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From: Oscar Benjamin <oscar.j.benjamin@gmail.com>
Date: Sat, 9 Feb 2013 00:53:47 +0000
Subject: Re: Monitoring updating directory for image for GUI
To: Christopher Rucinski <ciscorucinski@gmail.com>
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 On 8 February 2013 17:09,  <ciscorucinski@gmail.com> wrote:
>> So you have a thread that updates the image and then checks the stack
>> to see if a new image is available? Can you not just have it only try
>> to load the newest image?
>
> That is what I am trying to figure out how to do. I have a counter that u=
pdates with every note that is grabbed from the stream. That counter is pas=
sed into a threaded class that might or might not create the image right aw=
ay...but seems to create them sequentially from what I have seen so far (I =
don't know if that is absolute thought).
>
> Please let me know you thought on the above part! Each new thread should =
only take only a very small amount longer to do than the previous thread th=
at was started...because it has one more note to deal with this time.

Are you creating a new thread for each new note? I imagined that you
would have 3 threads: producer, organiser and consumer. It looks like
this:

# Producer:
for x in produce_music():
    counter +=3D 1
    create_note_file(filename)
    notes_map[filename] =3D counter

# Organiser
def on_file_notify(filename):
    if notes_map[filename] > notes_map[waiting]:
        waiting =3D filename

# Consumer
while True:
    if waiting is not None:
        display(waiting)
        waiting =3D None
    else:
       sleep()

[SNIP]
>
> I am not notified when the file is created...but like I said before, I wa=
it on the subprocess and could do something there.

I don't understand your setup.

>
>> Is that using something like watchdog?
>> http://pypi.python.org/pypi/watchdog
>
> I don't know about Watchdog...but from an earlier version of a tutorial o=
nline...
>
> http://pypi.python.org/pypi/watchdog/0.3.6  (Yes, it is currently on v0.6=
.0 and this is older - v0.3.6)
>
> ... it looks like I COULD do something like...

I haven't actually used watchdog myself. I was just querying how you
were getting updates about file changes (and suggesting to use a PyPI
package since at least one was available for your needs).


Oscar