Vb.net - Singleton IN Per Session Or Per Machine?
Sep 8, 2010
I have an web application written in ASP.NET (FW 3.5) (along with some VBScript, this is a legacy app) that uses a utility class in the backend that logs error. I need to log several values that a user has entered in the front-end. Since the utility class has no access to the front end (or any HTTP services), i created a singleton class within the utility namespace that my front end UI can access and store information about the user.
I guess more specifically, I am wondering if there's a way to store session variables that can be shared across the web application and web services through a class referenced by both of the application and web services. For example, I have an error handling class that is used by both instances that required information about the user. Is there a way to create a per-session singleton to hold that information, so that my error class will have access to the user info? or is this not possible - that i'll need to pass the information around as they are needed?
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public sealed class Singleton
{
static ServerInstance instance = null;
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Singleton() {
}
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get {
lock (padlock) {
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}
}
}
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ExceptionFactory.Fatal("~Singleton() called!");
#endif
}
}
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InitServer();
}
return Singleton.Instance.OnReceiveEvent(objectXmlData, objectType);
}
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Jun 28, 2010
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Nov 17, 2010
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[Code]....
In Above class structure I have created two method one is Static and second is non static, When I am trying to access Static Method it gives me compile time error.
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Apr 19, 2010
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[Code]....
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[Code]....
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Mar 30, 2010
See in below I have writtine a
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[Code]....
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Jul 22, 2010
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Jun 25, 2010
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Jan 25, 2010
want to make sure I am not assuming something foolish here, when implementing the singleton pattern in an ASP .Net web application the static variable scope is only for the current user session, right? If a second user is accessing the site it is a different memory scope...?
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Jan 7, 2011
I need to create a singleton that would hold lots of data for a spedesign patterns - Singleton behavior with multi-user requests in ASP.NETcific user. However, I am not unclear as to what the behavior of that singleton is in regard to multi-user app requests.
Here is the scenario:
On AppStart event I want to load common data for all users (from SQL) and store it as a collection somewhere within the ASP.NET storage mechanisms.
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On PostAuthenticate event I want to get user specific data from SQL in the form of a collection. If i store it as a singleton (in a similar manner as the common data) i am not clear as to:
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What happens between post-backs to that singleton? If another user logs in would another instance of that singleton be created for that specific application instance?
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Jun 2, 2010
If I run below ASP.NET code, it gives me same output in different post-backs. First Time
Name is = Smith
also After Post-back (Button Click)
Name is = Smith
I feel though I have defined singleton, it should return a new object every time in different ASP.NET post-backs. because once the function "PAGE_LOAD" is completed then there are no reference variables holding singleton object. So there is a change of unloading the singleton class from memory by CLR. that means there is a chance of losing private static reference variable and also single ton object stored. In ASP.NET stateless environment, why is it keeping earlier object in multiple post backs and btw, without having any reference variable to that object. Is this is known danger with singleton in ASP.NET environment?
[Code]....
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