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#!/usr/bin/env python
# Copyright 2010 Google Inc. All Rights Reserved.
#
# Licensed 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.
import threading
class DaemonServer(object):
"""Base class which manages creation and cleanup of daemon style servers."""
def __enter__(self):
# TODO: Because of python's Global Interpreter Lock (GIL), the threads
# will run on the same CPU. Consider using processes instead because
# the components do not need to communicate with each other. On Linux,
# "taskset" could be used to assign each process to specific CPU/core.
# Of course, only bother with this if the processing speed is an issue.
# Some related discussion: http://stackoverflow.com/questions/990102/python-global-interpreter-lock-gil-workaround-on-multi-core-systems-using-tasks
thread = threading.Thread(target=self.serve_forever)
thread.daemon = True # Python exits when no non-daemon threads are left.
thread.start()
return self
def __exit__(self, unused_exc_type, unused_exc_val, unused_exc_tb):
self.cleanup()
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