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  • Overriding an abstract method of base class

    - by jess
    Hi, I have an abstract class with some methods,including an abstract method(Execute()).This method is overridden in child class.Now, an event is raised(somewhere in application),and for this event there is a handler in base class.And,in this handler,I call Execute. Now, the method of chilobject is executed.I am bit confused,how this works under the hood?

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  • Java: Efficiency of the readLine method of the BufferedReader and possible alternatives

    - by Luhar
    We are working to reduce the latency and increase the performance of a process written in Java that consumes data (xml strings) from a socket via the readLine() method of the BufferedReader class. The data is delimited by the end of line separater (\n), and each line can be of a variable length (6KBits - 32KBits). Our code looks like: Socket sock = connection; InputStream in = sock.getInputStream(); BufferedReader inputReader = new BufferedReader(new InputStreamReader(in)); ... do { String input = inputReader.readLine(); // Executor call to parse the input thread in a seperate thread }while(true) So I have a couple of questions: Will the inputReader.readLine() method return as soon as it hits the \n character or will it wait till the buffer is full? Is there a faster of picking up data from the socket than using a BufferedReader? What happens when the size of the input string is smaller than the size of the Socket's receive buffer? What happens when the size of the input string is bigger than the size of the Socket's receive buffer? I am getting to grips (slowly) with Java's IO libraries, so any pointers are much appreciated. Thank you!

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  • Strange profiling results: definitely non-bottleneck method pops up

    - by jkff
    I'm profiling a program using sampling profiling in YourKit and JProfiler, and also "manually" (I launch it and press Ctrl-Break several times to get thread dumps). All three methods give me extremely strange results: some tens of percents of time spent in a 3-line method that does not even do any allocation or synchronization and doesn't have loops etc. Moreover, after I made this method into a NOP and even removed its invocation completely, the observable program performance didn't change at all (although it got a negligible memory leak, since it was a method for freeing a cheap resource). I'm thinking that this might be because of the constraints that JVM puts on the moments at which a thread's stacktrace may be taken, and it somehow turns out that in my program it is exactly the moments where this method is invoked, although there is absolutely nothing special about it or the context in which it is invoked. What can be the explanation for this phenomenon? What are the aforementioned constraints? What further measurements can I take to clarify the situation?

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  • MVC 2 - Name Attributes on HTML Input Field when using Parent/Child Entities

    - by Click Ahead
    Hi All, I'm pretty new to MVC 2 using the Entity Framework. I have two tables Company {ID int identity PK,Name nvarchar} and User {ID int identity PK,UserName nvarchar,CompanyID int FK}. A Foreign Key exists between User and Company. I generated my ADO.NET Entity Data Model, a Controller and a view to insert a record. My HTML form has the fields Company and UserName and the idea is when I click save a Company and User is inserted into the database. Sounds straight forward right! My question is as follows: I created a strongly-typed view derived from my 'User' entity. I'm using the the html helper Html.TextBoxFor(model = model.Organisation.Name) but the html name attribute for this input field is 'Organisation.Name'. My problem with this is that the dot throws up all sorts of issues in JQuery, which sees this as a property. If I want to change the name I read that I can use DataAnnotations but because I used the Entity Designer this involves using Buddy Classes. Seems like a bit of overkill just to change the html name attribute on this input field. Am I approaching this the right way or am I missing something here? Thanks for the help !

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  • Using C++, how to call a base class method from a derived class method and apply this to an object passed as an argument?

    - by Chris
    I can't figure out how to call a base class method from a derived class method but concurrently applying this method call at an object passed as argument. What I mean is this: class Animal { virtual void eat(Animal& to_be_eaten) = 0; }; class Carnivores: public Animal { virtual void eat(Animal& to_be_eaten) { /*implementation here*/} }; class Wolf : public Carnivores { virtual void eat(Animal& to_be_eaten) { /*call eat method(of Base class) of Base to_be_eaten here*/ } } I thought of something like this dynamic_cast<Carnivores&>(to_be_eaten).eat(*this) //and got a segmentation fault Is there any way for this to be done? Thank you! New edit:: Updated the code

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  • XBAP Browser Control - Invoking Click event of the html Input type button

    - by maharaj
    Hi, Here is what I have. 1.XBAP application with WPF Browser control, hosted on Page1.xaml 2.XBAP in Full Trust, certificate installed in client browser 3.Once the XBAP loaded, the browser control is navigated to some third party site. 4.We are using MVVM for XAML stuff So, when a certain page is loaded, I attach click event handler to the input button with id="submit" on the html page displayed in the browser control (used the code similar to whats in this URL http://social.msdn.microsoft.com/Forums/en-US/wpf/thread/a4f0e4d0-78bf-44c5-a3fe-8faf2e7a0568/). It works just fine as long as I dont make a wcf web service call in my ViewModel, before or after I attach this event hander. Idea is to invoke the click event for the html button and grab the data from the html page before calling the webservice to save data from the page. Here is the issue: When I make the wcf webservice call (sync or async, it doesnt matter) the click event doesnt happen but if I comment out the the code for wcf service call the click event of the html input of type button gets invoked. Any help would be appreciated. Thanks, Salil

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  • Ruby: Calling class method from instance

    - by Peter
    In Ruby, how do you call a class method from one of that class's instances? Say I have class Truck def self.default_make # Class method. "mac" end def initialize # Instance method. Truck.default_make # gets the default via the class's method. # But: I wish to avoid mentioning Truck. Seems I'm repeating myself. end end the line Truck.default_make retrieves the default. But is there a way of saying this without mentioning Truck? It seems like there should be.

