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https://issues.apache.org/jira/browse/UIMA-1149?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Jerry Cwiklik reopened UIMA-1149:
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Assignee: Jerry Cwiklik
Synchronize access to FlowContainer next() method. This method executes user
code that may not be thread safe
> [UIMA-AS] fix potential thread safety issue with flow controller code
> ---------------------------------------------------------------------
>
> Key: UIMA-1149
> URL: https://issues.apache.org/jira/browse/UIMA-1149
> Project: UIMA
> Issue Type: Bug
> Components: Async Scaleout
> Affects Versions: 2.2.2AS
> Reporter: Marshall Schor
> Assignee: Jerry Cwiklik
> Priority: Minor
> Fix For: 2.3AS
>
> Attachments: uimaj-as-core-UIMA-1149-patch.txt
>
>
> The general "contract" regarding threading for user-written UIMA components
> is that components do not have to be written to be thread-safe, or, more
> precisely, the framework guarantees it will not call an instance of a
> user-written component class on multiple threads at the same time. See
> http://incubator.apache.org/uima/downloads/releaseDocs/2.2.2-incubating/docs/html/tutorials_and_users_guides/tutorials_and_users_guides.html#ugr.tug.aae.contract_for_annotator_methods
> This is intended to make writing UIMA components by our user community
> easier, and to eliminate many hard-to-diagnose issues that could occur
> otherwise.
> The FlowController main object class, the one that is specified in the custom
> flow control specification for an aggregate, in UIMA-AS, can be (we think,
> but to be investigated :-) ) be called on multiple threads at the same time,
> in the current implementation. This Jira is to fix this, by synchronizing on
> the flow controller object so that users don't have to write thread safe
> implementations of this class.
> Also, the docs in the above referenced manual should be updated to include
> the flow controller object in the set of objects where the framework
> guarantees that instances of this object will not be called on multiple
> threads at the same time.
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