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the begginning
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david hill
156
writeengine/shared/we_bulkrollbackfilecompressed.h
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156
writeengine/shared/we_bulkrollbackfilecompressed.h
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/* Copyright (C) 2014 InfiniDB, Inc.
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This program is free software; you can redistribute it and/or
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modify it under the terms of the GNU General Public License
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as published by the Free Software Foundation; version 2 of
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the License.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
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MA 02110-1301, USA. */
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/*
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* $Id: we_bulkrollbackfilecompressed.h 4726 2013-08-07 03:38:36Z bwilkinson $
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*/
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/** @file
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* Contains class to restore compressed db files on behalf of BulkRollBackMgr.
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*/
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#ifndef WE_BULKROLLBACKFILECOMPRESSED_H_
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#define WE_BULKROLLBACKFILECOMPRESSED_H_
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#include <cstdio>
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#include <cstring>
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#include "we_define.h"
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#include "we_type.h"
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#include "we_bulkrollbackfile.h"
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#include "idbcompress.h"
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namespace WriteEngine
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{
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class BulkRollbackMgr;
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//------------------------------------------------------------------------------
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/** @brief Class used by BulkRollbackMgr to restore compressed db files.
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*/
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//------------------------------------------------------------------------------
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class BulkRollbackFileCompressed : public BulkRollbackFile
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{
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public:
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/** @brief BulkRollbackFile constructor
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* @param mgr The controlling BulkRollbackMgr object.
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*/
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BulkRollbackFileCompressed(BulkRollbackMgr* mgr);
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/** @brief BulkRollbackFile destructor
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*/
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virtual ~BulkRollbackFileCompressed();
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/** @brief Do we reinit trailing blocks in the HWM extent for the specified
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* segment file
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*
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* @param columnOID OID of the segment file in question
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* @param dbRoot DBRoot for the segment file in question
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* @param partNum Partition number for the segment file in question
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* @param segNum Segment number for the segment file in question
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*/
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virtual bool doWeReInitExtent( OID columnOID,
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uint32_t dbRoot,
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uint32_t partNum,
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uint32_t segNum) const;
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/** @brief Reinitialize the specified column segment file starting at
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* startOffsetBlk, and truncate trailing extents.
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* @param columnOID OID of the relevant segment file
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* @param dbRoot DBRoot of the relevant segment file
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* @param partNum Partition number of the relevant segment file
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* @param segNum Segment number of the relevant segment file
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* @param startOffsetBlk Starting block offset where file is to be
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* reinitialized
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* @param nBlocks Number of blocks to be reinitialized
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* @param colType Column type of the relevant segment file
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* @param colWidth Width in bytes of column.
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* @param restoreHwmChk Restore HWM chunk
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*/
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virtual void reInitTruncColumnExtent(OID columnOID,
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uint32_t dbRoot,
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uint32_t partNum,
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uint32_t segNum,
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long long startOffsetBlk,
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int nBlocks,
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execplan::CalpontSystemCatalog::ColDataType colType,
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uint32_t colWidth,
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bool restoreHwmChk );
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/** @brief Reinitialize the specified dictionary store segment file starting
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* at startOffsetBlk, and truncate trailing extents.
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* @param columnOID OID of the relevant segment file
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* @param dbRoot DBRoot of the relevant segment file
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* @param partNum Partition number of the relevant segment file
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* @param segNum Segment number of the relevant segment file
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* @param startOffsetBlk Starting block offset where file is to be
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* reinitialized
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* @param nBlocks Number of blocks to be reinitialized
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*/
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virtual void reInitTruncDctnryExtent(OID columnOID,
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uint32_t dbRoot,
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uint32_t partNum,
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uint32_t segNum,
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long long startOffsetBlk,
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int nBlocks );
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/** @brief Truncate the specified segment file to a specified num of bytes
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* @param columnOID OID of the relevant segment file
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* @param dbRoot DBRoot of the relevant segment file
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* @param partNum Partition number of the relevant segment file
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* @param segNum Segment number of the relevant segment file
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* @param fileSizeBlocks Number of blocks to retain in the file
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*/
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virtual void truncateSegmentFile( OID columnOID,
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uint32_t dbRoot,
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uint32_t partNum,
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uint32_t segNum,
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long long filesSizeBlocks );
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private:
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// Disable unnecessary copy constructor and assignment operator
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BulkRollbackFileCompressed(const BulkRollbackFileCompressed& rhs);
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BulkRollbackFileCompressed& operator=(const BulkRollbackFileCompressed& rhs);
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size_t readFillBuffer ( IDBDataFile* pFile,
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char* buffer,
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size_t bytesReq) const;
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int restoreHWMChunk ( IDBDataFile* pFile,
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OID columnOID,
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uint32_t partNum,
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uint32_t segNum,
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uint64_t fileOffsetByteForRestoredChunk,
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uint64_t& restoredChunkLen,
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uint64_t& restoredFileSize,
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std::string& errMsg );
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int loadColumnHdrPtrs ( IDBDataFile* pFile,
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char* hdrs,
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compress::CompChunkPtrList& chunkPtrs,
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std::string& errMsg) const;
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int loadDctnryHdrPtrs ( IDBDataFile* pFile,
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char* controlHdr,
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compress::CompChunkPtrList& chunkPtrs,
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uint64_t& ptrHdrSize,
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std::string& errMsg ) const;
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compress::IDBCompressInterface fCompressor;
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};
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} //end of namespace
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#endif // WE_BULKROLLBACKFILECOMPRESSED_H_
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