Long actions

wxPython Users
1

If your task is fairly complex to get results from, it may be worth
looking at DelayedResult.py (posted Aug 17th), which makes it trivial to
build complex async result post-processing with wx. Simplistic example
(doesn't show the real power of DelayedResult -- chaining transformers):

    import DelayedResult, thread
    
    # this gets called when worker thread done:
    def listener(delayedResult):
        print delayedResult.get()
    
    # create a channel to get result to 'listener'
    channel, port = DelayedResult.byCall(listener)
    
    # create the worker function; you don't have to use
    # decorator if you don't want, it just eliminates
    # some repetitive stuff:
    @ DelayedResult.autoSend()
    def workerFunc():
        # do some stuff
        import time
        time.sleep(3)
        return 'aResult'
    
    # start the worker thread
    sender = channel.getSender()
    thread.start_new_thread( workerFunc, (sender,) )

Oliver

···

-----Original Message-----
From: Brendan Simon [mailto:Brendan@BrendanSimon.com]
Sent: August 24, 2006 4:12 AM
To: wxpython-users@lists.wxwidgets.org
Subject: [wxPython-users] Long actions

I'm writing a GUI frontend for a Configuration Management
System called Aegis. The GUI may have many tabs to view
information about multiple changesets on multiple branches,
etc. On requirement of Aegis is to perform a build. Builds
may take a long time depending on the project (eg. over an
hour). I was planning on using something like "popen("aegis
-build ...") to perform the builds and have the output text
displayed in a text area.

Will this block my GUI from responding until popen finishes?

I want to be able to do multiple builds for different
changesets, as well as other functions such as adding new
changesets, etc.
If popen blocks, then I guess I would have to do something
like run the popen in a different thread. Is that the way to go?

If threads are used, how do I detect new output from popen to
update each text area in "real time" ??

Thanks for any help or pointers.
Brendan.

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