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607 lines
13 KiB
C++
607 lines
13 KiB
C++
// Ryzom - MMORPG Framework <http://dev.ryzom.com/projects/ryzom/>
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// Copyright (C) 2010 Winch Gate Property Limited
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//
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// This program is free software: you can redistribute it and/or modify
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// it under the terms of the GNU Affero General Public License as
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// published by the Free Software Foundation, either version 3 of the
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// License, or (at your option) any later version.
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//
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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 Affero General Public License for more details.
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//
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// You should have received a copy of the GNU Affero General Public License
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// along with this program. If not, see <http://www.gnu.org/licenses/>.
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#ifndef NL_PDS_TABLE_BUFFER_H
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#define NL_PDS_TABLE_BUFFER_H
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#include <nel/misc/types_nl.h>
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#include <nel/misc/path.h>
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#include "../pd_lib/pd_utils.h"
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#include "../pd_lib/pd_server_utils.h"
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#include "../pd_lib/db_reference_file.h"
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#include "../pd_lib/db_delta_file.h"
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class IRowProcessor;
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/**
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* A memory cache for table
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* \author Benjamin Legros
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* \author Nevrax France
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* \date 2003
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*/
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class CTableBuffer : public CPDSLogger
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{
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public:
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/// Constructor
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CTableBuffer();
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/// Destructor
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~CTableBuffer();
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/// Clear all
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void clear();
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/// Init
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void init(uint32 tableId, uint32 rowSize, bool mapped);
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/// Setup Ref
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void setupRef(CRefIndex& ref);
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/// Init, only for reference builder
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void init(uint32 tableId, const std::string& refRootPath, const std::string& refPath); //CRefIndex& ref);
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/// Row Data Type
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typedef uint8* TRowData;
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/// Map of Rows
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typedef CHashMap<RY_PDS::TRowIndex, TRowData> TRowMap;
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/**
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* Row Accessor, embeds any row access
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*/
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class CAccessor
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{
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public:
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/// Get row index
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RY_PDS::TRowIndex row() const { return (*_MapIt).first; }
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/// Get row data
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TRowData data() { return (*_MapIt).second + (_Mapped ? sizeof(CMappedHeader) : sizeof(CHeader)); }
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/// Get row data
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TRowData data() const { return (*_MapIt).second + (_Mapped ? sizeof(CMappedHeader) : sizeof(CHeader)); }
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/// Default Constructor, should never be used
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explicit CAccessor() { }
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/// Is Row Allocated
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bool allocated() const { return ((CHeader*)fullRow())->allocated(); }
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/// Is Row Mapped
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bool mapped() const { return _Mapped && ((CMappedHeader*)fullRow())->mapped(); }
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/// Is Row Dirty
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bool dirty() const { return ((CHeader*)fullRow())->dirty(); }
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/// Get Dirt stamp
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uint32 dirtyStamp() const { return ((CHeader*)fullRow())->getDirtStamp(); }
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/// Get Map Key
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uint64 key() const { return mapped() ? ((CMappedHeader*)fullRow())->getKey() : 0; }
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/// Get Full Row Data
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TRowData fullRow() const { return (*_MapIt).second; }
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/// Equals
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bool operator == (const CAccessor& access) const { return _Mapped == access._Mapped && _MapIt == access._MapIt; }
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/**
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* Copy header info from another accessor
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* Warning, this is only a local copy of header, data won't been updated in parent CTableBuffer
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*/
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void copyHeader(const CAccessor& access);
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private:
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friend class CTableBuffer;
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/// Accessor in table map
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typedef TRowMap::iterator TMapIt;
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TMapIt _MapIt;
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bool _Mapped;
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/// Constructor for CTableBuffer
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CAccessor(TMapIt it, bool mapped) : _MapIt(it), _Mapped(mapped) { }
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/// Get Full Row Data
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TRowData fullRow() { return (*_MapIt).second; }
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};
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/**
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* Return a pointer to straight row data
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* If row is not loaded, data are loaded from table file
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*/
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CAccessor getRow(RY_PDS::TRowIndex row);
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/**
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* Return a pointer to straight new row data
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* Row is filled with blank, not loaded from file
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*/
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CAccessor getEmptyRow(RY_PDS::TRowIndex row);
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/**
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* Acquire a Row
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* Row is marked as non releasable until it is released enough time
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*/
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bool acquireRow(CAccessor accessor);
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/**
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* Release a Row
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* Row is marked as purgeable, and will be purged as soon as possible,
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* unless it is reactivated before purge
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*/
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bool releaseRow(CAccessor accessor);
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/**
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* Release a Row
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* Row is marked as purgeable, and will be purged as soon as possible,
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* unless it is reactivated before purge
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*/
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bool releaseRow(RY_PDS::TRowIndex row);
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/**
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* Release all rows
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* To be called when client disconnects, so all loaded rows may be released without
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* client releasing them manually
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*/
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bool releaseAll();
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/**
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* Mark a Row as being dirty for later delta save
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*/
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bool dirtyRow(CAccessor accessor);
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/**
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* Build Delta
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*/
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bool buildDelta(const CTimestamp& starttimestamp, const CTimestamp& endtimestamp);
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/**
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* Apply delta changes from a file
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*/
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bool applyDeltaChanges(const std::string& filename);
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/**
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* Flush Released Rows from memory
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*/
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void flushReleased();
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/**
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* Reset dirty tags
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*/
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void resetDirty();
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/**
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* Flush Reference files
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*/
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void flushRefFiles();
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/**
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* Purge all references
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* Flush loaded reference files, and close them all.
