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# *****************************************************************************
# * Copyright (c) 2011, 2013 Wind River Systems, Inc. and others.
# * All rights reserved. This program and the accompanying materials
# * are made available under the terms of the Eclipse Public License v1.0
# * which accompanies this distribution, and is available at
# * http://www.eclipse.org/legal/epl-v10.html
# *
# * Contributors:
# * Wind River Systems - initial API and implementation
# *****************************************************************************
import threading
class EventQueue(object):
def __init__(self, on_shutdown=None):
self.__thread = threading.Thread(target=self,
name="TCF Event Dispatcher")
self.__thread.daemon = True
self.__is_waiting = False
self.__is_shutdown = False
self.__on_shutdown = on_shutdown
self.__lock = threading.Condition()
self.__queue = []
def start(self):
self.__thread.start()
def shutdown(self):
try:
if self.__on_shutdown:
self.__on_shutdown()
with self.__lock:
self.__is_shutdown = True
if self.__is_waiting:
self.__is_waiting = False
self.__lock.notifyAll()
self.__thread.join()
except Exception as e:
from . import protocol
protocol.log("Failed to shutdown TCF event dispatch thread", e)
def isShutdown(self):
with self.__lock:
return self.__is_shutdown
def __error(self, x):
from . import protocol
protocol.log("Unhandled exception in TCF event dispatch", x)
def __call__(self):
while True:
try:
with self.__lock:
while not self.__queue:
if self.__is_shutdown:
return
self.__is_waiting = True
self.__lock.wait()
r, args, kwargs = self.__queue.pop(0)
r(*args, **kwargs)
except Exception as x:
self.__error(x)
def invokeLater(self, r, *args, **kwargs):
assert r
with self.__lock:
if self.__is_shutdown:
raise RuntimeError("TCF event dispatcher has shut down")
self.__queue.append((r, args, kwargs))
if self.__is_waiting:
self.__is_waiting = False
self.__lock.notifyAll()
def isDispatchThread(self):
return threading.currentThread() is self.__thread
def getCongestion(self):
with self.__lock:
job_cnt = 0
l0 = job_cnt / 10 - 100
l1 = len(self.__queue) / 10 - 100
if l1 > l0:
l0 = l1
if l0 > 100:
l0 = 100
return l0
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