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From "Mathew Kuppe (JIRA)" <j...@apache.org>
Subject [jira] Commented: (AMQ-871) Allow MessageEvictionStrategy to evict more than one MessageReference in evictMessage(LinkedList message) method
Date Wed, 09 Aug 2006 04:24:23 GMT
    [ https://issues.apache.org/activemq/browse/AMQ-871?page=comments#action_36715 ] 
            
Mathew Kuppe commented on AMQ-871:
----------------------------------

Note one obvious side-effect of this change is that it will allow the evictMessage method
to return an empty array and thereby not removing any messages from the pending message list.

> Allow MessageEvictionStrategy to evict more than one MessageReference in evictMessage(LinkedList
message) method
> ----------------------------------------------------------------------------------------------------------------
>
>                 Key: AMQ-871
>                 URL: https://issues.apache.org/activemq/browse/AMQ-871
>             Project: ActiveMQ
>          Issue Type: Improvement
>          Components: Broker
>            Reporter: Mathew Kuppe
>         Attachments: evictMultipleMessages-patch.txt
>
>
> For slow consumers every time a single message is added to a TopicSubscription where
the pending message limit is reached, a new call to evictMessage is made. To allow for more
flexible and efficient means of evicting messages it would be nice to be able to evict multiple
messages in one call to evictMessage. This allows new MessageEvictionStrategy implementations
to evict based on age of messages (eg. evict all messages in the pending message list that
are older than x ms), duplicate messages (evict all messages that are redundant based on newer
messages currently in the pending message list) etc. As a single call to the evictMessage
method may have the opportunity to reduce the size of the pending message list by more than
one it means that the next message added to the TopicSubscription may not need to have to
call the evictMessage again.

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