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From "Siegfried Goeschl (JIRA)" <j...@apache.org>
Subject [jira] Reopened: (EXEC-42) Tutorial should include example for asynchronous handling
Date Fri, 04 Jun 2010 21:28:59 GMT

     [ https://issues.apache.org/jira/browse/EXEC-42?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Siegfried Goeschl reopened EXEC-42:
-----------------------------------


Thanks - an additional pair of eyes is really helpful ... ;-)

> 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
>    Affects Versions: 1.0, 1.0.1
>            Reporter: Konrad Windszus
>            Assignee: Siegfried Goeschl
>             Fix For: 1.1
>
>
> 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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