45ef595fde
Instead of using the expiring cache type as a means to store worker information just avoid using that type since we don't support expiry in the first place on worker information and use a worker container and a worker object that we can later extend as needed. Also add on clear methods to the cache type that will be used when the WBE executor stop occurs. This ensures we clear out the worker information and any unfinished requests. Change-Id: I6a520376eff1e8a6edcef0a59f2d8b9c0eb15752
86 lines
2.9 KiB
Python
86 lines
2.9 KiB
Python
# -*- coding: utf-8 -*-
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# Copyright (C) 2014 Yahoo! Inc. All Rights Reserved.
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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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import threading
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from oslo_utils import reflection
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import six
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class ExpiringCache(object):
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"""Represents a thread-safe time-based expiring cache.
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NOTE(harlowja): the values in this cache must have a expired attribute that
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can be used to determine if the key and associated value has expired or if
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it has not.
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"""
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def __init__(self):
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self._data = {}
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self._lock = threading.Lock()
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def __setitem__(self, key, value):
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"""Set a value in the cache."""
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with self._lock:
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self._data[key] = value
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def __len__(self):
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"""Returns how many items are in this cache."""
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return len(self._data)
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def get(self, key, default=None):
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"""Retrieve a value from the cache (returns default if not found)."""
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return self._data.get(key, default)
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def __getitem__(self, key):
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"""Retrieve a value from the cache."""
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return self._data[key]
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def __delitem__(self, key):
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"""Delete a key & value from the cache."""
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with self._lock:
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del self._data[key]
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def clear(self, on_cleared_callback=None):
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"""Removes all keys & values from the cache."""
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cleared_items = []
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with self._lock:
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if on_cleared_callback is not None:
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cleared_items.extend(six.iteritems(self._data))
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self._data.clear()
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if on_cleared_callback is not None:
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arg_c = len(reflection.get_callable_args(on_cleared_callback))
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for (k, v) in cleared_items:
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if arg_c == 2:
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on_cleared_callback(k, v)
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else:
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on_cleared_callback(v)
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def cleanup(self, on_expired_callback=None):
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"""Delete out-dated keys & values from the cache."""
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with self._lock:
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expired_values = [(k, v) for k, v in six.iteritems(self._data)
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if v.expired]
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for (k, _v) in expired_values:
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del self._data[k]
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if on_expired_callback is not None:
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arg_c = len(reflection.get_callable_args(on_expired_callback))
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for (k, v) in expired_values:
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if arg_c == 2:
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on_expired_callback(k, v)
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else:
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on_expired_callback(v)
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