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  • Fill data gaps - UNION, PARTITION BY, or JOIN?

    - by Dave Jarvis
    Problem There are data gaps that need to be filled. Would like to avoid UNION or PARTITION BY if possible. Query Statement The select statement reads as follows: SELECT count( r.incident_id ) AS incident_tally, r.severity_cd, r.incident_typ_cd FROM report_vw r GROUP BY r.severity_cd, r.incident_typ_cd ORDER BY r.severity_cd, r.incident_typ_cd Data Sources The severity codes and incident type codes are from: severity_vw incident_type_vw The columns are: incident_tally severity_cd incident_typ_cd Actual Result Data 36 0 ENVIRONMENT 1 1 DISASTER 27 1 ENVIRONMENT 4 2 SAFETY 1 3 SAFETY Required Result Data 36 0 ENVIRONMENT 0 0 DISASTER 0 0 SAFETY 27 1 ENVIRONMENT 0 1 DISASTER 0 1 SAFETY 0 2 ENVIRONMENT 0 2 DISASTER 4 2 SAFETY 0 3 ENVIRONMENT 0 3 DISASTER 1 3 SAFETY Question How would you use UNION, PARTITION BY, or LEFT JOIN to fill in the zero counts?

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  • Is a new thread in a Visual Studio test project aborted when the test ends?

    - by Michel
    Hi, i have to do some message exchange with a 3rd party (in a website). When the client posts a page, i start the message exchange. When that doesn't succeed for some reason, i report this to the client by rendering the page with a message. On the background, in a separate thread, i start a process to send abort messages to the 3rd party. I can't do this while the user is waiting for the page to come back, because it might take a few minutes. But in a test project, the test ends when the message to the 3rd party is sent, and after the new thread is started. But it seems that the new thread also ends, when the test is done. Is that normal behaviour? I do start the thread in a new class with a reference to 2 objects from the class which tries to send the message in the first place, may that be a problem?

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  • What is used instead of SendMessage and PostMessage in Java to handle inter-thread communications?

    - by Kieveli
    I'm from a WinAPI / C++ background, and I'm curious as to what the Java world uses in place of a threaded message loop in a worker thread to handle communications and interactions between threads. The idea is to use a message pump in both the worker thread, and the main thread, and have them posting messages back and forth. This solution is very WinAPI / C++ centric, and probably not the preferred method of achieving this goal in Java. What is the 'Java' way to do something like this?

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  • How to properly handle signals when using the worker thread pattern?

    - by ipartola
    I have a simple server that looks something like this: void *run_thread(void *arg) { // Communicate via a blocking socket } int main() { // Initialization happens here... // Main event loop while (1) { new_client = accept(socket, ...); pthread_create(&thread, NULL, &run_thread, *thread_data*); pthread_detach(thread); } // Do cleanup stuff: close(socket); // Wait for existing threads to finish exit(0); ) Thus when a SIGINT or SIGTERM is received I need to break out of the main event loop to get to the clean up code. Moreover most likely the master thread is waiting on the accept() call so it's not able to check some other variable to see if it should break;. Most of the advice I found was along the lines of this: http://devcry.blogspot.com/2009/05/pthreads-and-unix-signals.html (creating a special signal handling thread to catch all the signals and do processing on those). However, it's the processing portion that I can't really wrap my head around: how can I possibly tell the main thread to return from the accept() call and check on an external variable to see if it should break;?

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  • Do I need a semaphore for my thread in Android/Java?

    - by Henrik
    Hello all, When running a thread in Android/Java: public void run() { while (running) { if (moreTasksToExec()) { task = getNextTask() task.exec(); } } } Is it OK to let it run and not using a semaphore to block while no work needs to be executed? I am only using one thread, so I need no inter-thread synchronization.

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  • mysql database design: thread and reply of a reply?

