[jira] [Assigned] (UIMA-6399) RutaPatternCache prevents CPEEngine from terminating

["Richard Eckart de Castilho (Jira)" <de...@uima.apache.org>]

     [ https://issues.apache.org/jira/browse/UIMA-6399?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Richard Eckart de Castilho reassigned UIMA-6399:
------------------------------------------------

    Assignee: Richard Eckart de Castilho

> RutaPatternCache prevents CPEEngine from terminating
> ----------------------------------------------------
>
>                 Key: UIMA-6399
>                 URL: https://issues.apache.org/jira/browse/UIMA-6399
>             Project: UIMA
>          Issue Type: Bug
>          Components: Ruta
>            Reporter: Richard Eckart de Castilho
>            Assignee: Richard Eckart de Castilho
>            Priority: Major
>         Attachments: Screenshot 2021-12-10 at 17.38.08.png
>
>
> The {{RutaPatternCache}} creates a Caffeine cache internally which spawns a cleanup worker thread. If this thread is spawed while Ruta is running in a CPE, then the thread is added to the CPE's thread group. When the CPE is done processing, it waits for all the worker threads in its group to terminate. Normally, these are only the reader thread, the processor threads, the consumer thread, and the thread-group destroyer thread. The extra thread added via Caffeine causes the thread-group destroyer to believe that there are still workers running and thus it will never terminate the CPEEngine. That means, the engines and resources used in the engine will never be GCed.
>  !Screenshot 2021-12-10 at 17.38.08.png|width=50%! 



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