102 lines
2.5 KiB
C++
102 lines
2.5 KiB
C++
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/* ScummVM - Graphic Adventure Engine
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*
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* ScummVM is the legal property of its developers, whose names
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* are too numerous to list here. Please refer to the COPYRIGHT
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* file distributed with this source distribution.
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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 General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (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 General Public License for more details.
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*
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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, see <http://www.gnu.org/licenses/>.
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*
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*/
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#ifndef BAGEL_BOFLIB_CACHE_H
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#define BAGEL_BOFLIB_CACHE_H
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#include "bagel/boflib/llist.h"
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#include "bagel/boflib/stdinc.h"
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namespace Bagel {
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class CCache : private CLList {
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private:
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virtual bool alloc() = 0; // These pure-virtuals MUST be defined
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virtual void free() = 0; // in the derived class.
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static CCache *_pCacheList; // Linked cache list
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static uint32 _lOldest; // Current oldest object in cache
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static uint32 _lYoungest; // Current youngest object in cache
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static uint16 _nEntries; // Number of CCache Objects
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uint32 _lAge; // Age of this object
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int _nLockCount; // # of locks held on this object
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bool _bCached; // true if object is in the cache
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bool _bValid; // true if this object is valid
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public:
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/**
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* Constructor
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*/
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CCache();
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/**
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* Destructor
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*/
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virtual ~CCache();
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/**
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* Loads current object into cache
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*/
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void load();
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/**
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* Releases current object from cache
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*/
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bool release();
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void lock() {
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_nLockCount++;
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load();
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}
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void unlock() {
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_nLockCount--;
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}
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bool isLocked() {
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return (_nLockCount > 0);
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}
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/**
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* initialize statics
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*/
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static void initialize();
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/**
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* Releases all objects from cache
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*/
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static bool flush();
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/**
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* Releases older objects from cache if need memory
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* @remarks Optimizes cache so that the specified amount of memory is left available.
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* @param lRequestedFreeSpace Free space requested to remain available
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* @return true if there were any objects to release from the cache.
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* false if there were no objects released.
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*/
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static bool optimize(uint32 lRequestedFreeSpace);
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};
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} // namespace Bagel
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#endif
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