    - by ajsie
    in my forum i have threads and replies. one thread has multiple replies. but then, a reply can be a reply of an reply (like google wave). because of that a reply has to have a column "reply_id" so it can point to the parent reply. but then, the "top-level" replies (the replies directly under the thread) will have no parent reply. so how can i fix this? how should the columns be in the reply table (and thread table). at the moment it looks like this: threads: id title body replies: id thread_id (all replies will belong to a thread) reply_id (here lies the problem. the top-level replies wont have a parent reply) body what could a smart design look like to enable reply a reply?

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  • Saving core data in a thread, how to ensure its done writing before quitting?

    - by Shizam
    So I'm saving small images to core data which take a really short amount of time to save, like .2 seconds but I'm doing it while the user is flipping through a scroll view so in order to improve responsiveness I'm moving the saving to a thread. This works great, everything gets saved and the app is responsive. However, there is one thing in the core-data + multithreading doco that worries me: "In Cocoa, only the main thread is not-detached. If you need to save on other threads, you must write additional code such that the main thread prevents the application from quitting until all the save operation is complete." Ok, how do you do that? It only needs to last ~ .2 seconds and its rarely going to happen since the chance of the app quitting as something is saving is very low. How do I run something on the main thread that'll prevent the app from quitting AND not block the gui? Thanks

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  • How to terminate a managed thread blocked in unmanaged code?

    - by James Curran
    I have a managed thread which is waiting, blocked, in an unmanaged code (specifically, it on a call to NamedPipeServerStream.WaitForConnection() which ultimitely calls into unmanaged code, and does not offer a timeout). I want to shut the thread down neatly. Thread.Abort() has no effect until the code returns to the managed realm, which it won't do until a client makes a connection, which we can't wait for). I need a way "shock" it out of the unmanaged code; or a way to just kill the thread even while it's in unmanaged land.

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  • What the best multi-thread application debugger for C++ apps.

    - by Coredumped
    I'm looking for a good multi-thread-aware debugger, capable of showing performance charts of application threads on Linux, don't know if such a thing exists, perhaps as a Eclipse plugin. The idea would be to track per thread memory allocation a CPU usage as well as being able to interrupt a thread and examine its stack trace, local vars, etc. It does not have to be an eclipse plugin or a free tool, do any of you have heard of something similar?

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  • does anyone see any issues with this thread pattern?

    - by prmatta
    Here is a simple thread pattern that I use when writing a class that needs just one thread, and needs to a specific task. The usual requirements for such a class are that it should be startable, stopable and restartable. Does anyone see any issues with this pattern that I use? public class MyThread implements Runnable { private boolean _exit = false; private Thread _thread = null; public void start () { if (_thread == null) { _thread = new Thread(this, "MyThread"); _thread.start(); } } public void run () { while (_exit) { //do something } } public void stop () { _exit = true; if (_thread != null) { _thread.interrupt(); _thread = null; } } } I am looking for comments around if I am missing something, or if there is a better way to write this.

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  • New to threading in C#, can you make thread methods generic and what are the dangers?

    - by ibarczewski
    Hey all, I'm just now starting to get into the idea of threading, and wanted to know if I could make this more abstract. Both foo and bar derive methods from a base class, so I'd like to pass in one or the other and be able to do work using a method that was derived. I'd also like to know how you properly name threads and the methods inside threads. if (ChkFoo.Checked) { Thread fooThread = new Thread(new ThreadStart(this.ThreadedFooMethod)); fooThread.Start(); } if (ChkBar.Checked) { Thread barThread = new Thread(new ThreadStart(this.ThreadedBarMethod)); barThread.Start(); } . . . public void ThreadedFooMethod() { Foo newFoo = new Foo(); //Do work on newFoo } public void ThreadedBarMethod() { Bar newBar = new Bar(); //Do similar work } Thanks all!

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  • How to check if a thread is busy in C#?

