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  • Makefile automatic link dependency ?

    - by Kuang Chen
    It's easy to let program figure out the dependency at compile time, (with gcc -MM). Nevertheless, link dependency (deciding which libraries should be linked to) seems to be difficult to figure out. This issue become emergent when multiple targets with individual libraries to link to are needed. For instance, three dynamic library targets t1.so, t2.so and t3.so needs to be built. t1.so needs math library (-lm), while t2 and t3 don't. It would be tedious to write separate rules. A single rule requiring the three targets linked with math library saves the trouble. However, it causes inflation of target size since math library is unused for t2.so and t3.so. Any ideas?

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  • Selecting the 2nd row in sql

    - by Alex Chen
    I want to select the second row only from the table. From the ClientUserName column. SELECT ClientUserName, DestHost, count(DestHost) counts FROM #ProxyLog_record WHERE ClientUserName = (Select top 1 ClientUserName from #ProxyLog_count_2) GROUP BY ClientUserName, DestHost ORDER BY counts DESC The (Select top 1 ClientUserName from #ProxyLog_count_2) shows top 1 only but I need to get the 2nd data from that table. How can I do this?

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  • AS3: why is this happening?

    - by Bin Chen
    Hi, I just encounter a strange problem: var a:ClassA = new ClassA; var b:ClassA = a; The program keeps running sometime, the a = null, b = null. The program is a complex one, I am sure that no part will touch a, and b. My question is, will the runtime(garbage collector) to collect the memory of "a" and then assign a and b to null? I am confused, thanks!

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  • How can I ask Hibernate to create an index on a foreign key (JoinColumn)?

    - by Kent Chen
    Hi, This is my model. class User{ @CollectionOfElements @JoinTable(name = "user_type", joinColumns = @JoinColumn(name = "user_id")) @Column(name = "type", nullable = false) private List<String> types = new ArrayList<String>(); } You can imagin there would be a table called "user_type", which has two columns, one is "user_id", the other is "type". And when I use hbm2ddl to generate the ddls, I can have this table, along with the foreign key constraint on "user_id". However, there is no index of this for this column. And I need this index. How can I let hibernate to generate this index for me? Thank you!

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  • Magic Quadrant for x86 Server Virtualization Infrastructure

    - by Cinzia Mascanzoni
    The 2012 Gartner MQ for x86 Server Virtualization has just published.  KEY TAKEAWAYS - Oracle is in the “Challengers” quadrant. - This is a significant “jump” above the x-axis (from the “Niche” quadrant) during previous years - The move into the “Challengers” quadrant was possible for 3 primary reasons - 1) strength of the Oracle VM 3.0 release - 2) integrated management capabilities - 3) solid customer momentum during past year - Gartner even specifically states that Oracle VM use is growing amongst VMware customers Read the full report here.

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  • What are alternatives to Win32 PulseEvent() function?

    - by Bill
    The documentation for the Win32 API PulseEvent() function (kernel32.dll) states that this function is “… unreliable and should not be used by new applications. Instead, use condition variables”. However, condition variables cannot be used across process boundaries like (named) events can. I have a scenario that is cross-process, cross-runtime (native and managed code) in which a single producer occasionally has something interesting to make known to zero or more consumers. Right now, a well-known named event is used (and set to signaled state) by the producer using this PulseEvent function when it needs to make something known. Zero or more consumers wait on that event (WaitForSingleObject()) and perform an action in response. There is no need for two-way communication in my scenario, and the producer does not need to know if the event has any listeners, nor does it need to know if the event was successfully acted upon. On the other hand, I do not want any consumers to ever miss any events. In other words, the system needs to be perfectly reliable – but the producer does not need to know if that is the case or not. The scenario can be thought of as a “clock ticker” – i.e., the producer provides a semi-regular signal for zero or more consumers to count. And all consumers must have the correct count over any given period of time. No polling by consumers is allowed (performance reasons). The ticker is just a few milliseconds (20 or so, but not perfectly regular). Raymen Chen (The Old New Thing) has a blog post pointing out the “fundamentally flawed” nature of the PulseEvent() function, but I do not see an alternative for my scenario from Chen or the posted comments. Can anyone please suggest one? Please keep in mind that the IPC signal must cross process boundries on the machine, not simply threads. And the solution needs to have high performance in that consumers must be able to act within 10ms of each event.

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  • Outlook: Displaying email sender's job title in message list

    - by RexE
    Is there a way to display the sender's job title in the Outlook email list pane? I would like to see something like: From | Title | Subject | Received Joe Smith | President | Re: Proposal | 5:34 Bob Chen | Engineer | Fw: Request | 5:30 I am using Outlook 2010. All my mail comes through an Exchange 2010 server.

