207 lines
7.1 KiB
Python
207 lines
7.1 KiB
Python
"""
|
|
SleekXMPP: The Sleek XMPP Library
|
|
Copyright (C) 2010 Nathanael C. Fritz
|
|
This file is part of SleekXMPP.
|
|
|
|
See the file LICENSE for copying permission.
|
|
"""
|
|
|
|
import time
|
|
import threading
|
|
import logging
|
|
try:
|
|
import queue
|
|
except ImportError:
|
|
import Queue as queue
|
|
|
|
|
|
log = logging.getLogger(__name__)
|
|
|
|
|
|
class Task(object):
|
|
|
|
"""
|
|
A scheduled task that will be executed by the scheduler
|
|
after a given time interval has passed.
|
|
|
|
Attributes:
|
|
name -- The name of the task.
|
|
seconds -- The number of seconds to wait before executing.
|
|
callback -- The function to execute.
|
|
args -- The arguments to pass to the callback.
|
|
kwargs -- The keyword arguments to pass to the callback.
|
|
repeat -- Indicates if the task should repeat.
|
|
Defaults to False.
|
|
qpointer -- A pointer to an event queue for queuing callback
|
|
execution instead of executing immediately.
|
|
|
|
Methods:
|
|
run -- Either queue or execute the callback.
|
|
reset -- Reset the task's timer.
|
|
"""
|
|
|
|
def __init__(self, name, seconds, callback, args=None,
|
|
kwargs=None, repeat=False, qpointer=None):
|
|
"""
|
|
Create a new task.
|
|
|
|
Arguments:
|
|
name -- The name of the task.
|
|
seconds -- The number of seconds to wait before executing.
|
|
callback -- The function to execute.
|
|
args -- The arguments to pass to the callback.
|
|
kwargs -- The keyword arguments to pass to the callback.
|
|
repeat -- Indicates if the task should repeat.
|
|
Defaults to False.
|
|
qpointer -- A pointer to an event queue for queuing callback
|
|
execution instead of executing immediately.
|
|
"""
|
|
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):
|
|
"""
|
|
Execute the task's callback.
|
|
|
|
If an event queue was supplied, place the callback in the queue;
|
|
otherwise, execute the callback immediately.
|
|
"""
|
|
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):
|
|
"""
|
|
Reset the task's timer so that it will repeat.
|
|
"""
|
|
self.next = time.time() + self.seconds
|
|
|
|
|
|
class Scheduler(object):
|
|
|
|
"""
|
|
A threaded scheduler that allows for updates mid-execution unlike the
|
|
scheduler in the standard library.
|
|
|
|
http://docs.python.org/library/sched.html#module-sched
|
|
|
|
Attributes:
|
|
addq -- A queue storing added tasks.
|
|
schedule -- A list of tasks in order of execution times.
|
|
thread -- If threaded, the thread processing the schedule.
|
|
run -- Indicates if the scheduler is running.
|
|
parentqueue -- A parent event queue in control of this scheduler.
|
|
|
|
Methods:
|
|
add -- Add a new task to the schedule.
|
|
process -- Process and schedule tasks.
|
|
quit -- Stop the scheduler.
|
|
"""
|
|
|
|
def __init__(self, parentqueue=None, parentstop=None):
|
|
"""
|
|
Create a new scheduler.
|
|
|
|
Arguments:
|
|
parentqueue -- A separate event queue controlling this scheduler.
|
|
"""
|
|
self.addq = queue.Queue()
|
|
self.schedule = []
|
|
self.thread = None
|
|
self.run = False
|
|
self.parentqueue = parentqueue
|
|
self.parentstop = parentstop
|
|
|
|
def process(self, threaded=True):
|
|
"""
|
|
Begin accepting and processing scheduled tasks.
|
|
|
|
Arguments:
|
|
threaded -- Indicates if the scheduler should execute in its own
|
|
thread. Defaults to True.
|
|
"""
|
|
if threaded:
|
|
self.thread = threading.Thread(name='sheduler_process',
|
|
target=self._process)
|
|
self.thread.start()
|
|
else:
|
|
self._process()
|
|
|
|
def _process(self):
|
|
"""Process scheduled tasks."""
|
|
self.run = True
|
|
try:
|
|
while self.run and (self.parentstop is None or not self.parentstop.isSet()):
|
|
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:
|
|
if wait >= 3.0:
|
|
wait = 3.0
|
|
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
|
|
if self.parentstop is not None:
|
|
log.debug("stopping parent")
|
|
self.parentstop.set()
|
|
except SystemExit:
|
|
self.run = False
|
|
if self.parentstop is not None:
|
|
self.parentstop.set()
|
|
log.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):
|
|
"""
|
|
Schedule a new task.
|
|
|
|
Arguments:
|
|
name -- The name of the task.
|
|
seconds -- The number of seconds to wait before executing.
|
|
callback -- The function to execute.
|
|
args -- The arguments to pass to the callback.
|
|
kwargs -- The keyword arguments to pass to the callback.
|
|
repeat -- Indicates if the task should repeat.
|
|
Defaults to False.
|
|
qpointer -- A pointer to an event queue for queuing callback
|
|
execution instead of executing immediately.
|
|
"""
|
|
self.addq.put(Task(name, seconds, callback, args,
|
|
kwargs, repeat, qpointer))
|
|
|
|
def quit(self):
|
|
"""Shutdown the scheduler."""
|
|
self.run = False
|