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  • What design pattern will you choose ?

    - by MemoryLeak
    I want to design a class, which contains a procedure to achieve a goal. And it must follow some order to make sure the last method, let's say "ExecuteIt", to behave correctly. in such a case, what design patter will you use ? which can make sure that the user must call the public method according some ordering. If you really don't know what I am saying, then can you share me some concept of choosing a design patter, or what will you consider while design a class?

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  • Ruby proc vs lambda in initialize()

    - by Jimmy Chu
    I found out this morning that proc.new works in a class initialize method, but not lambda. Concretely, I mean: class TestClass attr_reader :proc, :lambda def initialize @proc = Proc.new {puts "Hello from Proc"} @lambda = lambda {puts "Hello from lambda"} end end c = TestClass.new c.proc.call c.lambda.call In the above case, the result will be: Hello from Proc test.rb:14:in `<main>': undefined method `call' for nil:NilClass (NoMethodError) Why is that? Thanks!

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  • When calling a asmx service via jqeury, how to pass arguments?

    - by Blankman
    How can I pass my service endpoint parameters? (pagesize in this case) My .asmx service method looks like: [WebMethod] [ScriptMethod(ResponseFormat = ResponseFormat.Json)] public List<Object> GetData(int pageSize) { } When I call this via jQuery like: $.ajax({ type: "POST", url: "test.asmx/test123", data: "{}", contentType: "application/json; charset=utf-8", dataType: "json", success: function(msg) { }, error: function(msg) { } });

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  • What's the best SOAP client library for Python, and where is the documentation for it?

    - by blackrobot
    I've never used SOAP before and I'm sort of new to Python. I'm doing this to get myself acquainted with both technologies. I've installed SOAPlib and I've tried to read their Client documentation, but I don't understand it too well. Is there anything else I can look into which is more suited for being a SOAP Client library for Python? Edit: Just in case it helps, I'm using Python 2.6.

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  • Returning a shared library symbol table

    - by joemoe
    For instance: void* sdl_library = dlopen("libSDL.so", RTLD_LAZY); void* initializer = dlsym(sdl_library,"SDL_Init"); Assuming no errors, initializer will point to the function SD_Init in the shared library libSDK.so. However this requires knowing the symbol "SDL_Init" exists. Is it possibly to query a library for all its symbols? Eg, in this case it would return SDL_Init, the function pointer, and any other symbols exported by libSDL.so.

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  • Why .data() function of jQuery is better to prevent memory leaks?

    - by burak ozdogan
    Hi, Regarding to jQuery utility function jQuery.data() the online documentation says: "The jQuery.data() method allows us to attach data of any type to DOM elements in a way that is safe from circular references and therefore from memory leaks. " Why to use: document.body.foo = 52; can result a memory leak -or in what conditions- so that I should use jQuery.data(document.body, 'foo', 52); Should I ALWAYS prefer .data() instead of using expandos in any case? (I would appreciate if you can provide an example to compare the differences) Thanks, burak ozdogan

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  • How to copy DispatcherObject (BitmapSource) into different thread?

