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//----------------------------------------------------------------
// Copyright (c) Microsoft Corporation. All rights reserved.
//----------------------------------------------------------------
namespace System.ServiceModel.Routing
{
using System;
using System.Configuration;
using System.Runtime;
using System.ServiceModel.Channels;
using System.ServiceModel.Dispatcher;
using System.ServiceModel.Security;
using System.Threading;
using System.Transactions;
//using System.Security.Principal;
class ProcessRequestAsyncResult<TContract> : TransactedAsyncResult
{
static AsyncCompletion operationCallback = new AsyncCompletion(OperationCallback);
RoutingService service;
IRoutingClient currentClient;
MessageRpc messageRpc;
Message replyMessage;
bool allCompletedSync;
bool abortedRetry;
public ProcessRequestAsyncResult(RoutingService service, Message message, AsyncCallback callback, object state)
: base(callback, state)
{
this.allCompletedSync = true;
this.service = service;
this.messageRpc = new MessageRpc(message, OperationContext.Current, service.ChannelExtension.ImpersonationRequired);
if (TD.RoutingServiceProcessingMessageIsEnabled())
{
TD.RoutingServiceProcessingMessage(this.messageRpc.EventTraceActivity, this.messageRpc.UniqueID,
message.Headers.Action, this.messageRpc.OperationContext.EndpointDispatcher.EndpointAddress.Uri.ToString(), messageRpc.Transaction != null ? "True" : "False");
}
try
{
EndpointNameMessageFilter.Set(this.messageRpc.Message.Properties, service.ChannelExtension.EndpointName);
this.messageRpc.RouteToSingleEndpoint<TContract>(this.service.RoutingConfig);
}
catch (MultipleFilterMatchesException matchesException)
{
// Wrap this exception with one that is more meaningful to users of RoutingService:
throw FxTrace.Exception.AsError(new ConfigurationErrorsException(SR.ReqReplyMulticastNotSupported(this.messageRpc.OperationContext.Channel.LocalAddress), matchesException));
}
while (this.StartProcessing())
{
}
}
bool StartProcessing()
{
bool callAgain = false;
SendOperation sendOperation = this.messageRpc.Operations[0];
this.currentClient = this.service.GetOrCreateClient<TContract>(sendOperation.CurrentEndpoint, this.messageRpc.Impersonating);
if (TD.RoutingServiceTransmittingMessageIsEnabled())
{
TD.RoutingServiceTransmittingMessage(this.messageRpc.EventTraceActivity, this.messageRpc.UniqueID, "0", this.currentClient.Key.ToString());
}
try
{
if (messageRpc.Transaction != null && sendOperation.HasAlternate)
{
throw FxTrace.Exception.AsError(new ConfigurationErrorsException(SR.ErrorHandlingNotSupportedReqReplyTxn(this.messageRpc.OperationContext.Channel.LocalAddress)));
}
// We always work on cloned message when there are backup endpoints to handle exception cases
Message message;
if (sendOperation.AlternateEndpointCount > 0)
{
message = messageRpc.CreateBuffer().CreateMessage();
}
else
{
message = messageRpc.Message;
}
sendOperation.PrepareMessage(message);
IAsyncResult result = null;
using (this.PrepareTransactionalCall(messageRpc.Transaction))
{
IDisposable impersonationContext = null;
try
{
//Perform the assignment in a finally block so it won't be interrupted asynchronously
try { }
finally
{
impersonationContext = messageRpc.PrepareCall();
}
result = this.currentClient.BeginOperation(message, messageRpc.Transaction, this.PrepareAsyncCompletion(operationCallback), this);
}
finally
{
if (impersonationContext != null)
{
impersonationContext.Dispose();
}
}
}
if (this.CheckSyncContinue(result))
{
if (this.OperationComplete(result))
{
this.Complete(this.allCompletedSync);
}
else
{
callAgain = true;
}
}
}
catch (Exception exception)
{
if (Fx.IsFatal(exception))
{
throw;
}
if (!this.HandleClientOperationFailure(exception))
{
throw;
}
callAgain = true;
}
return callAgain;
}
static bool OperationCallback(IAsyncResult result)
{
ProcessRequestAsyncResult<TContract> thisPtr = (ProcessRequestAsyncResult<TContract>)result.AsyncState;
FxTrace.Trace.SetAndTraceTransfer(thisPtr.service.ChannelExtension.ActivityID, true);
thisPtr.allCompletedSync = false;
try
{
if (thisPtr.OperationComplete(result))
{
return true;
}
}
catch (Exception exception)
{
if (Fx.IsFatal(exception))
{
throw;
}
