void ITransport.ClearTimeout(string timeoutCorrelationID)
{
var transaction = openTransaction; // check for "ambient" transaction on current thread
var commitAndDisposeTransaction = false;
if (transaction == null)
{
transaction = BeginTransaction();
commitAndDisposeTransaction = true;
}
try
{
var conversationHandle = Guid.Parse(timeoutCorrelationID);
if (PopTimeoutMessage(transaction, conversationHandle) != null)
{
ServiceBrokerWrapper.EndConversation(transaction, conversationHandle);
}
if (commitAndDisposeTransaction)
{
transaction.Commit();
}
}
finally
{
if (commitAndDisposeTransaction)
{
TryDisposeTransactionAndConnection(transaction);
}
}
}
public int PeekCount()
{
var transaction = openTransaction; // check for "ambient" transaction on current thread
var commitAndDisposeTransaction = false;
if (transaction == null)
{
transaction = BeginTransaction();
commitAndDisposeTransaction = true;
}
try
{
var count = ServiceBrokerWrapper.QueryMessageCount(transaction, ServiceBrokerQueue, ServiceBrokerMessageType);
if (commitAndDisposeTransaction)
{
transaction.Commit();
}
return(count);
}
finally
{
if (commitAndDisposeTransaction)
{
TryDisposeTransactionAndConnection(transaction);
}
}
}
private void InitServiceBroker()
{
using (var connection = OpenConnection())
using (var transaction = connection.BeginTransaction())
{
// Ensure the service and queue exist
ServiceBrokerWrapper.CreateServiceAndQueue(transaction, ServiceBrokerService, ServiceBrokerQueue, ServiceBrokerMessageType, ServiceBrokerContract);
transaction.Commit();
}
}
private void TryReceiveMessage()
{
// NOTE this method _should not_ throw an exception!
ServiceBrokerMessage message = null;
SqlTransaction transaction = null;
try
{
transaction = BeginTransaction();
logger.Debug("RECEIVE FROM {0}", ServiceBrokerQueue);
message = ServiceBrokerWrapper.WaitAndReceive(transaction, ServiceBrokerQueue, waitTimeout);
}
catch (Exception e)
{
logger.Error(e, "Exception caught trying to receive from queue {0}. Rolling back and backing off before reconnecting.", ServiceBrokerQueue);
TryRollbackTransaction(transaction);
TryDisposeTransactionAndConnection(transaction);
workerThreadPool.Release(1);
Thread.Sleep(1000); // back-off because we will return and loop immediately
return;
}
// No message? That's okay
if (message == null)
{
try
{
transaction.Commit();
}
finally
{
TryDisposeTransactionAndConnection(transaction);
workerThreadPool.Release(1);
}
return;
}
// start a
Task.Run(() =>
{
// TryHandleHessage _should not_ throw an exception. It will also commit and cleanup the transactions
try
{
TryHandleMessage(transaction, message);
}
finally
{
workerThreadPool.Release(1); // release this semaphore back to the pool regardless of what happened
}
});
}
void ITransport.Send(OutgoingTransportMessage transportMessage, IEnumerable <string> destinations)
{
var transaction = openTransaction; // check for "ambient" transaction on current thread
var commitAndDisposeTransaction = false;
if (transaction == null)
{
transaction = BeginTransaction();
commitAndDisposeTransaction = true;
}
try
{
transportMessage.Headers[StandardHeaders.TimeSent] = DateTime.UtcNow.ToString("o");
transportMessage.Headers[StandardHeaders.ReplyToAddress] = this.ServiceBrokerService;
transportMessage.Headers[StandardHeaders.OriginatingAddress] = this.ServiceBrokerService;
using (var stream = new MemoryStream())
{
FastXmlTransportMessageSerializer.Serialize(transportMessage, stream);
var messageBuffer = stream.ToArray();
foreach (var destination in destinations)
{
var conversationHandle = ServiceBrokerWrapper.SendOne(transaction, ServiceBrokerService, destination, ServiceBrokerContract, ServiceBrokerMessageType, messageBuffer);
#if DEBUG
logger.Debug(string.Format("Sending message {0} with Handle {1} to Service Named {2}.",
transportMessage.Message.GetType().AssemblyQualifiedName,
conversationHandle,
destination));