    - by Sam
    I have a Windows Forms UI running on a thread, Thread1. I have another thread, Thread2, that gets tons of data via external events that needs to update the Windows UI. (It actually updates multiple UI threads.) I have a third thread, Thread3, that I use as a buffer thread between Thread1 and Thread2 so that Thread2 can continue to update other threads (via the same method). My buffer thread, Thread3, looks like this: public class ThreadBuffer { public ThreadBuffer(frmUI form, CustomArgs e) { form.Invoke((MethodInvoker)delegate { form.UpdateUI(e); }); } } What I would like to do is for my ThreadBuffer to check whether my form is currently busy doing previous updates. If it is, I'd like for it to wait until it frees up and then invoke the UpdateUI(e). I was thinking about either: a) //PseudoCode while(form==busy) { // Do nothing; } form.Invoke((MethodInvoker)delegate { form.UpdateUI(e); }); How would I check the form==busy? Also, I am not sure that this is a good approach. b) Create an event in form1 that will notify the ThreadBuffer that it is ready to process. // psuedocode List<CustomArgs> elist = new List<CustomArgs>(); public ThreadBuffer(frmUI form, CustomArgs e) { from.OnFreedUp += from_OnFreedUp(); elist.Add(e); } private form_OnFreedUp() { if (elist.count == 0) return; form.Invoke((MethodInvoker)delegate { form.UpdateUI(elist[0]); }); elist.Remove(elist[0]); } In this case, how would I write an event that will notify that the form is free? and c) an other ideas?

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  • Interrupting a thread from inside a runnable class? (java)

    - by kyeana
    I am trying to set up a method inside a class that implements the runnable interface that will set the interrupt status of that class. The reason i want to be able to do it from inside the class is there is some other clean up stuff that i need to take care of as well, and i would like to be able to do it all by calling one method instead of calling, for example: Gui gui = new Gui() // class that implements runnable Thread guiThread = new Thread(gui, "gui thread"); guiThread.start() ... ... guiThread.interrupt(); gui.cancel(); Currently my cancel code looks like this, however it isn't correctly setting the interrupt status of this thread. public void cancel() { Thread.currentThread().interrupt(); // other clean up code here. } Any advice on if/how i could get this working? Thanks. EDIT: I when i tried to get the cancel working, i commented out the guiThread.interrupt(), so that i wasn't just setting the status the reseting the status.

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  • Fill data gaps without UNION

    - by Dave Jarvis
    Problem There are data gaps that need to be filled, possibly using PARTITION BY. Query Statement The select statement reads as follows: SELECT count( r.incident_id ) AS incident_tally, r.severity_cd, r.incident_typ_cd FROM report_vw r GROUP BY r.severity_cd, r.incident_typ_cd ORDER BY r.severity_cd, r.incident_typ_cd Code Tables The severity codes and incident type codes are from: severity_vw incident_type_vw Actual Result Data 36 0 ENVIRONMENT 1 1 DISASTER 27 1 ENVIRONMENT 4 2 SAFETY 1 3 SAFETY Required Result Data 36 0 ENVIRONMENT 0 0 DISASTER 0 0 SAFETY 27 1 ENVIRONMENT 0 1 DISASTER 0 1 SAFETY 0 2 ENVIRONMENT 0 2 DISASTER 4 2 SAFETY 0 3 ENVIRONMENT 0 3 DISASTER 1 3 SAFETY Any ideas how to use PARTITION BY (or JOINs) to fill in the zero counts?

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  • TF30004: The New Team Project Wizard encountered an unexpected error while initializing the Microsof

