1 # Copyright (c) 2010 Google Inc. All rights reserved.
3 # Redistribution and use in source and binary forms, with or without
4 # modification, are permitted provided that the following conditions are
7 # * Redistributions of source code must retain the above copyright
8 # notice, this list of conditions and the following disclaimer.
9 # * Redistributions in binary form must reproduce the above
10 # copyright notice, this list of conditions and the following disclaimer
11 # in the documentation and/or other materials provided with the
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14 # contributors may be used to endorse or promote products derived from
15 # this software without specific prior written permission.
17 # THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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30 class MessagePumpDelegate(object):
31 def schedule(self, interval, callback):
32 raise NotImplementedError, "subclasses must implement"
34 def message_available(self, message):
35 raise NotImplementedError, "subclasses must implement"
37 def final_message_delivered(self):
38 raise NotImplementedError, "subclasses must implement"
41 class MessagePump(object):
42 interval = 10 # seconds
44 def __init__(self, delegate, message_queue):
45 self._delegate = delegate
46 self._message_queue = message_queue
50 self._delegate.schedule(self.interval, self._callback)
53 (messages, is_running) = self._message_queue.take_all()
54 for message in messages:
55 self._delegate.message_available(message)
57 self._delegate.final_message_delivered()