[jira] [Closed] (BEAM-3158) DoFnTester should call close() in catch bloc and then re-throw exception to allow using @Rule ExpectedException

["Etienne Chauchot (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/BEAM-3158?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Etienne Chauchot closed BEAM-3158.
----------------------------------
       Resolution: Won't Do
    Fix Version/s: Not applicable

> DoFnTester should call close() in catch bloc and then re-throw exception to allow using @Rule ExpectedException
> ---------------------------------------------------------------------------------------------------------------
>
>                 Key: BEAM-3158
>                 URL: https://issues.apache.org/jira/browse/BEAM-3158
>             Project: Beam
>          Issue Type: Improvement
>          Components: testing
>            Reporter: Etienne Chauchot
>            Assignee: Etienne Chauchot
>            Priority: Minor
>             Fix For: Not applicable
>
>
> In {{CLONE_ONCE}} and {{DO_NOT_CLONE}} cloning behaviors, it is required to explicitly call {{DoFnTester.close()}}. If an exception is raised by the DoFnTester, the user needs to use a try/catch bloc to call DoFnTester.close() himself. If this DoFnTester were doing 
> {code}
> try{
> ...
> } catch(Exception e){
> close();
> throw e;
> }
> {code}
> then the user would no longer need to call {{DoFnTester.close()}} (to release resources, stop threads ...) and thus no longer need the try/catch. This will allow him to use the Junit {{@Rule ExpectedException}} in place of something ugly like 
> {code}
> // need to avoid flow interruption to close the DoFnTester
>     Exception raisedException = null;
>     try {
>       fnTester.processBundle(input);
>     } catch (IOException exception) {
>       raisedException = exception;
>     }
>     fnTester.close();
>     assertTrue(raisedException != null);
> {code}
> But maybe {{DoFnTester}} cannot always be safely closed if a exception was raised.



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