/// <summary>
/// Start the listen to the queue for incoming messages and
/// notifiy the handlers as new messges arrive
/// </summary>
public void StartQueueListener()
{
//create a separate connection to the message queue
queueListenerStarted = true;
MQQueueManager listenermqm = (MQQueueManager)queueSession.AccessQueueManager(queueManager);
MQQueue listenerqueue = (MQQueue)mqm.AccessQueue(QueueName, (int)MQ.MQOO_INPUT_AS_Q_DEF + (int)MQ.MQOO_OUTPUT, "", "", "");
listenerqueue.Open();
try
{
MQMessage message = (MQMessage)queueSession.AccessMessage();
MQGetMessageOptions messageOption = (MQGetMessageOptions)queueSession.AccessGetMessageOptions();
while (queueListenerStarted == true)
{
System.Threading.Thread.Sleep(sleepTime);
if (handler.GetInvocationList().Length > 0)
{
try
{
//GET will raise an exception if no message is in the queue.
//we want to keep listening despite of the exception, see exception block
//for detail
listenerqueue.Get(message, messageOption, System.Reflection.Missing.Value);
SAF.MessageQueue.Message safMessage = new SAF.MessageQueue.Message();
safMessage.Label = message.MessageId;
safMessage.Content = message.ReadString(message.MessageLength);
//fire the event
handler(safMessage, QueueName);
}
catch (System.Runtime.InteropServices.COMException ex)
{
//-2147467259 represents the error code for retrieving
//message from an empty queue. do nothing if gotting this error code.
if (ex.ErrorCode != -2147467259)
{
throw ex;
}
}
}
}
}
finally
{
//close the connetion
listenerqueue.Close();
listenermqm.Disconnect();
}
}