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  • unable to read serialzed data as message body in msmq c# 3.0

    - by ltech
    This is my method to send message to a private Q using (MessageQueue msgQ = new MessageQueue(MessageQueueName)) { using (System.Messaging.Message newMessage = new System.Messaging.Message(MessageBody, new System.Messaging.ActiveXMessageFormatter())) { newMessage.Label = MessageLabel; newMessage.Priority = Priority; msgQ.Send(newMessage); } } I have an order object which i serialize and send as message body. The serialized object is <?xml version="1.0"?> <OrderInfo> <OrderID>11111</OrderID> <OrderDetails> <LineItem> <ProductDetails> <Name>qwqwqw</Name> <Manufacturer>asasas</Manufacturer> <UPC>12222222222</UPC> <sku>2132</sku> <Price>12.21</Price> </ProductDetails> <Quantity>1</Quantity> </LineItem> </OrderDetails> </OrderInfo> This is my method to receive that message in a windows service void queue_ReceiveCompleted(object sender, ReceiveCompletedEventArgs asyncResult) { // Connect to the queue. MessageQueue mq = (MessageQueue)sender; // End the asynchronous Receive operation. Message m = mq.EndReceive(asyncResult.AsyncResult); m.Formatter = new System.Messaging.ActiveXMessageFormatter() //Get Filedata from body OrdrInfo qMessage = (OrdrInfo)XMLUtil.Deserialize(m.Body.ToString(), typeof(OrdrInfo)); } when I try to look at m.Body in quickwatch this is what it states m.Body.Message = Cannot find a formatter capable of reading this message. m.Body.StackTrace = at System.Messaging.Message.get_Body()

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  • Multhreading in Java

    - by Vijay Selvaraj
    I'm working with core java and IBM Websphere MQ 6.0. We have a standalone module say DBcomponent that hits the database and fetches a resultset based on the runtime query. The query is passed to the application via MQ messaging medium. We have a trigger configured for the queue which invokes the DBComponent whenever a message is available in the queue. The DBComponent consumes the message, constructs the query and returns the resultset to another queue. In this overall process we use log4j to log statements on a log file for auditing. The connection is pooled to the database using Apache pool. I am trying to check whether the log messages are logged correctly using a sample program. The program places the input message to the queue and checks for the logs in the log file. Its expected for the trigger method invocation to complete before i try to check for the message in log file, but every time my program to check for log message gets executed first leading my check to failure. Even if i introduce a Thread.sleep(time) doesn't solves the case. How can i make it to keep my method execution waiting until the trigger operation completes? Any suggestion will be helpful.

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  • I'm trying to install psycopg2 onto Mac OS 10.6.3; it claims it can't find "stdarg.h" but I can see

    - by cojadate
    I'm desperately trying to successfully install psycopg2 but keep running into errors. The latest one seems to involve it not being to find "stdarg.h" (see code below). However I can see with my own eyes that a file called stdarg.h exists at /Developer/SDKs/MacOSX10.4u.sdk/usr/include/stdarg.h (where it claims it can't find anything) so I've no idea what to do about it. I'm running Mac OS 10.6.3 and within the last few days I've made sure I have all the latest OS developer tools. I have Python 2.6.2 and PostgreSQL 8.4 if that makes any difference. python setup.py install running install running build running build_py running build_ext building 'psycopg2._psycopg' extension creating build/temp.macosx-10.3-fat-2.6 creating build/temp.macosx-10.3-fat-2.6/psycopg gcc -arch ppc -arch i386 -isysroot /Developer/SDKs/MacOSX10.4u.sdk -fno-strict-aliasing -fno-common -dynamic -DNDEBUG -g -O3 -DPSYCOPG_DEFAULT_PYDATETIME=1 -DPSYCOPG_VERSION="2.2.1 (dt dec ext pq3)" -DPG_VERSION_HEX=0x080404 -DPSYCOPG_EXTENSIONS=1 -DPSYCOPG_NEW_BOOLEAN=1 -DHAVE_PQFREEMEM=1 -DHAVE_PQPROTOCOL3=1 -I/Library/Frameworks/Python.framework/Versions/2.6/include/python2.6 -I. -I/opt/local/include/postgresql84 -I/opt/local/include/postgresql84/server -c psycopg/psycopgmodule.c -o build/temp.macosx-10.3-fat-2.6/psycopg/psycopgmodule.o In file included from /Library/Frameworks/Python.framework/Versions/2.6/include/python2.6/unicodeobject.h:4, from /Library/Frameworks/Python.framework/Versions/2.6/include/python2.6/Python.h:85, from psycopg/psycopgmodule.c:27: /Developer/SDKs/MacOSX10.4u.sdk/usr/include/stdarg.h:4:25: error: stdarg.h: No such file or directory In file included from /Library/Frameworks/Python.framework/Versions/2.6/include/python2.6/unicodeobject.h:4, from /Library/Frameworks/Python.framework/Versions/2.6/include/python2.6/Python.h:85, from psycopg/psycopgmodule.c:27: /Developer/SDKs/MacOSX10.4u.sdk/usr/include/stdarg.h:4:25: error: stdarg.h: No such file or directory lipo: can't figure out the architecture type of: /var/folders/MQ/MQ-tWOWWG+izzuZCrAJpzk+++TI/-Tmp-//ccakFhRS.out error: command 'gcc' failed with exit status

