00001 /*************************************************************************** 00002 ** 00003 ** This file is part of QGpCoreTools. 00004 ** 00005 ** This library is free software; you can redistribute it and/or 00006 ** modify it under the terms of the GNU Lesser General Public 00007 ** License as published by the Free Software Foundation; either 00008 ** version 2.1 of the License, or (at your option) any later version. 00009 ** 00010 ** This file is distributed in the hope that it will be useful, but WITHOUT 00011 ** ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 00012 ** FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public 00013 ** License for more details. 00014 ** 00015 ** You should have received a copy of the GNU Lesser General Public 00016 ** License along with this library; if not, write to the Free Software 00017 ** Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA 00018 ** 00019 ** See http://www.geopsy.org for more information. 00020 ** 00021 ** Created : 2006-07-06 00022 ** Authors : 00023 ** Marc Wathelet 00024 ** Marc Wathelet (LGIT, Grenoble, France) 00025 ** 00026 ***************************************************************************/ 00027 00028 #ifndef CACHE_H 00029 #define CACHE_H 00030 00031 #include "QGpCoreToolsDLLExport.h" 00032 #include "Translations.h" 00033 00034 namespace QGpCoreTools { 00035 00036 #define INV_MEGABYTES 9.5367431640625e-07 00037 #define MEGABYTES 1048576.0 00038 00039 class CacheItem; 00040 00041 class AllocatedCacheItem : private QList<const CacheItem *> 00042 { 00043 TRANSLATIONS("AllocatedCacheItem") 00044 public: 00045 AllocatedCacheItem() {} 00046 ~AllocatedCacheItem() {} 00047 00048 const CacheItem * bestToFree(); 00049 00050 void add(const CacheItem * sig) {append(sig);} 00051 void remove(const CacheItem * sig) {removeAt(indexOf(sig));} 00052 void clear() {QList<const CacheItem *>::clear();} 00053 int count() const {return QList<const CacheItem *>::count();} 00054 00055 QString humanInfo() const; 00056 }; 00057 00058 class QGPCORETOOLS_EXPORT Cache 00059 { 00060 TRANSLATIONS("Cache") 00061 public: 00062 Cache(); 00063 ~Cache() {} 00064 00065 // Parameters, not changed while cache is running 00066 void setSize(double nMegaBytes) {_maxLoadedBytes=nMegaBytes * MEGABYTES;} 00067 void setSwapDir(const QDir& d); 00068 00069 // Memory allocation and desallocation 00070 bool makeAvailable(const CacheItem * item); 00071 void free(CacheItem * item, bool saveTemp=true); 00072 bool enlarge(CacheItem * item, double finalSize); 00073 00074 double freeBytes() const {return _maxLoadedBytes -_loadedBytes;} 00075 double freeMegaBytes() const {return freeBytes() * INV_MEGABYTES;} 00076 private: 00077 friend class CacheItem; 00078 bool free(double byteSize); 00079 00080 AllocatedCacheItem _allocatedList; 00081 double _maxLoadedBytes; 00082 double _loadedBytes; 00083 QDir _swapDir; 00084 mutable QMutex _mutex; 00085 }; 00086 00087 } // namespace QGpCoreTools 00088 00089 #endif // CACHE_H
