mirror of https://gitee.com/bigwinds/arangodb
117 lines
3.7 KiB
C++
117 lines
3.7 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 Dr. Frank Celler
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////////////////////////////////////////////////////////////////////////////////
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#ifndef ARANGOD_MMFILES_MMFILES_COMPACTOR_THREAD_H
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#define ARANGOD_MMFILES_MMFILES_COMPACTOR_THREAD_H 1
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#include "Basics/Common.h"
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#include "Basics/ConditionVariable.h"
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#include "Basics/Thread.h"
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#include "VocBase/voc-types.h"
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struct MMFilesDatafile;
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struct MMFilesMarker;
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struct TRI_vocbase_t;
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namespace arangodb {
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struct CompactionContext;
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class LogicalCollection;
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namespace transaction {
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class Methods;
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}
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class MMFilesCompactorThread final : public Thread {
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private:
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/// @brief compaction instruction for a single datafile
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struct CompactionInfo {
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MMFilesDatafile* _datafile;
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bool _keepDeletions;
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};
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/// @brief auxiliary struct used when initializing compaction
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struct CompactionInitialContext {
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transaction::Methods* _trx;
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LogicalCollection* _collection;
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int64_t _targetSize;
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TRI_voc_fid_t _fid;
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bool _keepDeletions;
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bool _failed;
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CompactionInitialContext(transaction::Methods* trx, LogicalCollection* collection)
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: _trx(trx),
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_collection(collection),
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_targetSize(0),
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_fid(0),
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_keepDeletions(false),
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_failed(false) {}
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};
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public:
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explicit MMFilesCompactorThread(TRI_vocbase_t* vocbase);
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~MMFilesCompactorThread();
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void signal();
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/// @brief callback to drop a datafile
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static void DropDatafileCallback(MMFilesDatafile* datafile, LogicalCollection* collection);
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/// @brief callback to rename a datafile
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static void RenameDatafileCallback(MMFilesDatafile* datafile, MMFilesDatafile* compactor,
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LogicalCollection* collection);
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protected:
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void run() override;
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private:
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/// @brief calculate the target size for the compactor to be created
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CompactionInitialContext getCompactionContext(transaction::Methods* trx,
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LogicalCollection* collection,
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std::vector<CompactionInfo> const& toCompact);
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/// @brief compact the specified datafiles
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void compactDatafiles(LogicalCollection* collection, std::vector<CompactionInfo> const&);
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/// @brief checks all datafiles of a collection
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bool compactCollection(LogicalCollection* collection, bool& wasBlocked);
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int removeCompactor(LogicalCollection* collection, MMFilesDatafile* datafile);
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/// @brief remove an empty datafile
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int removeDatafile(LogicalCollection* collection, MMFilesDatafile* datafile);
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/// @brief determine the number of documents in the collection
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uint64_t getNumberOfDocuments(LogicalCollection* collection);
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/// @brief write a copy of the marker into the datafile
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int copyMarker(MMFilesDatafile* compactor, MMFilesMarker const* marker,
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MMFilesMarker** result);
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private:
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TRI_vocbase_t* _vocbase;
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arangodb::basics::ConditionVariable _condition;
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};
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} // namespace arangodb
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#endif
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