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From "Anthony RAYMOND (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (IO-535) Thread bug in FileAlterationMonitor
Date Thu, 04 May 2017 21:12:04 GMT

     [ https://issues.apache.org/jira/browse/IO-535?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Anthony RAYMOND updated IO-535:
-------------------------------
    Summary: Thread bug in FileAlterationMonitor  (was: FileAlterationMonitor)

> Thread bug in FileAlterationMonitor
> -----------------------------------
>
>                 Key: IO-535
>                 URL: https://issues.apache.org/jira/browse/IO-535
>             Project: Commons IO
>          Issue Type: Bug
>          Components: Utilities
>    Affects Versions: 2.5
>         Environment: Components managed by a DI Framework
>            Reporter: Anthony RAYMOND
>            Priority: Critical
>              Labels: easyfix, patch, performance
>   Original Estimate: 5m
>  Remaining Estimate: 5m
>
> The thread in FileAlterationMonitor wasn't stopped by the `stop(int)` method, which forbid
application to shutdown until all `Thread` are exited (if FileAlterationMonitor is part of
a DI managed component).
> This behavior conflict with the method javadoc `@param stopInterval the amount of time
in milliseconds to wait for the thread to finish.`
> h5. Simple example to understand
> Bad behavior
> {code:java}
>     Thread t = new Thread(() -> {
>         try {
>             Thread.sleep(500000);
>         } catch (final InterruptedException e) {
>         }
>     });
>     t.start();
>     t.join(50);
>    // Ok, we reach this point until 500000ms are elapsed, but the thread is still alive.
>    //   because Thread#join(int) does not kill the thread. And the thread remains alive.
> {code}
> Good behavior
> {code:java}
>     Thread t = new Thread(() -> {
>         try {
>             Thread.sleep(500000);
>         } catch (final InterruptedException e) {
>         }
>     });
>     t.start();
>     t.join(50);
>     t.interupt();
>    // Thread is exited
> {code}
> In this case, we waited the given time BEFORE exiting the `Thread`, as described in the
javadoc, and the `Thread` is now finished and killed.



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