Greetings, I would like to ask if creating Singleton to have only one active connection to db is a good idea. What i would like to do is: 1) I have a wcf service 2) wcf service gets data from db 3) i would like to create a singleton like this to have only one connection to db: private static PersistanceSingleton _Instance; public st...
The default way to implement singleton patter is: class MyClass { private static MyClass instance; public static MyClass getInstance() { if (instance == null) { instance = new MyClass(); } return instance; } } In an old project, I've tried to simplify the things writing: class MyClass { private static final ...
From what I understand, a singleton is basically when you have a private member that represents the object you want to have a single instance for. Then in the constructor you initialize the member object. All references for this object are done via a public property, and the public property just references the private member that has a...
I'm using a singleton pattern for the datacontext in my web application so that I dont have to instantiate it every time, however I'm not sure how web applications work, does IIS open a thread for every user connected? if so, what would happend if my singleton is not thread safe? Also, is it OK to use a singleton pattern for the datacont...
When I started to learn about WPF and MVVM recently, I came across some sort of framework or technology in .NET that made it really easy to request a service of some kind. In my particular case, I've got an assembly that handles writing application preferences to an XML file, and I want to let all of my assemblies in the larger applicat...
I wonder how long will an ASP.NET (MVC) application run, when no new requests come in? Lets say I'm using an IOC Container ans have a Singleton Object serving to the clients. As far as I know it will serve different page requests. But how long will it live when no new request come in? Is there any timeout (maybe configured through IIS) t...
I have am working on a web application that makes use of helper classes. These classes hold functions to various operation such as form handling. Sometimes I need these classes at more than one spot in my application, The way I do it now is to make a new Object. I can't pass the variable, this will be too much work. I was wondering of ...
Ok, if I create a singleton class and expose the singleton object through a public static property...I understand that. But my singleton class has other properties in it. Should those be static? Should those also be private? I just want to be able to access all properties of my singleton class by doing this: MySingletonClass.Single...
intro Hello, I'm trying to develop some plugin or/*and* object in javascript, which will control some properties over some object. It will also use jQuery, to ease development. idea This is in pseudocode to give you an idea, since I can't really describe it in english with the right words, it's impossible to go and use google to fin...
Hi, In my senario, I have a global setting object, say GlobalSettings, it has a static property "Current" (singleton), and there should be only one GlobalSettings instance. But...In my data model, there's an entity "LocalizedContent": public class LocalizedContent { public string Title { get; set; } public string Content { g...
hi, Google results say there are more than 1 singleton template/baseclass in boost, which one do you suggest? Can anyone give me a clue? Thanks ...
I have a Selenium Test .DLL that is loaded using NUnit. I run a required Selenium Java Server quietly hidden in a process when a test is run. However I currently start the server when a test is started and Kill() it when the test stops. This results in the selenium server starting/stopping for every test. What I want is for the Sel...
I have a WCF service that I am calling from multiple clients. I need to store and manage a value globally. On my service I have the following attributes: [ServiceBehavior(InstanceContextMode = InstanceContextMode.Single, ConcurrencyMode = ConcurrencyMode.Single)] In my service I have something similar to this: private static int coun...
Suppose you have a system on the other side of a network that sends events and data that needs to be cached to some intermediate broker. Instead of giving every component of your application that needs to be informed of such events a new subscription to the broker, I decide for performance and simplicity (the third party library that ha...
I've exhausted all efforts at what appears to be a trivial problem, but gotten nowhere. There is a simple Prepare statement: $qry = $core->db->prepare("SELECT * FROM users WHERE email = '?'"); $qry->execute(array('[email protected]')); However, no rows are returned. Running the query with the parameters hardcoded into the query resul...
To keep things simplified lets say I have an interface RandomProvider interface public interface RandomProvider { double nextRandom(); } And say I have 3 different implementations of this interface, ARandom, BRandom, CRandom. I want to collect some statistics about the implementations: how many times nextRandom() is called sum ...
Hi Everyone I'm working on a WPF application which should be utilizable with two monitors. In the main window is a button which detaches a part of the content in a second window wich can then be used on the other minitor. That second window I implemented as a singleton. That works quite good except that the second window doesn't get des...
Here is my sample abstract singleton class: public abstract class A { protected static A instance; public static A getInstance() { return instance; } //...rest of my abstract methods... } And here is the concrete implementation: public class B extends A { private B() { } static { instance = new...
Hi there, guys! I am currently trying to implement a singleton service over WebLogic, using a WebLogic cluster. I've read some literature about clustered singleton services on WebLogic, and I know I have to implement weblogic.cluster.singleton.SingletonService interface on the object I want to clusterize as a singleton. import weblogic...
I was reading the article Double-checked locking and the Singleton pattern, on how double checked locking is broken, and some related questions here on stackoverflow. I have used this pattern/idiom several times without any issues. Since I have been using Java 5, my first thought was that this has been rectified in Java 5 memory model....