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CodernityDB / CodernityDB / patch.py

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#!/usr/bin/env python
# -*- coding: utf-8 -*-
#
# Copyright 2011-2013 Codernity (http://codernity.com)
#
# 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 CodernityDB.misc import NONE


def __patch(obj, name, new):
    n = NONE()
    orig = getattr(obj, name, n)
    if orig is not n:
        if orig == new:
            raise Exception("Shouldn't happen, new and orig are the same")
        setattr(obj, name, new)
    return


def patch_cache_lfu(lock_obj):
    import lfu_cache
    import lfu_cache_with_lock
    lfu_lock1lvl = lfu_cache_with_lock.create_cache1lvl(lock_obj)
    lfu_lock2lvl = lfu_cache_with_lock.create_cache2lvl(lock_obj)
    __patch(lfu_cache, 'cache1lvl', lfu_lock1lvl)
    __patch(lfu_cache, 'cache2lvl', lfu_lock2lvl)


def patch_cache_rr(lock_obj):
    import rr_cache
    import rr_cache_with_lock
    rr_lock1lvl = rr_cache_with_lock.create_cache1lvl(lock_obj)
    rr_lock2lvl = rr_cache_with_lock.create_cache2lvl(lock_obj)
    __patch(rr_cache, 'cache1lvl', rr_lock1lvl)
    __patch(rr_cache, 'cache2lvl', rr_lock2lvl)