/// <summary>
/// Process the given message
/// </summary>
/// <param name="message">Transport message to be dispatched to the event handlers</param>
/// <param name="busInstance">Instance of the send bus to inject into the event handlers</param>
/// <returns>True is all event handlers processed successfully</returns>
public MessageProcessingResult ProcessMessage(TransportMessage message, IBus busInstance)
{
if (message == null)
{
throw new ArgumentNullException("message");
}
MessageProcessingResult result = new MessageProcessingResult();
Stopwatch watch = new Stopwatch();
watch.Start();
if (_handlerTypes.ContainsKey(message.MessageType))
{
Log.TraceFormat("Processing {0} handlers for message type {1}", _handlerTypes[message.MessageType].Count, message.MessageTypeName);
var handlerMethod = typeof(IHandleMessage <>).MakeGenericType(message.MessageType).GetMethod("Handle");
using (TransactionScope transactionScope = new TransactionScope(TransactionScopeOption.Required))
{
foreach (Type handlerType in _handlerTypes[message.MessageType])
{
using (IObjectBuilder childBuilder = _objectBuilder.GetNestedBuilder())
{
if (busInstance != null)
{
childBuilder.RegisterInstance <IBus>(busInstance);
}
childBuilder.RegisterInstance(LogManager.GetLogger(handlerType));
Log.TraceFormat("Running handler {0}", handlerType.Name);
try
{
var handler = childBuilder.GetValue(handlerType);
handlerMethod.Invoke(handler, new object[] { message.Message });
}
catch (TargetInvocationException ex)
{
Log.ErrorFormat("Error in handling {0} with {1}", ex, message.MessageType.Name, handlerType.Name);
result.Exception = ex.InnerException ?? ex;
}
catch (Exception ex)
{
Log.ErrorFormat("Error in handling {0} with {1}", ex, message.MessageType.Name, handlerType.Name);
result.Exception = ex;
}
}
}
result.WasSuccessful = result.Exception == null;
if (result.WasSuccessful)
{
transactionScope.Complete();
}
}
}
else
{
Log.WarnFormat("Could not find a handler for {0}", message.MessageTypeName);
result.Exception = new Exception(string.Format("Could not find a handler for {0}", message.MessageTypeName));
}
watch.Stop();
result.Runtime = watch.Elapsed;
return(result);
}
/// <summary>
/// Starts the loop for polling the SQS queue
/// </summary>
public async void Run()
{
Log.InfoFormat("[{0}] Starting message pump", Id);
while (!_cancellationToken.IsCancellationRequested)
{
Log.TraceFormat("[{0}] Starting receiving call", Id);
try
{
IEnumerable <TransportMessage> recievedMessages = await _queue.GetMessages(_cancellationToken.Token);
Log.TraceFormat("[{1}] Received {0} messages", recievedMessages.Count(), Id);
foreach (TransportMessage message in recievedMessages)
{
Log.InfoFormat("[{1}] Received message of type '{0}'", message.MessageTypeName, Id);
_messageLogger.InboundLogMessage(message.Body, message.MessageTypeName, message.Id, message.AttemptNumber);
MessageProcessingResult result;
if (message.MessageParsingSucceeded)
{
Log.TraceFormat("[{0}] Processing message", Id);
result = _messageProcessor.ProcessMessage(message, _bus);
Log.TraceFormat("[{0}] Processed message - Error: {1}", Id, !result.WasSuccessful);
}
else
{
Log.ErrorFormat("[{1}] Failed to parse message of type {0}", message.Exception, message.MessageTypeName, Id);
result = new MessageProcessingResult()
{
WasSuccessful = false, Exception = new Exception("Message parse failure")
};
}
if (result.WasSuccessful)
{
Log.InfoFormat("[{0}] Removing message from the queue", Id);
_queue.RemoveMessage(message);
}
else if (message.AttemptNumber == _messageRetryCount)
{
Log.InfoFormat("[{0}] Message faulted ", Id);
_messageProcessor.ProcessFaultedMessage(message, _bus, result.Exception);
}
MessageStatistics stats = new MessageStatistics()
{
FinalAttempt = message.AttemptNumber == _messageRetryCount,
HandlerRunTime = result.Runtime,
MessageLength = message.Body.Length,
MessageType = message.MessageTypeName,
Success = result.WasSuccessful,
PreviousRetryCount = message.AttemptNumber,
};
_messageProcessor.ProcessMessageStatistics(stats);
}
}
catch (OperationCanceledException)
{
}
catch (Exception ex)
{
Log.ErrorFormat("[{0}] Error occurred in message pump run", ex, Id);
}
}
}