if (!thisPtr.HandleClientOperationFailure(exception))
{
throw;
}
}
while (thisPtr.StartProcessing())
{
}
return false;
}
// Returns true if we're all done and can complete this AsyncResult now
bool OperationComplete(IAsyncResult result)
{
bool completeSelf = false;
Message responseMsg = this.currentClient.EndOperation(result);
if (TD.RoutingServiceTransmitSucceededIsEnabled())
{
TD.RoutingServiceTransmitSucceeded(this.messageRpc.EventTraceActivity, this.messageRpc.UniqueID, "0", this.currentClient.Key.ToString());
}
if (responseMsg == null || !responseMsg.IsFault)
{
if (TD.RoutingServiceSendingResponseIsEnabled())
{
string action = (responseMsg != null) ? responseMsg.Headers.Action : string.Empty;
TD.RoutingServiceSendingResponse(this.messageRpc.EventTraceActivity, action);
}
}
else
{
if (TD.RoutingServiceSendingFaultResponseIsEnabled()) { TD.RoutingServiceSendingFaultResponse(this.messageRpc.EventTraceActivity, responseMsg.Headers.Action); }
}
this.replyMessage = responseMsg;
completeSelf = true;
if (TD.RoutingServiceCompletingTwoWayIsEnabled()) { TD.RoutingServiceCompletingTwoWay(this.messageRpc.EventTraceActivity); }
return completeSelf;
}
internal static Message End(IAsyncResult result)
{
ProcessRequestAsyncResult<TContract> processRequest = AsyncResult.End<ProcessRequestAsyncResult<TContract>>(result);
return processRequest.replyMessage;
}
bool HandleClientOperationFailure(Exception exception)
{
SendOperation sendOperation = this.messageRpc.Operations[0];
if (TD.RoutingServiceTransmitFailedIsEnabled()) { TD.RoutingServiceTransmitFailed(this.messageRpc.EventTraceActivity, sendOperation.CurrentEndpoint.ToString(), exception); }
if (!(exception is CommunicationException || exception is TimeoutException))
{
//We only move to backup for CommunicationExceptions and TimeoutExceptions
return false;
}
if ((exception is CommunicationObjectAbortedException || exception is CommunicationObjectFaultedException) &&
!this.service.ChannelExtension.HasSession)
{
// Messages on a non sessionful channel share outbound connections and can
// fail due to other messages failing on the same channel
if (messageRpc.Transaction == null && !this.abortedRetry)
{
//No session and non transactional, retry the message 1 time (before moving to backup)
this.abortedRetry = true;
return true;
}
}
else if (exception is EndpointNotFoundException)
{
// The channel may not fault for this exception for bindings other than netTcpBinding
// We abort the channel in that case. We proactively clean up so that we don't have to cleanup later
SessionChannels sessionChannels = this.service.GetSessionChannels(this.messageRpc.Impersonating);
if (sessionChannels != null)
{
sessionChannels.AbortChannel(sendOperation.CurrentEndpoint);
}
}
else if (exception is MessageSecurityException)
{
// The service may have been stopped and restarted without the routing service knowledge.
// When we try to use a cached channel to the service, the channel can fault due to this exception
// The faulted channel gets cleaned up and we retry one more time only when service has backup
// If there is no backup, we do not retry since we do not create a buffered message to prevent performance degradation
if (!this.abortedRetry && (sendOperation.AlternateEndpointCount > 0))
{
this.abortedRetry = true;
return true;
}
}
else if (exception is ProtocolException)
{
// This exception may happen when the current cached channel was closed due to end service recycles.
// We abort the channel in this case and clean it up from the session.
// We will then retry the request one more time only. In retried request, it will create a new channel because the cached channel has been cleaned up.
if (!this.abortedRetry)
{
SessionChannels sessionChannels = this.service.GetSessionChannels(this.messageRpc.Impersonating);
if (sessionChannels != null)
{
this.abortedRetry = true;
sessionChannels.AbortChannel(sendOperation.CurrentEndpoint);
return true;
}
}
}
if (sendOperation.TryMoveToAlternate(exception))
{
if (TD.RoutingServiceMovedToBackupIsEnabled())
{
TD.RoutingServiceMovedToBackup(this.messageRpc.EventTraceActivity, messageRpc.UniqueID, "0", sendOperation.CurrentEndpoint.ToString());
}
return true;
}
return false;
}
}
}
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