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From "Hiram Chirino (Resolved) (JIRA)" <j...@apache.org>
Subject [jira] [Resolved] (APLO-100) Support a `include-seq` and `from-seq` option on the `SUBSCRIBE` frame to finely control from where in a queue a subscription starts from.
Date Mon, 05 Dec 2011 23:44:41 GMT

     [ https://issues.apache.org/jira/browse/APLO-100?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Hiram Chirino resolved APLO-100.
--------------------------------

    Resolution: Fixed
    
> Support a `include-seq` and `from-seq` option on the `SUBSCRIBE` frame to finely control
from where in a queue a subscription starts from.
> ------------------------------------------------------------------------------------------------------------------------------------------
>
>                 Key: APLO-100
>                 URL: https://issues.apache.org/jira/browse/APLO-100
>             Project: ActiveMQ Apollo
>          Issue Type: New Feature
>          Components: apollo-broker
>            Reporter: Hiram Chirino
>            Assignee: Hiram Chirino
>             Fix For: 1.0-beta6
>
>
> As messages are added to a queue in a broker, they are assigned an incrementing
> sequence number.  Messages delivered to subscribers can be updated to include
> the sequence number if the `include-seq` header is added to the `SUBSCRIBE`
> frame.  This header should be set to a header name which will be added
> messages delivered to hold value of the sequence number.
> Example:
>     SUBSCRIBE
>     id:mysub
>     destination:/queue/foo
>     include-seq:seq
>     
>     ^@
> Then you can expect to receive messages like:
>     MESSAGE
>     subscription:mysub
>     destination:/queue/foo
>     seq:1
>     
>     Hello
>     ^@
>     MESSAGE
>     subscription:mysub
>     destination:/queue/foo
>     seq:2
>     
>     World
>     ^@
> Furthermore, you configure the `SUBSCRIBE` frame so that the subscription
> only receives messages that have a sequence id that is equal to or greater 
> than a requested value by using the `from-seq` header.  Example:
>     SUBSCRIBE
>     id:mysub
>     destination:/queue/foo
>     from-seq:10
>     
>     ^@
> If the `from-seq` is set to `-1`, then the subscription will receive messages
> from the tail of the queue.  In other words, it will only receive new messages sent 
> to the queue.
> Note: You can only use the `from-seq` header with normal destinations.  If you 
> attempt to use it with a wildcard or composite destination then the connection
> will be closed due to invalid usage.

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