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-rw-r--r--sleekxmpp/xmlstream/scheduler.py87
1 files changed, 87 insertions, 0 deletions
diff --git a/sleekxmpp/xmlstream/scheduler.py b/sleekxmpp/xmlstream/scheduler.py
new file mode 100644
index 00000000..40aaf695
--- /dev/null
+++ b/sleekxmpp/xmlstream/scheduler.py
@@ -0,0 +1,87 @@
+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.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