    - by Frozzare
    Hello, i get this error when i trying to create a new project in team project. The server is right, i check all ports. I don't now what i should do now, can't find any good information 2009-09-19 01:45:41Z | Module: Internal | Team Foundation Server proxy retrieved | Completion time: 0.338 seconds 2009-09-19 01:45:41Z | Module: Internal | The template information for Team Foundation Server "TFSServer01" was retrieved from the Team Foundation Server. | Completion time: 0.099 seconds 2009-09-19 01:45:41Z | Module: Wizard | Retrieved IAuthorizationService proxy | Completion time: 0.404 seconds 2009-09-19 01:45:41Z | Module: Wizard | TF30227: Project creation permissions retrieved | Completion time: 0.015 seconds 2009-09-19 01:45:44Z | Module: Engine | Thread: 5 | New project will be created with the "MSF for Agile Software Development - v4.2" methodology 2009-09-19 01:45:44Z | Module: Engine | Retrieved IAuthorizationService proxy | Completion time: 0 seconds 2009-09-19 01:45:44Z | Module: Engine | TF30227: Project creation permissions retrieved | Completion time: 0.01 seconds 2009-09-19 01:45:45Z | Module: Engine | Wrote compressed process template file | Completion time: 0.001 seconds 2009-09-19 01:45:46Z | Module: Engine | Extracted process template file | Completion time: 1.428 seconds 2009-09-19 01:45:46Z | Module: Engine | Thread: 5 | Starting Project Creation for project "TestProject" in domain "TFSServer01" 2009-09-19 01:45:46Z | Module: Engine | The user identity information was retrieved from the Group Security Service | Completion time: 0.045 seconds 2009-09-19 01:45:46Z | Module: Initializer | Thread: 5 | The New Team Project Wizard is starting to initialize the plug-ins. 2009-09-19 01:45:46Z | Module: CssStructureUploader | Thread: 5 | Entering Initialize in CssStructureUploader 2009-09-19 01:45:46Z | Module: CssStructureUploader | Thread: 5 | Initialize for CssStructureUploader complete 2009-09-19 01:45:46Z | Module: Initializer | Thread: 5 | The New Team Project Wizard successfully Initialized the plug-in Microsoft.ProjectCreationWizard.Classification. 2009-09-19 01:45:46Z | Module: Rosetta | Thread: 5 | Entering Initialize in RosettaReportUploader 2009-09-19 01:45:48Z | Module: Rosetta | Thread: 5 | Exiting Initialize for RosettaReportUploader 2009-09-19 01:45:48Z | Module: Initializer | Thread: 5 | The New Team Project Wizard successfully Initialized the plug-in Microsoft.ProjectCreationWizard.Reporting. 2009-09-19 01:45:48Z | Module: WSS | Thread: 5 | Entering Initialize in WssSiteCreator 2009-09-19 01:45:48Z | Module: WSS | Thread: 5 | Site information: Title = "TestProject" Description = "This team project was created based on the 'MSF for Agile Software Development - v4.2' process template." 2009-09-19 01:45:48Z | Module: WSS | Thread: 5 | Base site url: http://TFSServer01:14143/webbplatser 2009-09-19 01:45:48Z | Module: WSS | Thread: 5 | Admin site url: http://TFSServer01:16183/_vti_adm/admin.asmx ---begin Exception entry--- Time: 2009-09-19 01:46:27 Z Module: Initialize Event Description: TF30207: Initialization for plugin "Microsoft.ProjectCreationWizard.Portal 'failed Exception Type: Microsoft.TeamFoundation.Client.PcwException Exception Message: The client discovered that content-type of request is text / html; charset = utf-8, but the text / xml expected. The request failed with error message: -- Unable to connect to the configuration database. --. Stack Trace: vid Microsoft.VisualStudio.TeamFoundation.WssSiteCreator.CheckPermissions(ProjectCreationContext ctxt) vid Microsoft.VisualStudio.TeamFoundation.WssSiteCreator.Initialize(ProjectCreationContext context) vid Microsoft.VisualStudio.TeamFoundation.EngineStarter.InitializePlugins(MsfTemplate template, PcwPluginCollection pluginCollection) -- Inner Exception -- Exception Type: System.InvalidOperationException Exception Message: The client discovered that content-type of request is text / html; charset = utf-8, but the text / xml expected. The request failed with error message: -- Unable to connect to the configuration database. --. Stack Trace: vid System.Web.Services.Protocols.SoapHttpClientProtocol.ReadResponse(SoapClientMessage message, WebResponse response, Stream responseStream, Boolean asyncCall) vid System.Web.Services.Protocols.SoapHttpClientProtocol.Invoke(String methodName, Object[] parameters) vid Microsoft.TeamFoundation.Proxy.Portal.Admin.GetLanguages() vid Microsoft.VisualStudio.TeamFoundation.WssSiteCreator.CheckPermissions(ProjectCreationContext ctxt) -- end Inner Exception -- --- end Exception entry --- Thanks for you help

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  • Safety concerns on allowing connections to MySQL with no password on localhost?

