[infinispan-issues] [JBoss JIRA] (ISPN-2394) Introduce an event to signal end of state transfer

[Dan Berindei (JIRA)]

    [ https://issues.jboss.org/browse/ISPN-2394?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12726380#comment-12726380 ] 

Dan Berindei commented on ISPN-2394:
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I think the existing {{TopologyChanged}} event is fine, we just need to modify it to contain the initial and final {{CacheTopology}}. That way a listener can check if the pending CH is {{null}} in the final topology and conclude that state transfer has finished.
                
> Introduce an event to signal end of state transfer
> --------------------------------------------------
>
>                 Key: ISPN-2394
>                 URL: https://issues.jboss.org/browse/ISPN-2394
>             Project: Infinispan
>          Issue Type: Task
>          Components: State transfer
>    Affects Versions: 5.2.0.ALPHA1
>            Reporter: Adrian Nistor
>            Assignee: Adrian Nistor
>             Fix For: 5.2.0.CR1
>
>
> Since NBST was introduced the actual completion of state transfer happens later than the TopologyChangedEvent. In unit tests there is currently no simple way to find out when this actually happens so we resorted to some ugly polling (see TestingUtil.waitForRehashToComplete()). Also some other core components could benefit from such an event (eg. StaleTransactionCleanupService, see ISPN-2383).  
> The event should contain the CacheTopology that is being confirmed as stable.

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