| # Copyright 2016, Google Inc. |
| # All rights reserved. |
| # |
| # Redistribution and use in source and binary forms, with or without |
| # modification, are permitted provided that the following conditions are |
| # met: |
| # |
| # * Redistributions of source code must retain the above copyright |
| # notice, this list of conditions and the following disclaimer. |
| # * Redistributions in binary form must reproduce the above |
| # copyright notice, this list of conditions and the following disclaimer |
| # in the documentation and/or other materials provided with the |
| # distribution. |
| # * Neither the name of Google Inc. nor the names of its |
| # contributors may be used to endorse or promote products derived from |
| # this software without specific prior written permission. |
| # |
| # THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS |
| # "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT |
| # LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR |
| # A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT |
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| # (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE |
| # OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| |
| """Defines behavior for WHEN clients send requests. |
| |
| Each client exposes a non-blocking send_request() method that the |
| ClientRunner invokes either periodically or in response to some event. |
| """ |
| |
| import abc |
| import thread |
| import time |
| |
| |
| class ClientRunner: |
| """Abstract interface for sending requests from clients.""" |
| |
| __metaclass__ = abc.ABCMeta |
| |
| def __init__(self, client): |
| self._client = client |
| |
| @abc.abstractmethod |
| def start(self): |
| raise NotImplementedError() |
| |
| @abc.abstractmethod |
| def stop(self): |
| raise NotImplementedError() |
| |
| |
| class OpenLoopClientRunner(ClientRunner): |
| |
| def __init__(self, client, interval_generator): |
| super(OpenLoopClientRunner, self).__init__(client) |
| self._is_running = False |
| self._interval_generator = interval_generator |
| |
| def start(self): |
| self._is_running = True |
| self._client.start() |
| thread.start_new_thread(self._dispatch_requests, ()) |
| |
| def stop(self): |
| self._is_running = False |
| self._client.stop() |
| self._client = None |
| |
| def _dispatch_requests(self): |
| while self._is_running: |
| self._client.send_request() |
| time.sleep(next(self._interval_generator)) |
| |
| |
| class ClosedLoopClientRunner(ClientRunner): |
| |
| def __init__(self, client, request_count): |
| super(ClosedLoopClientRunner, self).__init__(client) |
| self._is_running = False |
| self._request_count = request_count |
| # Send a new request on each response for closed loop |
| self._client.add_response_callback(self._send_request) |
| |
| def start(self): |
| self._is_running = True |
| self._client.start() |
| for _ in xrange(self._request_count): |
| self._client.send_request() |
| |
| def stop(self): |
| self._is_running = False |
| self._client.stop() |
| self._client = None |
| |
| def _send_request(self, response_time): |
| if self._is_running: |
| self._client.send_request() |
| |