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From "Robbie Gemmell (JIRA)" <j...@apache.org>
Subject [jira] [Created] (QPID-5223) [Java 0-x Client] add system property to set message expiration header as raw TTL value for users using RabbitMQ
Date Sun, 13 Oct 2013 21:16:41 GMT
Robbie Gemmell created QPID-5223:
------------------------------------

             Summary: [Java 0-x Client] add system property to set message expiration header
as raw TTL value for users using RabbitMQ
                 Key: QPID-5223
                 URL: https://issues.apache.org/jira/browse/QPID-5223
             Project: Qpid
          Issue Type: Improvement
          Components: Java Client
            Reporter: Robbie Gemmell
            Assignee: Robbie Gemmell
            Priority: Minor
             Fix For: 0.25


The AMQP 0-8/0-9/0-9-1 specifications leave the behaviour of the message 'expiration' field
undefined, indicating only that is is a string(!) value for application usage. Qpid's Java
broker and AMQP 0-x client have for several years used this field to support the JMSExpiration
property  when ttl is >0 by setting the value as  <current time in millis + ttl>.


As per discussion in QPID-5184, when 'per-message-ttl' support was added to RabbitMQ in its
recent 3.x releases it then began interpreting the message 'expiration' header, however treating
it instead as a direct TTL value rather than the time of expiration.

Although QPID-5184 resolved the issue seen when using the Qpid client to send to RabbitMQ
when no TTL has been set (as result of it sending an empty expiration string rather than none
at all), it does not address a related failure that will occur if a TTL actually is set. As
RabbitMQ interprets the field as a TTL instead of expiration point, the actual expiration
value sent is too large for RabbitMQ to accept (and wouldn't produce the desired behaviour
it it was). To enable messages sent to RabbitMQ with TTL to be accepted and produce the desired
TTL behaviour, the raw TTL value would need to be sent instead.

A system property will be added to enable the client set the expiration header as the raw
TTL value (for non-zero TTL values) during send() operations.



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