59 lines
1.8 KiB
Python
59 lines
1.8 KiB
Python
# Copyright 2016 Hewlett-Packard Development Company, L.P.
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#
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# Licensed under the Apache License, Version 2.0 (the "License"); you may
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# not use this file except in compliance with the License. You may obtain
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# 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, WITHOUT
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# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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# License for the specific language governing permissions and limitations
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# under the License.
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from dogpile.cache.backends import memcached
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from dogpile.cache import proxy
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from dogpile import util
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from dogpile.util import compat
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from pymemcache.client import base
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class MemcachedLockedDBMProxy(proxy.ProxyBackend):
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def __init__(self, url, port=11211, lock_timeout=0):
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super(MemcachedLockedDBMProxy, self).__init__()
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self.lock_timeout = lock_timeout
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self.url = url
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self.port = port
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@util.memoized_property
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def _clients(self):
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backend = self
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class ClientPool(compat.threading.local):
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def __init__(self):
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self.memcached = backend._create_client()
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return ClientPool()
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@property
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def client(self):
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"""Return the memcached client.
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This uses a threading.local by
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default as it appears most modern
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memcached libs aren't inherently
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threadsafe.
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"""
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return self._clients.memcached
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def _create_client(self):
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return base.Client((self.url, self.port))
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def get_mutex(self, key):
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return memcached.MemcachedLock(lambda: self.client, key,
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timeout=self.lock_timeout)
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