class RulesService(MessagingEnabled, BasePlugin):
def __init__(self, *args, **kwargs):
super().__init__(*args, **kwargs)
self.exited = Event()
def on_service_start(self, *args, **kwargs):
self.notify_start()
self.exited.wait()
def on_service_stop(self, *args, **kwargs):
self.exited.stop()
def after(delay, action, *args):
"""
Execute an action after a given number of seconds.
This function is executed in a separate thread.
Parameters
----------
delay : float
Number of seconds to delay the action.
action
To be taken after the interval.
args : tuple, default is ()
Arguments for the action.
Returns
-------
Event
A timer object that can be terminated using the `stop()` method.
"""
event = Event()
def wait():
if event.wait(delay):
return
action(*args)
Thread(target=wait).start()
event.stop = event.set
return event
def after(delay, action, *args):
"""
Execute an action after a given number of seconds.
This function is executed in a separate thread.
Parameters
----------
delay : float
Number of seconds to delay the action.
action
To be taken after the interval.
args : tuple, default is ()
Arguments for the action.
Returns
-------
Event
A timer object that can be terminated using the `stop()` method.
"""
event = Event()
def wait():
if event.wait(delay):
return
action(*args)
Thread(target=wait).start()
event.stop = event.set
return event
def repeat(interval, action, *args):
"""
Repeat an action forever after a given number of seconds.
If a sequence of events takes longer to run than the time available
before the next event, the repeater will simply fall behind.
This function is executed in a separate thread.
Parameters
----------
interval : float
Number of seconds between executions.
action
To be taken after the interval.
args : tuple, default is ()
Arguments for the action.
Returns
-------
Event
A timer object that can be terminated using the `stop()` method.
"""
event = Event()
def loop():
starttime = time.time()
while True:
nexttime = starttime + interval
action(*args)
after_action = time.time()
if event.wait(nexttime - after_action):
break
starttime = max(after_action, nexttime)
Thread(target=loop).start()
event.stop = event.set
return event
def repeat(interval, action, *args):
"""
Repeat an action forever after a given number of seconds.
If a sequence of events takes longer to run than the time available
before the next event, the repeater will simply fall behind.
This function is executed in a separate thread.
Parameters
----------
interval : float
Number of seconds between executions.
action
To be taken after the interval.
args : tuple, default is ()
Arguments for the action.
Returns
-------
Event
A timer object that can be terminated using the `stop()` method.
"""
event = Event()
def loop():
starttime = time.time()
while True:
nexttime = starttime + interval
action(*args)
after_action = time.time()
if event.wait(nexttime - after_action):
break
starttime = max(after_action, nexttime)
Thread(target=loop).start()
event.stop = event.set
return event
