def __init__(self):
"""
Creates new EventReactor with standard SynchronizedQueue and __QueueOperator
"""
self.__event_queue = SynchronizedQueue()
self.__enqueuer = __QueueOperator(self.__event_queue)
self.__rshift__ = self.__enqueuer.__rshift__
self.__lshift__ = self.__enqueuer.__lshift__
self.__last_access_time = sys.current_time()
class EventReactor(object):
"""
EventReactor is base class for all EventReactors.
Provides a way to queue new events and then EventReactor deals with
the events
"""
def __init__(self):
"""
Creates new EventReactor with standard SynchronizedQueue and __QueueOperator
"""
self.__event_queue = SynchronizedQueue()
self.__enqueuer = __QueueOperator(self.__event_queue)
self.__rshift__ = self.__enqueuer.__rshift__
self.__lshift__ = self.__enqueuer.__lshift__
self.__last_access_time = sys.current_time()
def poll(self):
"""
When called, one pending event will be resolved.
Returns True if at least one event was resolved or False if queue is empty
"""
dif = sys.current_time() - self.__last_access_time
self.__last_access_time = sys.current_time()
with self.__event_queue.mutex:
if self.__event_queue.has_elements():
event = self.__event_queue.poll()
event.currentPTime -= dif
if event.currentPTime <= 0:
event.currentPTime = event.periodTime
self.fire_event(event)
if event.periodic:
self.__enqueuer.enqueue(event)
return True
else:
self.__event_queue.add(event)
return False
def has_events(self):
"""
Returns True if this reactor has events enqueued.
This might not be accurate value due to threading issues
"""
with self.__event_queue.mutex:
return len(self.__event_queue)
def fire_event(self, event):
"""
Base method, calls .call() on event. Is called when event needs to be fired by poll method
"""
event.call()