Tutorial should include example for asynchronous handling
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Key: EXEC-42
URL: https://issues.apache.org/jira/browse/EXEC-42
Project: Commons Exec
Issue Type: Improvement
Reporter: Konrad Windszus
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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