    - by ÉricO
    In the case of a Linux system, is there any security concern to let MySQL users with standard privileges (that is, not the root users) connect to the database with no password from localhost? I think that enforcing a password even for localhost can add a layer of protection, since, with no password the database access would be compromised if the SSH access is itself compromised. Considering that, would it be less safe to allow no password connection to MySQL than having the same password for SSH and for MySQL? I don't know if that is to be taken into account, but we also use phpMyAdmin to let users administrate their own database. I am asking because I kinda dislike having to put our database passwords unencrypted in the source or configuration files of our applications, where they can easily be leaked unintentionally. Since our servers are configured to run our applications as the Linux user the application belongs to, I was considering allowing no password from localhost as a simple solution. So, would that be a very bad idea or not?

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  • Tab Sweep: FacesMessage enhancements, Look up thread pool resources, JQuery/JSF integration, Galleria, ...

    - by arungupta
    Recent Tips and News on Java, Java EE 6, GlassFish & more : • Fixing remote GlassFish server errors on NetBeans (Igor Cardoso) • FacesMessage Enhancements (PrimeFaces) • How to create and look up thread pool resource in GlassFish (javahowto) • Jersey 1.12 is released (Jakub Podlesak) • VisualVM problem connecting to monitor Glassfish (Raymond Reid) • JSF 2.0 JQuery-JSF Integration (John Yeary) • JDBC-ODBC Bridge Example (John Yeary) • The Java EE 6 Example - Gracefully dealing with Errors in Galleria - Part 6 (Markus Eisele) • Logout functionality in Java web applications (JavaOnly) • LDAP PASSWORD POLICIES AND JAVAEE (Ricky's Hodgepodge) • Java User Groups Promote Java Education (java.net Editor's Daily Blog) • JavaEE Revisits Design Patterns: Aspects (Interceptor) (Developer Chronicles) • Java EE 6 Hand-on Workshop @ IIUI (Shahzad Badar) • javaee6-crud-example (Arjan Tims) • Sample CRUD application with JSF and RichFaces (Mark van der Tol) • 5 useful methods JSF developers should know (Java Code Geeks) Here are some tweets from this week ... Almost 9000 Parleys views at the #JavaEE6 #Devoxx talk I did with @BertErtman. Not even made available for free yet! #JavaEE6 is hot :-) Sent three proposals for Øredev, about #JavaEE6, #OSGi and a case study about Leren-op-Maat (OSGi in the cloud) together with @m4rr5 [blog] The Java EE 6 #Example - Gracefully dealing with #Errors in #Galleria - Part 6 http://t.co/Drg1EQvf #javaee6 Tomorrow, there is a session about Java EE6 #javaee6 at islamia university #bahawalpur under #pakijug.about 150 students going to attend it.

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  • Can threads safely read variables set by VCL events?

    - by Tom1952
    Is it safe for a thread to READ a variable set by a Delphi VCL event? When a user clicks on a VCL TCheckbox, the main thread sets a boolean to the checkbox's Checked state. CheckboxState := CheckBox1.Checked; At any time, a thread reads that variable if CheckBoxState then ... It doesn't matter if the thread "misses" a change to the boolean, because the thread checks the variable in a loop as it does other things. So it will see the state change eventually... Is this safe? Or do I need special code? Is surrounding the read and write of the variable (in the thread and main thread respectively) with critical code calls necessary and sufficient? As I said, it doesn't matter if the thread gets the "wrong" value, but I keep thinking that there might be a low-level problem if one thread tries to read a variable while the main thread is in the middle of writing it, or vice versa. My question is similar to this one: http://stackoverflow.com/questions/1353096/cross-thread-reading-of-a-variable. (Also related to my previous question: http://stackoverflow.com/questions/2449183/using-entercriticalsection-in-thread-to-update-vcl-label)

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