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From "Steve Higgins (JIRA)" <jira+amq...@apache.org>
Subject [jira] Created: (AMQNET-248) Duplicate MessageID received.
Date Fri, 23 Apr 2010 20:43:23 GMT
Duplicate MessageID received.
-----------------------------

                 Key: AMQNET-248
                 URL: https://issues.apache.org/activemq/browse/AMQNET-248
             Project: ActiveMQ .Net
          Issue Type: Bug
          Components: NMS
    Affects Versions: 1.2.0
         Environment: ActiveMQ.NMS 1.2.0 Stomp Protocol
Windows Mobile 5.x
Compact Framework 3.5
            Reporter: Steve Higgins
            Assignee: Jim Gomes


There is a bug which causes duplicate MessageIDs to be received. Note, the Message IDs are
duplicated not the actual messages.  This happens if a producer  sends several messages to
the same queue over the same session.

Note 1: In MessageID.cs SetValue(string messageKey) the producerSequenceId is stripped from
the original unique key when a message is received.

        public void SetValue(string messageKey)
        {
            this.key = messageKey;

            // Parse off the sequenceId
            int p = messageKey.LastIndexOf(":");
            if(p >= 0)
            {
                producerSequenceId = Int64.Parse(messageKey.Substring(p + 1));
                messageKey = messageKey.Substring(0, p);
            }
            producerId = new ProducerId(messageKey);
        }

Note 2: In the Message.cs NMSMessageId get method the unique Id is reconstructed without the
sequence id. Because the sequence id is part of what makes the message id itself unique, multiple
received messages will now have the same id.

        public string NMSMessageId
        {
            get
            {
                if(null != MessageId)
                {
                    return MessageId.ProducerId.ConnectionId + ":" +
                           MessageId.ProducerId.SessionId + ":" +
                           MessageId.ProducerId.Value;
                }

                return String.Empty;
            }


Suggested Fix: The sequenceID should be added back to the MessageId in the above get method
unless I am not seeing other potential problems. 

Better Approach: As a side note, with this approach NMS can't be used with any other message
queue because the current implementation would force the other queues to construct their unique
message ids the same exact way. In bound messages should be void of any message id formatting.
 

Steve


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