[jira] [Commented] (ARIES-1941) Thread unsafe iteration of thread-safe MultiMap by TopologyManagerImport

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    [ https://issues.apache.org/jira/browse/ARIES-1941?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16970968#comment-16970968 ] 

ASF subversion and git services commented on ARIES-1941:
--------------------------------------------------------

Commit f14ba9d7a13eedbb5a9195e87a6e8f9417de3369 in aries-rsa's branch refs/heads/master from Arnoud Glimmerveen
[ https://gitbox.apache.org/repos/asf?p=aries-rsa.git;h=f14ba9d ]

ARIES-1941 Addressed synchronization inconsistency in (using) MultiMap (#31)

* ARIES-1941 Addressed synchronization inconsistency in (using) MultiMap

Changed the approach to MultiMap to have all public method thread-safe: using synchronized keyword *and* returning read-only *copies* when a Set is to be returned
Changed the one case where a defensive copy was made. Note that this old approach was not thread-safe, as the copy-constructors' iterator could be 'tripped' by a concurrent modification.

* With the change to regular HashMap, a defensive copy of keySet is needed.


> Thread unsafe iteration of thread-safe MultiMap by TopologyManagerImport
> ------------------------------------------------------------------------
>
>                 Key: ARIES-1941
>                 URL: https://issues.apache.org/jira/browse/ARIES-1941
>             Project: Aries
>          Issue Type: Bug
>          Components: Remote Service Admin
>    Affects Versions: rsa-1.14.0
>            Reporter: Arnoud Glimmerveen
>            Assignee: Christian Schneider
>            Priority: Major
>             Fix For: rsa-1.15.0
>
>          Time Spent: 20m
>  Remaining Estimate: 0h
>
> The TopologyMangerImport class uses the MultiMap (Map<String, Set<T>>). The operations on the MultiMap itself are thread safe (by means of synchronised keyword), however in some cases the Set<T> value is obtained and iterated over, without holding the right mutex. As a result you may see ConcurrentModificationExceptions.



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