WCF/S#arpArch: underlying ISession is closed after the first call within a request

Question

I know the use of WCF in SA is deprecated because it will move to SA Contrib. But until it has, I guess I have to use the support in SA.

That said, I have a problem

Answer 1

I managed to solve it.

By inspecting the SharpArch.Wcf source code, I found that before the WCF service response is sent, it always closes all NHibernate sessions. This in its self is a good thing.

In addition, I found that my client proxy factories only fired once per web request, while the second service call should induce a new proxy instance. The result was that the second service call would fail because the underlying NHibernate session was closed already. I solved that by decorating my client proxy classes with the Castle.Core.TransientAttribute, which leaves the lifetime management up to the factory that creates the client. The result of that is that our proxy factories get called every time a proxy is requested.

Second, I had to register the proxies like this (in the ComponentRegistrar class):

container.AddFacility("WcfSessionFacility", new WcfSessionFacility());

container.Kernel.AddComponentWithExtendedProperties(
    "AccountService",
    typeof(IAccountService),
    typeof(AccountServiceClient),
    new Dictionary()
        {
            { WcfSessionFacility.ManageWcfSessionsKey, true }
        });

The WcfSessionFacility manages closing/aborting of the client, depending on its state. This makes sure the client channel is closed whenever the client proxy is destroyed so we don't need to put our calls in try-catch blocks.

Like me, you might think to configure lifetime management while adding the component instead of using an attribute but apparently there is no suitable overload of AddComponentWithExtendedProperties that allows this.