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One time listener ensures it is executed one time

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This commit is contained in:
Paulus Schoutsen 2014-02-14 12:58:28 -08:00
parent 4ab362531f
commit 0e97e64397
1 changed files with 13 additions and 8 deletions
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21
homeassistant/__init__.py
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@ -327,16 +327,21 @@ class Bus(object):
as event_type. as event_type.
Note: at the moment it is impossible to remove a one time listener. Note: at the moment it is impossible to remove a one time listener.
Note2: it is also not guaranteed that it will only run once
""" """
@ft.wraps(listener)
def onetime_listener(event): def onetime_listener(event):
""" Removes listener from eventbus and then fires listener. """ """ Removes listener from eventbus and then fires listener. """
self.remove_event_listener(event_type, onetime_listener) if not hasattr(onetime_listener, 'run'):
# Set variable so that we will never run twice.
# Because the event bus might have to wait till a thread comes
# available to execute this listener it might occur that the
# listener gets lined up twice to be executed.
# This will make sure the second time it does nothing.
onetime_listener.run = True
listener(event) self.remove_event_listener(event_type, onetime_listener)
onetime_listener.__name__ = "One time listener for {}".format( listener(event)
listener.__name__)
self.listen_event(event_type, onetime_listener) self.listen_event(event_type, onetime_listener)
@ -363,16 +368,16 @@ class Bus(object):
self.last_busy_notice = dt.datetime.now() self.last_busy_notice = dt.datetime.now()
logger = self.logger log_error = self.logger.error
logger.error( log_error(
"Bus:All {} threads are busy and {} jobs pending".format( "Bus:All {} threads are busy and {} jobs pending".format(
self.thread_count, self.pool.queue.qsize())) self.thread_count, self.pool.queue.qsize()))
jobs = self.pool.current_jobs jobs = self.pool.current_jobs
for start, job in jobs: for start, job in jobs:
logger.error("Bus:Current job from {}: {}".format( log_error("Bus:Current job from {}: {}".format(
util.datetime_to_str(start), job)) util.datetime_to_str(start), job))