationCompiler.java:498) [mxmlc] at flex2.compiler.mxml.ImplementationCompiler.parse1(ImplementationCompiler.java:196) [mxmlc] at flex2.compiler.mxml.MxmlCompiler.parse1(MxmlCompiler.java:168) [mxmlc] at flex2.compiler.CompilerAPI.parse1(CompilerAPI.java:2851) [mxmlc] at flex2.compiler.CompilerAPI.parse1(CompilerAPI.java:2804) [mxmlc] at flex2.compiler.CompilerAPI.batch2(CompilerAPI.java:446) [mxmlc] at flex2.compiler.CompilerAPI.batch(CompilerAPI.java:1274) [mxmlc] at flex2.compiler.CompilerAPI.compile(CompilerAPI.java:1488) [mxmlc] at flex2.compiler.CompilerAPI.compile(CompilerAPI.java:1375) [mxmlc] at flex2.tools.Mxmlc.mxmlc(Mxmlc.java:282) [mxmlc] at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) [mxmlc] at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39) [mxmlc] at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25) [mxmlc] at java.lang.reflect.Method.invoke(Method.java:597) [mxmlc] at flex.ant.FlexTask.executeInProcess(FlexTask.java:280) [mxmlc] at flex.ant.FlexTask.execute(FlexTask.java:225) [mxmlc] at org.apache.tools.ant.UnknownElement.execute(UnknownElement.java:288) [mxmlc] at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) [mxmlc] at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39) [mxmlc] at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25) [mxmlc] at java.lang.reflect.Method.invoke(Method.java:597) BUILD FAILED /src/build.xml:49: mxmlc task failed

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• Calling Grep inside Java gives incorrect results when calling grep in shell gives correct results.

  - by futureelite7

  I've got a problem where calling grep from inside java gives incorrect results, as compared to the results from calling grep on the same file in the shell. My grep command (called both in Java and in bash. I escaped the slash in Java accordingly): /bin/grep -vP --regexp='^[0-9]+\t.*' /usr/local/apache-tomcat-6.0.18/work/Catalina/localhost/saccitic/237482319867147879_1271411421 The command is supposed to match and discard strings like these: 85295371616 Hi Mr Lee, please be informed that... My input file is this: 85aaa234567 Hi Ms Chan, please be informed that... 85292vx5678 Hi Mrs Ng, please be informed that... 85295371616 Hi Mr Lee, please be informed that... 85aaa234567 Hi Ms Chan, please be informed that... 85292vx5678 Hi Mrs Ng, please be informed that... 85295371616 Hi Mr Lee, please be informed that... 85295371616 Hi Mr Lee, please be informed that... 85295371616 Hi Mr Lee, please be informed that... 85295371616 Hi Mr Lee, please be informed that... 85295371616 Hi Mr Lee, please be informed that... 8~!95371616 Hi Mr Lee, please be informed that... 85295371616 Hi Mr Lee, please be informed that... 852&^*&1616 Hi Mr Lee, please be informed that... 8529537Ax16 Hi Mr Lee, please be informed that... 85====ppq16 Hi Mr Lee, please be informed that... 85291234783 a3283784428349247233834728482984723333 85219299222 The commands works when I call it from inside bash (Results below): 85aaa234567 Hi Ms Chan, please be informed that... 85292vx5678 Hi Mrs Ng, please be informed that... 85aaa234567 Hi Ms Chan, please be informed that... 85292vx5678 Hi Mrs Ng, please be informed that... 8~!95371616 Hi Mr Lee, please be informed that... 852&^*&1616 Hi Mr Lee, please be informed that... 8529537Ax16 Hi Mr Lee, please be informed that... 85====ppq16 Hi Mr Lee, please be informed that... 85219299222 However, when I call grep again inside java, I get the entire file (Results below): 85aaa234567 Hi Ms Chan, please be informed that... 85292vx5678 Hi Mrs Ng, please be informed that... 85295371616 Hi Mr Lee, please be informed that... 85aaa234567 Hi Ms Chan, please be informed that... 85292vx5678 Hi Mrs Ng, please be informed that... 85295371616 Hi Mr Lee, please be informed that... 85295371616 Hi Mr Lee, please be informed that... 85295371616 Hi Mr Lee, please be informed that... 85295371616 Hi Mr Lee, please be informed that... 85295371616 Hi Mr Lee, please be informed that... 8~!95371616 Hi Mr Lee, please be informed that... 85295371616 Hi Mr Lee, please be informed that... 852&^*&1616 Hi Mr Lee, please be informed that... 8529537Ax16 Hi Mr Lee, please be informed that... 85====ppq16 Hi Mr Lee, please be informed that... 85291234783 a3283784428349247233834728482984723333 85219299222 What could be the problem that will cause the grep called by Java to return incorrect results? I tried passing local information via the environment string array in runtime.exec, but nothing seems to change. Am I passing in the locale information incorrectly, or is the problem something else entirely? private String[] localeArray = new String[] { "LANG=", "LC_COLLATE=C", "LC_CTYPE=UTF-8", "LC_MESSAGES=C", "LC_MONETARY=C", "LC_NUMERIC=C", "LC_TIME=C", "LC_ALL=" };

