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• Using HTTP status codes to reflect success/failure of Web service request?

  - by jgarbers

  I'm implementing a Web service that returns a JSON-encoded payload. If the service call fails -- say, due to invalid parameters -- a JSON-encoded error is returned. I'm unsure, however, what HTTP status code should be returned in that situation. On one hand, it seems like HTTP status codes are for HTTP: even though an application error is being returned, the HTTP transfer itself was successful, suggesting a 200 OK response. On the other hand, a RESTful approach would seem to suggest that if the caller is attempting to post to a resource, and the JSON parameters of the request are invalid somehow, that a 400 Bad Request is appropriate. I'm using Prototype on the client side, which has a nice mechanism for automatically dispatching to different callbacks based on HTTP status code (onSuccess and onFailure), so I'm tempted to use status codes to indicate service success or failure, but I'd be interested to hear if anyone has opinions or experience with common practice in this matter. Thanks!

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• GKPeerStateAvailable for non existing peers?

  - by Ernest

  Hi, used this website for the long time to find answers, now need to ask on myself! :) I have implemented multi player for my game using GKSession and client/server approach, not using peer picker (up to 4 player allowed). I have one big problem which I can't find solution for. If you disconnect/reconnect server peer quickly enough, client peer will "remember" that host and will show it in the list of all available peers permanently, only turning wifi/bluetooth off resets this. So if I do this 5 times in a row, my client will show 5 available hosts with the same name! Anyone had experience with this? Any idea of workarounds? I should note that requirements for my game is iPhone SDK 3.0 for Bluetooth and 3.1 for Wifi as GKSession supports both now.

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• Shell script query

  - by WENzER

  Hi, I am having database. for that i want to get the script of all Store procedure. I have used dba_source table for getting script of Store procedure. Now I want to write a shell script which will give me all the scripts of store procedure in the seperate files. The approach i have applied that first I have written a query which will give the name of all store procedures and I am storing these names in seperate file. Now I am running a loop for getting sript of store procedures by using the names stored in file. All this i am able to do seperatly but not in shell script since I am new to it Please help me Thanks

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• Preserve "long" spaces in PDFBox text extraction

  - by Thilo

  I am using PDFBox to extract text from PDF. The PDF has a tabular structure, which is quite simple and columns are also very widely spaced from each-other This works really well, except that all kinds of horizontal space gets converted into a single space character, so that I cannot tell columns apart anymore (space within words in a column looks just like space between columns). I appreciate that a general solution is very hard, but in this case the columns are really far apart so that having a simple differentiation between "long spaces" and "space between words" would be enough. Is there a way to tell PDFBox to turn horizontal whitespace of more then x inches into something other than a single space? A proportional approach (x inch become y spaces) would also work.

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• Using GLOrtho to view Side, Front, Top perspectives of a 3D scene

  - by talldan

  Dear all, I'm building a game level editing app as part of a university project. In my application I have multiple viewports, a Perspective viewport and three orthographic views all setup to view the same scene. I've successfuly setup the orthographic views and can translate and scale them to mimic scrolling and zooming. Unfortunately, I'm having one problem - my scene still contains 3 dimensions, so objects viewed in orthographic mode of certain depths are clipped when they fall outside of my clipping volume. Most 3D authoring tools or level editors allow you to view all objects in orthographic mode regardless of depth. I guess what I need to do is scale my scene in the appropriate dimension so that all values lie between 1 and -1, is there a straightforward way of going about this? Or is there a different better approach. Thanks very much for your help, Dan

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• Making "helper" windows in WPF

  - by RandomEngy

  I'm writing an app in WPF and want to make a "helper" window. The window needs to be resizable, with no minimize option and doesn't show in the taskbar. If the app receives focus, it should appear as well, but whether or not it's in front or behind the main window should be retained. When the main window is closed, it should close along with the app. An example is a detached pane in Visual Studio. I've made the helper windows not appear in the taskbar, but can't get the rest of the behaviors I want. If they're their own windows, they don't get focus along with the rest of the app. If I specify a the main window as their owner, the main window can't be on top of the helper window. Anyone know a good way to approach this?

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• Use the [Serializable] attribute or subclassing from MarshalByRefObject?

