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138 lines
3.6 KiB
C++
138 lines
3.6 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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#ifndef BLOCKREQUESTPROCESSOR_H
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#define BLOCKREQUESTPROCESSOR_H
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/***************************************************************************
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*
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* $Id: blockrequestprocessor.h 725 2008-09-26 16:26:47Z jrodriguez $
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*
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* jrodriguez@calpont.com *
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* *
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***************************************************************************/
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#include "blocksize.h"
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#include "fileblockrequestqueue.h"
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#include "filebuffermgr.h"
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#include "iomanager.h"
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/**
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@author Jason Rodriguez <jrodriguez@calpont.com>
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*/
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namespace dbbc {
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typedef std::list<FileBuffer> FileBufferList_t;
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/**
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* @brief class to control the populating of the Disk Block Buffer Cache and manage Block requests.
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**/
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class BlockRequestProcessor {
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public:
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/**
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* @brief default ctor
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**/
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BlockRequestProcessor(uint32_t numBlcks, int thrCount, int blocksPerRead, uint32_t deleteBlocks=0,
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uint32_t blckSz=BLOCK_SIZE);
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/**
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* @brief default dtor
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**/
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virtual ~BlockRequestProcessor();
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/**
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* @brief send a request for disk blocks to the IO manager
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**/
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int sendRequest(fileRequest& blk);
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/**
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* @brief verify that the lbid@ver disk block is in the block cache. Send request if it is not
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**/
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int check(BRM::LBID_t lbid, BRM::VER_t ver, bool flg, bool& wasBlockInCache);
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/**
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* @brief verify the LBIDRange of disk blocks is in the block cache. Send request if it is not
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**/
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int check(const BRM::InlineLBIDRange& range, const BRM::VER_t ver, uint32_t& lbidCount);
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/**
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* @brief retrieve the lbid@ver disk block from the block cache
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**/
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FileBuffer* getBlockPtr(const BRM::LBID_t lbid, const BRM::VER_t ver);
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const int read(const BRM::LBID_t& lbid, const BRM::VER_t& ver, FileBuffer& fb);
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/**
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* @brief retrieve the lbid@ver disk block from the block cache
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**/
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const int read(const BRM::LBID_t& lbid, const BRM::VER_t& ver, void* bufferPtr);
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/**
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* @brief retrieve the LBIDRange of disk blocks from the block cache
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**/
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const int read(const BRM::InlineLBIDRange& range, FileBufferList_t& fbList, const BRM::VER_t ver);
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const int getBlock(const BRM::LBID_t& lbid, const BRM::VER_t& ver, void* bufferPtr,
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bool flg, bool &wasCached);
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bool exists(BRM::LBID_t lbid, BRM::VER_t ver);
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/**
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* @brief
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**/
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void flushCache();
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//const uint32_t resize(const uint32_t s);
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std::ostream& formatLRUList(std::ostream& os) const;
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private:
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FileBufferMgr fbMgr;
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fileBlockRequestQueue fBRPRequestQueue;
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ioManager fIOMgr;
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pthread_mutex_t check_mutex;
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/**
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* helper function for public check functions
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**/
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int check(fileRequest& rqstBlk);
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/**
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* send stop requests for IOmanager and request Q
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**/
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void stop();
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std::ofstream fLogFile;
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bool fTrace;
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BRM::DBRM fdbrm;
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// do not implement
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BlockRequestProcessor(const BlockRequestProcessor& brp);
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BlockRequestProcessor& operator=(const BlockRequestProcessor& brp);
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};
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}
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#endif
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