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# -*- coding: utf-8 -*-
#
# File: portato/waiting_queue.py
# This file is part of the Portato-Project, a graphical portage-frontend.
#
# Copyright (C) 2007 René 'Necoro' Neumann
# This is free software. You may redistribute copies of it under the terms of
# the GNU General Public License version 2.
# There is NO WARRANTY, to the extent permitted by law.
#
# Written by René 'Necoro' Neumann <necoro@necoro.net>
from threading import Thread, Event
from Queue import Queue
class WaitingQueue (Queue):
def __init__ (self, setTrue = True, threadClass = Thread):
if not issubclass(threadClass, Thread):
raise ValueError, "Only subclasses of threading.Thread are allowed."
Queue.__init__(self)
self.event = Event()
self.counter = 0
self.threadClass = threadClass
if setTrue:
self.event.set() # true at the beginning
waitingThread = self.threadClass(name = "Waiting-Queue-Thread", target = self.runThread)
waitingThread.setDaemon(True)
waitingThread.start()
def put (self, method, *args, **kwargs):
self.counter += 1;
if "caller" in kwargs:
name = "Waiting Thread #%d (called by:%s)" % (self.counter, kwargs["caller"])
del kwargs["caller"]
else:
name = "Waiting Thread #%d" % self.counter
t = self.threadClass(name = name, target = method, args = args, kwargs = kwargs)
t.setDaemon(True)
Queue.put(self, t, False)
def runThread (self):
while True:
self.event.wait()
t = self.get(True)
self.event.clear()
t.run()
def next (self):
self.event.set()
def clear (self):
self.mutex.acquire()
self.queue.clear()
self.mutex.release()
self.event.set()
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