  - by Theo Lenndorff

  I'd like to use an object across AppDomains. For this I can use the [Serializeable] attribute: [Serializable] class MyClass { public string GetSomeString() { return "someString" } } Or subclass from MarshalByRefObject: class MyClass: MarshalByRefObject { public string GetSomeString() { return "someString" } } In both cases I can use the class like this: AppDomain appDomain = AppDomain.CreateDomain("AppDomain"); MyClass myObject = (MyClass)appDomain.CreateInstanceAndUnwrap( typeof(MyClass).Assembly.FullName, typeof(MyClass).FullName); Console.WriteLine(myObject.GetSomeString()); Why do both approaches seem to have the same effect? What is the difference in both approaches? When should I favor the one approach over the other? EDIT: At the surface I know that there are differences between both mechanisms, but if someone jumped out of a bush and asked me the question I couldn't give him a proper answer. The questions are quite open questions. I hoped that someone can explain it better than I could do.

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• Why are action based web frameworks predominant?

  - by deamon

  Most web frameworks are still using the traditional action based MVC model. A controller recieves the request, calls the model and delegates rendering to a template. That is what Rails, Grails, Struts, Spring MVC ... are doing. The other category, the component based frameworks like Wicket, Tapestry, JSF, or ASP.Net Web Forms have become more popular over the last years, but my perception is that the traditional action based approach is far more popular. And even ASP .Net Web Forms has become a sibling name ASP .Net Web MVC. I think the kind of applications built with both types of frameworks is overlapping very much, so the question is: Why are action based frameworks so predominant?

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• Efficiency of while(true) ServerSocket Listen

  - by Submerged

  I am wondering if a typical while(true) ServerSocket listen loop takes an entire core to wait and accept a client connection (Even when implementing runnable and using Thread .start()) I am implementing a type of distributed computing cluster and each computer needs every core it has for computation. A Master node needs to communicate with these computers (invoking static methods that modify the algorithm's functioning). The reason I need to use sockets is due to the cross platform / cross language capabilities. In some cases, PHP will be invoking these java static methods. I used a java profiler (YourKit) and I can see my running ServerSocket listen thread and it never sleeps and it's always running. Is there a better approach to do what I want? Or, will the performance hit be negligible? Please, feel free to offer any suggestion if you can think of a better way (I've tried RMI, but it isn't supported cross-language. Thanks everyone

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• How to keep track of NSManagedObjects created in core-data persistently.

  - by KayKay

  In my application i am using core-data to store information and saving these data to the server using web-connectivity i have to use MySql. Basically what i want to do is to keep track of number of NSManagedObject already created and Whenever i am adding new NSManagedObject, based on that counting it will assign the class a Int_value which will act as primary_key in MySql. For examaple, there are already 10 NSManagedobjects, and when i will add new one it will assign it "11" as primary_key. these value will have to be increasing because there is no deleting of NSManagedObject. From my approach its about static member in applicationDelegate whose initial value can be any integer but should be incremented by one everytime new NSManagedObject is created and also it should be persistent. I am not clear how to do this, please give me suggestions. Thanks in advance.

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• Continuous integration with .net and svn

  - by stiank81

  We're currently not applying the automated building and testing of continous integration in our project. We haven't bothered this far as we're only 2 developers working on it, but even with a team of 2 I still think it would be valuable to use continous integration and get a confirmation that our builds don't break or tests start failing. We're using .Net with C# and WPF. We have created Python-scripts for building the application - using MSbuild - and for running all tests. Our source is in SVN. What would be the best approach to apply continous integration with this setup? What tool should we get? It should be one which doesn't require alot of setup. Simple procedures to get started and little maintanance is a must.

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• Issue in exec method

  - by mukul sharma

  Hi all, I am a having two python files file1.py and file2.py. I am using exec() to get the method/Variables defined in the file2.py. file1.py have a class as given below class one: def init(self): self.HOOK = None exec(file2.py) self.HOOK = Generate ### call the hook method #### self.HOOK() file2.py looks like as (There is no class define in file2.py) def Generate() do 1 do 2 Hello() def hello() print "hello" Now the problem is as When i run script it is giving a error global name Hello not found. If i remove Hello() from Generate method in file2.py then its work fine. I cant use import file2.py in file1.py,because in file2.py the only one method name (Generate) is fix (its taken as requirement). So apart from Genarate method user can define any method and can call this in generate method, because this approach is not working so i have to write whole code into generate method only and code is also repetitive. Any help is really appreciable...