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  • How to get a reference to a method's caller object from within the method in Objective-C

    - by shakeelw
    Hi guys. I have a few text fields and text views on my application's view. The keyboard comes up when I click in anyone of them. I have a method that gets called when any one of these objects is tapped in. However, I would like the method to execute its code only if the a certain Text Field(s) or a certain Text View(s) is tapped in. I would therefore like to have something like this in the method body: { if(currentField != mySpecialField) {return;} //Rest of the method code... } Now, my question is, how do I get a reference to the currently tapped in field so that I can perform the if-check. Thanks guys. I'm a total noobee in Objective-C. :(

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  • Why would a "view" object in Interface Builder prevent my didFinishLaunchingWithOptions method from

    - by BeachRunnerJoe
    You may have already come across some of my other questions related to question, but I was having an issue with a SplitView iPad app where my application:didFinishLaunchingWithOptions method stopped executing after I went into Interface Builder and changed around the structure of my apps interface. I couldn't figure out what was preventing my didFinishLauchingWithOptions method from executing, but then I removed a "view" object I had in my view heirarchy (shown below) and suddenly my didFinishLauchingWithOptions method started executing again. I've moved passed it now, but I'm still unclear why that would cause the problem. Any ideas why that "view" object would prevent the didFinishLaunchingWithOptions method from executing?

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  • BeginInvoke not invoking the target method in Release build

    - by Elan
    I have a method, which I wish to execute on the UI message pump and thus do the following: private void SomeMethod() { BeginInvoke(new MethodInvoker(MethodToInvoke)); } private void MethodToInvoke() { // This method contains code that I wish to execute on UI message pump. } Now, the above works just fine when I create a Debug build of the project. However, when I create a Release build, the "MethodToInvoke" method does not get invoked. Does anyone have any idea why this might be? Thanks, Elan

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  • Control Reference Static Method Performance

    - by dotnetguts
    I have just asked which one is better? Static Vs Non-Static? http://stackoverflow.com/questions/3016717/static-vs-non-static-method-performance-c I would like to take this discussion one step ahead. Consider If i pass reference of Panel control as parameter to Public static method, will static method still rules in performance?

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  • Capitalize Words in PHP with custom delimitor

    - by Paulie
    Hey guys, i need a method to capitalize every first letter of a word. This is what i got so far and it is working for almost every string...but it fails on this one "WELLNESS & RENOMME". // method in stringModify Class function capitalizeWords($words, $charList) { $capitalizeNext = true; for ($i = 0, $max = strlen($words); $i < $max; $i++) { if (strpos($charList, $words[$i]) !== false) { $`capitalizeNext` = true; } else if ($capitalizeNext) { $capitalizeNext = false; $words[$i] = strtoupper($words[$i]); } } return $words; } // Calling method $stringModify->capitalizeWords("WELLNESS & RENOMME", " -&"); I hope someone can help me out...i tried for 1,5 hours now and don't have a clue. Thanks in advance for any tips or hints. Greetz Paulie

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  • Cannot call action method 'System.Web.Mvc.PartialViewResult Foo[T](T)' on controller 'Controller' be

    - by MedicineMan
    Cannot call action method 'System.Web.Mvc.PartialViewResult FooT' on controller 'Controller' because the action method is a generic method <% Html.RenderAction("Foo", model = Model}); %> Is there a workaround for this limitation on ASP MVC 2? I would really prefer to use a generic. The workaround that I have come up with is to change the model type to be an object. It works, but is not preferred: public PartialViewResult Foo<T>(T model) where T : class { // do stuff }

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  • Ajax method call

    - by LooDaFunk
    Hi, I am trying to call a simple method in my code behind using Jquery with Ajax. But I get a 404 not found exception everytime. Unfortunately this is a web forms solution. So I dont have all the perks of MVC :( It does get into the javascript method and gives the alert but won't go into my c# method. My previous experience of using this Jquery method is in an MVC website. Is it compatible with webforms sites? Here is the code: http://pastebin.com/Xdey4XTS Thanks Merry Christmas!

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  • how do i change the value of an input field with jquery?

    - by Lina
    Hi, i'm trying to use jquery to change the value of an input text box, but it's not working, here is my code... <form method="get"> <input id="temp" type="text" name="here" value="temp value" /> <input class="form" type="radio" value="1" name="someForm" /> Enter something Here: <input id="input" type="text" name="here" value="test value" /> </form> <script> var cachedAjax = new Object(); $(document).ready(function () { $('.form').click(function () { var newvalue = $("#input").val(); $("#temp").val(newvalue); $("input").val($(temp).val()); }); }); </script> the value of the "#input" text box is not changing!!!!!! why is that??? what am i missing??? thanks a 10 million in advance

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  • How to invoke a method with a generic return type using reflection

    - by Andre Luus
    Hi there! I'm trying to invoke a method with reflection that has a generic return type, like this: public class SomeClass<T> { public List<T> GetStuff(); } I get an instance of SomeClass with a call to a Repository's GetClass<T> generic method. MethodInfo lGetSomeClassMethodInfo = typeof(IRepository) .GetMethod("GetClass") .MakeGenericMethod(typeof(SomeClass<>); object lSomeClassInstance = lGetSomeClassMethodInfo.Invoke( lRepositoryInstance, null); After that, I this is where I try to invoke the GetStuff method: typeof(SomeClass<>).GetMethod("GetStuff").Invoke(lSomeClassInstance, null) I get an exception about the fact that the method has generic arguments. However, I can't use MakeGenericMethod to resolve the return type. Also, if instead of typeof(SomeClass<>) I use lSomeClassInstance.GetType() (which should have resolved types) GetMethod("GetStuff") returns null! UPDATE I have found the solution and will post the answer shortly.

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