91 lines
2.4 KiB
Python
91 lines
2.4 KiB
Python
#!/usr/bin/env python
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# Copyright (C) 2011-2013 OpenStack Foundation
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# 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
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# implied.
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#
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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 sys
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import threading
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import Queue
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import logging
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import time
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class Task(object):
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def __init__(self, **kw):
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self._wait_event = threading.Event()
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self._exception = None
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self._traceback = None
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self._result = None
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self.args = kw
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def done(self, result):
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self._result = result
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self._wait_event.set()
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def exception(self, e, tb):
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self._exception = e
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self._traceback = tb
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self._wait_event.set()
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def wait(self):
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self._wait_event.wait()
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if self._exception:
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raise self._exception, None, self._traceback
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return self._result
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def run(self, client):
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try:
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self.done(self.main(client))
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except Exception as e:
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self.exception(e, sys.exc_info()[2])
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class TaskManager(threading.Thread):
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log = logging.getLogger("nodepool.ProviderManager")
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def __init__(self, client, name, rate):
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super(TaskManager, self).__init__()
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self.daemon = True
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self.queue = Queue.Queue()
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self._running = True
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self.name = name
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self.rate = float(rate)
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self._client = None
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def stop(self):
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self._running = False
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self.queue.put(None)
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def run(self):
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last_ts = 0
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while self._running:
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task = self.queue.get()
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if not task:
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continue
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while True:
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delta = time.time() - last_ts
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if delta >= self.rate:
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break
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time.sleep(self.rate - delta)
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self.log.debug("Manager %s running task %s" % (self.name, task))
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task.run(self._client)
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last_ts = time.time()
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self.queue.task_done()
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def submitTask(self, task):
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self.queue.put(task)
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return task.wait()
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