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Diffstat (limited to 'python/qpid/queue.py')
-rw-r--r-- | python/qpid/queue.py | 88 |
1 files changed, 0 insertions, 88 deletions
diff --git a/python/qpid/queue.py b/python/qpid/queue.py deleted file mode 100644 index 63a7684843..0000000000 --- a/python/qpid/queue.py +++ /dev/null @@ -1,88 +0,0 @@ -# -# Licensed to the Apache Software Foundation (ASF) under one -# or more contributor license agreements. See the NOTICE file -# distributed with this work for additional information -# regarding copyright ownership. The ASF licenses this file -# to you under the Apache License, Version 2.0 (the -# "License"); you may not use this file except in compliance -# with the License. You may obtain a copy of the License at -# -# http://www.apache.org/licenses/LICENSE-2.0 -# -# Unless required by applicable law or agreed to in writing, -# software distributed under the License is distributed on an -# "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY -# KIND, either express or implied. See the License for the -# specific language governing permissions and limitations -# under the License. -# - -""" -This module augments the standard python multithreaded Queue -implementation to add a close() method so that threads blocking on the -content of a queue can be notified if the queue is no longer in use. -""" - -from Queue import Queue as BaseQueue, Empty, Full -from threading import Thread -from exceptions import Closed - -class Queue(BaseQueue): - - END = object() - STOP = object() - - def __init__(self, *args, **kwargs): - BaseQueue.__init__(self, *args, **kwargs) - self.error = None - self.listener = None - self.exc_listener = None - self.thread = None - - def close(self, error = None): - self.error = error - self.put(Queue.END) - if self.thread is not None: - self.thread.join() - self.thread = None - - def get(self, block = True, timeout = None): - result = BaseQueue.get(self, block, timeout) - if result == Queue.END: - # this guarantees that any other waiting threads or any future - # calls to get will also result in a Closed exception - self.put(Queue.END) - raise Closed(self.error) - else: - return result - - def listen(self, listener, exc_listener = None): - if listener is None and exc_listener is not None: - raise ValueError("cannot set exception listener without setting listener") - - if listener is None: - if self.thread is not None: - self.put(Queue.STOP) - # loop and timed join permit keyboard interrupts to work - while self.thread.isAlive(): - self.thread.join(3) - self.thread = None - - self.listener = listener - self.exc_listener = exc_listener - - if listener is not None and self.thread is None: - self.thread = Thread(target = self.run) - self.thread.setDaemon(True) - self.thread.start() - - def run(self): - while True: - try: - o = self.get() - if o == Queue.STOP: break - self.listener(o) - except Closed, e: - if self.exc_listener is not None: - self.exc_listener(e) - break |