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Idle thread (Polling) python GUI and saving program state

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  Idle thread (Polling) python GUI and saving program state Rolando <abhishek1899@gmail.com> - 2014-03-03 17:33 -0800
    Re: Idle thread (Polling) python GUI and saving program state MRAB <python@mrabarnett.plus.com> - 2014-03-04 02:06 +0000
      Re: Idle thread (Polling) python GUI and saving program state Rolando <abhishek1899@gmail.com> - 2014-03-03 18:41 -0800
        Re: Idle thread (Polling) python GUI and saving program state MRAB <python@mrabarnett.plus.com> - 2014-03-04 13:19 +0000

#67621 — Idle thread (Polling) python GUI and saving program state

I have a GUI with a bunch of cells which is my "View" in the MVC design. The user enters some information in the view and I pass this on to the model so that using the information entered by the user it(model) can do some processing.

I have coded up my model as a state machine. Wherein, once a function is complete it switches to the next state and so on.

I want to know how do I save the program state between restarts. Basically, I'm trying to handle a scenario wherein if someone closes the program. The next time someone starts it up, it should start from where it left off (both the view and model)

Also, I want to setup a poll method where once in a while I can poll each cell to know the state it is in. How do I do this? I don't want my GUI to hang when I'm doing anything. It will be great if someone could help. Thanks!

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#67625

On 2014-03-04 01:33, Rolando wrote:
 > I have a GUI with a bunch of cells which is my "View" in the MVC
 > design. The user enters some information in the view and I pass this
 > on to the model so that using the information entered by the user
 > it(model) can do some processing.
 >
 > I have coded up my model as a state machine. Wherein, once a function
 > is complete it switches to the next state and so on.
 >
 > I want to know how do I save the program state between restarts.
 > Basically, I'm trying to handle a scenario wherein if someone closes
 > the program. The next time someone starts it up, it should start from
 > where it left off (both the view and model)
 >
When the user closes the window (you don't say what you're using for
the GUI, but there should be a way of detecting when window closes),
save the necessary info to a file using, say, the 'json' module. You
can then reload the info from the file when the program is restarted.

 > Also, I want to setup a poll method where once in a while I can poll
 > each cell to know the state it is in. How do I do this? I don't want
 > my GUI to hang when I'm doing anything. It will be great if someone
 > could help. Thanks!
 >
Can the model run continuously? If so, you should run it in its own
(background) thread and the GUI in the main thread and communicate
with the model's thread via, say, a queue (for that use the 'queue'
module).

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#67628

On Monday, March 3, 2014 6:06:22 PM UTC-8, MRAB wrote:
> On 2014-03-04 01:33, Rolando wrote:
> 
>  > I have a GUI with a bunch of cells which is my "View" in the MVC
> 
>  > design. The user enters some information in the view and I pass this
> 
>  > on to the model so that using the information entered by the user
> 
>  > it(model) can do some processing.
> 
>  >
> 
>  > I have coded up my model as a state machine. Wherein, once a function
> 
>  > is complete it switches to the next state and so on.
> 
>  >
> 
>  > I want to know how do I save the program state between restarts.
> 
>  > Basically, I'm trying to handle a scenario wherein if someone closes
> 
>  > the program. The next time someone starts it up, it should start from
> 
>  > where it left off (both the view and model)
> 
>  >
> 
> When the user closes the window (you don't say what you're using for
> 
> the GUI, but there should be a way of detecting when window closes),
> 
> save the necessary info to a file using, say, the 'json' module. You
> 
> can then reload the info from the file when the program is restarted.
> 
> 
> 
>  > Also, I want to setup a poll method where once in a while I can poll
> 
>  > each cell to know the state it is in. How do I do this? I don't want
> 
>  > my GUI to hang when I'm doing anything. It will be great if someone
> 
>  > could help. Thanks!
> 
>  >
> 
> Can the model run continuously? If so, you should run it in its own
> 
> (background) thread and the GUI in the main thread and communicate
> 
> with the model's thread via, say, a queue (for that use the 'queue'
> 
> module).

I'm using wxPython for my GUI. I have tried running the model thread in the background. But how will I save the state if the whole model is running on a thread? When the program is restarted I want the program to continue from the same state where it left off for each cell. I was thinking of having an idle thread that calls a poll method which polls all the cells and checks what each one is doing. But, I don't know how to do that. I'm confused.

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#67673

On 2014-03-04 02:41, Rolando wrote:> On Monday, March 3, 2014 6:06:22 PM 
UTC-8, MRAB wrote:
 >> On 2014-03-04 01:33, Rolando wrote:
 >>  > I have a GUI with a bunch of cells which is my "View" in the MVC
 >>  > design. The user enters some information in the view and I pass
 >>  > this on to the model so that using the information entered by
 >>  > the user it(model) can do some processing.
 >>  >
 >>  > I have coded up my model as a state machine. Wherein, once a
 >>  > function is complete it switches to the next state and so on.
 >>  >
 >>  > I want to know how do I save the program state between restarts.
 >>  > Basically, I'm trying to handle a scenario wherein if someone
 >>  > closes the program. The next time someone starts it up, it
 >>  > should start from where it left off (both the view and model)
 >>  >
 >> When the user closes the window (you don't say what you're using for
 >> the GUI, but there should be a way of detecting when window closes),
 >> save the necessary info to a file using, say, the 'json' module. You
 >> can then reload the info from the file when the program is
 >< restarted.
 >>
 >>  > Also, I want to setup a poll method where once in a while I can
 >>  > poll each cell to know the state it is in. How do I do this? I
 >>  > don't want my GUI to hang when I'm doing anything. It will be
 >>  > great if someone could help. Thanks!
 >>  >
 >> Can the model run continuously? If so, you should run it in its own
 >> (background) thread and the GUI in the main thread and communicate
 >> with the model's thread via, say, a queue (for that use the 'queue'
 >> module).
 >
 > I'm using wxPython for my GUI. I have tried running the model thread 
in the background. But how will I save the state if the whole model is 
running on a thread? When the program is restarted I want the program to 
continue from the same state where it left off for each cell. I was 
thinking of having an idle thread that calls a poll method which polls 
all the cells and checks what each one is doing. But, I don't know how 
to do that. I'm confused.
 >
Please read this:

https://wiki.python.org/moin/GoogleGroupsPython

because Gmail is formatting your email badly, making it harder to read.


When the front-end wants to quit, it tells the back-end and then waits
for it to terminate before itself quitting.

When the back-end receives the message that it should quit, it saves
its state and terminates.

When the front-end starts up again, it starts the back-end.

When the back-end starts, it load the state and runs.

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