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https://issues.apache.org/jira/browse/JCR-1672?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12617388#action_12617388
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Tobias Bocanegra commented on JCR-1672:
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IMO isExternal() is a good choice, since it not entirely tied to a cluster 
setup. It just specifies that the
underlying data was changed but the modification did not go through 'this' 
repository. theoretically one could modify the values in the DB directly and 
then send such an event (which is of course discouraged :-).

> Adding Event interface and isLocal()
> ------------------------------------
>
>                 Key: JCR-1672
>                 URL: https://issues.apache.org/jira/browse/JCR-1672
>             Project: Jackrabbit
>          Issue Type: Improvement
>          Components: jackrabbit-api, jackrabbit-core
>    Affects Versions: 1.4
>            Reporter: Carsten Ziegeler
>             Fix For: 1.5
>
>         Attachments: jackrabbit.patch, localeventlistener.patch
>
>
> when a repository cluster is used, it seems that a common problem many people 
> have is to detect if an observation event is send because of changes on the 
> local instance or a remote instance of the cluster.
> This is especially important if you want to do post processing of data
> based on observation (the post processing should only be done by one instance 
> in the cluster).
> A current solution is to cast the jcr event object to the EventImpl of 
> jackrabbit core which is obviously not a nice solution :)
> So what about adding an event interface to jackrabbit api which extends the 
> jcr event interface and adds the isLocal() method? 

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