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try:
import queue
except ImportError:
import Queue as queue
import time
import threading
import logging
class Task(object):
"""Task object for the Scheduler class"""
def __init__(self, name, seconds, callback, args=None, kwargs=None, repeat=False, qpointer=None):
self.name = name
self.seconds = seconds
self.callback = callback
self.args = args or tuple()
self.kwargs = kwargs or {}
self.repeat = repeat
self.next = time.time() + self.seconds
self.qpointer = qpointer
def run(self):
if self.qpointer is not None:
self.qpointer.put(('schedule', self.callback, self.args))
else:
self.callback(*self.args, **self.kwargs)
self.reset()
return self.repeat
def reset(self):
self.next = time.time() + self.seconds
class Scheduler(object):
"""Threaded scheduler that allows for updates mid-execution unlike http://docs.python.org/library/sched.html#module-sched"""
def __init__(self, parentqueue=None):
self.addq = queue.Queue()
self.schedule = []
self.thread = None
self.run = False
self.parentqueue = parentqueue
def process(self, threaded=True):
if threaded:
self.thread = threading.Thread(name='shedulerprocess', target=self._process)
self.thread.daemon = True
self.thread.start()
else:
self._process()
def _process(self):
self.run = True
while self.run:
try:
wait = 1
updated = False
if self.schedule:
wait = self.schedule[0].next - time.time()
try:
if wait <= 0.0:
newtask = self.addq.get(False)
else:
newtask = self.addq.get(True, wait)
except queue.Empty:
cleanup = []
for task in self.schedule:
if time.time() >= task.next:
updated = True
if not task.run():
cleanup.append(task)
else:
break
for task in cleanup:
x = self.schedule.pop(self.schedule.index(task))
else:
updated = True
self.schedule.append(newtask)
finally:
if updated: self.schedule = sorted(self.schedule, key=lambda task: task.next)
except KeyboardInterrupt:
self.run = False
logging.debug("Quitting Scheduler thread")
if self.parentqueue is not None:
self.parentqueue.put(('quit', None, None))
def add(self, name, seconds, callback, args=None, kwargs=None, repeat=False, qpointer=None):
self.addq.put(Task(name, seconds, callback, args, kwargs, repeat, qpointer))
def quit(self):
self.run = False
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