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*/
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bool purgeReferences();
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/**
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* Open all reference files in reference directory to update
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*/
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bool openAllRefFilesWrite();
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/**
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* Open all reference files in reference directory to read
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*/
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bool openAllRefFilesRead();
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/**
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* Update delta ids for all references
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*/
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bool updateDeltaIds(uint32 start, uint32 end);
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/**
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* Allocate a row
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* \param row is the row index to allocate
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* Return true if succeded
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*/
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bool allocate(RY_PDS::TRowIndex row, CAccessor& accessor);
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/**
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* Deallocate a row
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* \param row is the row index to deallocate
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* Return true if succeded
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*/
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bool deallocate(RY_PDS::TRowIndex row);
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/**
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* Tells if a row is allocated
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* \param row is the row to check
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*/
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bool isAllocated(RY_PDS::TRowIndex row) const { return _RowMapper.allocated(row); }
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/**
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* Get number of actually allocated rows
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*/
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uint32 numAllocated() const { return _RowMapper.numAllocated(); }
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/**
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* Get Max row index used
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*/
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RY_PDS::TRowIndex maxRowIndex() const { return _RowMapper.maxRowIndex(); }
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/**
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* Get Next Unalloocated row
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*/
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RY_PDS::TRowIndex nextUnallocatedRow() const { return _RowMapper.nextUnallocatedRow(); }
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/**
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* Map a row
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* \param index is the index to map
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* \param key is the 64 bits row key
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* Return true if succeded
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*/
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bool mapRow(const RY_PDS::CObjectIndex &index, uint64 key);
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/**
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* Unmap a row in a table
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* \param key is the 64 bits row key
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* Return true if succeded
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*/
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bool unmapRow(const RY_PDS::CObjectIndex &index, uint64 key);
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/**
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* Get a mapped row
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* \param key is the 64 bits row key
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* Return a valid CObjectIndex if success
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*/
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RY_PDS::CObjectIndex getMappedRow(uint64 key) const;
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/**
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* Get number of actually allocated rows
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*/
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uint32 numMapped() const { return _RowMapper.numMapped(); }
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/**
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* Get the number of actually loaded rows
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*/
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uint32 getLoadedRows() const { return (uint32)_RowMap.size(); }
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/**
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* Get memory load
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*/
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uint32 getMemoryLoad() const { return (uint32)_RowMap.size()*_InternalRowSize; }
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/**
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* Build RowMapper
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*/
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bool buildRowMapper();
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/**
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* Process Rows, apply external row processing after rows are loaded
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*/
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bool processRows(IRowProcessor* processor);
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/**
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* Link RowMapper
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*/
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void linkRowMapper(CTableBuffer* link) { _RowMapper.link(&(link->_RowMapper)); }
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/**
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* Get Size of Row Header (depends on whether table is mapped or not)
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*/
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uint getHeaderSize() const { return _Mapped ? sizeof(CMappedHeader) : sizeof(CHeader); }
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/**
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* Get Internal Row Size
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*/
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uint getInternalRowSize() const { return _InternalRowSize; }
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/**
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* Get User Row Size
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*/
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uint getRowSize() const { return _InternalRowSize; }
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/**
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* Update a Row
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* Update in reference file the whole row
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*/
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bool updateRow(CAccessor accessor);
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/**
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* Get current Timestamp
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*/
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static uint32 getCommonStamp() { return _CommonStamp; }
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/**
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* Update common Timestamp
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*/
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static void updateCommonStamp();
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/// \name Debug
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// @{
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/**
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* Setup debug delta file
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*/
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bool setupDebugDeltaFile(const std::string& filename, CDBDeltaFile& delta) const;
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/**
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* Get Delta file Row
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*/
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uint8* getDeltaRow(uint32& row, CDBDeltaFile& delta) const;
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// @}
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protected:
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virtual std::string getLoggerIdentifier() const { return "buffer"; }
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private:
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/// Initialised
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bool _Init;
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/// Table Id
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uint32 _TableId;
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/// Row Size
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uint32 _RowSize;
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/// Internal Row Size
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uint32 _InternalRowSize;
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/// Ref Root Path
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std::string _RefRootPath;
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/// Ref Path
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std::string _RefPath;
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/// Rows per ref file
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uint32 _RowsPerFile;
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/// Maximum ref file size
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static uint32 _MaxRefFileSize;
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/// Row Map
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TRowMap _RowMap;
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/// Map of purgeable rows
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typedef std::set<RY_PDS::TRowIndex> TReleaseSet;
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/// Release Map
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TReleaseSet _ReleaseSet;
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/// List of dirty rows
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typedef std::vector<CAccessor> TDirtyList;
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/// Dirty List
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TDirtyList _DirtyList;
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/// List of ref files -- a vector or pointer, to avoid realloc issues
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typedef std::vector<CDBReferenceFile*> TRefFileMap;
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/// Reference files
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TRefFileMap _RefFileMap;
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/// Index and Allocation Map
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CRowMapper _RowMapper;
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/// Rows are mapped?
