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• Asynchronous operations performance

  - by LicenseQ

  One of the features of asynchronous programming in .NET is saving threads during long running operation execution. The FileStream class can be setup to allow asynchronous operations, that allows running (e.g.) a copy operation without virtually using any threads. To my surprise, I found that running asynchronous stream copy performs not only slower, but also uses more processing power than synchronous stream copy equivalent. Is there any benchmark tests were done to compare a synchronous vs asynchronous operation execution (file, network, etc.)? Does it really make sense to perform an asynchronous operation instead of spanning separate thread and perform synchronous operation in server environment if the asynchronous operation is times slower than the synchronous one?

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• Can I use swank-clojure with the clojure 1.2 master branch?

  - by Rob

  I'm happily using swank-clojure, installed via elpa. But I'd like to do some work with deftype, defprotocol, etc., which aren't aren't available in clojure 1.1. To use my own class paths, I'm using the excellent suggestion by Rick Moynihan in the stackoverflow question about setting custom classpaths, which was to set up a script like: #!/bin/bash java -server -cp "./lib/*":./src clojure.main -e "(do (require 'swank.swank) (swank.swank/start-repl))" And that works swimmingly if the clojure jar file in lib is 1.1, but with 1.2, it blows up: Exception in thread "main" java.lang.NoSuchMethodError: clojure.lang.RestFn.<init>(I)V (macroexpand.clj:1) at clojure.lang.Compiler.eval(Compiler.java:5274) at clojure.lang.Compiler.load(Compiler.java:5663) at clojure.lang.RT.loadResourceScript(RT.java:330) at clojure.lang.RT.loadResourceScript(RT.java:321) at clojure.lang.RT.load(RT.java:399) at clojure.lang.RT.load(RT.java:371) at clojure.core$load__5663$fn__5671.invoke(core.clj:4255) at clojure.core$load__5663.doInvoke(core.clj:4254) at clojure.lang.RestFn.invoke(RestFn.java:409) ...and many, many more So is there some magical incantation to make this work, or is clojure 1.2 compatibility not there yet?

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• WinForms Taskbar Icon - Click Event not firing

  - by Greycrow

  I have created a non-form c# program that uses the NotifyIcon class. The text "(Click to Activate)" shows up when I hover the mouse. So I am getting some events handled. However, The "Click" event does not fire and the Context menu doesnt show up. public class CTNotify { static NotifyIcon CTicon = new NotifyIcon(); static ContextMenu contextMenu = new ContextMenu(); static void Main() { //Add a notify Icon CTicon.Icon = new Icon("CTicon.ico"); CTicon.Text = "(Click to Activate)"; CTicon.Visible = true; CTicon.Click += new System.EventHandler(CTicon_Click); //Create a context menu for the notify icon contextMenu.MenuItems.Add("E&xit"); //Attach context menu to icon CTicon.ContextMenu = contextMenu; while (true) //Infinite Loop { Thread.Sleep(300); //wait } } private static void CTicon_Click(object sender, System.EventArgs e) { MessageBox.Show("Clicked!"); } }

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• WCF - Passing CurrentPrincipal in the Header

  - by David Ward

  I have a WCF service that needs to know the Principal of the calling user. In the constructor of the service I have: Principal = OperationContext.Current.IncomingMessageHeaders.GetHeader<MyPrincipal>("myPrincipal", "ns"); and in the calling code I have something like: using (var factory = new ChannelFactory<IMyService>(localBinding, endpoint)) { var proxy = factory.CreateChannel(); using (var scope = new OperationContextScope((IContextChannel)proxy)) { var customHeader = MessageHeader.CreateHeader("myPrincipal", "ns", Thread.CurrentPrincipal); OperationContext.Current.OutgoingMessageHeaders.Add(customHeader); newList = proxy.CreateList(); } } This all works fine. My question is, how can I avoid having to wrap all proxy method calls in the using (var scope...{ [create header and add to OperationContext]? Could I create a custom ChannelFactory that will handle adding the myPrincipal header to the operation context? Something like that would save a whole load of copy/paste which I'd rather not do but I'm not sure how to achieve it:) Thanks

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• atomic writes to ehcache

  - by Jacques René Mesrine

  Context I am storing a java.util.List inside ehcache. Key(String) --> List<UserDetail> The ordered List contains a Top 10 ranking of my most active users. Problem Concurrent 3rd party clients might be requesting for this list. I have a requirement to be as current as possible with regards to the ranking. Thus if the ranking is changed due the activities of users, the ordered List in the cache must not be left stale for very long. Once I've recalculated a new List, I want to replace the one in cache immediately. Consider a busy scenario whereby multiple concurrent clients are requesting for the ranking; how can I replace the cache item in an fashion such that: Clients can continue to pull a possibly stale snapshot. They should never get a null value. There will only be 1 server thread that writes to the cache.

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• Proper Case Title Case Question

  - by Michael Quiles

  What am i doing wrong here? I want the users name to be shown in the output as propercase but I cant figure it out. string proper = this.xTripNameTextBox.Text; CultureInfo properCase = System.Threading.Thread.CurrentThread.CurrentCulture; TextInfo currentInfo = properCase.TextInfo; proper = currentInfo.ToTitleCase(proper); this.xTripOutputLabel.Text = proper + Environment.NewLine + "The total gallons you would use: " + Output.ToString("0") + Environment.NewLine + "Total amount it will cost you: " + Coutput.ToString("C") + Environment.NewLine +" Your customer number is " + rnd1.Next(1, 1000).ToString();

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• How can I set up .NET UnhandledException handling in a Windows service?

  - by Mike Pateras

  protected override void OnStart(string[] args) { AppDomain.CurrentDomain.UnhandledException += new UnhandledExceptionEventHandler(CurrentDomain_UnhandledException); Thread.Sleep(10000); throw new Exception(); } void CurrentDomain_UnhandledException(object sender, UnhandledExceptionEventArgs e) { } I attached a debugger to the above code in my windows service, setting a breakpoint in CurrentDomain_UnhandledException, but it was never hit. The exception pops up saying that it is unhandled, and then the service stops. I even tried putting some code in the event handler, in case it was getting optimized away. Is this not the proper way to set up unhandled exception handling in a windows service?

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• Android Image Orientation Issue on Motorola Droid

  - by roundhill

  Hi there, Our app uses the gallery pick action to grab an image from the device to upload to a new blog post. We're seeing on the Moto Droid that images taken in portrait are being sent back to the app in landscape orientation so the image is sideways. AFAIK this only occurs on the Droid. Found this via google, but we need the full size image to be uploaded in the correct orientation so the solution doesn't work for us: http://groups.google.com/group/android-developers/browse_frm/thread/1246475fd4c3fdb6?pli=1 An easy way to reproduce this is to take a picture in portrait on the Droid, then send it to yourself via Gmail. In the email message, the image will be in landscape (sideways). I've tested on the droid 2.1 update and the issue is still there.

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• How to access MyProject.MySettings.Default.SomeSetting from xaml?

  - by Shimmy

  I have defined a StringCollection in the Project Settings. I want to use the values in a ComboBox. Is there a way to access it xamly? I tried: <CollectionViewSource Source="{x:Static src:MySettings.Default.MyCollection}" /> <CollectionViewSource x:Key="RoomSections" Source="{x:Static src:MySettings.Default.RoomSections}" /> *src is the xmlns of the project It says: "Type src:MySettings.Default was not found". The thing is that MySettings is a class that offers a Default property which is a thread-safe instance of MySettings, I really want to get the collection from the Default property and not by instantiating a new on. Is there other ways I am not aware of, maybe ObjectDataProvider can access static objects? I thought, maybe I can make in the App.xaml a global resource that return MySettings.Default which is an instance of the MySettings class, and then access all its properties, I will try that out, but I prefer the easy way.

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• java.lang.NoSuchMethodError: main when starting HelloWorld with Eclipse Scala plugin

  - by Matt Sheppard

  I've just been playing with Scala, and installed the Eclipse plugin as described at http://www.scala-lang.org/node/94, but after entering the "Hello World" test example and setting up the run configuration as described, I get the following error Exception in thread "main" java.lang.NoSuchMethodError: main For reference the code is package hello object HelloWorld extends Application { println("Hello World!") } I've tinkered a bit with the obvious solutions (adding a main method, adding a singleton object with a main method) but I'm clearly doing something wrong. Can anyone get their test example to work, or point out what I am doing wrong?

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• Logging strategy vs. performance

  - by vtortola

  Hi, I'm developing a web application that has to support lots of simultaneous requests, and I'd like to keep it fast enough. I have now to implement a logging strategy, I'm gonna use log4net, but ... what and how should I log? I mean: How logging impacts in performance? is it possible/recomendable logging using async calls? Is better use a text file or a database? Is it possible to do it conditional? for example, default log to the database, and if it fails, the switch to a text file. What about multithreading? should I care about synchronization when I use log4net? or it's thread safe out of the box? In the requirements appear that the application should cache a couple of things per request, and I'm afraid of the performance impact of that. Cheers.

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• XML Validation

  - by Keya

  Hi, I want to validate an XML file against RELAXNG schema provided. Searching on the net gave me hints to create a Schema instance using SchemaFactory by providing the appropriate Schema Language. So as per my requirement I used: *SchemaFactory.newInstance(XMLConstants.RELAXNG_NS_URI);* But the following exception was thrown at run: Exception in thread "main" java.lang.IllegalArgumentException: No SchemaFactory that implements the schema language specified by: http://relaxng.org/ns/structure/1.0 could be loaded at javax.xml.validation.SchemaFactory.newInstance(SchemaFactory.java:207) I am using Java6 and observed that only 'W3C_XML_SCHEMA_NS_URI' works. Rest all the schema URIs throws the similar exception. I am fairly new to using the XML validation APIs. Can someone please provide me the appropriate usage in case I am not doing it correctly? Thanks & Regards, Keya

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• Exception while running Quartz Schdular program

  - by Sunny Mate

  hi, i am getting he following Exception while running my Quartz Schdular program. Below is the exception Trace Mar 26, 2010 2:54:24 PM org.quartz.core.QuartzScheduler start INFO: Scheduler DefaultQuartzScheduler_$_NON_CLUSTERED started. Exception in thread "main" java.lang.IllegalArgumentException: Job class must implement the Job interface. at org.quartz.JobDetail.setJobClass(JobDetail.java:291) at org.quartz.JobDetail.(JobDetail.java:138) at com.Quarrtz.RanchSchedule.main(RanchSchedule.java:18) i have included Quartz-1.7.2.jar and Quartz-all-1.7.2.jar in my class path along with commom-logging 1.1.jar and jdk 6 this is an example i have copy and pasted from JAVA RANCH http://www.javaranch.com/journal/200711/combining_spring_and_quartz.html First example in the above page any help pls thanx in advance Sunny Mate

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• C# Multithreading File IO (Reading)

  - by washtik

  We have a situation where our application needs to process a series of files and rather than perform this function synchronously, we would like to employ multi-threading to have the workload split amongst different threads. Each item of work is: 1. Open a file for read only 2. Process the data in the file 3. Write the processed data to a Dictionary We would like to perform each file's work on a new thread? Is this possible and should be we better to use the ThreadPool or spawn new threads keeping in mind that each item of "work" only takes 30ms however its possible that hundreds of files will need to be processed. Any ideas to make this more efficient is appreciated.

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• WCF Windows Service - Long operations/Callback to calling module

  - by A9S6

  I have a Windows Service that takes the name of a bunch of files and do operations on them (zip/unzip, updating db etc). The operations can take time depending on size and number of files sent to the service. (1) The module that is sending a request to this service waits until the files are processed. I want to know if there is a way to provide a callback in the service that will notify the calling module when it is finished processing the files. Please note that multiple modules can call the service at a time to process files so the service will need to provide some kind of a TaskId I guess. (2) If a service method is called and is running and another call is made to the same service, then how will that call be processed(I think there is only one thread asociated with the service). I have seen that when the service is taking time in processing a method, the threads associated with the service begin to increase.

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• How to get vm arguments from inside of java application?

  - by Dmitriy Matveev

  Hello, I need to check if some option which can be passed to JVM is explicitly set or is it have default value. To be more specific: I need to create one specific thread with higher native stack size than the default one, but in case then user want to take care of such things by himself by specifying -Xss option I want to create all threads with default stack size (which will be specified by user in -Xss option). I've checked classes like java.lang.System and java.lang.Runtime, but these aren't giving me information about vmargs. Is there any way to get information I need?

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• Should I use Mutex OR Critical Section for Windows Mobile RIL

  - by afriza

  Hi, I am using a Radio Layer Interface (RIL) Native API in Windows Mobile application. In this API, the return values / results of most functions are not returned immediately but are passed through a callback function which is passed to the RIL API. Some usage examples are found at XDA Develompent Tools and Google Gears Geolocation API. My question is, in these two examples, a mutex is used to guard the data instead of other synchronization objects. Now, will Critical Section do fine here in the use cases described by both examples? Which thread or process will actually call the callback functions?

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• Apache on linux : spawning processes or threads ?

  - by Jerome WAGNER

  Hello, I would like to understand better exactly what is going on when Apache on linux receive an HTTP request in a process pre-fork model. Let's say we have 20 Apache child processes waiting. When I receive an HTTP request, is it true to say that 1 child process will be chosen to handle the request and that this process won't handle another request from another user until the first one is finished ? I am asking the question because of a PHP limitation that states : The locale information is maintained per process, not per thread. If you are running PHP on a multithreaded server API like IIS or Apache on Windows, you may experience sudden changes in locale settings while a script is running, though the script itself never called setlocale(). This happens due to other scripts running in different threads of the same process at the same time, changing the process-wide locale using setlocale(). Thanks Jerome Wagner

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• Are there free realtime financial data feeds since the demise of OpenQuant?

  - by Mel Cooper

  Now that the oligopole of market data providers successfully killed OpenQuant, does any alternative to proprietary and expensive subscriptions for realtime market data subsist? Ideally I would like to be able to monitor tick by tick securities from the NYSE, NASDAQ and AMEX (about 6000 symbols). Most vendors put a limit of 500 symbols watchable at the same time, this is unacceptable to me, even if one can imagine a rotation among the 500 symbols ie. making windows of 5 sec. of effective observation out of each minute for every symbol. Currently I'm doing this by a Java thread pool calling Google Finance, but this is unsatisfactory for several reasons, one being that Google doesn't return the volume traded. Any hint much appreciated, Cheers

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• Deciding between Apache Commons exec or ProcessBuilder

  - by Moev4

  I am trying to decide as to whether to use ProcessBuilder or Commons exec, My requirements are that I am simply trying to create a daemon process whose stdout/stdin/stderr I do not care about. In addition I want to execute a kill to destroy this process when the time comes. I am using Java on Linux. I know that both have their pains and pitfalls (such as being sure to use separate thread to swallow streams can lead to blocking or deadlocks, and closing the streams so not to leave open files hanging around)and wanted to know if anyone had suggestions one way or the other as well as any good resources to follow.

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• How to test localized winforms application?

  - by Sun

  Background: I have created sample windows application for learning to implement localization. My each form has two RESX file. One for Bulgaria and one for French(Belgium). It has default culture English(XX) To test locally currently I am programmatically changing UICulture i.e. Thread.CurrentThread.CurrentUICulture = new CultureInfo("fr-BE"); And it works fine. Problem: How can I test without forcing the UI Culture programatically? I have tried changing Control Panel Regional Options Standard and Formats to French(Belgium). That made changes to DatePickerControl and now it display the dates French. However I can still see the Button text in English, where as if I test by injecting CultureInfo programmatically it changes to french. If I am able to change the standard and formats to French do I still need to Install Multilingual User Interface Pack (MUI)?

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• Having Problems Getting FreeTTS and JSAPI Working

  - by Travis

  I have a simple project idea based off of FreeTTS and the JSAPI (Java Speech API) I've downloaded and unpacked FreeTTS and run their build script. Then tried compiling my code linking in the lib directory into the class path like this: javac -cp /home/travis/Desktop/freetts-1.2/lib HelloUnleashedReader.java Which then compiles to java bytecode just fine. However when I run: java HelloUnleashedReader I get the following error: Exception in thread "main" java.lang.NoClassDefFoundError: javax/speech/EngineModeDesc Any help on this issue would be greatly appreciated as there are many sites around the net discussing problems with getting it to work but not many that discuss their solution.

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• MSB3422 Failed to retrieve VC project information through the VC project engine object model. MSB342

  - by Scott Langham

  I'm getting the following errors from MSBuild while trying to build a solution: C:\dev\MySln.sln : warning MSB3422: Failed to retrieve VC project information through the VC project engine object model. Unable to determine default tool for the specified file configuration. C:\dev\MySln.sln : warning MSB3425: Could not resolve VC project reference "C:\dev\MyProj.vcproj". Have you got any ideas on what's causing this? I've seen other postings about similar, but different errors such as when the MSB3422 error has a different message and shows "Illegal characters in path.", but I haven't seen any useful information about how to solve the error I'm getting where it says "Unable to determine default tool for the specified file configuration.". Thanks. I found this, but it doesn't really help: http://social.msdn.microsoft.com/Forums/en-US/msbuild/thread/b470f111-9321-4b43-8bd1-7fcf67c2d402

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• SharedPreferences.onSharedPreferenceChangeListener not being called consistently

  - by synic

  I'm registering a preference change listener like this (in the onCreate() of my main activity): SharedPreferences prefs = PreferenceManager.getDefaultSharedPreferences(this); prefs.registerOnSharedPreferenceChangeListener( new SharedPreferences.OnSharedPreferenceChangeListener() { public void onSharedPreferenceChanged( SharedPreferences prefs, String key) { System.out.println(key); } }); The trouble is, the listener is not always called. It works for the first few times a preference is changed, and then it is no longer called until I uninstall and reinstall the app. No amount of restarting the application seems to fix it. I found a mailing list thread reporting the same problem, but no one really answered him. What am I doing wrong?

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• On MacOSX, in a C++ program, what guarantees can I have on file IO

  - by anon

  I am on MacOSX. I am writing a multi threaded program. One thread does logging. The non-logging threads may crash at any time. What conventions should I adopt in the logger / what guarantees can I have? I would prefer a solution where even if I crash during part of a write, previous writes still go to disk, and when reading back the log, I can figure out "ah, I wrote 100 complete enties, then I crashed on the 101th". Thanks!

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