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https://issues.apache.org/jira/browse/MNG-8007?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17805735#comment-17805735
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ASF GitHub Bot commented on MNG-8007:
-------------------------------------

cstamas merged PR #1371:
URL: https://github.com/apache/maven/pull/1371




> Make Maven transfer listener used with Resolver more concurrent friendly
> ------------------------------------------------------------------------
>
>                 Key: MNG-8007
>                 URL: https://issues.apache.org/jira/browse/MNG-8007
>             Project: Maven
>          Issue Type: Improvement
>          Components: Artifacts and Repositories
>            Reporter: Tamas Cservenak
>            Assignee: Tamas Cservenak
>            Priority: Major
>             Fix For: 4.0.0, 4.0.0-alpha-11
>
>
> Current console transfer listener used in Maven has all method 
> {{synchronized}}. This becomes a problem as resolver is more and more 
> parallelized, and threads from it sending events are getting in race 
> condition for maven listener monitor.
> One possibility would be to implement a "demuxer" listener, that wraps 
> another listener: it receives even from multiple threads events, returns 
> fast, but passes the incoming events on single thread to wrapped listener. 
> This makes resolver relieve a bit, but also keeps actual listener simple, as 
> it can be coded single threaded.



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