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• Calling Grep inside Java gives incorrect results while calling grep in shell gives correct results.

  - by futureelite7

  I've got a problem where calling grep from inside java gives incorrect results, as compared to the results from calling grep on the same file in the shell. My grep command (called both in Java and in bash. I escaped the slash in Java accordingly): /bin/grep -vP --regexp='^[0-9]+\t.*' /usr/local/apache-tomcat-6.0.18/work/Catalina/localhost/saccitic/237482319867147879_1271411421 Java Code: String filepath = "/path/to/file"; String options = "P"; String grepparams = "^[0-9]+\\t.*"; String greppath = "/bin/"; String[] localeArray = new String[] { "LANG=", "LC_COLLATE=C", "LC_CTYPE=UTF-8", "LC_MESSAGES=C", "LC_MONETARY=C", "LC_NUMERIC=C", "LC_TIME=C", "LC_ALL=" }; options = "v"+options; //Assign optional params if (options.contains("P")) { grepparams = "\'"+grepparams+"\'"; //Quote the regex expression if -P flag is used } else { options = "E"+options; //equivalent to calling egrep } proc = sysRuntime.exec(greppath+"/grep -"+options+" --regexp="+grepparams+" "+filepath, localeArray); System.out.println(greppath+"/grep -"+options+" --regexp="+grepparams+" "+filepath); inStream = proc.getInputStream(); The command is supposed to match and discard strings like these: 85295371616 Hi Mr Lee, please be informed that... My input file is this: 85aaa234567 Hi Ms Chan, please be informed that... 85292vx5678 Hi Mrs Ng, please be informed that... 85295371616 Hi Mr Lee, please be informed that... 85aaa234567 Hi Ms Chan, please be informed that... 85292vx5678 Hi Mrs Ng, please be informed that... 85295371616 Hi Mr Lee, please be informed that... 85295371616 Hi Mr Lee, please be informed that... 85295371616 Hi Mr Lee, please be informed that... 85295371616 Hi Mr Lee, please be informed that... 85295371616 Hi Mr Lee, please be informed that... 8~!95371616 Hi Mr Lee, please be informed that... 85295371616 Hi Mr Lee, please be informed that... 852&^*&1616 Hi Mr Lee, please be informed that... 8529537Ax16 Hi Mr Lee, please be informed that... 85====ppq16 Hi Mr Lee, please be informed that... 85291234783 a3283784428349247233834728482984723333 85219299222 The commands works when I call it from inside bash (Results below): 85aaa234567 Hi Ms Chan, please be informed that... 85292vx5678 Hi Mrs Ng, please be informed that... 85aaa234567 Hi Ms Chan, please be informed that... 85292vx5678 Hi Mrs Ng, please be informed that... 8~!95371616 Hi Mr Lee, please be informed that... 852&^*&1616 Hi Mr Lee, please be informed that... 8529537Ax16 Hi Mr Lee, please be informed that... 85====ppq16 Hi Mr Lee, please be informed that... 85219299222 However, when I call grep again inside java, I get the entire file (Results below): 85aaa234567 Hi Ms Chan, please be informed that... 85292vx5678 Hi Mrs Ng, please be informed that... 85295371616 Hi Mr Lee, please be informed that... 85aaa234567 Hi Ms Chan, please be informed that... 85292vx5678 Hi Mrs Ng, please be informed that... 85295371616 Hi Mr Lee, please be informed that... 85295371616 Hi Mr Lee, please be informed that... 85295371616 Hi Mr Lee, please be informed that... 85295371616 Hi Mr Lee, please be informed that... 85295371616 Hi Mr Lee, please be informed that... 8~!95371616 Hi Mr Lee, please be informed that... 85295371616 Hi Mr Lee, please be informed that... 852&^*&1616 Hi Mr Lee, please be informed that... 8529537Ax16 Hi Mr Lee, please be informed that... 85====ppq16 Hi Mr Lee, please be informed that... 85291234783 a3283784428349247233834728482984723333 85219299222 What could be the problem that will cause the grep called by Java to return incorrect results? I tried passing local information via the environment string array in runtime.exec, but nothing seems to change. Am I passing in the locale information incorrectly, or is the problem something else entirely?

