# Copyright 2012 OpenStack Foundation.
# 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.
from oslo_concurrency import lockutils
from oslo_config import cfg
from searchlight.common import wsgi
CONF = cfg.CONF
_CACHED_THREAD_POOL = {}
def memoize(lock_name):
def memoizer_wrapper(func):
@lockutils.synchronized(lock_name)
def memoizer(lock_name):
if lock_name not in _CACHED_THREAD_POOL:
_CACHED_THREAD_POOL[lock_name] = func()
return _CACHED_THREAD_POOL[lock_name]
return memoizer(lock_name)
return memoizer_wrapper
def get_thread_pool(lock_name, size=1024):
"""Initializes eventlet thread pool.
If thread pool is present in cache, then returns it from cache
else create new pool, stores it in cache and return newly created
pool.
@param lock_name: Name of the lock.
@param size: Size of eventlet pool.
@return: eventlet pool
"""
@memoize(lock_name)
def _get_thread_pool():
return wsgi.get_asynchronous_eventlet_pool(size=size)
return _get_thread_pool
