Hi
Lets start the discussions on the design of commons-exec. I'll start by
describing the Ant implementation that I think is the most mature out
there. I also think it contains the bits that would be approriate for
this package.
This is a very short description of the cleaned up Ant exec task design:
* Exec: the former Ant task class used to create and configure Execute
instances. Now mainly a convience class for starting new Execute instances.
* Execute: the main class for running one process. Handles creation and
configuration of the necessary objects (stream pump, watchdog, process
destroyer). Can wait for the full execution time to enable synchronous
return of the process return code or spawn a process to run async.
* Process destroyer: adds itself as a shutdown hook, Execute adds and
removes created processes to ensure that they are correctly destroyed
when the JVM stops.
* WatchDog: used to time out a running process. After a given time has
passed, the process is checked if it's still running and there after
destroyed.
* CommandLauncher: a family of classes for actually starting the
processes. Implementations exist for e.g. Java 1.1, Java 1.3, WinNT,
Mac, VMS and so on. These classes handles the platform specifics.
* Environment: used to retrive the current environment as well as
setting new environment variables. Reading the current environment is
done using platform specific commands (e.g. "cmd /c set", "env",
"/bin/env") and parsing the result. This could of course be improved on
J2SE 5.0 to use System.getenv() instead.
* StreamPumper: used to read/write the three stream (in, out, error)
simultaniously.
* CommandLine: class for handling (e.g. parsing, quoting) command lines.
There are additional classes but the list above are those of main interest.
* Do you think this fits with what you would find appropriate and useful
for commons-exec?
* Would it be a good starting point (if so I'll create a patch for the
code I've cleaned up and removed the Ant specifics from)?
* Should I put this on the wiki for further discussions?
/niklas
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Niklas Gustavsson
[EMAIL PROTECTED]
http://www.protocol7.com
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