RE: Pausing POE::Wheel::FollowTail?

Hi Larry-

Thanks for the response! Either of your solutions could be best, but I'm
not sure about a couple of things:

1.) Say I save the current state then destroy the wheel. When I start up
a new wheel, how do I know whether to use the saved data to index back
to where I left off or (if the file has been reset) to just start from
the beginning?

2.) If I change PollInterval, what value would I change it to, so that
it would never fire?

Thanks

-Craig

-----Original Message-----
From: Larry Clapp [mailto:[email protected]] 
Sent: Monday, October 06, 2008 11:14 AM
To: Votava, Craig M (Craig)
Cc: [email protected]
Subject: Re: Pausing POE::Wheel::FollowTail?

On Mon, Oct 06, 2008 at 10:11:42AM -0500, Votava, Craig M (Craig) wrote:
> I wrote a simple perl application that uses POE::Wheel::FollowTail
> to get entries out of a logfile, and puts them up in a Tk Text
> window.
> 
> I want to add a pause/resume toggle button at the bottom of the Text
> window, so that the user can stop and start the incoming data
> whenever they want. When the input is paused, I would like to have
> minimal impact on the CPU. If the pause lasts long enough to where
> the file is reset, then the user would get the data starting at the
> beginning of the current file once they unpause. What is the best
> way to do this?
> 
> I wonder if it would make sense to add a pause method to this
> module? If the general consensus is yes, I can volunteer to take a
> stab at it. If there is a better/easier/faster way to do it with the
> existing methods, please let me know.

I am new to POE, but it seems to me you could either

  - use tell() to get the current position
  - destroy the wheel
  - recreate it when you're ready and set the Seek to the previous
    position

  (There's actually an example of this in the POE::Wheel::FollowTail
  manpage under tell().)

or

  - Alter (or subclass) FollowTail so that you can change the
    PollInterval dynamically.

Neither would be very hard.

-- Larry


p.s.  Hi, POE list!