CODEWITHSUNDEEP
asp.net.netglobal-variables
Costa
Costa

Reputation: 4085

How to pass global variable to a referenced assembly?

How to pass global variable to a referenced assembly?

I am modifying an asp.net app. It is required to log all Employee (the current user of the website) actions like saving a new customer or update invoice data. The UI layer is calling a referenced assembly BLL.dll.

I want to pass current Emplyee to the referenced assembly. The passed Employee should be shared accross all static methods in that dll. It should be thread safe because the Employee can be changed accross requests.

I can't expose static field in the BLL because the Employee is stored in session state.

I need something not static, Global, accessible by both assemblies (UI layer and BLL.dll), and thread safe.

I am thinking about using some variable stored in current thread object. but I don't know what exactly I should do??

Any workarrounds ??

Thanks

Upvotes: 0

Views: 676

Answers (1)

Daniel A. White
Daniel A. White

Reputation: 190945

Basically you need something in your BLL that can get the reference. You can use a strategy pattern with an interface.

// IN BLL.dll

public interface IEmployeeContextImplementation 
{
   Employee Current { get; }
}

public static EmployeeContext 
{
   private static readonly object ImplementationLock = new object();
   private static IEmployeeContextImplementation Implementation;

   public static void SetImplementation(IEmployeeContextImplementation impl)
   {
      lock(ImplementationLock)
      {
         Implementation = impl;
      }
   }
   public static Employee Current { get { return Implementation.Current; }
}

Then in your web app, implement IEmployeeContextImplementation with the session state and call SetImplementation only once in application start.

However, Session state is only good enough for within the context of a request. If you need it to go on a different thread, you will have to explicitly pass it to a different thread.

Upvotes: 2

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