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# Copyright 2016 gRPC authors.
#
# 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.
"""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 threading
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
self._dispatch_thread = threading.Thread(
target=self._dispatch_requests, args=())
def start(self):
self._is_running = True
self._client.start()
self._dispatch_thread.start()
def stop(self):
self._is_running = False
self._client.stop()
self._dispatch_thread.join()
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, client, response_time):
if self._is_running:
client.send_request()
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