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Posted to dev@activemq.apache.org by "Mathew Kuppe (JIRA)" <ji...@apache.org> on 2006/08/09 06:24:23 UTC

[jira] Commented: (AMQ-871) Allow MessageEvictionStrategy to evict more than one MessageReference in evictMessage(LinkedList message) method

    [ 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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