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 : 2009-04-11 00022 ** Authors : 00023 ** Marc Wathelet 00024 ** Marc Wathelet (LGIT, Grenoble, France) 00025 ** 00026 ***************************************************************************/ 00027 00028 #ifndef ABSTRACTNUMERICALCACHE_H 00029 #define ABSTRACTNUMERICALCACHE_H 00030 00031 #include "QGpCoreToolsDLLExport.h" 00032 #include "Global.h" 00033 #include "CacheItem.h" 00034 #include "AbstractNumericalKey.h" 00035 00036 namespace QGpCoreTools { 00037 00038 class HashNumericalKey; 00039 00040 class QGPCORETOOLS_EXPORT AbstractNumericalCache 00041 { 00042 public: 00043 inline AbstractNumericalCache(AbstractNumericalKey * key); 00044 virtual ~AbstractNumericalCache() {delete _key;} 00045 00046 virtual void init()=0; 00047 const AbstractNumericalKey& key() const {return *_key;} 00048 00049 static const AbstractNumericalCache * begin(AbstractNumericalKey * key); 00050 static void end(const AbstractNumericalCache * cache); 00051 static void clear(); 00052 private: 00053 static AbstractNumericalCache * add(AbstractNumericalKey * key); 00054 00055 clock_t lastUse() const {return _lastUse;} 00056 void use() const {_lastUse=clock();} 00057 00058 inline void setLocked(bool l) const; 00059 bool locked() const {return !_locked.testAndSetOrdered(0, 0);} 00060 00061 AbstractNumericalKey * _key; 00062 mutable clock_t _lastUse; 00063 mutable QAtomicInt _locked; 00064 00065 static QMutex _mutex; 00066 static QHash<HashNumericalKey, AbstractNumericalCache *> _caches; 00067 static int _currentByteCount; 00068 static int _maximumByteCount; 00069 }; 00070 00071 inline AbstractNumericalCache::AbstractNumericalCache(AbstractNumericalKey * key) 00072 { 00073 _key=key; 00074 _lastUse=clock(); 00075 _locked=0; 00076 } 00077 00078 inline void AbstractNumericalCache::setLocked(bool l) const 00079 { 00080 if(l) { 00081 _locked.fetchAndAddOrdered (1); 00082 } else { 00083 ASSERT(_locked.fetchAndAddOrdered ( -1)>=0); 00084 } 00085 } 00086 00087 } // namespace QGpCoreTools 00088 00089 #endif // ABSTRACTNUMERICALCACHE_H