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• rubygem Twitter4R Issues

  - by Leonardo Dario Perna

  Hi everyone, I'm trying to get started with twitter4r but I'm having some issues: Why I can't load the gem in IRB? $ sudo gem install twitter4r Successfully installed twitter4r-0.3.2 1 gem installed Installing ri documentation for twitter4r-0.3.2... Installing RDoc documentation for twitter4r-0.3.2... $ irb require 'rubygems' = false require 'twitter4r' LoadError: no such file to load -- twitter4r from /Library/Ruby/Site/1.8/rubygems/custom_require.rb:31:in `gem_original_require' from /Library/Ruby/Site/1.8/rubygems/custom_require.rb:31:in `require' from (irb):2 I've downloaded the http://files.rubyforge.vm.bytemark.co.uk/twitter4r/twitter4rails.post-0_2_4.zip app and it works only with twitter4r-0.2.4 and NOT with last version twitter4r-0.3.2: $ script/server ./script/../config/boot.rb:26:Warning: Gem::SourceIndex#search support for String patterns is deprecated, use #find_name = Booting Mongrel (use 'script/server webrick' to force WEBrick) = Rails application starting on http://0.0.0.0:3000 = Call with -d to detach = Ctrl-C to shutdown server ** Starting Mongrel listening at 0.0.0.0:3000 ** Starting Rails with development environment... Exiting /Library/Ruby/Site/1.8/rubygems/custom_require.rb:31:in `gem_original_require': no such file to load -- twitter/rails (MissingSourceFile) from /Library/Ruby/Site/1.8/rubygems/custom_require.rb:31:in `require' from /System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/lib/ ruby/gems/1.8/gems/activesupport-1.4.2/lib/active_support/ dependencies.rb:495:in `require' from /System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/lib/ ruby/gems/1.8/gems/activesupport-1.4.2/lib/active_support/ dependencies.rb:342:in `new_constants_in' from /System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/lib/ ruby/gems/1.8/gems/activesupport-1.4.2/lib/active_support/ dependencies.rb:495:in `require' from /Users/leonardodarioperna/Projects/Kaaaki/marrakaaaki/ twitter4rails.post-0_2_4/config/environment.rb:64 from /Library/Ruby/Site/1.8/rubygems/custom_require.rb:31:in `gem_original_require' from /Library/Ruby/Site/1.8/rubygems/custom_require.rb:31:in `require' from /System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/lib/ ruby/gems/1.8/gems/activesupport-1.4.2/lib/active_support/ dependencies.rb:495:in `require' ... 23 levels... from /System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/lib/ ruby/gems/1.8/gems/rails-1.2.3/lib/commands/server.rb:39 from /Library/Ruby/Site/1.8/rubygems/custom_require.rb:31:in `gem_original_require' from /Library/Ruby/Site/1.8/rubygems/custom_require.rb:31:in `require' from script/server:3 Last thing, in the /config/environment.rb I need to specify: RAILS_GEM_VERSION = '1.2.3' unless defined? RAILS_GEM_VERSION if I use my last rails version: RAILS_GEM_VERSION = '2.3.4' unless defined? RAILS_GEM_VERSION I get this error: $ script/server -p3002 = Booting Mongrel = Rails 2.3.4 application starting on http://0.0.0.0:3000 /Library/Ruby/Site/1.8/rubygems.rb:280:in `activate': can't activate activerecord (= 1.15.6, runtime) for [], already activated activerecord-2.3.4 for ["rails-2.3.4"] (Gem::LoadError) from /Library/Ruby/Site/1.8/rubygems/custom_require.rb:35:in `require' from /Library/Ruby/Gems/1.8/gems/activesupport-2.3.4/lib/ active_support/dependencies.rb:156:in `require' from /Library/Ruby/Gems/1.8/gems/activesupport-2.3.4/lib/ active_support/dependencies.rb:521:in `new_constants_in' from /Library/Ruby/Gems/1.8/gems/activesupport-2.3.4/lib/ active_support/dependencies.rb:156:in `require' from /Library/Ruby/Gems/1.8/gems/twitter4r-0.2.4/lib/twitter/rails.rb: 6 from /Library/Ruby/Site/1.8/rubygems/custom_require.rb:31:in `gem_original_require' from /Library/Ruby/Site/1.8/rubygems/custom_require.rb:31:in `require' from /Library/Ruby/Gems/1.8/gems/activesupport-2.3.4/lib/ active_support/dependencies.rb:156:in `require' ... 8 levels... from /Library/Ruby/Gems/1.8/gems/rails-2.3.4/lib/commands/server.rb: 84 from /Library/Ruby/Site/1.8/rubygems/custom_require.rb:31:in `gem_original_require' from /Library/Ruby/Site/1.8/rubygems/custom_require.rb:31:in `require' from script/server:3 And that's all :-) Thank you!