logger.Debug(string.Format("ToString() of the message yields: {0}\n" +
"Message headers:\n{1}",
transportMessage.Message.ToString(),
string.Join(", ", transportMessage.Headers.Select(h => h.Key + ":" + h.Value).ToArray())));
#endif
}
}
if (commitAndDisposeTransaction)
{
transaction.Commit();
}
}
finally
{
if (commitAndDisposeTransaction)
{
TryDisposeTransactionAndConnection(transaction);
}
}
}
private void TryHandleMessageInner(SqlTransaction transaction, ServiceBrokerMessage message)
{
// Only handle transport messages
if (message.MessageTypeName != ServiceBrokerMessageType &&
!message.IsDialogTimerMessage())
{
logger.Debug("Ignoring message of type {0} from queue {1}", message.MessageTypeName, ServiceBrokerQueue);
return; // ignore
}
IncomingTransportMessage transportMessage = null;
try
{
if (message.IsDialogTimerMessage())
{
transportMessage = TryLoadDialogTimerTimeoutMessage(transaction, message);
}
else
{
transportMessage = TryDeserializeTransportMessage(message);
}
if (!transportMessage.Headers.ContainsKey(StandardHeaders.OriginatingAddress))
{
transportMessage.Headers[StandardHeaders.OriginatingAddress] = ServiceBrokerWrapper.TryGetConversationFarService(transaction, message.ConversationHandle);
}
Exception lastException = null;
if (faultManager.MaxRetriesExceeded(transportMessage, out lastException))
{
logger.Debug("MaxRetriesExceeded: Moving message {0} from queue {1} to poison message table.", message.ConversationHandle.ToString(), ServiceBrokerQueue);
MoveToPoisonMessage(transaction, message, transportMessage, lastException, "MaxRetriesExceeded", MaxRetries);
return; // return without error to commit transaction
}
logger.Debug("Notifying observers of new TransportMessage for message {0} from queue {1}.", message.ConversationHandle, ServiceBrokerQueue);
if (this.MessageAvailable != null)
{
this.MessageAvailable(this, new MessageAvailable(transportMessage));
}
}
catch (CannotDeserializeMessageException e)
{
// If we can't deserialize the transport message or inner message, there is no reason to retry.
// note: error is already logged so we don't need to log here
logger.Debug("DeserializeError: Moving message {0} from queue {1} to poison message table.", message.ConversationHandle.ToString(), ServiceBrokerQueue);
MoveToPoisonMessage(transaction, message, transportMessage, e, "DeserializeError", 0);
return; // return without error to commit transaction
}
}
string ITransport.RequestTimeoutMessage(int secondsToWait, OutgoingTransportMessage transportMessage)
{
var transaction = openTransaction; // check for "ambient" transaction on current thread
var commitAndDisposeTransaction = false;
if (transaction == null)
{
transaction = BeginTransaction();
commitAndDisposeTransaction = true;
}
try
{
transportMessage.Headers[StandardHeaders.TimeSent] = DateTime.UtcNow.ToString("o");
transportMessage.Headers[StandardHeaders.ReplyToAddress] = this.ServiceBrokerService;
transportMessage.Headers[StandardHeaders.OriginatingAddress] = this.ServiceBrokerService;
var conversationHandle = ServiceBrokerWrapper.BeginConversation(transaction, ServiceBrokerService, ServiceBrokerService);
ServiceBrokerWrapper.BeginTimer(transaction, conversationHandle, secondsToWait);
using (var stream = new MemoryStream())
{
FastXmlTransportMessageSerializer.Serialize(transportMessage, stream);
var messageBuffer = stream.ToArray();
PushTimeoutMessage(transaction, conversationHandle, messageBuffer, secondsToWait);
}
if (commitAndDisposeTransaction)
{
transaction.Commit();
}
return(conversationHandle.ToString());
}
finally
{
if (commitAndDisposeTransaction)
{
TryDisposeTransactionAndConnection(transaction);
}
}
}
private void TryHandleMessage(SqlTransaction transaction, ServiceBrokerMessage message)
{
logger.Debug("Received message {0} from queue {1}", message.ConversationHandle, ServiceBrokerQueue);
// NOTE this method _should not_ throw an exception!
