private void ReceiveMessage(object context)
{
int sleepTime = 1;
while (shouldContinue)
{
Thread.Sleep(sleepTime);
try
{
using (var tx = _sqlQueueManager.BeginTransaction())
{
if (!_sqlQueueManager.Peek(_queueId))
{
sleepTime += 100;
sleepTime = Math.Min(sleepTime, SleepMax);
continue;
}
sleepTime = 1;
tx.Transaction.Commit();
}
}
catch (TimeoutException)
{
logger.DebugFormat("Could not find a message on {0} during the timeout period.",
queueEndpoint);
continue;
}
catch (SqlException e)
{
logger.Warn("Could not get message from database.", e);
continue;
}
catch (ObjectDisposedException)
{
logger.DebugFormat("Shutting down the transport for {0} thread {1}.", queueEndpoint, context);
return;
}
catch (InvalidOperationException e)
{
logger.Error(
"An error occured while recieving a message, clearing connection pool and make a new attempt after some sleep.", e);
SqlConnection.ClearAllPools();
sleepTime = SleepMax;
continue;
}
catch (Exception e)
{
logger.Error(
"An error occured while recieving a message, shutting down message processing thread",
e);
return;
}
if (shouldContinue == false)
{
return;
}
Message message;
try
{
using (var tx = _sqlQueueManager.BeginTransaction())
{
message = _sqlQueueManager.Receive(_queueId, TimeSpan.FromSeconds(10));
tx.Transaction.Commit();
}
}
catch (TimeoutException)
{
logger.DebugFormat("Could not find a message on {0} during the timeout period",
queueEndpoint);
continue;
}
catch (SqlException e)
{
logger.Debug("Could not get message from database.",
e);
continue;
}
catch (InvalidOperationException e)
{
logger.Error(
"An error occured while recieving a message, clearing connection pool and make a new attempt after some sleep.", e);
SqlConnection.ClearAllPools();
sleepTime = SleepMax;
continue;
}
catch (Exception e)
{
logger.Error(
"An error occured while recieving a message, shutting down message processing thread",
e);
return;
}
if (message.ProcessedCount > numberOfRetries)
{
using (var tx = _sqlQueueManager.BeginTransaction())
{
Queue.MoveTo(SubQueue.Errors.ToString(), message);
Queue.EnqueueDirectlyTo(SubQueue.Errors.ToString(), new MessagePayload
{
SentAt = DateTime.UtcNow,
Data = null,
Headers = new NameValueCollection
{
{
"correlation-id", message.Id.ToString()
},
{
"retries", message.ProcessedCount.ToString(CultureInfo.InvariantCulture)
}
}
});
tx.Transaction.Commit();
}
continue;
}
var messageWithTimer = new MessageWithTimer {
Message = message
};
var messageProcessingTimer = new Timer(extendMessageLeaaseIfMessageStillInProgress, messageWithTimer,
TimeSpan.FromSeconds(40), TimeSpan.FromMilliseconds(-1));
messageWithTimer.Timer = messageProcessingTimer;
try
{
var msgType = (MessageType)Enum.Parse(typeof(MessageType), message.Headers["type"]);
logger.DebugFormat("Starting to handle message {0} of type {1} on {2}",
message.Id,
msgType,
queueEndpoint);
switch (msgType)
{
case MessageType.AdministrativeMessageMarker:
ProcessMessage(message,
AdministrativeMessageArrived,
AdministrativeMessageProcessingCompleted,
null,
null);
break;
case MessageType.ShutDownMessageMarker:
//ignoring this one
using (var tx = _sqlQueueManager.BeginTransaction())
{
_sqlQueueManager.MarkMessageAsReady(message);
tx.Transaction.Commit();
}
break;
case MessageType.TimeoutMessageMarker:
var timeToSend = XmlConvert.ToDateTime(message.Headers["time-to-send"],
XmlDateTimeSerializationMode.Unspecified);
if (timeToSend > DateTime.Now)
{
timeout.Register(message);
using (var tx = queue.BeginTransaction())
{
queue.MoveTo(SubQueue.Timeout.ToString(), message);
tx.Transaction.Commit();
}
}
else
{
ProcessMessage(message,
MessageArrived,
MessageProcessingCompleted,
BeforeMessageTransactionCommit,
BeforeMessageTransactionRollback);
}
break;
default:
ProcessMessage(message,
MessageArrived,
MessageProcessingCompleted,
BeforeMessageTransactionCommit,
BeforeMessageTransactionRollback);
break;
}
}
catch (Exception exception)
{
logger.Debug("Could not process message", exception);
}
message.FinishedProcessing = true;
}
}
