Renewing a WCF client when SCT has expired?

Question

I am using WCF to a soap endpoint using security mode \"TransportWithMessageCredential\".

The WCF client/server uses SCT (Security Context Token) to maintain a secur

Answer 1

You might be able to use the decorater pattern to handle exceptions with WCF proxies. If this path is open to you, you can consider something like this set-up which will handle the proxy faulting and re-initialise it for callers. Subsequent exceptions will be thrown up to the caller.

//Proxy implements this
interface IMyService
{

  void MyMethod();

}

//Decorator 1
public class MyServiceProxyRetryingDecorator : IMyService
{

  //This is the real proxy that might be faulted
  private realProxy = new RealProxy();

  public void MyMethod()
  {
    ReEstablishProxyIfNecessary();
    //now just pass the call to the proxy, if it errors again, 
    //do more handling or let the exception bubble up
    realProxy.MyMethod();
  }

  private void ReEstablishProxyIfNecessary()
  {
    if(realProxy.CommunicationState == CommunicationState.Faulted)
    {
       realProxy.Abort();
       realProxy = new RealProxy();
    }
  }
}

An different version of the decorator could have the decorator handling your MessageSecurityException, and re-initialising the real proxy when it is caught:

//Decorator 2
public class MyServiceProxyExceptionHandlingDecorator : IMyService
{

  //This is the real proxy that might be faulted
  private realProxy = new RealProxy();

  public void MyMethod()
  {
    try {realProxy.MyMethod(); } 
    catch (ExceptionYouAreInterestedIn ex)
    { 
    ReEstablishProxyIfNecessary(); 
    realProxy.MyMethod(); //do it again
    }
  }

  private void ReEstablishProxyIfNecessary()
  {
    if(realProxy.CommunicationState == CommunicationState.Faulted)
    {
       realProxy.Abort();
       realProxy = new RealProxy();
    }
  }
}