mirror of https://gitee.com/bigwinds/arangodb
103 lines
3.1 KiB
C++
103 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_VOCBASE_COLLECTION_REVISIONS_CACHE_H
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#define ARANGOD_VOCBASE_COLLECTION_REVISIONS_CACHE_H 1
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#include "Basics/Common.h"
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#include "Basics/AssocUnique.h"
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#include "Basics/ReadWriteLock.h"
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#include "VocBase/ManagedDocumentResult.h"
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#include "VocBase/ReadCache.h"
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#include "VocBase/voc-types.h"
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namespace arangodb {
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namespace wal {
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class Logfile;
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}
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class LogicalCollection;
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class RevisionCacheChunkAllocator;
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class Transaction;
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class CollectionRevisionsCache {
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public:
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CollectionRevisionsCache(LogicalCollection*, RevisionCacheChunkAllocator*);
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~CollectionRevisionsCache();
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public:
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uint32_t chunkSize() const;
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std::string name() const;
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void closeWriteChunk();
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void clear();
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void sizeHint(int64_t hint);
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bool allowInvalidation() const {
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return _allowInvalidation.load();
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}
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void allowInvalidation(bool value) {
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_allowInvalidation.store(value);
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}
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// look up a revision
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bool lookupRevision(arangodb::Transaction* trx, ManagedDocumentResult& result, TRI_voc_rid_t revisionId, bool shouldLock);
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// conditionally look up a revision
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bool lookupRevisionConditional(arangodb::Transaction* trx, ManagedDocumentResult& result, TRI_voc_rid_t revisionId, TRI_voc_tick_t maxTick, bool excludeWal, bool shouldLock);
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// insert from chunk
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void insertRevision(TRI_voc_rid_t revisionId, RevisionCacheChunk* chunk, uint32_t offset, uint32_t version, bool shouldLock);
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// insert from WAL
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void insertRevision(TRI_voc_rid_t revisionId, wal::Logfile* logfile, uint32_t offset, bool shouldLock);
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// remove a revision
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void removeRevision(TRI_voc_rid_t revisionId);
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// remove multiple revisions
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void removeRevisions(std::vector<TRI_voc_rid_t> const& revisions);
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private:
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uint8_t const* readFromEngine(TRI_voc_rid_t revisionId);
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uint8_t const* readFromEngineConditional(TRI_voc_rid_t revisionId, TRI_voc_tick_t maxTick, bool excludeWal);
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private:
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arangodb::basics::ReadWriteLock _lock;
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arangodb::basics::AssocUnique<TRI_voc_rid_t, RevisionCacheEntry> _revisions;
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LogicalCollection* _collection;
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ReadCache _readCache;
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std::atomic<bool> _allowInvalidation;
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};
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} // namespace arangodb
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#endif
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