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• NuGet - managing and removing mutil version packages in single solution

  - by Myles McDonnell

  SCENARIO One VS solution with n projects. Project A references package Y v1, Project B references package Y v2. It is now not possible to update all references to package Y for all projects in the solution using the NuGet package manage dialog at the solution level, it is only possible to do this when all projects reference the same version of package Y. Not a big deal for only two projects, but I'm dealing with lots of projects that through poor package management are referencing many package versions when they should all reference the same version. Before I spend the afternoon writing a console app. to auto update all package.config files for a solution so that each referenced package is only referenced via it's latest version (latest referenced, not the very latest, with exceptions/caveats etc)....is there a tool/method for doing this already? Or some other approach I am unaware of?

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• How to split but ignore separators in quoted strings, in python?

  - by Sly

  I need to split a string like this, on semicolons. But I don't what to split on semicolons that are inside of a string (' or "). I'm not parsing a file; just a simple string with no line breaks. part 1;"this is ; part 2;";'this is ; part 3';part 4 Result should be: part 1 "this is ; part 2" 'this is ; part 4' part 4 I suppose this can be done with a regex but if not; I'm open to another approach.

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• What would you recommend for a large-scale Java data grid technology: Terracotta, GigaSpaces, Cohere

  - by cliff.meyers

  I've been reading up on so-called "data grid" solutions for the Java platform including Terracotta, GigaSpaces and Coherence. I was wondering if anyone has real-world experience working any of these tools and could share their experience. I'm also really curious to know what scale of deployment people have worked with: are we talking 2-4 node clusters or have you worked with anything significantly larger than that? I'm attracted to Terracotta because of its "drop in" support for Hibernate and Spring, both of which we use heavily. I also like the idea of how it decorates bytecode based on configuration and doesn't require you to program against a "grid API." I'm not aware of any advantages to tools which use the approach of an explicit API but would love to hear about them if they do in fact exist. :) I've also spent time reading about memcached but am more interested in hearing feedback on these three specific solutions. I would be curious to hear how they measure up against memcached in the event someone has used both.

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• Rails: Internationalization of Javascript Strings?

  - by Matt Rogish

  So, we have an existing Rails 2.3.5 app that does not support Internationalization at all. Now, I'm well familiar with Rails I8n stuff, but we have a LOT of output strings inside /javascripts/. I'm not a huge fan of this approach, but unfortunately it is too late to fix it now. How might we internationalize strings stored in JS files in a Rails app? Rails doesn't even serve the JS files... I'm thinking I could always have the Rails app serve up the JS files, but that seems pretty gross. Are there plugins to do this? Yikes.

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• Recommended way to manage persistent PHP script processes?

  - by BigglesZX

  First off - hello, this is my first Stack Overflow question so I'll try my best to communicate properly. The title of my question may be a bit ambiguous so let me expand upon it immediately: I'm planning a project which involves taking data inputs from several "streaming" APIs, Twitter being one example. I've got a basic script coded up in PHP which runs indefinitely from the command line, taking input from the Twitter streaming API and doing very basic things with it. My eventual objective is to have several such processes running (perhaps daemonized using the System Daemon PEAR class), and I would like to be able to manage them from some governing process (also a PHP script). By manage I mean basic operations such as stop/start and (most crucially) automatically restarting a process that crashes. I would appreciate any pointers on how best to approach this process management angle. Again, apologies if this question is too expansive - tips on more tightly focused lines of enquiry would be appreciated if necessary. Thanks for reading and I look forward to your answers.

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• Implementing auto-save in WPF / MVVM / NHibernate

  - by Echiban

  My client likes programs like Microsoft OneNote where changes are saved automatically, and he can choose to discard when he explicitly wants to do so. I will have to implement some undo functionality, but I'll figure that out some other time. With NHibernate, I suppose I can call ISession.Update on every single property / binding change, but I can see real pain with this approach down the road. I am not a fan of timers, but maybe a 5 second timer that starts on property / binding change and at timer end use BackgroundWorker thread to save to db. What do you think?