    - by Tomáš Kafka
    Hi, I am trying to figure out how can I copy DispatcherObject (in my case BitmapSource) into another thread. Use case: I have a WPF app that needs to show window in a new thread (the app is actually Outlook addin and we need to do this because Outlook has some hooks in the main UI thread and is stealing certain hotkeys that we need to use - 'lost in translation' in interop of Outlook, WPF (which we use for UI), and Winforms (we need to use certain microsoft-provided winforms controls)). With that, I have my implementation of WPFMessageBox, that is configured by setting some static properties - and and one of them is BitmapSource for icon. This is used so that in startup I can set WPFMessageBox.Icon once, and since then, every WPFMessageBox will have the same icon. The problem is that BitmapSource, which is assigned into icon, is a DispatcherObject, and when read, it will throw InvalidOperationException: "The calling thread cannot access this object because a different thread owns it.". How can I clone that BitmapSource into the actual thread? It has Clone() and CloneCurrentValue() methods, which don't work (they throw the same exception as well). It also occured to me to use originalIcon.Dispatcher.Invoke( do the cloning here ) - but the BitmapSource's Dispatcher is null, and still - I'd create a copy on a wrong thread and still couldnt use it on mine. BitmapSource.IsFrozen == true. Any idea on how to copy the BitmapSource into different thread (without completely reconstructing it from an image file in a new thread)? EDIT: So, freezing does not help: In the end I have a BitmapFrame (Window.Icon doesn't take any other kind of ImageSource anyway), and when I assign it as a Window.Icon on a different thread, even if frozen, I get InvalidOperationException: "The calling thread cannot access this object because a different thread owns it." with a following stack trace: WindowsBase.dll!System.Windows.Threading.Dispatcher.VerifyAccess() + 0x4a bytes WindowsBase.dll!System.Windows.Threading.DispatcherObject.VerifyAccess() + 0xc bytes PresentationCore.dll!System.Windows.Media.Imaging.BitmapDecoder.Frames.get() + 0xe bytes PresentationFramework.dll!MS.Internal.AppModel.IconHelper.GetIconHandlesFromBitmapFrame(object callingObj = {WPFControls.WPFMBox.WpfMessageBoxWindow: header}, System.Windows.Media.Imaging.BitmapFrame bf = {System.Windows.Media.Imaging.BitmapFrameDecode}, ref MS.Win32.NativeMethods.IconHandle largeIconHandle = {MS.Win32.NativeMethods.IconHandle}, ref MS.Win32.NativeMethods.IconHandle smallIconHandle = {MS.Win32.NativeMethods.IconHandle}) + 0x3b bytes > PresentationFramework.dll!System.Windows.Window.UpdateIcon() + 0x118 bytes PresentationFramework.dll!System.Windows.Window.SetupInitialState(double requestedTop = NaN, double requestedLeft = NaN, double requestedWidth = 560.0, double requestedHeight = NaN) + 0x8a bytes PresentationFramework.dll!System.Windows.Window.CreateSourceWindowImpl() + 0x19b bytes PresentationFramework.dll!System.Windows.Window.SafeCreateWindow() + 0x29 bytes PresentationFramework.dll!System.Windows.Window.ShowHelper(object booleanBox) + 0x81 bytes PresentationFramework.dll!System.Windows.Window.Show() + 0x48 bytes PresentationFramework.dll!System.Windows.Window.ShowDialog() + 0x29f bytes WPFControls.dll!WPFControls.WPFMBox.WpfMessageBox.ShowDialog(System.Windows.Window owner = {WPFControlsTest.MainWindow}) Line 185 + 0x10 bytes C#

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  • Scala parser combinators: how to parse "if(x)" if x can contain a ")"

    - by Germán
    I'm trying to get this to work: def emptyCond: Parser[Cond] = ("if" ~ "(") ~> regularStr <~ ")" ^^ { case s => Cond("",Nil,Nil) } where regularStr is defined to accept a number of things, including ")". Of course, I want this to be an acceptable input: if(foo()). But for any if(x) it is taking the ")" as part of the regularStr and so this parser never succeeds. What am I missing?

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  • Opinion on "loop invariants", and are these frequently used in the industry?

    - by Michael Aaron Safyan
    I was thinking back to my freshman year at college (five years ago) when I took an exam to place-out of intro-level computer science. There was a question about loop invariants, and I was wondering if loop invariants are really necessary in this case or if the question was simply a bad example... the question was to write an iterative definition for a factorial function, and then to prove that the function was correct. The code that I provided for the factorial function was as follows: public static int factorial(int x) { if ( x < 0 ){ throw new IllegalArgumentException("Parameter must be = 0"); }else if ( x == 0 ){ return 1; }else{ int result = 1; for ( int i = 1; i <= x; i++ ){ result*=i; } return result; } } My own proof of correctness was a proof by cases, and in each I asserted that it was correct by definition (x! is undefined for negative values, 0! is 1, and x! is 1*2*3...*x for a positive value of x). The professor wanted me to prove the loop using a loop invariant; however, my argument was that it was correct "by definition", because the definition of "x!" for a positive integer x is "the product of the integers from 1... x", and the for-loop in the else clause is simply a literal translation of this definition. Is a loop invariant really needed as a proof of correctness in this case? How complicated must a loop be before a loop invariant (and proper initialization and termination conditions) become necessary for a proof of correctness? Additionally, I was wondering... how often are such formal proofs used in the industry? I have found that about half of my courses are very theoretical and proof-heavy and about half are very implementation and coding-heavy, without any formal or theoretical material. How much do these overlap in practice? If you do use proofs in the industry, when do you apply them (always, only if it's complicated, rarely, never)?

