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121 lines
3.8 KiB
C++
121 lines
3.8 KiB
C++
/* 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_freemgr.h 33 2006-07-19 17:09:27Z mthomas $
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*
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******************************************************************************************/
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/** @file */
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#ifndef _WE_FREEMGR_H_
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#define _WE_FREEMGR_H_
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#include <stdlib.h>
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#include <we_dbfileop.h>
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#include <we_index.h>
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/** Namespace WriteEngine */
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namespace WriteEngine
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{
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/** Class FreeMgr */
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class FreeMgr : public DbFileOp
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{
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public:
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/**
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* @brief Constructor
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*/
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FreeMgr();
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/**
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* @brief Default Destructor
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*/
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~FreeMgr();
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/**
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* @brief init free chains in a new index file
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*/
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const int init( CommBlock &cb, const int freemgrType );
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/**
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* @brief Init free chains in a new file or an existing file
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* The start block is an FBO or an LBID depending on whether we are using BRM
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**/
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const int init( CommBlock &cb, DataBlock* blockZero, const int freemgrType , const IdxTreeGroupType chainType, const int startBlock, const int numberBlocks );
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/**
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* @brief find a free segment and return ptr
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*/
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const int assignSegment( CommBlock &cb, DataBlock* blockZero, const int freemgr_type, const IdxTreeGroupType segmentType, IdxEmptyListEntry* assignPtr ) ;
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/**
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* @brief put a free segment back into chain
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*/
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const int releaseSegment( CommBlock &cb, DataBlock* blockZero, const int freemgr_type, const IdxTreeGroupType segmentType, IdxEmptyListEntry* assignPtr ) ;
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/**
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* @brief Map an FBO to LBID
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*/
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const uint64_t mapLBID( CommBlock &cb, const uint64_t fbo, int &rc );
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/**
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* extendFreespace - ran out of space in one of the chains?
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* Add blocks via calls to BRM extent mgr and fseek the file to the end
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**/
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const int extendFreespace( CommBlock &cb, DataBlock* blockZero, const int freemgr_type );
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//private:
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/**
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* @brief Create sub block zero for use by free manager
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*/
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const int initBlockzero( DataBlock* blockZero);
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/**
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* @brief Handle release of sub-blocks separately - sometimes a sub-block contains list entries and sometimes it is a list entry
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*/
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const int releaseSubblock( CommBlock &cb, WriteEngine::DataBlock*, int, WriteEngine::IdxEmptyListEntry*) ;
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/**
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* @brief Handle assignment of sub-blocks separately - sometimes a sub-block contains list entries and sometimes it is a list entry
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*/
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const int assignSubblock( CommBlock &cb, WriteEngine::DataBlock*, int, WriteEngine::IdxEmptyListEntry*);
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/**
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* Blank out the entries in the structure
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**/
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const void nullPtr( WriteEngine::IdxEmptyListEntry* assignPtr ) const;
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const void printMemSubBlock( DataBlock* curBlock, const int sbid );
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inline const int calcPtrOffset( const int position ) const
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{ return 1+position; }
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inline const int calcStatOffset( const int position ) const
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{ return 8+position; }
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int initType;// decide which algorithm to use to init the chains
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int allowExtend; // allow file to be extended
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};
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} //end of namespace
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#endif // _WE_FREEMGR_H_
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