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• Question about how to use strong typed dataset in N-tier application for .NET

  - by sb

  Hello All, I need some expert advice on strong typed data sets in ADO.NET that are generated by the Visual Studio. Here are the details. Thank you in advance. I want to write a N-tier application where Presentation layer is in C#/windows forms, Business Layer is a Web service and Data Access Layer is SQL db. So, I used Visual Studio 2005 for this and created 3 projects in a solution. project 1 is the Data access layer. In this I have used visual studio data set generator to create a strong typed data set and table adapter (to test I created this on the customers table in northwind). The data set is called NorthWindDataSet and the table inside is CustomersTable. project 2 has the web service which exposes only 1 method which is GetCustomersDataSet. This uses the project1 library's table adapter to fill the data set and return it to the caller. To be able to use the NorthWindDataSet and table adapter, I added a reference to the project 1. project 3 is a win forms app and this uses the web service as a reference and calls that service to get the data set. In the process of building this application, in the PL, I added a reference to the DataSet generated above in the project 1 and in form's load I call the web service and assign the received DataSet from the web service to this dataset. But I get the error: "Cannot implicitly convert type 'PL.WebServiceLayerReference.NorthwindDataSet' to 'BL.NorthwindDataSet' e:\My Documents\Visual Studio 2008\Projects\DataSetWebServiceExample\PL\Form1.cs". Both the data sets are same but because I added references from different locations, I am getting the above error I think. So, what I did was I added a reference to project 1 (which defines the data set) to project 3 (the UI) and used the web service to get the DataSet and assing to the right type, now when the project 3 (which has the web form) runs, I get the below runtime exception. "System.InvalidOperationException: There is an error in XML document (1, 5058). --- System.Xml.Schema.XmlSchemaException: Multiple definition of element 'http://tempuri.org/NorthwindDataSet.xsd:Customers' causes the content model to become ambiguous. A content model must be formed such that during validation of an element information item sequence, the particle contained directly, indirectly or implicitly therein with which to attempt to validate each item in the sequence in turn can be uniquely determined without examining the content or attributes of that item, and without any information about the items in the remainder of the sequence." I think this might be because of some cross referenceing errors. My question is, is there a way to use the visual studio generated DataSets in such a way that I can use the same DataSet in all layers (for reuse) but separate the Table Adapter logic to the Data Access Layer so that the front end is abstracted from all this by the web service? If I have hand write the code I loose the goodness the data set generator gives and also if there are columns added later I need to add it by hand etc so I want to use the visual studio wizard as much as possible. thanks for any help on this. sb