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  • determine if intersection of a set with conjunction of two other sets is empty

    - by koen
    For any three given sets A, B and C: is there a way to determine (programmatically) whether there is an element of A that is part of the conjunction of B and C? example: A: all numbers greater than 3 B: all numbers lesser than 7 C: all numbers that equal 5 In this case there is an element in set A, being the number 5, that fits. I'm implementing this as specifications, so this numerical range is just an example. A, B, C could be anything.

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  • Transfer From a Wordpress Blog to Direct domain

    - by Jaco
    One of my friends is facing an issue. He have a blog with wordpress - 'www.xyz.wordpress.com' and he want to convert it to 'www.xyz.com' by purchasing a domain name with wordpress. In this case, what would happen to his existing RSS feeds once the blog is transferred from www.xyz.wordpress.com to www.xyz.com. Will the RSS Subscribers be automatically upgraded? He have not burnt my feeds using FeedBurner.

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  • why does maven3 give up supporting application $version declaration?

    - by Bariscan
    As you see from the title, I want to ask that the case of in maven3 there is no support for $version in pom.xml anymore. Do we have to really write a constant every time in each project in every pom.xml and related configuration files again and again? How can we avoid doing this? How can we use a versioning method like $version? Many thanks in advance, Baris

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  • What's a good 2nd level cache for JEE applications?

    - by Hank
    Can anyone recommend a good 2nd level object caching solution for JEE 6 applications, and give background to your recommendation? I'm using JPA 2.0 as persistence provider. I am particularly worried about having to run the cache client as a single-thread / singleton bean. Is that the case? If so, is that an issue? I've good experience using memcached from a PHP webapp, but PHP is of course single-threaded, so that was never an issue...

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  • Checkbox gets reset in WPF Datagrid when sorting

    - by user464420
    I have a WPF application with DataGrid The DataGrid contains 4 columns with a checkbox template column on the first column the problem is when i check some of the checkbox on the items, the checkbox would got reset when i sort a certain column. For example i check the checkbox on the row 2 it gets unchecked when i sort the datagrid. been searching for similar case like this for a while but haven't seen one Thanks,

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  • best option to create simple website mockup with navigation

    - by Buzzer
    I'm trying to put together a static html website with full navigation. In other words, I want the user to click some links and images and actually be taken to another page. I'm a developer so I know how to do this in frameworks like ASP.Net MVC and grails. However, for this particular case, I just want to quickly mock up the UI and provide simple navigation so I can do some user testing. Can anyone advice on how to do this? Thanks,

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  • Prevent automatic popToRootViewController on double-tap of UITabBarController

    - by NilObject
    The default behavior of a UITabBarController is to pop the contained UINavigationController to the root view controller when a particular tab is tapped a second time. I have a particular use case where I'm wanting this to not work automatically, and I'm having a hard time figuring out how to prevent this. Has anyone run into this, and if so, what did you do? Do I need to subclass UINavigationController and override popToRootViewController or is there a simpler way?

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  • How to make per- http Request cache in ASP.NET 3.5

    - by Artem
    We using ASP.NET 3.5 (Controls-based apporach) and need to have storage specific for one http request only. Thread-specific cache with keys from session id won't work because threads are supposed to be pooled and therefore I have a chance to have data from some previous request in cache, which is undesireble in my case. I always need to have brand new storage for each request available through whole request. Any ideas how to do it in ASP.NET 3.5?

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  • Capture output from browser call using Selenium

    - by gagneet
    I need to create a use case (using Selenium) in which I send HTTP calls with a Cookie through the browser and capture the return value in a text file. What do I need to do this, I have run this using CURL in the command line, but we are encountering issues with the same, and hence wish to verify using a real UI browser.

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  • Mercurial local branching and pushing to shared repository

    - by Steve Horn
    I created a branch on my local Mercurial repository. I want to push to the shared repository so my work can be backed up, but I don't want other project members to see the branch. What's the standard operating procedure in this case? I'd like to avoid having the repository get full of developer branches that I don't need to see.

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