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//----------------------------------------------------------------
// Copyright (c) Microsoft Corporation. All rights reserved.
//----------------------------------------------------------------
namespace System.ServiceModel.Activities
{
using System.Runtime;
using System.ServiceModel.Activities.Dispatcher;
using System.Threading;
[Fx.Tag.XamlVisible(false)]
public sealed class WorkflowHostingResponseContext
{
AsyncWaitHandle responseWaitHandle;
WorkflowOperationContext context;
object returnValue;
object[] outputs;
// Used by Creation Endpoint
internal WorkflowHostingResponseContext()
{
this.responseWaitHandle = new AsyncWaitHandle(EventResetMode.AutoReset);
}
// Used by BookmarkResumption Endpoint
internal WorkflowHostingResponseContext(WorkflowOperationContext context)
{
this.context = context;
}
public void SendResponse(object returnValue, object[] outputs)
{
this.returnValue = returnValue;
this.outputs = outputs ?? EmptyArray.Allocate(0);
if (this.responseWaitHandle != null)
{
this.responseWaitHandle.Set();
}
else
{
Fx.Assert(this.context != null, "context must not be null!");
if (this.returnValue is Exception)
{
this.context.SendFault((Exception)this.returnValue);
}
else
{
this.context.SendReply(this.returnValue, this.outputs);
}
}
}
object GetResponse(out object[] outputs)
{
if (this.returnValue is Exception)
{
throw FxTrace.Exception.AsError((Exception)this.returnValue);
}
outputs = this.outputs;
return this.returnValue;
}
internal IAsyncResult BeginGetResponse(TimeSpan timeout, AsyncCallback callback, object state)
{
Fx.Assert(this.responseWaitHandle != null, "this.responseWaitHandle must not be null!");
return GetResponseAsyncResult.Create(this, timeout, callback, state);
}
internal object EndGetResponse(IAsyncResult result, out object[] outputs)
{
return GetResponseAsyncResult.End(result, out outputs);
}
class GetResponseAsyncResult : AsyncResult
{
static Action<object, TimeoutException> handleEndWait = new Action<object, TimeoutException>(HandleEndWait);
WorkflowHostingResponseContext context;
GetResponseAsyncResult(WorkflowHostingResponseContext context, TimeSpan timeout, AsyncCallback callback, object state)
: base(callback, state)
{
this.context = context;
if (context.responseWaitHandle.WaitAsync(handleEndWait, this, timeout))
{
Complete(true);
}
}
public static GetResponseAsyncResult Create(WorkflowHostingResponseContext context, TimeSpan timeout, AsyncCallback callback, object state)
{
return new GetResponseAsyncResult(context, timeout, callback, state);
}
public static object End(IAsyncResult result, out object[] outputs)
{
GetResponseAsyncResult thisPtr = AsyncResult.End<GetResponseAsyncResult>(result);
return thisPtr.context.GetResponse(out outputs);
}
static void HandleEndWait(object state, TimeoutException e)
{
GetResponseAsyncResult thisPtr = (GetResponseAsyncResult)state;
thisPtr.Complete(false, e);
}
}
}
}
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