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• How do I use MediaRecorder to record video without causing a segmentation fault?

  - by rabidsnail

  I'm trying to use android.media.MediaRecorder to record video, and no matter what I do the android runtime segmentation faults when I call prepare(). Here's an example: public void onCreate(Bundle savedInstanceState) { Log.i("video test", "making recorder"); MediaRecorder recorder = new MediaRecorder(); contentResolver = getContentResolver(); try { super.onCreate(savedInstanceState); Log.i("video test", "--------------START----------------"); SurfaceView target_view = new SurfaceView(this); Log.i("video test", "making surface"); Surface target = target_view.getHolder().getSurface(); Log.i("video test", target.toString()); Log.i("video test", "new recorder"); recorder = new MediaRecorder(); Log.i("video test", "set display"); recorder.setPreviewDisplay(target); Log.i("video test", "pushing surface"); setContentView(target_view); Log.i("video test", "set audio source"); recorder.setAudioSource(MediaRecorder.AudioSource.MIC); Log.i("video test", "set video source"); recorder.setVideoSource(MediaRecorder.VideoSource.DEFAULT); Log.i("video test", "set output format"); recorder.setOutputFormat(MediaRecorder.OutputFormat.THREE_GPP); Log.i("video test", "set audio encoder"); recorder.setAudioEncoder(MediaRecorder.AudioEncoder.AMR_NB); Log.i("video test", "set video encoder"); recorder.setVideoEncoder(MediaRecorder.VideoEncoder.MPEG_4_SP); Log.i("video test", "set max duration"); recorder.setMaxDuration(3600); Log.i("video test", "set on info listener"); recorder.setOnInfoListener(new listener()); Log.i("video test", "set video size"); recorder.setVideoSize(320, 240); Log.i("video test", "set video frame rate"); recorder.setVideoFrameRate(15); Log.i("video test", "set output file"); recorder.setOutputFile(get_path(this, "foo.3gp")); Log.i("video test", "prepare"); recorder.prepare(); Log.i("video test", "start"); recorder.start(); Log.i("video test", "sleep"); Thread.sleep(3600); Log.i("video test", "stop"); recorder.stop(); Log.i("video test", "release"); recorder.release(); Log.i("video test", "-----------------SUCCESS------------------"); finish(); } catch (Exception e) { Log.i("video test", e.toString()); recorder.reset(); recorder.release(); Log.i("video tets", "-------------------FAIL-------------------"); finish(); } } public static String get_path (Context context, String fname) { String path = context.getFileStreamPath("foo").getParentFile().getAbsolutePath(); String res = path+"/"+fname; Log.i("video test", "path: "+res); return res; } class listener implements MediaRecorder.OnInfoListener { public void onInfo(MediaRecorder recorder, int what, int extra) { Log.i("video test", "Video Info: "+what+", "+extra); } }

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