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  • grails services :: multiple projects

    - by naveen
    PROBLEM : I have multiple grails projects (lets say appA, appB and appC) : services to be precise I want to run them in a single grails-app.. probably a war deployment, how can i do this? REQUIREMENTS : I want this to be a single app since i am deploying it on cloud and i don't have enough memory to hold all these service instances individually. The reason for multiple grails project is scalability. So that if later on i want to run 10 instance of appA, 3 instance of appB, and 1 instance of aapC; i should be able to do that. EDIT : Can i use something like 0mq, will that be helpful in keeping the services separated from each other. How will i package my service? And reading the docs of 0mq seems that it can work with both inprocess and external process. Will async grails requests on HTTP work with 0mq in process/ external mq calls. Haven't used 0mq, but from the initial doc it seems to work. Need some experience calls in this scenario. Are there any other alternatives or mq alternatives?

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  • Architectural requirements Q&amp;A

    A few days ago I was contacted by Lianping Chen a doctoral researcher from the Irish Software Engineering Research Centre. Lianping is doing research on how to elicit architectural significant requirements and he asked me a few questions, which I though, might be interesting to a wider audience. 1. Do you agree that architecture design and requirements elicitation are usually in parallel or have a big time overlap? In other words, Architectural...Did you know that DotNetSlackers also publishes .net articles written by top known .net Authors? We already have over 80 articles in several categories including Silverlight. Take a look: here.

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  • Google I/O 2010 - OpenSocial in the Enterprise

    Google I/O 2010 - OpenSocial in the Enterprise Google I/O 2010 - Best practices for implementing OpenSocial in the Enterprise Social Web, Enterprise 201 Mark Weitzel, Matt Tucker, Mark Halvorson, Helen Chen, Chris Schalk Enterprise deployments of OpenSocial technologies brings an additional set of considerations that may not be apparent in a traditional social network implementation. In this session, several enterprise vendors will demonstrate how they've been working together to address these issues in a collection of "Best Practices". This session will also provide a review of existing challenges for enterprise implementations of OpenSocial. For all I/O 2010 sessions, please go to code.google.com From: GoogleDevelopers Views: 5 0 ratings Time: 38:23 More in Science & Technology

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  • Sun Grid Engine : jobs are not well balanced

    - by GlinesMome
    I use Open Grid Scheduler (a fork/copy of Sun Grid Engine). I have tried this configuration from master: # qconf -mattr exechost complex_values slots=8 slave2 # qconf -mq all.q | grep slots slots 100,[slave1=1],[slave2=8] slave1 is down, then I run 10 qsub with a sleep example (so no CPU consumption) but only 4 jobs are run at the same time on slave2 instead of I have put 8 slots. What does I missed ? PS: my goal is to provide infinite slots to force SGE to schedule only via consummable ressources.

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  • [objc_getClass("PLCameraController") sharedInstance] always returns nil in iPhone

    - by paul simmons
    I am trying to apply Mike Chen's answer here, using SDK 3.0. In delegate.m file I implement; [viewController.view addSubview:[[objc_getClass("PLCameraController") sharedInstance] previewView]]; and in viewcontroller.m I implement: PLCameraController *cam = [objc_getClass("PLCameraController") sharedInstance]; CapturedImage = [cam _createPreviewImage]; but 'cam' is always nil. Any suggestions?

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  • How do you rotate a two dimensional array?

    - by swilliams
    Inspired by Raymond Chen's post, say you have a 4x4 two dimensional array, write a function that rotates it 90 degrees. Raymond links to a solution in pseudo code, but I'd like to see some real world stuff. [1][2][3][4] [5][6][7][8] [9][0][1][2] [3][4][5][6] Becomes: [3][9][5][1] [4][0][6][2] [5][1][7][3] [6][2][8][4] Update: Nick's answer is the most straightforward, but is there a way to do it better than n^2? What if the matrix was 10000x10000?

