[jira] Commented: (EXEC-42) Tutorial should include example for asynchronous handling

["Siegfried Goeschl (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/EXEC-42?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12850489#action_12850489 ] 

Siegfried Goeschl commented on EXEC-42:
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Always a good idea to improve the documentation - do you have a draft to start with?

> Tutorial should include example for asynchronous handling
> ---------------------------------------------------------
>
>                 Key: EXEC-42
>                 URL: https://issues.apache.org/jira/browse/EXEC-42
>             Project: Commons Exec
>          Issue Type: Improvement
>            Reporter: Konrad Windszus
>            Assignee: Siegfried Goeschl
>
> I had some difficulties figuring out, how to asynchronously start a process. You should include an example for this on the tutorial page. Especially interesting is the following:
> - How to start it (explain ExecuteResultHandler and that the callbacks are called from another thread, so these should be implemented thread-safe)
> - How to know if it is still running (not possible via watchdog, but has to be implemented for oneself using the ExecuteResultHandler, again watch out for thread safety)
> - How to force to terminate a process (using the watchdog)
> - Add a hint about StreamHandler and that you should always use a PumpStreamHandler (otherwise this could lead to deadlocks, see http://www.javaworld.com/javaworld/jw-12-2000/jw-1229-traps.html?).
> - Add an explanation of exit values, since an exit value which is not in the list of the DefaultExecutor, leads automatically to an exception, which is not clear from the javadocs.

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