[Twisted-Python] LoopingCall question

[Mike Preshman]

I got it to work with classes.

from twisted.internet import utils, reactor, defer, task
import twisted
import time, sys

class Looping:

    def __init__(self, c, t):
        self.c = c
        self.t = t
        self.count = 0

    def myPoll(self, *args):
        print "poll", args

        self.count = self.count + 1

        if self.count > 3:
            self.task.stop()

    def start(self):
        self.task = task.LoopingCall(self.myPoll, self.c)
        return self.task.start(self.t)


c1 = Looping("A", 1)
d1 = c1.start()

c2 = Looping("B", 2)
d2 = c2.start()

c3 = Looping("C", 3)
d3 = c3.start()


dL = defer.gatherResults([d1, d2, d3])
dL.addCallback(lambda _: reactor.stop())

reactor.run()


On Fri, Jun 27, 2008 at 9:44 AM, Itamar Shtull-Trauring <itamar at itamarst.org>
wrote:

> On Wed, 2008-06-25 at 23:29 -0400, Mike Preshman wrote:
> > Hello,
> >
> > I am trying to run three deferred LoopingCall chains in parallel.
> > Here is my code below. I am trying to figure out what is the correct
> > way of exiting the polling after I meet some
> > condition that the polling satisfies.
>
> You needn't use LoopingCall, if it's unsuitable - assuming Twisted 8.1:
>
>
> from twisted.internet import defer, reactor, task
>
> class _LoopUntil(object):
>
>    def __init__(self, delay, check):
>        self.delay = delay
>        self.check = check
>        self.result = defer.Deferred()
>
>    def go(self):
>        task.deferLater(reactor, self.delay, check).addCallbacks(
>            self._gotResult, self._failed)
>
>    def _gotResult(self, r):
>         if r:
>             d = self.result
>             del self.result
>             self.result.callback(r)
>         else:
>             self.go()
>
>    def _failed(self, f):
>        self.result.errback(f)
>        del self.result
>
>
> def loopUntil(delay, check):
>    l = _LoopUntil(delay, check)
>    r = l.result
>    l.go()
>    return r
>
>
>
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