mirror of https://gitee.com/bigwinds/arangodb
94 lines
3.1 KiB
C++
94 lines
3.1 KiB
C++
////////////////////////////////////////////////////////////////////////////////
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/// DISCLAIMER
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///
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/// Copyright 2014-2016 ArangoDB GmbH, Cologne, Germany
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/// Copyright 2004-2014 triAGENS GmbH, Cologne, Germany
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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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///
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/// Copyright holder is ArangoDB GmbH, Cologne, Germany
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///
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/// @author Jan Steemann
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////////////////////////////////////////////////////////////////////////////////
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#ifndef ARANGOD_READ_CACHE_COLLECTION_REVISION_CACHE_H
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#define ARANGOD_READ_CACHE_COLLECTION_REVISION_CACHE_H 1
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#include "Basics/Common.h"
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#include "Basics/ReadWriteLock.h"
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#include "ReadCache/RevisionReader.h"
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#include "ReadCache/RevisionTypes.h"
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#include "VocBase/voc-types.h"
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namespace arangodb {
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class GlobalRevisionCache;
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namespace wal {
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class LogfileManager;
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}
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class GlobalRevisionCacheChunk;
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// the global revision cache for documents
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class CollectionRevisionCache {
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public:
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CollectionRevisionCache() = delete;
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CollectionRevisionCache(CollectionRevisionCache const&) = delete;
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CollectionRevisionCache& operator=(CollectionRevisionCache const&) = delete;
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// create the cache instance
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CollectionRevisionCache(TRI_voc_cid_t collectionId,
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GlobalRevisionCache* globalCache,
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arangodb::wal::LogfileManager* logfileManager);
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// destroy the cache instance
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~CollectionRevisionCache();
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public:
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// insert a revision into the shard-local cache from the WAL
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void insertFromWal(uint64_t revisionId, TRI_voc_fid_t datafileId, uint32_t offset);
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// insert a revision into the shard-local cache from the revision cache
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void insertFromRevisionCache(uint64_t revisionId, RevisionReader* reader);
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// remove a revision from the shard-local cache
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void remove(uint64_t revisionId);
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// read a revision from the shard-local cache. the revision can safely be accessed
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// while the RevisionReader is in place
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RevisionReader lookup(uint64_t revisionId);
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private:
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// collection id
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TRI_voc_cid_t const _collectionId;
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// global document revision cache
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GlobalRevisionCache* _globalCache;
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// WAL logfile manager, used for reference counting of WAL files
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arangodb::wal::LogfileManager* _logfileManager;
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// note: _revisionsLock and _revisions should be physically partitioned
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// in order to avoid lock contention
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// lock for the revision hash table
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arangodb::basics::ReadWriteLock _revisionsLock;
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// hash table for revisions
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std::unordered_map<uint64_t, RevisionLocation> _revisions;
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};
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}
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#endif
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