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• How to handle packages provided Java using Eclipse P2

  - by ctron

  I got some OSGi bundles in binary form that declare dependencies to bundles like "org.ietf.jgss" which are provided by Java itself. P2 detects these dependencies and when I try to install the product later using the P2 director application the installation fails since no bundle provides these packages. But if I use the P2 product build I get a complete installed product that I can use. My problem is that I don't want to create product files and build for each variation of the application. So tried the approach to copy all P2 repositories in order to install the product on the target system using the P2 director. So how do I handle dependencies to packages provided by Java and how to I "convince" P2 to ignore these packages if they are provided by Java itself. Thanks for helping.

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• Handling Custom Protocols

  - by nomad311

  I'm looking to respond to an event from a web browser, hopefully any web browser. I'm working solely on windows and I came to the conclusion a custom protocol (I.E. myprot://collection/of/strings) is the best approach here (any objections?). But, handling an instance of this protocol seems to be a little less straight-forward. All I need is that collection of strings auto-magically passed to my already running application! (the app will only respond to these links while in a specific waiting state) So answer me this, if you can, Whats the 'popular' method of handling them or better yet Whats the 'best' (subjective - I know) way to do it? Although your answers don't need to be specific to my language, I am using Delphi for development. Thanks!

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• Graphical database monitoring tool for debugging

  - by salle55

  I would love a tool that in real-time showed changes in a set of predefined tables in a graphical way, for example different colors on fields that has changed value, added records, deleted records etc. I don't want a list of all transactions (like SQL Server Profiler), instead a clever visualized more graphical approach where you can get a great overview if you are just monitoring a few tables. I realize the visualization would be hard if there is a lot of transactions against the database, but with monitoring on a few tables and a single session during debugging it would be possible. Does something like this exist? I think it would be great for debugging! Preferably for SQL Server and/or MySQL.

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• How to suppress a group header based on running-count results?

  - by Sarah

  Hi I'm trying to suppress a group header when there are no detailed results in another following group. I have added a manual running count total which is showing correct numbers (such as 0 when no records show on the report). I've taken this approach since I have various items suppressed within the detailed section and don't want them as part of the count. I'm trying to say in the header not to shown the header if there are no corresponding records showing in the detailed section. But, it's not working. When I say suppress if the display count is 0, it suppresses all of the headers instead of just the ones that need to be displayed. HOW CAN I FIX THIS? THANKS... Sarah

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• Help on writing your own javax.swing.text.Document

  - by DJClayworth

  I'm writing a Java TextComponent where the underlying document has some structure. It is very short, basically one line. I need to be able to override the response to inserting or deleting characters in some parts of the document. My initial approach was to implement javax.swing.text.Document, but this seems to involve developing many associated classes (Element, EditorKit, View) and there don't seem to be many examples or tutorials on how to do this. There are plenty on using the pre-defined implementations. Can anyone point me at tutorials or other aids for simple implementations of Document and what other classes I need to create to make this work.

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• How can I translate my programmatic WCF configuration into app.config

  - by ofer

  Hi, I have an self hosted WCF server with hard coded configurations. the server worked fine until I tried to implement some new functionality. the new setting did not work (urrr.... ) and I find it hard to locate where are the problems in my code. instead of digging inside the code, I thought about different approach: Is there any way to dump those hard coded WCF configuration (the entire ) into app.config like text file after all configurations are loaded? this will enable me to have a easy global view of the entire settings .. mmm .. .by the way, does anyone know a way that will do the translation to the opposite direction? config to code. Any advice will be welcomed! ofer

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• Best practice for storage and retrieval of error messages.

  - by ferrari fan

  What is a best practice for storing user messages in a configuration file and then retrieving them for certain events throughout an application? I was thinking of having 1 single configuration file with entries such as REQUIRED_FIELD = {0} is a required field INVALID_FORMAT = The format for {0} is {1} etc. and then calling them from a class that would be something like this public class UIMessages { public static final String REQUIRED_FIELD = "REQUIRED_FIELD"; public static final String INVALID_FORMAT = "INVALID_FORMAT"; static { // load configuration file into a "Properties" object } public static String getMessage(String messageKey) { // return properties.getProperty(messageKey); } } Is this the right way to approach this problem or is there some de-facto standard already in place?

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