| #!/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() |
