Gnash  0.8.10
MovieLibrary.h
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00001 // 
00002 //   Copyright (C) 2005, 2006, 2007, 2008, 2009, 2010, 2011, 2012
00003 //   Free Software Foundation, Inc
00004 // 
00005 // This program is free software; you can redistribute it and/or modify
00006 // it under the terms of the GNU General Public License as published by
00007 // the Free Software Foundation; either version 3 of the License, or
00008 // (at your option) any later version.
00009 // 
00010 // This program is distributed in the hope that it will be useful,
00011 // but WITHOUT ANY WARRANTY; without even the implied warranty of
00012 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
00013 // GNU General Public License for more details.
00014 // 
00015 // You should have received a copy of the GNU General Public License
00016 // along with this program; if not, write to the Free Software
00017 // Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
00018 
00019 #ifndef GNASH_MOVIELIBRARY_H
00020 #define GNASH_MOVIELIBRARY_H
00021 
00022 #include "rc.h"
00023 #include "movie_definition.h"
00024 
00025 #include <boost/intrusive_ptr.hpp>
00026 #include <string>
00027 #include <map>
00028 #include <algorithm>
00029 #include <boost/thread/thread.hpp>
00030 
00031 namespace gnash {
00032 
00034 //
00038 class MovieLibrary
00039 {
00040 public:
00041 
00042     struct LibraryItem
00043     {
00044         boost::intrusive_ptr<movie_definition> def;
00045         unsigned hitCount;
00046     };
00047 
00048     typedef std::map<std::string, LibraryItem> LibraryContainer;
00049 
00050     MovieLibrary()
00051         : 
00052         _limit(8) 
00053     {
00054         RcInitFile& rcfile = RcInitFile::getDefaultInstance();
00055             setLimit(rcfile.getMovieLibraryLimit());
00056     }
00057   
00061     void setLimit(LibraryContainer::size_type limit)
00062     {
00063         _limit = limit;  
00064         limitSize(_limit);  
00065     }
00066 
00067     bool get(const std::string& key,
00068             boost::intrusive_ptr<movie_definition>* ret)
00069     {
00070         boost::mutex::scoped_lock lock(_mapMutex);
00071         LibraryContainer::iterator it = _map.find(key);
00072         if (it == _map.end()) return false;
00073         
00074         *ret = it->second.def;
00075         it->second.hitCount++;
00076         return true;
00077     }
00078 
00079     void add(const std::string& key, movie_definition* mov)
00080     {
00081 
00082         if (!_limit) return;
00083 
00084         if (_limit) limitSize(_limit - 1);
00085 
00086         LibraryItem temp;
00087 
00088         temp.def = mov;
00089         temp.hitCount = 0;
00090 
00091         boost::mutex::scoped_lock lock(_mapMutex);
00092         _map[key] = temp;
00093     }
00094   
00095 
00096     void clear()
00097     {
00098         boost::mutex::scoped_lock lock(_mapMutex);
00099         _map.clear();
00100     }
00101   
00102 private:
00103 
00104     static bool findWorstHitCount(const LibraryContainer::value_type& a,
00105                                 const LibraryContainer::value_type& b)
00106     {
00107         return (a.second.hitCount < b.second.hitCount);
00108     }
00109 
00110     LibraryContainer _map;
00111     unsigned _limit;
00112 
00113     void limitSize(LibraryContainer::size_type max) {
00114 
00115         if (max < 1) {
00116             clear();
00117             return;
00118         }
00119 
00120         while (_map.size() > max) {
00121             boost::mutex::scoped_lock lock(_mapMutex);
00122             _map.erase(std::min_element(_map.begin(), _map.end(),
00123                         &findWorstHitCount));
00124         }
00125     
00126     }
00127 
00128         mutable boost::mutex _mapMutex;
00129   
00130 };
00131 
00132 }
00133 #endif 
00134 
00135 
00136 // Local Variables:
00137 // mode: C++
00138 // c-basic-offset: 8 
00139 // tab-width: 8
00140 // indent-tabs-mode: t
00141 // End: