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• java.util.zip.ZipException in Glassfish (v3) application deployment

  - by Kevin

  Hello, I've got a strange exception with my EJB3.1 application, a ZipException is thrown during the application deployment: [#|2010-05-15T16:01:44.688+0100|SEVERE|glassfish3.0.1|javax.enterprise.system.container.web.org.glassfish.web.loader|_ThreadID=22;_ThreadName=Thread-1;|WEB9051: Error trying to scan the classes at /Users/kevin/Documents/netbeans/WebAlbums/trunk/WebAlbums3/WebAlbums3-ea/dist/gfdeploy/WebAlbums3-Service.jar for annotations in which a ServletContainerInitializer has expressed interest java.util.zip.ZipException: error in opening zip file at java.util.zip.ZipFile.open(Native Method) at java.util.zip.ZipFile.<init>(ZipFile.java:114) at java.util.jar.JarFile.<init>(JarFile.java:133) at java.util.jar.JarFile.<init>(JarFile.java:70) at org.glassfish.web.loader.ServletContainerInitializerUtil.getInitializerList(ServletContainerInitializerUtil.java:255) at org.apache.catalina.core.StandardContext.callServletContainerInitializers(StandardContext.java:5331) at com.sun.enterprise.web.WebModule.callServletContainerInitializers(WebModule.java:550) at org.apache.catalina.core.StandardContext.start(StandardContext.java:5263) at com.sun.enterprise.web.WebModule.start(WebModule.java:499) at org.apache.catalina.core.ContainerBase.addChildInternal(ContainerBase.java:928) at org.apache.catalina.core.ContainerBase.addChild(ContainerBase.java:912) at org.apache.catalina.core.StandardHost.addChild(StandardHost.java:694) at com.sun.enterprise.web.WebContainer.loadWebModule(WebContainer.java:1947) at com.sun.enterprise.web.WebContainer.loadWebModule(WebContainer.java:1619) at com.sun.enterprise.web.WebApplication.start(WebApplication.java:90) at org.glassfish.internal.data.EngineRef.start(EngineRef.java:126) at org.glassfish.internal.data.ModuleInfo.start(ModuleInfo.java:241) at org.glassfish.internal.data.ApplicationInfo.start(ApplicationInfo.java:236) at com.sun.enterprise.v3.server.ApplicationLifecycle.deploy(ApplicationLifecycle.java:339) at com.sun.enterprise.v3.server.ApplicationLifecycle.deploy(ApplicationLifecycle.java:183) at org.glassfish.deployment.admin.DeployCommand.execute(DeployCommand.java:272) at com.sun.enterprise.v3.admin.CommandRunnerImpl$1.execute(CommandRunnerImpl.java:305) at com.sun.enterprise.v3.admin.CommandRunnerImpl.doCommand(CommandRunnerImpl.java:320) at com.sun.enterprise.v3.admin.CommandRunnerImpl.doCommand(CommandRunnerImpl.java:1176) at com.sun.enterprise.v3.admin.CommandRunnerImpl.access$900(CommandRunnerImpl.java:83) at com.sun.enterprise.v3.admin.CommandRunnerImpl$ExecutionContext.execute(CommandRunnerImpl.java:1235) at com.sun.enterprise.v3.admin.CommandRunnerImpl$ExecutionContext.execute(CommandRunnerImpl.java:1224) at com.sun.enterprise.v3.admin.AdminAdapter.doCommand(AdminAdapter.java:365) at com.sun.enterprise.v3.admin.AdminAdapter.service(AdminAdapter.java:204) at com.sun.grizzly.tcp.http11.GrizzlyAdapter.service(GrizzlyAdapter.java:166) at com.sun.enterprise.v3.server.HK2Dispatcher.dispath(HK2Dispatcher.java:100) at com.sun.enterprise.v3.services.impl.ContainerMapper.service(ContainerMapper.java:245) at com.sun.grizzly.http.ProcessorTask.invokeAdapter(ProcessorTask.java:791) at com.sun.grizzly.http.ProcessorTask.doProcess(ProcessorTask.java:693) at com.sun.grizzly.http.ProcessorTask.process(ProcessorTask.java:954) at com.sun.grizzly.http.DefaultProtocolFilter.execute(DefaultProtocolFilter.java:170) at com.sun.grizzly.DefaultProtocolChain.executeProtocolFilter(DefaultProtocolChain.java:135) at com.sun.grizzly.DefaultProtocolChain.execute(DefaultProtocolChain.java:102) at com.sun.grizzly.DefaultProtocolChain.execute(DefaultProtocolChain.java:88) at com.sun.grizzly.http.HttpProtocolChain.execute(HttpProtocolChain.java:76) at com.sun.grizzly.ProtocolChainContextTask.doCall(ProtocolChainContextTask.java:53) at com.sun.grizzly.SelectionKeyContextTask.call(SelectionKeyContextTask.java:57) at com.sun.grizzly.ContextTask.run(ContextTask.java:69) at com.sun.grizzly.util.AbstractThreadPool$Worker.doWork(AbstractThreadPool.java:330) at com.sun.grizzly.util.AbstractThreadPool$Worker.run(AbstractThreadPool.java:309) at java.lang.Thread.run(Thread.java:637) |#] I don't really know how to investigate this error; I know that it's not related to the glassfish installation (same problem on Ubuntu and Mac) ... I spot a 'null' in the classpath definition (log level fine), maybe that's the reason, but I don't know how to get rid of it ... [#|2010-05-15T16:01:44.672+0100|FINE|glassfish3.0.1|javax.enterprise.system.container.web.com.sun.enterprise.web|_ThreadID=22;_ThreadName=Thread-1;ClassName=com.sun.enterprise.web.WebModuleListener;MethodName=configureJsp;| sysClasspath for WebAlbums3-ea#WebAlbums3-Servlet.war is /Users/kevin/apps/glassfishv3/glassfish/modules/antlr-repackaged.jar:...:/Users/kevin/apps/glassfishv3/glassfish/modules/gf-client-module.jar:/Users/kevin/apps/glassfishv3/glassfish/modules/javax.security.auth.message.jar:null:/Users/kevin/apps/glassfishv3/glassfish/modules/org.eclipse.persistence.antlr.jar:/Users/kevin/apps/glassfishv3/glassfish/domains/domain1/lib/classes:/Users/kevin/apps/glassfishv3/glassfish/domains/domain1/lib/RT-DB-mysql-connector-java-5.1.12-bin.jar:|#] (I'm using Netbeans 6.8, Glassfish v3, Servlet3, EJB 3.1, JPA/Hibernate) Thank you for your help

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• NHibernate which cache to use for WinForms application

  - by chiccodoro

  I have a C# WinForms application with a database backend (oracle) and use NHibernate for O/R mapping. I would like to reduce communication to the database as much as possible since the network in here is quite slow, so I read about second level caching. I found this quite good introduction, which lists the following available cache implementations. I'm wondering which implementation I should use for my application. The caching should be simple, it should not significantly slow down the first occurrence of a query, and it should not take much memory to load the implementing assemblies. (With NHibernate and Castle, the application already takes up to 80 MB of RAM!) Velocity: uses Microsoft Velocity which is a highly scalable in-memory application cache for all kinds of data. Prevalence: uses Bamboo.Prevalence as the cache provider. Bamboo.Prevalence is a .NET implementation of the object prevalence concept brought to life by Klaus Wuestefeld in Prevayler. Bamboo.Prevalence provides transparent object persistence to deterministic systems targeting the CLR. It offers persistent caching for smart client applications. SysCache: Uses System.Web.Caching.Cache as the cache provider. This means that you can rely on ASP.NET caching feature to understand how it works. SysCache2: Similar to NHibernate.Caches.SysCache, uses ASP.NET cache. This provider also supports SQL dependency-based expiration, meaning that it is possible to configure certain cache regions to automatically expire when the relevant data in the database changes. MemCache: uses memcached; memcached is a high-performance, distributed memory object caching system, generic in nature, but intended for use in speeding up dynamic web applications by alleviating database load. Basically a distributed hash table. SharedCache: high-performance, distributed and replicated memory object caching system. See here and here for more info My considerations so far were: Velocity seems quite heavyweight and overkill (the files totally take 467 KB of disk space, haven't measured the RAM it takes so far because I didn't manage to make it run, see below) Prevalence, at least in my first attempt, slowed down my query from ~0.5 secs to ~5 secs, and caching didn't work (see below) SysCache seems to be for ASP.NET, not for winforms. MemCache and SharedCache seem to be for distributed scenarios. Which one would you suggest me to use? There would also be a built-in implementation, which of course is very lightweight, but the referenced article tells me that I "(...) should never use this cache provider for production code but only for testing." Besides the question which fits best into my situation I also faced problems with applying them: Velocity complained that "dcacheClient" tag not specified in the application configuration file. Specify valid tag in configuration file," although I created an app.config file for the assembly and pasted the example from this article. Prevalence, as mentioned above, heavily slowed down my first query, and the next time the exact same query was executed, another select was sent to the database. Maybe I should "externalize" this topic into another post. I will do that if someone tells me it is absolutely unusual that a query is slowed down so much and he needs further details to help me.

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• NLP with greatly contrained input and abilities

  - by Mike F

  Hat in hand here. I'm a seasoned developer and I would be grateful for a bit of help. I don't have time to read or digest long intricate discussions on theoretical concepts around NLP (or go get my PHD). That said, I have read a few and it's a damn interesting field. The problem is I need real world solutions, for real world products, in real world time frames. The problem I'm having is right now I'm not sure what the right questions are to ask to get started implementing. I believe this is mostly related to vocabulary. I'll read somewhere, a blog post, a forum post, a whitepaper, and it says, I'm doing flooping with the blargy blarg method, and I go google flooping and blargy blarg, and I get references to more obscurity. It seemingly never ends. So, my question is multiphased. First, more generally, how do I become passingly educated on this quickly? Just in time educated. I only need to know what I need to know to take the next step. I've spent 20 years writing code. Explain quick. I'll get it. (I mean provide a reference to something that explains quickly of course). I'm happy to read the right book, but I don't want to read a book where I read the chapter introduction that explains what floopy floop is and then skip over the rest of the chapter with examples of floopy flooping (because now I get what it is). I also don't want to read a book that goes into too much detail with theoretical underpinnings or history. For example, the Jurafsky book seems like way more than I need: http://www.amazon.com/gp/product/0131873210. But I will read it if this is the right book to read. (It's also dang expensive!) I need the root node of the expedited learning tree here, if you will. Point me in the right direction and I'll be quite grateful. I'm expecting quite a lot of firehose drinking - I just need the right firehose. Second, what I need to do is take a single sentence, with a very reduced vocabulary, and get a grammar tree (sorry if this is the wrong terminology) that I can do something with. I know I could easily write this command line input style in c in a more conventional manner, but I need it to be way better than that. But I don't need a chatterbot either. What I'm doing needs to live in a constrained environment. I can't use Python (unfortunately). I can't ship with gigabytes of corpuses. I need any libraries I use to be in c/c++. If I have to write this myself, I will. Hopefully, it will be achievable considering the reduced problem set. Maybe, probably, that's just naive. If so, let me know. :-) Thanks in advance - Mike

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• MVC 2 Ajax.Beginform passes returned Html to javascript function

  - by Joe

  Hi, I have a small partial Create Person form in a page above a table of results. I want to be able to post the form to the server, which I can do no problem with ajax.Beginform. <% using (Ajax.BeginForm("Create", new AjaxOptions { OnComplete = "ProcessResponse" })) {%> <fieldset> <legend>Fields</legend> <div class="editor-label"> <%=Html.LabelFor(model => model.FirstName)%> </div> <div class="editor-field"> <%=Html.TextBoxFor(model => model.FirstName)%> <%=Html.ValidationMessageFor(model => model.FirstName)%> </div> <div class="editor-label"> <%=Html.LabelFor(model => model.LastName)%> </div> <div class="editor-field"> <%=Html.TextBoxFor(model => model.LastName)%> <%=Html.ValidationMessageFor(model => model.LastName)%> </div> <p> <input type="submit" /> </p> </fieldset> <% } %> Then in my controller I want to be able to post back a partial which is just a table row if the create is successful and append it to the table, which I can do easily with jquery. $('#personTable tr:last').after(data); However, if server validation fails I want to pass back my partial create person form with the validation errors and replace the existing Create Person form. I have tried returning a Json array Controller: return Json(new { Success = true, Html= this.RenderViewToString("PersonSubform",person) }); Javascript: var json_data = response.get_response().get_object(); with a pass/fail flag and the partial rendered as a string using the solition below but that doesnt render the mvc validation controls when the form fails. SO RenderPartialToString So, is there any way I can hand my javascript the out of the box PartialView("PersonForm") as its returned from my ajax.form? Can I pass some addition info as a Json array so I can tell if its pass or fail and maybe add a message? UPDATE I can now pass the HTML of a PartialView to my javascript but I need to pass some additional data pairs like ServerValidation : true/false and ActionMessage : "you have just created a Person Bill". Ideally I would pass a Json array rather than hidden fields in my partial. function ProcessResponse(response) { var html = response.get_data(); $("#campaignSubform").html(html); } Many thanks in advance

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• Game loop and time tracking

  - by David Brown

  Maybe I'm just an idiot, but I've been trying to implement a game loop all day and it's just not clicking. I've read literally every article I could find on Google, but the problem is that they all use different timing mechanisms, which makes them difficult to apply to my particular situation (some use milliseconds, other use ticks, etc). Basically, I have a Clock object that updates each time the game loop executes. internal class Clock { public static long Timestamp { get { return Stopwatch.GetTimestamp(); } } public static long Frequency { get { return Stopwatch.Frequency; } } private long _startTime; private long _lastTime; private TimeSpan _totalTime; private TimeSpan _elapsedTime; /// <summary> /// The amount of time that has passed since the first step. /// </summary> public TimeSpan TotalTime { get { return _totalTime; } } /// <summary> /// The amount of time that has passed since the last step. /// </summary> public TimeSpan ElapsedTime { get { return _elapsedTime; } } public Clock() { Reset(); } public void Reset() { _startTime = Timestamp; _lastTime = 0; _totalTime = TimeSpan.Zero; _elapsedTime = TimeSpan.Zero; } public void Tick() { long currentTime = Timestamp; if (_lastTime == 0) _lastTime = currentTime; _totalTime = TimestampToTimeSpan(currentTime - _startTime); _elapsedTime = TimestampToTimeSpan(currentTime - _lastTime); _lastTime = currentTime; } public static TimeSpan TimestampToTimeSpan(long timestamp) { return TimeSpan.FromTicks( (timestamp * TimeSpan.TicksPerSecond) / Frequency); } } I based most of that on the XNA GameClock, but it's greatly simplified. Then, I have a Time class which holds various times that the Update and Draw methods need to know. public class Time { public TimeSpan ElapsedVirtualTime { get; internal set; } public TimeSpan ElapsedRealTime { get; internal set; } public TimeSpan TotalVirtualTime { get; internal set; } public TimeSpan TotalRealTime { get; internal set; } internal Time() { } internal Time(TimeSpan elapsedVirtualTime, TimeSpan elapsedRealTime, TimeSpan totalVirutalTime, TimeSpan totalRealTime) { ElapsedVirtualTime = elapsedVirtualTime; ElapsedRealTime = elapsedRealTime; TotalVirtualTime = totalVirutalTime; TotalRealTime = totalRealTime; } } My main class keeps a single instance of Time, which it should constantly update during the game loop. So far, I have this: private static void Loop() { do { Clock.Tick(); Time.TotalRealTime = Clock.TotalTime; Time.ElapsedRealTime = Clock.ElapsedTime; InternalUpdate(Time); InternalDraw(Time); } while (!_exitRequested); } The real time properties of the time class turn out great. Now I'd like to get a proper update/draw loop working so that the state is updated a variable number of times per frame, but at a fixed timestep. At the same time, the Time.TotalVirtualTime and Time.ElapsedVirtualTime should be updated accordingly. In addition, I intend for this to support multiplayer in the future, in case that makes any difference to the design of the game loop. Any tips or examples on how I could go about implementing this (aside from links to articles)?

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• Enable button based on TextBox value (WPF)

  - by zendar

  This is MVVM application. There is a window and related view model class. There is TextBox, Button and ListBox on form. Button is bound to DelegateCommand that has CanExecute function. Idea is that user enters some data in text box, presses button and data is appended to list box. I would like to enable command (and button) when user enters correct data in TextBox. Things work like this now: CanExecute() method contains code that checks if data in property bound to text box is correct. Text box is bound to property in view model UpdateSourceTrigger is set to PropertyChanged and property in view model is updated after each key user presses. Problem is that CanExecute() does not fire when user enters data in text box. It doesn't fire even when text box lose focus. How could I make this work? Edit: Re Yanko's comment: Delegate command is implemented in MVVM toolkit template and when you create new MVVM project, there is Delegate command in solution. As much as I saw in Prism videos this should be the same class (or at least very similar). Here is XAML snippet: ... <UserControl.Resources> <views:CommandReference x:Key="AddObjectCommandReference" Command="{Binding AddObjectCommand}" /> </UserControl.Resources> ... <TextBox Text="{Binding ObjectName, UpdateSourceTrigger=PropertyChanged}"> </TextBox> <Button Command="{StaticResource AddObjectCommandReference}">Add</Button> ... View model: // Property bound to textbox public string ObjectName { get { return objectName; } set { objectName = value; OnPropertyChanged("ObjectName"); } } // Command bound to button public ICommand AddObjectCommand { get { if (addObjectCommand == null) { addObjectCommand = new DelegateCommand(AddObject, CanAddObject); } return addObjectCommand; } } private void AddObject() { if (ObjectName == null || ObjectName.Length == 0) return; objectNames.AddSourceFile(ObjectName); OnPropertyChanged("ObjectNames"); // refresh listbox } private bool CanAddObject() { return ObjectName != null && ObjectName.Length > 0; } As I wrote in the first part of question, following things work: property setter for ObjectName is triggered on every keypress in textbox if I put return true; in CanAddObject(), command is active (button to) It looks to me that binding is correct. Thing that I don't know is how to make CanExecute() fire in setter of ObjectName property from above code. Re Ben's and Abe's answers: CanExecuteChanged() is event handler and compiler complains: The event 'System.Windows.Input.ICommand.CanExecuteChanged' can only appear on the left hand side of += or -= there are only two more members of ICommand: Execute() and CanExecute() Do you have some example that shows how can I make command call CanExecute(). I found command manager helper class in DelegateCommand.cs and I'll look into it, maybe there is some mechanism that could help. Anyway, idea that in order to activate command based on user input, one needs to "nudge" command object in property setter code looks clumsy. It will introduce dependencies and one of big points of MVVM is reducing them. Is it possible to solve this problem by using dependency properties?

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• On REST: WADL or not IDL, is the following approach right ?

  - by redben

  This question is a bit long, please bear with me. In REST, i think we should not need WADL or any IDL. But rather something that would implicitly cover its concept. The way I think about it is when we (humans) surf the Web, when we go to a web site for the first time, we don't know what services it provides. You discover those on the html home page (or a sitemap page in a help section) or maybe just the main menu on the home page. If you make an analogy, the homepage or site map to us humans is what WSDL is to WS-* or what WADL could be to a REST service. Only that its just like any other html content. I think that in REST the following is a good way to do things, respecting the HATEOS paradigm. Have a top level (or default) resource that lists links to your other resources. For a library example, say RestLibrary.com/ it could be something like: <root xmlns:lib="http://librarystandards.com/libraryml"> <resource class="lib:book"> <link type="application/vnd.libraryml+xml" template="mylib.com/book/{isbn}" /> <link type="application/vnd.libraryml+xml" rel="add" href="mylib.com/book" method="POST" /> <link type="application/vnd.libraryml+xml" rel="update" template="mylib.com/book/{isbn}" method="PUT" /> </resource> <resource class="lib:bookList"> <link template="mylib.com/book?keywords={keywords}" type="application/vnd.openlibrary+xml" rel="search" /> </resource> </root> Note that it is assumed that the media type "application/vnd.libraryml+xml" is a defined standard or (may be just proprietary vocabulary) named libraryml. Also, the client should be able to understand this "homepage" resource (elements root, resource and link). This is the part that could be used instead of WADL : an Abstract vocabulary that should be understandable by any client. You could use an existing standard like Atom for example. But the main idea is to have an abstract vocabulary understandable by any client. Why not WADL then ? well wadl is only for service discovery. The idea here is to have an light abstract vocabulary that would serve as a base for hypermedia. A "root" vocabulary. Like in owl we have owl:thing...etc Now if the client knows the "libraryml" standard it can follow the links to the things it understands (after parsing the media type properties and xmlns). If not, it just won't. When i can't understand how to deal with something in REST architecture i tend to see how we Humans do it in the Web. In the Web, we have the Generic language that is HTML that enables site builders to deliver any specific content, regardless of its meaning to the client (the user), Browsers understand HTML but not the "meaning" of its content. It is the user that understands the (domain specific) content. If i go to say QuantumPhysics.org, my browser can render the home page (it is just html after all) and i can read the home page. If i understand quantum then fine i can continue browsing. If i don't i just get out (unless i want to learn the hardway :) ) In the RetsLibrary.com example the client app is just like me+my browser on QuantumPhysics.org. the media type "application/vnd.libraryml+xml" is quantum physics (knowledge). http is http in both examples. Now HTML of QuantumPhysics.org is in RestLibrary.com is XML + that tiny little abstract vocabulary (root resource and link, that you could replace with something like Atom). So does this approach have any value ? don't we need a root tiny hyper-vocabulary so we can succeed with hypermedia and the "initial URI" concept ? edit Yeah why not RDF as the root vocabulary !

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• Issue with Autofac 2 and MVC2 using HttpRequestScoped

  - by Page Brooks

  I'm running into an issue with Autofac2 and MVC2. The problem is that I am trying to resolve a series of dependencies where the root dependency is HttpRequestScoped. When I try to resolve my UnitOfWork (which is Disposable), Autofac fails because the internal disposer is trying to add the UnitOfWork object to an internal disposal list which is null. Maybe I'm registering my dependencies with the wrong lifetimes, but I've tried many different combinations with no luck. The only requirement I have is that MyDataContext lasts for the entire HttpRequest. I've posted a demo version of the code for download here. Autofac modules are set up in web.config Global.asax.cs protected void Application_Start() { string connectionString = "something"; var builder = new ContainerBuilder(); builder.Register(c => new MyDataContext(connectionString)).As<IDatabase>().HttpRequestScoped(); builder.RegisterType<UnitOfWork>().As<IUnitOfWork>().InstancePerDependency(); builder.RegisterType<MyService>().As<IMyService>().InstancePerDependency(); builder.RegisterControllers(Assembly.GetExecutingAssembly()); _containerProvider = new ContainerProvider(builder.Build()); IoCHelper.InitializeWith(new AutofacDependencyResolver(_containerProvider.RequestLifetime)); ControllerBuilder.Current.SetControllerFactory(new AutofacControllerFactory(ContainerProvider)); AreaRegistration.RegisterAllAreas(); RegisterRoutes(RouteTable.Routes); } AutofacDependencyResolver.cs public class AutofacDependencyResolver { private readonly ILifetimeScope _scope; public AutofacDependencyResolver(ILifetimeScope scope) { _scope = scope; } public T Resolve<T>() { return _scope.Resolve<T>(); } } IoCHelper.cs public static class IoCHelper { private static AutofacDependencyResolver _resolver; public static void InitializeWith(AutofacDependencyResolver resolver) { _resolver = resolver; } public static T Resolve<T>() { return _resolver.Resolve<T>(); } } UnitOfWork.cs public interface IUnitOfWork : IDisposable { void Commit(); } public class UnitOfWork : IUnitOfWork { private readonly IDatabase _database; public UnitOfWork(IDatabase database) { _database = database; } public static IUnitOfWork Begin() { return IoCHelper.Resolve<IUnitOfWork>(); } public void Commit() { System.Diagnostics.Debug.WriteLine("Commiting"); _database.SubmitChanges(); } public void Dispose() { System.Diagnostics.Debug.WriteLine("Disposing"); } } MyDataContext.cs public interface IDatabase { void SubmitChanges(); } public class MyDataContext : IDatabase { private readonly string _connectionString; public MyDataContext(string connectionString) { _connectionString = connectionString; } public void SubmitChanges() { System.Diagnostics.Debug.WriteLine("Submiting Changes"); } } MyService.cs public interface IMyService { void Add(); } public class MyService : IMyService { private readonly IDatabase _database; public MyService(IDatabase database) { _database = database; } public void Add() { // Use _database. } } HomeController.cs public class HomeController : Controller { private readonly IMyService _myService; public HomeController(IMyService myService) { _myService = myService; } public ActionResult Index() { // NullReferenceException is thrown when trying to // resolve UnitOfWork here. // Doesn't always happen on the first attempt. using(var unitOfWork = UnitOfWork.Begin()) { _myService.Add(); unitOfWork.Commit(); } return View(); } public ActionResult About() { return View(); } }

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• Summer Programming Plans

  - by Gabe

  I've wanted to start "hacking" for many months now. But I put it off in favor of school and other things. Now, though, I'm free for the summer and want to learn as much as I can. I have a rough idea of what I want to try my hand at, but need some guidance as to what specifically - and how - I should learn. This is my plan so far: 1) Get good at programming in general. I plan to read up on how to think/work like a programmer. I'm waiting for the Pragmatic Programmer to arrive, which will be the first book I read. Q: What other books/ebooks should I look at? What more can I do here? 2) Learn/Improve at HTML/CSS. My first project will be to make a personal website/blog for myself using HTML and CSS. ----Then I hope to write/design articles like Dustin Curtis. After I finish this (and learn a programming language) I'll try to create user-based a user-focused website. Q: It's my understanding that just trying to design/manage websites is a good way to learn/improve at HTML/CSS. Is that all correct? 3) Try music development. This might be a sort of stretch for stackoverflow, but I'm interested in mixing/making techno songs. (Think Justice, or Daft Punk, or MSTRKRFT.) Q: I have a Mac. Any ideas on how I could start/learn music making? Any programs I should download, for instance? 4) My main goal: Learning a web development language/framework. I'm a year into learning/using C++. But what I really want to do is develop websites and web apps. I've searched online, and there seems to be great debate over which language/framework to learn first (and which is best). I think I've narrowed it down to three: Ruby (Rails), Python (Django), and PHP (?). Q #1: Which should I learn and use first? (Reasons?) Q #2: One reason I was leaning towards PHP is that I'm taking a PHP development course next semester. Learning it now would make that course easy. If PHP was not the answer to Q #1, is it worth learning both? Or, would it be better to just focus on PHP for this summer and next semester, and then transition thereafter to a better language? 5) iPhone/iPad Programming (Maybe). I've a number of simple, useful app ideas that I'd like to eventually get too. I just bought a Mac, as well as a few app development books. Q #1: Am I spreading myself thin trying to learn all of the above, and objective-C? Q #2: How much harder/easier is objective-C compared to the above languages? Also, how easy is it to learn obj-C after learning a web development language (and some C++)? Q #3: Yes or no? Should I go for it, or just keeep with #1-4 for now? Also: If you have any tips on how I should learn (or how you learned to hack), I'm all ears. I'd be especially interested in how you planned out learning: did you just hack whenever you felt like it, or did you "study" the language a few hours a day, or something else? Thanks so much, guys.

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• Strange WCF Error - IIS hosted - context being aborted

  - by RandomNoob

  I have a WCF service that does some document conversions and returns the document to the caller. When developing locally on my local dev server, the service is hosted on ASP.NET Development server, a console application invokes the operation and executes within seconds. When I host the service in IIS via a .svc file, two of the documents work correctly, the third one bombs out, it begins to construct the word document using the OpenXml Sdk, but then just dies. I think this has something to do with IIS, but I cannot put my finger on it. There are a total of three types of documents I generate. In a nutshell this is how it works SQL 2005 DB/IBM DB2 - WCF Service written by other developer to expose data. This service only has one endpoint using basicHttpBinding My Service invokes his service, gets the relevant data, uses the Open Xml Sdk to generate a Microsoft Word Document, saves it on a server and returns the path to the user. The word documents are no bigger than 100KB. I am also using basicHttpBinding although I have tried wsHttpBinding with the same results. What is amazing is how fast it is locally, and even more that two of the documents generate just fine, its the third document type that refuses to work. To the error message: An error occured while receiving the HTTP Response to http://myservername.mydomain.inc/MyService/Service.Svc. This could be due to the service endpoint binding not using the HTTP Protocol. This could also be due to an HTTP request context being aborted by the server (possibly due to the server shutting down). See server logs for more details. I have spent the last 2 days trying to figure out what is going on, I have tried everything, including changing the maxReceivedMessageSize, maxBufferSize, maxBufferPoolSize, etc etc to large values, I even included: <httpRuntime maxRequestLength="2097151" executionTimeout="120"/> To see maybe if IIS was choking because of that. Programatically the service does nothing special, it just constructs the word documents from the data using the Open Xml Sdk and like I said, locally all 3 documents work when invoked via a console app running locally on the asp.net dev server, i.e. http://localhost:3332/myService.svc When I host it on IIS and I try to get a Windows Forms application to invoke it, I get the error. I know you will ask for logs, so yes I have logging enabled on my Host. And there is no error in the logs, I am logging everything. Basically I invoke two service operations written by another developer. MyOperation calls - HisOperation1 and then HisOperation2, both of those calls give me complex types. I am going to look at his code tomorrow, because he is using LINQ2SQL and there may be some funny business going on there. He is using a variety of collections etc, but the fact that I can run the exact same document, lets call it "Document 3" within seconds when the service is being hosted locally on ASP WebDev Server is what is most odd, why would it run on scaled down Cassini and blow up on IIS? From the log it seems, after calling HisOperation1 and HisOperation2 the service just goes into la-la land dies, there is a application pool (w3wp.exe) error in the Windows Event Log. Faulting application w3wp.exe, version 6.0.3790.1830, stamp 42435be1, faulting module kernel32.dll, version 5.2.3790.3311, stamp 49c5225e, debug? 0, fault address 0x00015dfa. It's classified as .NET 2.0 Runtime error. Any help is appreciated, the lack of sleep is getting to me. Help me Obi-Wan Kenobi, you're my only hope.

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• Oracle performance problem

  - by jreid42

  We are using an Oracle 11G machine that is very powerful; has redundant storage etc. It's a beast from what I have been told. We just got this DB for a tool that when I first came on as a coop had like 20 people using, now its upwards of 150 people. I am the only one working on it :( We currently have a system in place that distributes PERL scripts across our entire data center essentially giving us a sort of "grid" computing power. The Perl scripts run a sort of simulation and report back the results to the database. They do selects / inserts. The load is not very high for each script but it could be happening across 20-50 systems at the same time. We then have multiple data centers and users all hitting the same database with this same approach. Our main problem with this is that our database is getting overloaded with connections and having to drop some. We sometimes have upwards of 500 connections. These are old perl scripts and they do not handle this well. Essentially they fail and the results are lost. I would rather avoid having to rewrite a lot of these as they are poorly written, and are a headache to even look at. The database itself is not overloaded, just the connection overhead is too high. We open a connection, make a quick query and then drop the connection. Very short connections but many of them. The database team has basically said we need to lower the number of connections or they are going to ignore us. Because this is distributed across our farm we cant implement persistent connections. I do this with our webserver; but its on a fixed system. The other ones are perl scripts that get opened and closed by the distribution tool and thus arent always running. What would be my best approach to resolving this issue? The scripts themselves can wait for a connection to be open. They do not need to act immediately. Some sort of queing system? I've been suggested to set up a few instances of a tool called "SQL Relay". Maybe one in each data center. How reliable is this tool? How good is this approach? Would it work for what we need? We could have one for each data center and relay requests through it to our main database, keeping a pipeline of open persistent connections? Does this make sense? Is there any other suggestions you can make? Any ideas? Any help would be greatly appreciated. Sadly I am just a coop student working for a very big company and somehow all of this has landed all on my shoulders (there is literally nobody to ask for help; its a hardware company, everybody is hardware engineers, and the database team is useless and in India) and I am quite lost as what the best approach would be? I am extremely overworked and this problem is interfering with on going progress and basically needs to be resolved as quickly as possible; preferably without rewriting the whole system, purchasing hardware (not gonna happen), or shooting myself in the foot. HELP LOL!

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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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• Replace JBoss error page with Axis2 fault XML response

  - by Dario

  I'm developing a webservice with Axis2 1.4.1 on JBoss 4.2.3/Tomcat 5.5.27 and Java 1.5.0 (15-b04). It works flawlessly but when an exception happens I get a JBoss error 500 HTML page instead of an Axis2 XML/SOAP fault. This behavoir is vexing, because it difficults to handle errors in the webservice client or in SoapUI while developing. Can I change this to get the SOAP fault? Maybe it's just an Axis2 or JBoss parameter, but I didn't find any clue about. EDIT: Here goes the new stacktrace: [ERROR] WSDoAllReceiver: security processing failed org.apache.axis2.AxisFault: WSDoAllReceiver: security processing failed at org.apache.rampart.handler.WSDoAllReceiver.processBasic(WSDoAllReceiver.java:214) at org.apache.rampart.handler.WSDoAllReceiver.processMessage(WSDoAllReceiver.java:86) at org.apache.rampart.handler.WSDoAllHandler.invoke(WSDoAllHandler.java:72) at org.apache.axis2.engine.Phase.invoke(Phase.java:317) at org.apache.axis2.engine.AxisEngine.invoke(AxisEngine.java:264) at org.apache.axis2.engine.AxisEngine.receive(AxisEngine.java:163) at org.apache.axis2.transport.http.HTTPTransportUtils.processHTTPPostRequest(HTTPTransportUtils.java:275) at org.apache.axis2.transport.http.AxisServlet.doPost(AxisServlet.java:133) at javax.servlet.http.HttpServlet.service(HttpServlet.java:647) at javax.servlet.http.HttpServlet.service(HttpServlet.java:729) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:269) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:188) at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:213) at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:172) at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:127) at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:117) at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:108) at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:174) at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:875) at org.apache.coyote.http11.Http11BaseProtocol$Http11ConnectionHandler.processConnection(Http11BaseProtocol.java:665) at org.apache.tomcat.util.net.PoolTcpEndpoint.processSocket(PoolTcpEndpoint.java:528) at org.apache.tomcat.util.net.LeaderFollowerWorkerThread.runIt(LeaderFollowerWorkerThread.java:81) at org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool.java:689) at java.lang.Thread.run(Thread.java:595) Caused by: org.apache.ws.security.WSSecurityException: The security token could not be authenticated or authorized at org.apache.ws.security.processor.UsernameTokenProcessor.handleUsernameToken(UsernameTokenProcessor.java:155) at org.apache.ws.security.processor.UsernameTokenProcessor.handleToken(UsernameTokenProcessor.java:53) at org.apache.ws.security.WSSecurityEngine.processSecurityHeader(WSSecurityEngine.java:311) at org.apache.ws.security.WSSecurityEngine.processSecurityHeader(WSSecurityEngine.java:228) at org.apache.rampart.handler.WSDoAllReceiver.processBasic(WSDoAllReceiver.java:211) ... 23 more [ERROR] Servlet.service() para servlet AxisServlet lanzó excepción java.lang.NullPointerException at org.apache.rampart.RampartMessageData.<init>(RampartMessageData.java:308) at org.apache.rampart.MessageBuilder.build(MessageBuilder.java:61) at org.apache.rampart.handler.RampartSender.invoke(RampartSender.java:64) at org.apache.axis2.engine.Phase.invoke(Phase.java:317) at org.apache.axis2.engine.AxisEngine.invoke(AxisEngine.java:264) at org.apache.axis2.engine.AxisEngine.sendFault(AxisEngine.java:520) at org.apache.axis2.transport.http.AxisServlet.handleFault(AxisServlet.java:416) at org.apache.axis2.transport.http.AxisServlet.processAxisFault(AxisServlet.java:379) at org.apache.axis2.transport.http.AxisServlet.doPost(AxisServlet.java:167) at javax.servlet.http.HttpServlet.service(HttpServlet.java:647) at javax.servlet.http.HttpServlet.service(HttpServlet.java:729) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:269) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:188) at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:213) at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:172) at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:127) at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:117) at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:108) at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:174) at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:875) at org.apache.coyote.http11.Http11BaseProtocol$Http11ConnectionHandler.processConnection(Http11BaseProtocol.java:665) at org.apache.tomcat.util.net.PoolTcpEndpoint.processSocket(PoolTcpEndpoint.java:528) at org.apache.tomcat.util.net.LeaderFollowerWorkerThread.runIt(LeaderFollowerWorkerThread.java:81) at org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool.java:689) at java.lang.Thread.run(Thread.java:595) EDIT 2: After giving the bounty I found that I was wrong about 1.2.9-SNAPSHOT version of Axiom. I built it again, made sure the jars where correctly copied to lib directory and it worked! Finally, it was an Axiom bug, as said in the links provided by Vineet. Thanks!

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• What git branching models actually work - the final question

  - by UncleCJ

  In our company we have successfully deployed git and we are currently using a simple trunk/release/hotfixes branching model. However, this has it's problems, I have some key issues of confusion in the community which would be awesome to have answered here. Maybe my hopes for an Alexander stroke are too great, quite possibly I'll decompose this question into more manageable issues, but here's my first shot. Workflows / branching models - below are the three main descriptions of this I have seen, but they are partially contradicting each other or don't go far enough to sort out the subsequent issues we've run into (as described below). Thus our team so far defaults to not so great solutions. Are you doing something better? gitworkflows(7) Manual Page (nvie) A successful Git branching model (reinh) A Git Workflow for Agile Teams Merging vs rebasing (tangled vs sequential history) - the bids on this are as confusing as it gets. Should one pull --rebase or wait with merging back to the mainline until your task is finished? Personally I lean towards merging since this preserves a visual illustration of on which base a task was started and finished, and I even prefer merge --no-ff for this purpose. It has other drawbacks however. Also many haven't realized the useful property of merging - that it isn't commutative (merging a topic branch into master does not mean merging master into the topic branch). I am looking for a natural workflow - sometimes mistakes happen because our procedures don't capture a specific situation with simple rules. For example a fix needed for earlier releases should of course be based sufficiently downstream to be possible to merge upstream into all branches necessary (is the usage of these terms clear enough?). However it happens that a fix makes it into the master before the developer realizes it should have been placed further downstream, and if that is already pushed (even worse, merged or something based on it) then the option remaining is cherry-picking, with it's associated perils... What simple rules like such do you use? Also in this is included the awkwardness of one topic branch necessarily excluding other topic branches (assuming they are branched from a common baseline). Developers don't want to finish a feature to start another one feeling like the code they just wrote is not there anymore How to avoid creating merge conflicts (due to cherry-pick)? What seems like a sure way to create a merge conflict is to cherry-pick between branches, they can never be merged again? Would applying the same commit in revert (how to do this?) in either branch possibly solve this situation? This is one reason I do not dare to push for a largely merge-based workflow. How to decompose into topical branches? - We realize that it would be awesome to assemble a finished integration from topic branches, but often work by our developers is not clearly defined (sometimes as simple as "poking around") and if some code has already gone into a "misc" topic, it can not be taken out of there again, according to the question above? How do you work with defining/approving/graduating/releasing your topic branches? Proper procedures like code review and graduating would of course be lovely, but we simply cannot keep things untangled enough to manage this - any suggestions? integration branches, illustration please? Vote and comment as much as you'd like, I'll try to keep the issue page clear and informative enough. Thanks! Below is a list of related topics on stackoverflow I have checked out: What are some good strategies to allow deployed applications to be hotfixable? Workflow description for git usage for in-house development Git workflow for corporate Linux kernel development How do you maintain development code and production code? (thanks for this PDF!) git releases management Git Cherry-pick vs Merge Workflow How to cherry-pick multiple commits How do you merge selective files with git-merge? How to cherry pick a range of commits and merge into another branch ReinH Git Workflow git workflow for making modifications you’ll never push back to origin Cherry-pick a merge Proper Git workflow for combined OS and Private code? Maintaining Project with Git Why cant Git merge file changes with a modified parent/master. Git branching / rebasing good practices When will "git pull --rebase" get me in to trouble?

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• Deploying an HttpHandler web service

  - by baron

  I am trying to build a webservice that manipulates http requests POST and GET. Here is a sample: public class CodebookHttpHandler: IHttpHandler { public void ProcessRequest(HttpContext context) { if (context.Request.HttpMethod == "POST") { //DoHttpPostLogic(); } else if (context.Request.HttpMethod == "GET") { //DoHttpGetLogic(); } } ... public void DoHttpPostLogic() { ... } public void DoHttpGetLogic() { ... } I need to deploy this but I am struggling how to start. Most online references show making a website, but really, all I want to do is respond when an HttpPost is sent. I don't know what to put in the website, just want that code to run. Edit: I am following this site as its exactly what I'm trying to do. I have the website set up, I have the code for the handler in a .cs file, i have edited the web.config to add the handler for the file extension I need. Now I am at the step 3 where you tell IIS about this extension and map it to ASP.NET. Also I am using IIS 7 so interface is slightly different than the screenshots. This is the problem I have: 1) Go to website 2) Go to handler mappings 3) Go Add Script Map 4) request path - put the extension I want to handle 5) Executable- it seems i am told to set aspnet_isapi.dll here. Maybe this is incorrect? 6) Give name 7) Hit OK button: Add Script Map Do you want to allow this ISAPI extension? Click "Yes" to add the extension with an "Allowed" entry to the ISAPI and CGI Restrictions list or to update an existing extension entry to "Allowed" in the ISAPI and CGI Restrictions list. Yes No Cancel 8) Hit Yes Add Script Map The specified module required by this handler is not in the modules list. If you are adding a script map handler mapping, the IsapiModule or the CgiModule must be in the modules list. OK edit 2: Have just figured out that that managed handler had something to do with handlers witten in managed code, script map was to help configuring an executable and module mapping to work with http Modules. So I should be using option 1 - Add Managed Handler. See: http://yfrog.com/11managedhandlerp I know what my request path is for the file extension... and I know name (can call it whatever I like), so it must be the Type field I am struggling with. In the applications folder (in IIS) so far I just have the MyHandler.cs and web.config (Of course also a file with the extension I am trying to create the handler for!) edit3: progress So now I have the code and the web.config set up I test to see If I can browse to the filename.CustomExtension file: HTTP Error 404.3 - Not Found The page you are requesting cannot be served because of the extension configuration. If the page is a script, add a handler. If the file should be downloaded, add a MIME map. So in IIS7 I go to Handler Mappings and add it in. See this MSDN example, it is exactly what I am trying to follow The class looks like this: using System.Web; namespace HandlerAttempt2 { public class MyHandler : IHttpHandler { public MyHandler() { //TODO: Add constructor logic here } public void ProcessRequest(HttpContext context) { var objResponse = context.Response; objResponse.Write("<html><body><h1>It just worked"); objResponse.Write("</body></html>"); } public bool IsReusable { get { return true; } } } } I add the Handler in as follows: Request path: *.whatever Type: MyHandler (class name - this appears correct as per example!) Name: whatever Try to browse to the custom file again (this is in app pool as Integrated): HTTP Error 500.21 - Internal Server Error Handler "whatever" has a bad module "ManagedPipelineHandler" in its module list Try to browse to the custom file again (this is in app pool as CLASSIC): HTTP Error 404.17 - Not Found The requested content appears to be script and will not be served by the static file handler.

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• FMOD.net streaming, callback and exinfo parameters

  - by Tesserex

  I posted a question on gamedev about how to play nsf files (NES console music) in FMOD. It didn't get any results, but since then I made some progress. I decided that the easiest method was just to compile an existing player into a dll and then call it from C# to populate my buffer. The problem now is getting it to sound right, and making sure all my paremeters are correct. Here are the facts so far: The nsf dll is dealing with shorts, so the data is PCM16. The sample nsf I'm using has a playback rate of 60 Hz. Just for playing around now, I'm using a frequency of 48000. Based on 2 and 3, the dll calculates a necessary buffer size of 48000 / 60hz = 800. This means it will render 800 shorts worth of buffer for every simulated NES frame. I've so far got my C# code to play the nsf, at the correct pitch and tempo, but it's very grainy / fuzzy, which I'm attributing to the fact that the FMOD read callback is giving a data length of 1600, whereas I should be expecting 800. I've tried playing around with all the numbers and it either crashes, or the music changes pitch, tempo, or both. Here's some of my C# code: uint channels = 1, frequency = 48000; FMOD.MODE mode = (FMOD.MODE.DEFAULT | FMOD.MODE.OPENUSER | FMOD.MODE.LOOP_NORMAL); FMOD.Sound sound = new FMOD.Sound(); FMOD.CREATESOUNDEXINFO ex = new FMOD.CREATESOUNDEXINFO(); ex.cbsize = Marshal.SizeOf(ex); ex.fileoffset = 0; ex.format = FMOD.SOUND_FORMAT.PCM16; // does this even matter? It doesn't change my results as long as it's long enough for one update ex.length = frequency; ex.numchannels = (int)channels; ex.defaultfrequency = (int)frequency; ex.pcmreadcallback = pcmreadcallback; ex.dlsname = null; // eventually I will calculate this with frequency / nsf hz, but I'm just testing for now ex.decodebuffersize = 800; // from the dll load_nsf_file("file.nsf", 8, (int)frequency); // 8 is the track number to play var result = system.createSound( (string)null, (mode | FMOD.MODE.CREATESTREAM), ref ex, ref sound); channel = new FMOD.Channel(); result = system.playSound(FMOD.CHANNELINDEX.FREE, sound, false, ref channel); private FMOD.RESULT PCMREADCALLBACK(IntPtr soundraw, IntPtr data, uint datalen) { // from the dll process_buffer(data, (int)800); // if I use datalen, it usually crashes (I can't get datalen to = 800 safely) return FMOD.RESULT.OK; } So here are some of my questions: What is the relationship between exinfo.decodebuffersize, frequency, and the datalen parameter of the read callback? With this code sample, it's coming in as 3200. I don't know where that factor of 4 between it and the decodebuffersize comes from. Is datalen in the callback referring to number of bytes, or shorts? The process_buffer function takes a short array and its length. I would expect fmod is talking about shorts as well because I told it PCM16. Maybe my playback quality is bad for some totally different reason. If so I have no idea where to begin solving that. Any ideas there?

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• PLPGSQL array assignment not working, "array subscript in assignment must not be null"

  - by Koen Schmeets

  Hello there, When assigning mobilenumbers to a varchar[] in a loop through results it gives me the following error: "array subscript in assignment must not be null" Also, i think the query that joins member uuids, and group member uuids, into one, grouped on the user_id, i think it can be done better, or maybe this is even why it is going wrong in the first place! Any help is very appreciated.. Thank you very much! CREATE OR REPLACE FUNCTION create_membermessage(in_company_uuid uuid, in_user_uuid uuid, in_destinationmemberuuids uuid[], in_destinationgroupuuids uuid[], in_title character varying, in_messagecontents character varying, in_timedelta interval, in_messagecosts numeric, OUT out_status integer, OUT out_status_description character varying, OUT out_value VARCHAR[], OUT out_trigger uuid[]) RETURNS record LANGUAGE plpgsql AS $$ DECLARE temp_count INTEGER; temp_costs NUMERIC; temp_balance NUMERIC; temp_campaign_uuid UUID; temp_record RECORD; temp_mobilenumbers VARCHAR[]; temp_destination_uuids UUID[]; temp_iterator INTEGER; BEGIN out_status := NULL; out_status_description := NULL; out_value := NULL; out_trigger := NULL; SELECT INTO temp_count COUNT(*) FROM costs WHERE costtype = 'MEMBERMESSAGE' AND company_uuid = in_company_uuid AND startdatetime < NOW() AND (enddatetime > NOW() OR enddatetime IS NULL); IF temp_count > 1 THEN out_status := 1; out_status_description := 'Invalid rows in costs table!'; RETURN; ELSEIF temp_count = 1 THEN SELECT INTO temp_costs costs FROM costs WHERE costtype = 'MEMBERMESSAGE' AND company_uuid = in_company_uuid AND startdatetime < NOW() AND (enddatetime > NOW() OR enddatetime IS NULL); ELSE SELECT INTO temp_costs costs FROM costs WHERE costtype = 'MEMBERMESSAGE' AND company_uuid IS NULL AND startdatetime < NOW() AND (enddatetime > NOW() OR enddatetime IS NULL); END IF; IF temp_costs != in_messagecosts THEN out_status := 2; out_status_description := 'Message costs have changed during sending of the message'; RETURN; ELSE SELECT INTO temp_balance balance FROM companies WHERE company_uuid = in_company_uuid; SELECT INTO temp_count COUNT(*) FROM users WHERE (user_uuid = ANY(in_destinationmemberuuids)) OR (user_uuid IN (SELECT user_uuid FROM targetgroupusers WHERE targetgroup_uuid = ANY(in_destinationgroupuuids)) ) GROUP BY user_uuid; temp_campaign_uuid := generate_uuid('campaigns', 'campaign_uuid'); INSERT INTO campaigns (company_uuid, campaign_uuid, title, senddatetime, startdatetime, enddatetime, messagetype, state, message) VALUES (in_company_uuid, temp_campaign_uuid, in_title, NOW() + in_timedelta, NOW() + in_timedelta, NOW() + in_timedelta, 'MEMBERMESSAGE', 'DRAFT', in_messagecontents); IF in_timedelta > '00:00:00' THEN ELSE IF temp_balance < (temp_costs * temp_count) THEN UPDATE campaigns SET state = 'INACTIVE' WHERE campaign_uuid = temp_campaign_uuid; out_status := 2; out_status_description := 'Insufficient balance'; RETURN; ELSE UPDATE campaigns SET state = 'ACTIVE' WHERE campaign_uuid = temp_campaign_uuid; UPDATE companies SET balance = (temp_balance - (temp_costs * temp_count)) WHERE company_uuid = in_company_uuid; SELECT INTO temp_destination_uuids array_agg(DISTINCT(user_uuid)) FROM users WHERE (user_uuid = ANY(in_destinationmemberuuids)) OR (user_uuid IN(SELECT user_uuid FROM targetgroupusers WHERE targetgroup_uuid = ANY(in_destinationgroupuuids))); RAISE NOTICE 'Array is %', temp_destination_uuids; FOR temp_record IN (SELECT u.firstname, m.mobilenumber FROM users AS u LEFT JOIN mobilenumbers AS m ON m.user_uuid = u.user_uuid WHERE u.user_uuid = ANY(temp_destination_uuids)) LOOP IF temp_record.mobilenumber IS NOT NULL AND temp_record.mobilenumber != '' THEN --THIS IS WHERE IT GOES WRONG temp_mobilenumbers[temp_iterator] := ARRAY[temp_record.firstname::VARCHAR, temp_record.mobilenumber::VARCHAR]; temp_iterator := temp_iterator + 1; END IF; END LOOP; out_status := 0; out_status_description := 'Message created successfully'; out_value := temp_mobilenumbers; RETURN; END IF; END IF; END IF; END$$;

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• WPF Combobox binding: can't change selection.

  - by SteveCav

  After wasting hours on this, following on the heels of my Last Problem, I'm starting to feel that Framework 4 is a master of subtle evil, or my PC is haunted. I have three comboboxes and a textbox on a WPF form, and I have an out-of-the-box Subsonic 3 ActiveRecord DAL. When I load this "edit record" form, the comboboxes fill correctly, they select the correct items, and the textbox has the correct text. I can change the TextBox text and save the record just fine, but the comboboxes CANNOT BE CHANGED. The lists drop down and highlight, but when you click on an item, the item selected stays the same. Here's my XAML: <StackPanel Orientation="Horizontal" Margin="10,10,0,0"> <TextBlock Width="80">Asset</TextBlock> <ComboBox Name="cboAsset" Width="180" DisplayMemberPath="AssetName" SelectedValuePath="AssetID" SelectedValue="{Binding AssetID}" ></ComboBox> </StackPanel> <StackPanel Orientation="Horizontal" Margin="10,10,0,0"> <TextBlock Width="80">Status</TextBlock> <ComboBox Name="cboStatus" Width="180" DisplayMemberPath="JobStatusDesc" SelectedValuePath="JobStatusID" SelectedValue="{Binding JobStatusID}" ></ComboBox> </StackPanel> <StackPanel Orientation="Horizontal" Margin="10,10,0,0"> <TextBlock Width="80">Category</TextBlock> <ComboBox Name="cboCategories" Width="180" DisplayMemberPath="CategoryName" SelectedValuePath="JobCategoryID" SelectedValue="{Binding JobCategoryID}" ></ComboBox> </StackPanel> <StackPanel Orientation="Horizontal" Margin="10,10,0,0"> <TextBlock Width="80">Reason</TextBlock> <TextBox Name="txtReason" Width="380" Text="{Binding Reason}"/> </StackPanel> Here are the relevant snips of my code (intJobID is passed in): SvcMgrDAL.Job oJob; IQueryable<SvcMgrDAL.JobCategory> oCategories = SvcMgrDAL.JobCategory.All().OrderBy(x => x.CategoryName); IQueryable<SvcMgrDAL.Asset> oAssets = SvcMgrDAL.Asset.All().OrderBy(x => x.AssetName); IQueryable<SvcMgrDAL.JobStatus> oStatus = SvcMgrDAL.JobStatus.All(); cboCategories.ItemsSource = oCategories; cboStatus.ItemsSource = oStatus; cboAsset.ItemsSource = oAssets; this.JobID = intJobID; oJob = SvcMgrDAL.Job.SingleOrDefault(x => x.JobID == intJobID); this.DataContext = oJob; Things I've tried: -Explicitly setting IsReadOnly="false" and IsSynchronizedWithCurrentItem="True" -Changing the combobox ItemSources from IQueryables to Lists. -Building my own Job object (plain vanilla entity class). -Every binding mode for the comboboxes. The Subsonic DAL doesn't implement INotifyPropertyChanged, but I don't see as it'd need to for simple binding like this. I just want to be able to pick something from the dropdown and save it. Comparing it with my last problem (link at the top of this message), I seem to have something really wierd with data sources going on. Maybe it's a Subsonic thing?

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• Real-time graphing in Java

  - by thodinc

  I have an application which updates a variable about between 5 to 50 times a second and I am looking for some way of drawing a continuous XY plot of this change in real-time. Though JFreeChart is not recommended for such a high update rate, many users still say that it works for them. I've tried using this demo and modified it to display a random variable, but it seems to use up 100% CPU usage all the time. Even if I ignore that, I do not want to be restricted to JFreeChart's ui class for constructing forms (though I'm not sure what its capabilities are exactly). Would it be possible to integrate it with Java's "forms" and drop-down menus? (as are available in VB) Otherwise, are there any alternatives I could look into? EDIT: I'm new to Swing, so I've put together a code just to test the functionality of JFreeChart with it (while avoiding the use of the ApplicationFrame class of JFree since I'm not sure how that will work with Swing's combo boxes and buttons). Right now, the graph is being updated immediately and CPU usage is high. Would it be possible to buffer the value with new Millisecond() and update it maybe twice a second? Also, can I add other components to the rest of the JFrame without disrupting JFreeChart? How would I do that? frame.getContentPane().add(new Button("Click")) seems to overwrite the graph. package graphtest; import java.util.Random; import javax.swing.JFrame; import org.jfree.chart.ChartFactory; import org.jfree.chart.ChartPanel; import org.jfree.chart.JFreeChart; import org.jfree.chart.axis.ValueAxis; import org.jfree.chart.plot.XYPlot; import org.jfree.data.time.Millisecond; import org.jfree.data.time.TimeSeries; import org.jfree.data.time.TimeSeriesCollection; public class Main { static TimeSeries ts = new TimeSeries("data", Millisecond.class); public static void main(String[] args) throws InterruptedException { gen myGen = new gen(); new Thread(myGen).start(); TimeSeriesCollection dataset = new TimeSeriesCollection(ts); JFreeChart chart = ChartFactory.createTimeSeriesChart( "GraphTest", "Time", "Value", dataset, true, true, false ); final XYPlot plot = chart.getXYPlot(); ValueAxis axis = plot.getDomainAxis(); axis.setAutoRange(true); axis.setFixedAutoRange(60000.0); JFrame frame = new JFrame("GraphTest"); frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); ChartPanel label = new ChartPanel(chart); frame.getContentPane().add(label); //Suppose I add combo boxes and buttons here later frame.pack(); frame.setVisible(true); } static class gen implements Runnable { private Random randGen = new Random(); public void run() { while(true) { int num = randGen.nextInt(1000); System.out.println(num); ts.addOrUpdate(new Millisecond(), num); try { Thread.sleep(20); } catch (InterruptedException ex) { System.out.println(ex); } } } } }

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• How to animate an non-closed path with CAShapeLayer?

  - by mystify

  On GitHub you can find an example for CAShapeLayer which animates an path. It animates a pentagon turning into a star. First: This works only in the iPhone simulator. OS 3.0 on the device shows serious bugs with this code. But I can't find anything wrong in there. However, I tried to animate an path which is not closed. To put it simply: A few straight lines. Is there anything special I must do to get this work properly on the device? - (void)loadView { UIView *appView = [[UIView alloc] initWithFrame:[[UIScreen mainScreen] bounds]]; appView.backgroundColor = [UIColor blackColor]; self.view = appView; [appView release]; rootLayer = [CALayer layer]; rootLayer.frame = self.view.bounds; [self.view.layer addSublayer:rootLayer]; //Pentagon Path pentagonPath = CGPathCreateMutable(); CGPathMoveToPoint(pentagonPath, nil, 10.0f, 270.0f); CGPathAddLineToPoint(pentagonPath, nil, 100.0f, 270.0f); CGPathAddLineToPoint(pentagonPath, nil, 110.0f, 270.0f); CGPathAddLineToPoint(pentagonPath, nil, 120.0f, 270.0f); CGPathAddLineToPoint(pentagonPath, nil, 130.0f, 270.0f); CGPathAddLineToPoint(pentagonPath, nil, 310.0f, 270.0f); //CGPathCloseSubpath(pentagonPath); //Star Path starPath = CGPathCreateMutable(); CGPathMoveToPoint(starPath, nil, 10.0f, 270.0f); CGPathAddLineToPoint(starPath, nil, 100.0f, 270.0f); CGPathAddLineToPoint(starPath, nil, 210.0f, 270.0f); CGPathAddLineToPoint(starPath, nil, 220.0f, 260.0f); CGPathAddLineToPoint(starPath, nil, 230.0f, 270.0f); CGPathAddLineToPoint(starPath, nil, 310.0f, 270.0f); //CGPathCloseSubpath(starPath); //Create Shape shapeLayer = [CAShapeLayer layer]; //shapeLayer.path = pentagonPath; UIColor *col = [UIColor colorWithWhite:0.9 alpha:1.0]; //shapeLayer.fillColor = col.CGColor; shapeLayer.strokeColor = col.CGColor; shapeLayer.lineWidth = 3.0f; // shapeLayer.contents = [UIImage imageNamed:@"test.png"]; shapeLayer.fillRule = kCAFillRuleEvenOdd; [rootLayer addSublayer:shapeLayer]; [self performSelector:@selector(startAnimation) withObject:nil afterDelay:1.0]; } -(void)startAnimation { CABasicAnimation *animation = [CABasicAnimation animationWithKeyPath:@"path"]; animation.duration = 2.0; animation.timingFunction = [CAMediaTimingFunction functionWithName:kCAMediaTimingFunctionEaseInEaseOut]; animation.repeatCount = 1e100f; animation.autoreverses = YES; animation.fromValue = (id)pentagonPath; animation.toValue = (id)starPath; [shapeLayer addAnimation:animation forKey:@"animatePath"]; } Note this lines, where I just make straight lines with a small peak which is animated: //Pentagon Path pentagonPath = CGPathCreateMutable(); CGPathMoveToPoint(pentagonPath, nil, 10.0f, 270.0f); CGPathAddLineToPoint(pentagonPath, nil, 100.0f, 270.0f); CGPathAddLineToPoint(pentagonPath, nil, 110.0f, 270.0f); CGPathAddLineToPoint(pentagonPath, nil, 120.0f, 270.0f); CGPathAddLineToPoint(pentagonPath, nil, 130.0f, 270.0f); CGPathAddLineToPoint(pentagonPath, nil, 310.0f, 270.0f); //CGPathCloseSubpath(pentagonPath); //Star Path starPath = CGPathCreateMutable(); CGPathMoveToPoint(starPath, nil, 10.0f, 270.0f); CGPathAddLineToPoint(starPath, nil, 100.0f, 270.0f); CGPathAddLineToPoint(starPath, nil, 210.0f, 270.0f); CGPathAddLineToPoint(starPath, nil, 220.0f, 260.0f); CGPathAddLineToPoint(starPath, nil, 230.0f, 270.0f); CGPathAddLineToPoint(starPath, nil, 310.0f, 270.0f); I don't want a closed and filled path, but only simple lines with some color and thickness. The nasty thing on the device is, that the first point seems to move towards the right side of the screen for no reason. On the simulator though, it works perfectly fine. Maybe something is wrong with this setup?

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• Push Trunk or Push Branch to Production

  - by coffeeaddict

  I'd like to get an idea of some processes on build process with Tortoise SVN. Primarily I'm wondering do you push: The Mainline Trunk A branch after QA has grabbed it into a working copy locally and tested the branch and then some build pushes that branch The problem I have is I work at a craphole (hey, it is what it is and I'm venting on stackoverflow, you better believe it..good way to relieve stress due to complete utter chaos) and we have no formal process for pushing anything. In fact even worse my boss directly codes against production. When I have changes, he pushes the mainline trunk. The problem becomes when I make database changes on our Dev database for lets say Branch A. Well...that breaks Branch B and C. I have like 4 projects going on at once! Why? Well, I will not get into that (chaos). So consequently I rename a table field, or add a field or whatever in SQL Server and walla, now my other branches have stale code pointing to previous field names. So what happens? I have to merge certain changes to this branch, to that branch, etc. It feels like a war zone. Finally, what happens is I try to only merge the minimum. Lets say I made DB changes for Branch A's code but now I had to jump back on Branch B's project. Well I need to merge "some" of A's changes over for those database changes so that B's code is not going to bomb out and is able to work with the new table changes. Finally boss pushes the mainline trunk to production. Now I get an email "you forgot to remove the hyperlink for this". That hyperlink was actually a feature I added in Branch A. But what he's talking about here is he just pushed the mainline trunk to production which now has my merged changes from Branch B and any database scripts for Branch A because remember I had some DB changes and if he pushes code, it's got to reflect those changes thus some partial database changes must also be pushed even if it's not related to this project. Well...I missed the hyperlink, so kill me. Maybe that's why we need a build process boss? (sorry, it's been a nightmare working here which is why this thread is getting so detailed). Anyway, obviously this is a nightmare. And he dictates almost everything. The only reason we have source control is because I've worked on hard core teams and that's the first thing you setup. Well there was none here. Problem is I can't dictate the structure..he does but he's never really used source control!! My God. So we have no QA. This is an e-commerce website. That's another huge issue. So consequently I'm expected to be perfect. That means mainline trunk needs to be perfect for whatever we're pushing, whatever branch feature. Is this luda? wtf do I do? I could go off on him after tying so many times tactfully to explain that we need a freakin build process (not just copy local mainline trunk to production!) but I've tried to push before and got yelled at. So I gave up on that. So it will help me tremendously to know how others are pushing their source from Tortoise to production. I was not the person pushing when I was on previous teams so really I'm not too versed in build processes. We are a fairly good size e-commerce site and get a couple millions hits a month.

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• Simple Observation in Django: How Can I Correctly Modify The `attrs` sent to __new__ of a Django Mod

  - by DGGenuine

  Hello, I'm a strong proponent of the observer pattern, and this is what I'd like to be able to do in my Django models.py: class AModel(Model): __metaclass__ = SomethingMagical @post_save(AnotherModel) @classmethod def observe_another_model_saved(klass, sender, instance, created, **kwargs): pass @pre_init('YetAnotherModel') @classmethod def observe_yet_another_model_initializing(klass, sender, *args, **kwargs): pass @post_delete('DifferentApp.SomeModel') @classmethod def observe_some_model_deleted(klass, sender, **kwargs): pass This would connect a signal with sender = the decorator's argument and receiver = the decorated method. Right now my signal connection code all exists in __init__.py which is okay, but a little unmaintainable. I want this code all in one place, the models.py file. Thanks to helpful feedback from the community I'm very close (I think.) (I'm using a metaclass solution instead of the class decorator solution in the previous question/answer because you can't set attributes on classmethods, which I need.) I am having a strange error I don't understand. At the end of my post are the contents of a models.py that you can pop into a fresh project/application to see the error. Set your database to sqlite and add the application to installed apps. This is the error: Validating models... Unhandled exception in thread started by Traceback (most recent call last): File "/Library/Python/2.6/site-packages//lib/python2.6/site-packages/django/core/management/commands/runserver.py", line 48, in inner_run File "/Library/Python/2.6/site-packages/django/core/management/base.py", line 253, in validate raise CommandError("One or more models did not validate:\n%s" % error_text) django.core.management.base.CommandError: One or more models did not validate: local.myothermodel: 'my_model' has a relation with model MyModel, which has either not been installed or is abstract. I've indicated a few different things you can comment in/out to fix the error. First, if you don't modify the attrs sent to the metaclass's __new__, then the error does not arise. (Note even if you copy the dictionary element by element into a new dictionary, it still fails; only using the exact attrs dictionary works.) Second, if you reference the first model by class rather than by string, the error also doesn't arise regardless of what you do in __new__. I appreciate your help. I'll be githubbing the solution if and when it works. Maybe other people would enjoy a simplified way to use Django signals to observe application happenings. #models.py from django.db import models from django.db.models.base import ModelBase from django.db.models import signals import pdb class UnconnectedMethodWrapper(object): sender = None method = None signal = None def __init__(self, signal, sender, method): self.signal = signal self.sender = sender self.method = method def post_save(sender): return _make_decorator(signals.post_save, sender) def _make_decorator(signal, sender): def decorator(view): return UnconnectedMethodWrapper(signal, sender, view) return decorator class ConnectableModel(ModelBase): """ A meta class for any class that will have static or class methods that need to be connected to signals. """ def __new__(cls, name, bases, attrs): unconnecteds = {} ## NO WORK newattrs = {} for name, attr in attrs.iteritems(): if isinstance(attr, UnconnectedMethodWrapper): unconnecteds[name] = attr newattrs[name] = attr.method #replace the UnconnectedMethodWrapper with the method it wrapped. else: newattrs[name] = attr ## NO WORK # newattrs = {} # for name, attr in attrs.iteritems(): # newattrs[name] = attr ## WORKS # newattrs = attrs new = super(ConnectableModel, cls).__new__(cls, name, bases, newattrs) for name, unconnected in unconnecteds.iteritems(): _connect_signal(unconnected.signal, unconnected.sender, getattr(new, name), new._meta.app_label) return new def _connect_signal(signal, sender, receiver, default_app_label): # full implementation also accepts basestring as sender and will look up model accordingly signal.connect(sender=sender, receiver=receiver) class MyModel(models.Model): __metaclass__ = ConnectableModel @post_save('In my application this string matters') @classmethod def observe_it(klass, sender, instance, created, **kwargs): pass @classmethod def normal_class_method(klass): pass class MyOtherModel(models.Model): ## WORKS # my_model = models.ForeignKey(MyModel) ## NO WORK my_model = models.ForeignKey('MyModel')

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• Possible bug in ASP.NET MVC with form values being replaced.

  - by Dan Atkinson

  I appear to be having a problem with ASP.NET MVC in that, if I have more than one form on a page which uses the same name in each one, but as different types (radio/hidden/etc), then, when the first form posts (I choose the 'Date' radio button for instance), if the form is re-rendered (say as part of the results page), I seem to have the issue that the hidden value of the SearchType on the other forms is changed to the last radio button value (in this case, SearchType.Name). Below is an example form for reduction purposes. <% Html.BeginForm("Search", "Search", FormMethod.Post); %> <%= Html.RadioButton("SearchType", SearchType.Date, true) %> <%= Html.RadioButton("SearchType", SearchType.Name) %> <input type="submit" name="submitForm" value="Submit" /> <% Html.EndForm(); %> <% Html.BeginForm("Search", "Search", FormMethod.Post); %> <%= Html.Hidden("SearchType", SearchType.Colour) %> <input type="submit" name="submitForm" value="Submit" /> <% Html.EndForm(); %> <% Html.BeginForm("Search", "Search", FormMethod.Post); %> <%= Html.Hidden("SearchType", SearchType.Reference) %> <input type="submit" name="submitForm" value="Submit" /> <% Html.EndForm(); %> Resulting page source (this would be part of the results page) <form action="/Search/Search" method="post"> <input type="radio" name="SearchType" value="Date" /> <input type="radio" name="SearchType" value="Name" /> <input type="submit" name="submitForm" value="Submit" /> </form> <form action="/Search/Search" method="post"> <input type="hidden" name="SearchType" value="Name" /> <!-- Should be Colour --> <input type="submit" name="submitForm" value="Submit" /> </form> <form action="/Search/Search" method="post"> <input type="hidden" name="SearchType" value="Name" /> <!-- Should be Reference --> <input type="submit" name="submitForm" value="Submit" /> </form> Please can anyone else with RC1 confirm this? Maybe it's because I'm using an enum. I don't know. I should add that I can circumvent this issue by using 'manual' input () tags for the hidden fields, but if I use MVC tags (<%= Html.Hidden(...) %), .NET MVC replaces them every time. Many thanks. Update: I've seen this bug again today. It seems that this crops its head when you return a posted page and use MVC set hidden form tags with the Html helper. I've contacted Phil Haack about this, because I don't know where else to turn, and I don't believe that this should be expected behaviour as specified by David.

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• Google App Engine - Secure Cookies

  - by tponthieux

  I'd been searching for a way to do cookie based authentication/sessions in Google App Engine because I don't like the idea of memcache based sessions, and I also don't like the idea of forcing users to create google accounts just to use a website. I stumbled across someone's posting that mentioned some signed cookie functions from the Tornado framework and it looks like what I need. What I have in mind is storing a user's id in a tamper proof cookie, and maybe using a decorator for the request handlers to test the authentication status of the user, and as a side benefit the user id will be available to the request handler for datastore work and such. The concept would be similar to forms authentication in ASP.NET. This code comes from the web.py module of the Tornado framework. According to the docstrings, it "Signs and timestamps a cookie so it cannot be forged" and "Returns the given signed cookie if it validates, or None." I've tried to use it in an App Engine Project, but I don't understand the nuances of trying to get these methods to work in the context of the request handler. Can someone show me the right way to do this without losing the functionality that the FriendFeed developers put into it? The set_secure_cookie, and get_secure_cookie portions are the most important, but it would be nice to be able to use the other methods as well. #!/usr/bin/env python import Cookie import base64 import time import hashlib import hmac import datetime import re import calendar import email.utils import logging def _utf8(s): if isinstance(s, unicode): return s.encode("utf-8") assert isinstance(s, str) return s def _unicode(s): if isinstance(s, str): try: return s.decode("utf-8") except UnicodeDecodeError: raise HTTPError(400, "Non-utf8 argument") assert isinstance(s, unicode) return s def _time_independent_equals(a, b): if len(a) != len(b): return False result = 0 for x, y in zip(a, b): result |= ord(x) ^ ord(y) return result == 0 def cookies(self): """A dictionary of Cookie.Morsel objects.""" if not hasattr(self,"_cookies"): self._cookies = Cookie.BaseCookie() if "Cookie" in self.request.headers: try: self._cookies.load(self.request.headers["Cookie"]) except: self.clear_all_cookies() return self._cookies def _cookie_signature(self,*parts): self.require_setting("cookie_secret","secure cookies") hash = hmac.new(self.application.settings["cookie_secret"], digestmod=hashlib.sha1) for part in parts:hash.update(part) return hash.hexdigest() def get_cookie(self,name,default=None): """Gets the value of the cookie with the given name,else default.""" if name in self.cookies: return self.cookies[name].value return default def set_cookie(self,name,value,domain=None,expires=None,path="/", expires_days=None): """Sets the given cookie name/value with the given options.""" name = _utf8(name) value = _utf8(value) if re.search(r"[\x00-\x20]",name + value): # Don't let us accidentally inject bad stuff raise ValueError("Invalid cookie %r:%r" % (name,value)) if not hasattr(self,"_new_cookies"): self._new_cookies = [] new_cookie = Cookie.BaseCookie() self._new_cookies.append(new_cookie) new_cookie[name] = value if domain: new_cookie[name]["domain"] = domain if expires_days is not None and not expires: expires = datetime.datetime.utcnow() + datetime.timedelta( days=expires_days) if expires: timestamp = calendar.timegm(expires.utctimetuple()) new_cookie[name]["expires"] = email.utils.formatdate( timestamp,localtime=False,usegmt=True) if path: new_cookie[name]["path"] = path def clear_cookie(self,name,path="/",domain=None): """Deletes the cookie with the given name.""" expires = datetime.datetime.utcnow() - datetime.timedelta(days=365) self.set_cookie(name,value="",path=path,expires=expires, domain=domain) def clear_all_cookies(self): """Deletes all the cookies the user sent with this request.""" for name in self.cookies.iterkeys(): self.clear_cookie(name) def set_secure_cookie(self,name,value,expires_days=30,**kwargs): """Signs and timestamps a cookie so it cannot be forged""" timestamp = str(int(time.time())) value = base64.b64encode(value) signature = self._cookie_signature(name,value,timestamp) value = "|".join([value,timestamp,signature]) self.set_cookie(name,value,expires_days=expires_days,**kwargs) def get_secure_cookie(self,name,include_name=True,value=None): """Returns the given signed cookie if it validates,or None""" if value is None:value = self.get_cookie(name) if not value:return None parts = value.split("|") if len(parts) != 3:return None if include_name: signature = self._cookie_signature(name,parts[0],parts[1]) else: signature = self._cookie_signature(parts[0],parts[1]) if not _time_independent_equals(parts[2],signature): logging.warning("Invalid cookie signature %r",value) return None timestamp = int(parts[1]) if timestamp < time.time() - 31 * 86400: logging.warning("Expired cookie %r",value) return None try: return base64.b64decode(parts[0]) except: return None uid=1234|1234567890|d32b9e9c67274fa062e2599fd659cc14 Parts: 1. uid is the name of the key 2. 1234 is your value in clear 3. 1234567890 is the timestamp 4. d32b9e9c67274fa062e2599fd659cc14 is the signature made from the value and the timestamp

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• Neo4j OutOfMemory problem

  - by Edward83

  Hi! This is my source code of Main.java. It was grabbed from neo4j-apoc-1.0 examples. The goal of modification to store 1M records of 2 nodes and 1 relation: package javaapplication2; import org.neo4j.graphdb.GraphDatabaseService; import org.neo4j.graphdb.Node; import org.neo4j.graphdb.RelationshipType; import org.neo4j.graphdb.Transaction; import org.neo4j.kernel.EmbeddedGraphDatabase; public class Main { private static final String DB_PATH = "neo4j-store-1M"; private static final String NAME_KEY = "name"; private static enum ExampleRelationshipTypes implements RelationshipType { EXAMPLE } public static void main(String[] args) { GraphDatabaseService graphDb = null; try { System.out.println( "Init database..." ); graphDb = new EmbeddedGraphDatabase( DB_PATH ); registerShutdownHook( graphDb ); System.out.println( "Start of creating database..." ); int valIndex = 0; for(int i=0; i<1000; ++i) { for(int j=0; j<1000; ++j) { Transaction tx = graphDb.beginTx(); try { Node firstNode = graphDb.createNode(); firstNode.setProperty( NAME_KEY, "Hello" + valIndex ); Node secondNode = graphDb.createNode(); secondNode.setProperty( NAME_KEY, "World" + valIndex ); firstNode.createRelationshipTo( secondNode, ExampleRelationshipTypes.EXAMPLE ); tx.success(); ++valIndex; } finally { tx.finish(); } } } System.out.println("Ok, client processing finished!"); } finally { System.out.println( "Shutting down database ..." ); graphDb.shutdown(); } } private static void registerShutdownHook( final GraphDatabaseService graphDb ) { // Registers a shutdown hook for the Neo4j instance so that it // shuts down nicely when the VM exits (even if you "Ctrl-C" the // running example before it's completed) Runtime.getRuntime().addShutdownHook( new Thread() { @Override public void run() { graphDb.shutdown(); } } ); } } After a few iterations (around 150K) I got error message: "java.lang.OutOfMemoryError: Java heap space at java.nio.HeapByteBuffer.(HeapByteBuffer.java:39) at java.nio.ByteBuffer.allocate(ByteBuffer.java:312) at org.neo4j.kernel.impl.nioneo.store.PlainPersistenceWindow.(PlainPersistenceWindow.java:30) at org.neo4j.kernel.impl.nioneo.store.PersistenceWindowPool.allocateNewWindow(PersistenceWindowPool.java:534) at org.neo4j.kernel.impl.nioneo.store.PersistenceWindowPool.refreshBricks(PersistenceWindowPool.java:430) at org.neo4j.kernel.impl.nioneo.store.PersistenceWindowPool.acquire(PersistenceWindowPool.java:122) at org.neo4j.kernel.impl.nioneo.store.CommonAbstractStore.acquireWindow(CommonAbstractStore.java:459) at org.neo4j.kernel.impl.nioneo.store.AbstractDynamicStore.updateRecord(AbstractDynamicStore.java:240) at org.neo4j.kernel.impl.nioneo.store.PropertyStore.updateRecord(PropertyStore.java:209) at org.neo4j.kernel.impl.nioneo.xa.Command$PropertyCommand.execute(Command.java:513) at org.neo4j.kernel.impl.nioneo.xa.NeoTransaction.doCommit(NeoTransaction.java:443) at org.neo4j.kernel.impl.transaction.xaframework.XaTransaction.commit(XaTransaction.java:316) at org.neo4j.kernel.impl.transaction.xaframework.XaResourceManager.commit(XaResourceManager.java:399) at org.neo4j.kernel.impl.transaction.xaframework.XaResourceHelpImpl.commit(XaResourceHelpImpl.java:64) at org.neo4j.kernel.impl.transaction.TransactionImpl.doCommit(TransactionImpl.java:514) at org.neo4j.kernel.impl.transaction.TxManager.commit(TxManager.java:571) at org.neo4j.kernel.impl.transaction.TxManager.commit(TxManager.java:543) at org.neo4j.kernel.impl.transaction.TransactionImpl.commit(TransactionImpl.java:102) at org.neo4j.kernel.EmbeddedGraphDbImpl$TransactionImpl.finish(EmbeddedGraphDbImpl.java:329) at javaapplication2.Main.main(Main.java:62) 28.05.2010 9:52:14 org.neo4j.kernel.impl.nioneo.store.PersistenceWindowPool logWarn WARNING: [neo4j-store-1M\neostore.propertystore.db.strings] Unable to allocate direct buffer" Guys! Help me plzzz, what I did wrong, how can I repair it? Tested on platform Windows XP 32bit SP3. Maybe solution within creation custom configuration? thnx 4 every advice!

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