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https://issues.apache.org/jira/browse/CAMEL-3424?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13018843#comment-13018843
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Claus Ibsen commented on CAMEL-3424:
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Okay I settled for a new attribute: skipDuplicate. Which you can set to false
to allow duplicates, and then filter those in the route and handle differently.
Thera are examples in the eip wiki page.
> IdempotentConsumer EIP - Make it easier for end users to dicate onDuplicate
> ---------------------------------------------------------------------------
>
> Key: CAMEL-3424
> URL: https://issues.apache.org/jira/browse/CAMEL-3424
> Project: Camel
> Issue Type: New Feature
> Components: camel-core
> Reporter: Claus Ibsen
> Assignee: Claus Ibsen
> Fix For: 2.8.0, 3.0.0
>
>
> Currently you would have to subclass IdempotentConsumer and add custom logic
> in {{onDuplicateMessage}}.
> End users may want to let some duplicates pass-through. So maybe we should
> have {{onDuplicateMessage}} return a boolean so we can determine what to do.
> If it returns {{false}} (default) the message will be dropped. If it returns
> {{true}} the message is allowed and is continued to route.
> We should then allow to set a custom predicate which can determine the
> onDuplicateMessage logic.
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