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pythontornado

Is there any way to change callback timeout in tornado PeriodicCallback instance?

I know about:

periodical_cllback_instance.stop() periodical_cllback_instance.start()

but it restarts with current callback_time ... is there any monkey patch to change callback_time after triggering stop() ... or some other ways?

Solution

  • You can just change the callback_time directly, you don't even need to stop the PeriodicCallback instance. This snipped seems to work for me:

    import tornado
from tornado.ioloop import PeriodicCallback

pc = None
counter = 0


def get_periodic_callback():
    global pc
    if pc is None:
        pc = PeriodicCallback(callback, 1000)
    return pc


def callback():
    global counter
    if counter < 5:
        counter += 1
        print("foo")
    else:
        pc = get_periodic_callback()
        pc.callback_time = 100
        print("bar")


pc = get_periodic_callback()
pc.start()
tornado.ioloop.IOLoop.instance().start()