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  • Using the framework of the problems encountered SharpArch

    - by livebean
    I try to test SharpArch frame, directly in the provided example code to write some code to add test data, but unsuccessful, do not have any information to me! ICustomerRepository customerRepository = new CustomerRepository(); Customer customer = new Customer("Jack Chen"); customer.SetAssignedIdTo("JACKK"); customerRepository.Save(customer); I just had an instance of CustomerRepository operation, do not understand why there is no new data on the data table

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  • Gartner: Magic Quadrant for Corporate Performance Management Suites, 2012

    - by Mike.Hallett(at)Oracle-BI&EPM
    Hyperion clearly leads the pack again in Gartner’s analysis of the CPM / EPM market, saying; “Oracle is a Leader in CPM suites, with one of the most widely distributed solutions in the market. Oracle Hyperion Enterprise Performance Management is recognized by CFOs worldwide. The vendor has a well-established partner channel, with both large and smaller CPM SI specialists. Hyperion skills are also plentiful among the independent consultant community, given the well-established products. “ “Oracle continues to innovate, bringing incremental improvements across the portfolio as well as new financial close management, disclosure management and predictive planning additions. Furthermore, Oracle has improved integration of Hyperion with the Oracle BI platform, and has improved planning performance, enabling Hyperion Planning to use Oracle Exalytics In-Memory Machine.” For the full article see here: Gartner: Magic Quadrant for Corporate Performance Management Suites, 2012 And if you missed it, here is also the MQ for BI: Gartner: Magic Quadrant for Business Intelligence Platforms, 2012

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  • Heterogén adatelérés OWB-vel: ODI EE Enterprise ETL

    - by Fekete Zoltán
    Az elozo ketto blogbejegyzéshez kapcsolódva felmerül a kérdés: Hogyan lehet az Oracle Warehouse Builderrel heterogén adatforrásokat elérni? Ajánlott olvasmány: Oracle Warehouse Builder 11gR2: OWB ETL Using ODI Knowledge Modules Természetesen az OWB az Oracle Database Heterogeneous Services-zel ODBC-vel illetve Oracle Gateway-k alkalmazásával eddig is lehetett mindenféle ODBC kompatibilis továbbá mainframe-es adatbázisokat elérni. Oracle Database Gateways: MS SQL Server, Sybase, Teradata, Informix, ODBC, DRDA, APPC, WebSphere MQ, DB2, DB2/400. A megfelelo Application Adapters megvásárlásával lehet csatlakozni az OWB-vel például a következo forrásokhoz: SAP, Oracle E-Business Suite, Peoplesoft, Siebel, Oracle Customer Data Hub (CDH), Universal Customer Master (UCM), Product Information Management (PIM). Az OWB 11gR2-tol kezdve az OWB tudja használni az Oracle Data Integrator Knowledge moduljait a heterogén adatelérésre, ez JDBC-vel illetve más heterogén elérési módokkal. Ajánlott olvasmány: Oracle Warehouse Builder 11gR2: OWB ETL Using ODI Knowledge Modules Letöltés: Oracle Warehouse Builder. BTW az OWB Java-s kliens szoftver Linux-on és Windows-on is használható. A szerver oldal pedig természetesen az Oracle adatbázisban fut: Solaris, Linux, HP-UX, AIX, Windows operációs rendszereken.

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  • Write own messaging system vs. utilize existing ones

    - by A.Rashad
    We are trying to have our own startup, with a middleware application to glue small applications with enterprise legacy systems. for such middle-ware to function properly, we will need some sort of messaging system to make different components talk to each other in a reliable way. the alternatives are: use an existing messaging system, such as 0MQ, jBOSS, WebSphere MQ, etc. build our own messaging system the way we see the problem I am more biased towards the later option for the following reasons: to have more control over our final product to avoid any licensing problems later on to learn about messaging while writing the code to invent something new, that might cost us lots of $$$ if reused an existing system What would you do if in my shoes?

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  • XUbuntu won't boot

    - by Slava Fomin II
    I can't properly boot my XUbuntu desktop. It just hangs on the console without any visible errors. The only way i can boot it properly is choosing "recovery mode" in GRUB and then selecting "continue booting" in recovery menu. It's really annoying. I provide some logs here: http://www.sendspace.com/filegroup/mQ%2FzdWvVcrjB3dz4vVqjsw Please advise! If you need some additional information i will be glad to provide it. Any hints and support will be much appreciated.

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