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# Licensed to the StackStorm, Inc ('StackStorm') under one or more |
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# contributor license agreements. See the NOTICE file distributed with |
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# this work for additional information regarding copyright ownership. |
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# The ASF licenses this file to You under the Apache License, Version 2.0 |
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# (the "License"); you may not use this file except in compliance with |
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# the License. You may obtain a copy of the License at |
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# |
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# http://www.apache.org/licenses/LICENSE-2.0 |
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# |
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# Unless required by applicable law or agreed to in writing, software |
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# distributed under the License is distributed on an "AS IS" BASIS, |
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
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# See the License for the specific language governing permissions and |
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# limitations under the License. |
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import time |
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import eventlet |
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import Queue |
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from st2common import log as logging |
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__all__ = [ |
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'BufferedDispatcher' |
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] |
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# If the thread pool has been occupied with no empty threads for more than this number of seconds |
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# a message will be logged |
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POOL_BUSY_THRESHOLD_SECONDS = 60 |
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POOL_BUSY_LOG_MESSAGE = """ |
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BufferedDispatcher pool "%s" has been busy with no free threads for more than %s seconds. If there \ |
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are server resources available, consider increasing the dispatcher pool size in the config. |
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""".strip() |
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LOG = logging.getLogger(__name__) |
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class BufferedDispatcher(object): |
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def __init__(self, dispatch_pool_size=50, monitor_thread_empty_q_sleep_time=5, |
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monitor_thread_no_workers_sleep_time=1, name=None): |
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self._pool_limit = dispatch_pool_size |
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self._dispatcher_pool = eventlet.GreenPool(dispatch_pool_size) |
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self._dispatch_monitor_thread = eventlet.greenthread.spawn(self._flush) |
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self._monitor_thread_empty_q_sleep_time = monitor_thread_empty_q_sleep_time |
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self._monitor_thread_no_workers_sleep_time = monitor_thread_no_workers_sleep_time |
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self._name = name |
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self._work_buffer = Queue.Queue() |
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# Internal attributes we use to track how long the pool is busy without any free workers |
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self._pool_last_free_ts = time.time() |
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@property |
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def name(self): |
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return self._name or id(self) |
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def dispatch(self, handler, *args): |
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self._work_buffer.put((handler, args), block=True, timeout=1) |
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self._flush_now() |
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def shutdown(self): |
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self._dispatch_monitor_thread.kill() |
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def _flush(self): |
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while True: |
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while self._work_buffer.empty(): |
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eventlet.greenthread.sleep(self._monitor_thread_empty_q_sleep_time) |
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while self._dispatcher_pool.free() <= 0: |
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eventlet.greenthread.sleep(self._monitor_thread_no_workers_sleep_time) |
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self._flush_now() |
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def _flush_now(self): |
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if self._dispatcher_pool.free() <= 0: |
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now = time.time() |
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if (now - self._pool_last_free_ts) >= POOL_BUSY_THRESHOLD_SECONDS: |
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LOG.info(POOL_BUSY_LOG_MESSAGE % (self.name, POOL_BUSY_THRESHOLD_SECONDS)) |
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return |
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# Update the time of when there were free threads available |
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self._pool_last_free_ts = time.time() |
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while not self._work_buffer.empty() and self._dispatcher_pool.free() > 0: |
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(handler, args) = self._work_buffer.get_nowait() |
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self._dispatcher_pool.spawn(handler, *args) |
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def __repr__(self): |
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free_count = self._dispatcher_pool.free() |
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values = (self.name, self._pool_limit, free_count, self._monitor_thread_empty_q_sleep_time, |
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self._monitor_thread_no_workers_sleep_time) |
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return ('<BufferedDispatcher name=%s,dispatch_pool_size=%s,free_threads=%s,' |
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'monitor_thread_empty_q_sleep_time=%s,monitor_thread_no_workers_sleep_time=%s>' % |
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values) |
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StackStorm /
st2
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