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99 lines
2.7 KiB
99 lines
2.7 KiB
#!/usr/bin/env python
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# -*- coding: utf-8 -*-
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#
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# Copyright 2011-2013 Codernity (http://codernity.com)
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain 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,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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from CodernityDB3.misc import NONE
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def __patch(obj, name, new):
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n = NONE()
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orig = getattr(obj, name, n)
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if orig is not n:
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if orig == new:
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raise Exception("Shouldn't happen, new and orig are the same")
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setattr(obj, name, new)
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return
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def patch_cache_lfu(lock_obj):
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"""
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Patnches cache mechanizm to be thread safe (gevent ones also)
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.. note::
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It's internal CodernityDB mechanizm, it will be called when needed
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"""
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from . import lfu_cache
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from . import lfu_cache_with_lock
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lfu_lock1lvl = lfu_cache_with_lock.create_cache1lvl(lock_obj)
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lfu_lock2lvl = lfu_cache_with_lock.create_cache2lvl(lock_obj)
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__patch(lfu_cache, 'cache1lvl', lfu_lock1lvl)
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__patch(lfu_cache, 'cache2lvl', lfu_lock2lvl)
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def patch_cache_rr(lock_obj):
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"""
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Patches cache mechanizm to be thread safe (gevent ones also)
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.. note::
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It's internal CodernityDB mechanizm, it will be called when needed
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"""
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from . import rr_cache
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from . import rr_cache_with_lock
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rr_lock1lvl = rr_cache_with_lock.create_cache1lvl(lock_obj)
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rr_lock2lvl = rr_cache_with_lock.create_cache2lvl(lock_obj)
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__patch(rr_cache, 'cache1lvl', rr_lock1lvl)
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__patch(rr_cache, 'cache2lvl', rr_lock2lvl)
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def patch_flush_fsync(db_obj):
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"""
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Will always execute index.fsync after index.flush.
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.. note::
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It's for advanced users, use when you understand difference between `flush` and `fsync`, and when you definitely need that.
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It's important to call it **AFTER** database has all indexes etc (after db.create or db.open)
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Example usage::
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...
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db = Database('/tmp/patch_demo')
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db.create()
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patch_flush_fsync(db)
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...
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"""
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def always_fsync(ind_obj):
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def _inner():
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ind_obj.orig_flush()
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ind_obj.fsync()
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return _inner
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for index in db_obj.indexes:
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setattr(index, 'orig_flush', index.flush)
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setattr(index, 'flush', always_fsync(index))
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setattr(db_obj, 'orig_flush', db_obj.flush)
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setattr(db_obj, 'flush', always_fsync(db_obj))
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return
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