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From "Jim Gomes (JIRA)" <jira+amq...@apache.org>
Subject [jira] Updated: (AMQNET-248) Duplicate MessageID received.
Date Fri, 23 Apr 2010 22:37:26 GMT

     [ https://issues.apache.org/activemq/browse/AMQNET-248?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Jim Gomes updated AMQNET-248:
-----------------------------

    Component/s: Stomp
                     (was: NMS)

> Duplicate MessageID received.
> -----------------------------
>
>                 Key: AMQNET-248
>                 URL: https://issues.apache.org/activemq/browse/AMQNET-248
>             Project: ActiveMQ .Net
>          Issue Type: Bug
>          Components: Stomp
>    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.
> {code}
> 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);
> }
> {code}
> 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.
> {code}
>         public string NMSMessageId
>         {
>             get
>             {
>                 if(null != MessageId)
>                 {
>                     return MessageId.ProducerId.ConnectionId + ":" +
>                            MessageId.ProducerId.SessionId + ":" +
>                            MessageId.ProducerId.Value;
>                 }
>                 return String.Empty;
>             }
> {code}
> 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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