ae28f0ba4b
Updated WorkerTaskExecutor to use cache for remote tasks. Change-Id: I4572052f63647472367cb69fc02911bbec2bd4cc
58 lines
1.8 KiB
Python
58 lines
1.8 KiB
Python
# -*- coding: utf-8 -*-
|
|
|
|
# Copyright (C) 2014 Yahoo! Inc. All Rights Reserved.
|
|
#
|
|
# 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.
|
|
|
|
import logging
|
|
|
|
import six
|
|
|
|
from taskflow.utils import lock_utils as lu
|
|
|
|
LOG = logging.getLogger(__name__)
|
|
|
|
|
|
class Cache(object):
|
|
"""Represents thread-safe cache."""
|
|
|
|
def __init__(self):
|
|
self._data = {}
|
|
self._lock = lu.ReaderWriterLock()
|
|
|
|
def get(self, key):
|
|
"""Retrieve a value from the cache."""
|
|
with self._lock.read_lock():
|
|
return self._data.get(key)
|
|
|
|
def set(self, key, value):
|
|
"""Set a value in the cache."""
|
|
with self._lock.write_lock():
|
|
self._data[key] = value
|
|
LOG.debug("Cache updated. Capacity: %s", len(self._data))
|
|
|
|
def delete(self, key):
|
|
"""Delete a value from the cache."""
|
|
with self._lock.write_lock():
|
|
self._data.pop(key, None)
|
|
|
|
def cleanup(self, on_expired_callback=None):
|
|
"""Delete out-dated values from the cache."""
|
|
with self._lock.write_lock():
|
|
expired_values = [(k, v) for k, v in six.iteritems(self._data)
|
|
if v.expired]
|
|
for k, v in expired_values:
|
|
if on_expired_callback:
|
|
on_expired_callback(v)
|
|
self._data.pop(k, None)
|