// It is responsible for committing or rolling back the SqlTransaction
// that was passed in.
// We can keep track of the openTransaction on the current thread in case we need it.
openTransaction = transaction;
try
{
// this may throw an exception if we need to rollback
TryHandleMessageInner(transaction, message);
// End the conversation and commit
ServiceBrokerWrapper.EndConversation(transaction, message.ConversationHandle);
transaction.Commit();
faultManager.ClearFailuresForMessage(message.ConversationHandle.ToString());
logger.Debug("Committed message {0} from queue {1}", message.ConversationHandle, ServiceBrokerQueue);
}
catch (Exception e)
{
TryRollbackTransaction(transaction);
faultManager.IncrementFailuresForMessage(message.ConversationHandle.ToString(), e);
logger.Error(e, "Exception caught handling message {0} from queue {1}. Rolling back transaction to retry.", message.ConversationHandle, ServiceBrokerQueue);
#if DEBUG
if (System.Diagnostics.Debugger.IsAttached)
{
System.Diagnostics.Debugger.Break();
}
#endif
}
finally
{
openTransaction = null;
TryDisposeTransactionAndConnection(transaction); // shoud not throw exception
}
}
private void MoveToPoisonMessage(SqlTransaction transaction, ServiceBrokerMessage serviceBrokerMessage, IncomingTransportMessage transportMessage, Exception exception, string errorCode, int retries)
{
var origin_service_name = "";
if (transportMessage != null && transportMessage.Headers.ContainsKey(StandardHeaders.OriginatingAddress))
{
origin_service_name = transportMessage.Headers[StandardHeaders.OriginatingAddress];
}
else if (transportMessage != null && transportMessage.Headers.ContainsKey(StandardHeaders.ReplyToAddress))
{
origin_service_name = transportMessage.Headers[StandardHeaders.ReplyToAddress];
}
else
{
origin_service_name = ServiceBrokerWrapper.TryGetConversationFarService(transaction, serviceBrokerMessage.ConversationHandle);
}
try
{
// write to the message to the PosionMessage table
using (var command = transaction.Connection.CreateCommand())
{
command.CommandText = "spInsertPoisonMessage";
command.CommandType = CommandType.StoredProcedure;
command.Parameters.AddWithValue("@conversation_handle", serviceBrokerMessage.ConversationHandle);
command.Parameters.AddWithValue("@origin_service_name", origin_service_name);
command.Parameters.AddWithValue("@service_name", this.ServiceBrokerService);
command.Parameters.AddWithValue("@queue_name", this.ServiceBrokerQueue);
command.Parameters.AddWithValue("@message_body", serviceBrokerMessage.Body);
command.Parameters.AddWithValue("@retries", retries);
command.Parameters.AddWithValue("@errorCode", errorCode);
if (exception != null)
{
command.Parameters.AddWithValue("@errorMessage", FormatErrorMessage(exception));
}
else
{
command.Parameters.AddWithValue("@errorMessage", DBNull.Value);
}
command.Transaction = transaction;
command.ExecuteNonQuery();
}
}
catch (Exception e)
{
logger.Fatal(e, "Failed to write PoisonMessage for message {0} from queue {1}", serviceBrokerMessage.ConversationHandle, ServiceBrokerQueue);
// suppress -- don't let this exception take down the process
}
if (PoisonMessageDetected != null)
{
PoisonMessageDetected(this, new PoisonMessageDetectedEventArgs()
{
MessageId = serviceBrokerMessage.ConversationHandle.ToString(),
OriginServiceName = origin_service_name,
ServiceName = this.ServiceBrokerService,
QueueName = this.ServiceBrokerQueue,
MessageBody = serviceBrokerMessage.Body,
Retries = retries,
ErrorCode = errorCode,
Exception = exception,
});
}
}