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bool _Mapped;
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/// Current Delta Id
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uint32 _CurrentDeltaId;
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/// Current reference stamp
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uint32 _ReferenceStamp;
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/// Common stamp
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static uint32 _CommonStamp;
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/// Load a row from the appropriate reference file
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bool loadRow(RY_PDS::TRowIndex row, TRowData rowData);
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/// Init Number of Rows per File
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bool initRowsPerFile();
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/// Check reference file is ready
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bool checkRef(uint32 refFile);
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/// Acquire a row, internal version
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bool acquireRow(TRowMap::iterator it);
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/// Release a row, internal version
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bool releaseRow(TRowMap::iterator it, bool forceNotAcquired = false);
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/// Update a Row -- rowdata is _InternalByteSize long, this is a full buffer row with header
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bool updateRow(RY_PDS::TRowIndex row, const TRowData rowData, bool forceWriteToDisk);
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/// Get Reference Files list
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void getReferenceFilesList(std::vector<std::string> &result);
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/// Process row for RowMapper
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bool processRow(CAccessor& accessor);
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/// Header of a row
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class CHeader
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{
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public:
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enum
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{
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Dirty = 1,
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Allocated = 2,
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};
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/// Clear
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void clear() { _Flags = 0; _Acquire = 0; _DirtStamp = 0; }
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/// GetFlags
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uint8 getFlags() const { return _Flags; }
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/// Is Row Dirty
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bool dirty() const { return checkFlags(Dirty); }
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/// Is Row Allocated
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bool allocated() const { return checkFlags(Allocated); }
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/// Set flags
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void setFlags(uint8 flags) { _Flags |= flags; }
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/// Set flags
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void clearFlags(uint8 flags) { _Flags &= (~flags); }
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/// Check Flags
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bool checkFlags(uint8 testflags) const { return (_Flags & testflags) != 0; }
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/// Set Row As Dirty
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void setDirty();
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/// Clear DirtStamp (set initial dirt stamp as 'no dirt stamp' value)
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void clearDirtStamp() { _DirtStamp = 0; clearFlags(Dirty); }
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/// Get DirtStamp
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uint32 getDirtStamp() const { return _DirtStamp; }
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/// Acquire, return true the first time it is acquired
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bool acquire()
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{
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++_Acquire;
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return _Acquire == 1;
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}
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/// Release, return true if row can be release effectively
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bool unacquire()
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{
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--_Acquire;
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if (_Acquire < 0)
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_Acquire = 0;
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return !isAcquired();
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}
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/// Clear Acquire count
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void clearAcquireCount() { _Acquire = 0; }
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/// Is acquired
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bool isAcquired() const { return _Acquire > 0; }
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protected:
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/// Row flags
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uint8 _Flags;
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/// Acquire counter
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sint16 _Acquire;
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/// Row Dirty Timestamp
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uint32 _DirtStamp;
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};
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/// Header of a mapped row
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class CMappedHeader : public CHeader
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{
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public:
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/// Clear up header
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void clear() { CHeader::clear(); _Key = 0; }
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/// Set Row Key
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void setKey(uint64 key) { _Key = key; }
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/// Get Row Key
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uint64 getKey() const { return _Key; }
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/// Is Row Mapped?
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bool mapped() const { return _Key != 0; }
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protected:
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/**
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* Row map key
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* The key of the row in table map, 0 means this row is not mapped
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*/
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uint64 _Key;
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};
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friend class CAccessor;
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friend class CDatabaseAdapter;
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};
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/**
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* A callback interface for row processing at loading
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* \author Benjamin Legros
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* \author Nevrax France
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* \date 2003
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*/
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class IRowProcessor
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{
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public:
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virtual bool processRow(RY_PDS::TTableIndex table, CTableBuffer::CAccessor& accessor) = 0;
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};
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#include "pds_table_buffer_inline.h"
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#endif // NL_PDS_TABLE_BUFFER_H
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/* End of pds_table_buffer.h */
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