knode/knmemorymanager.h

   1 /*
   2     KNode, the KDE newsreader
   3     Copyright (c) 1999-2005 the KNode authors.
   4     See file AUTHORS for details
   5
   6     This program is free software; you can redistribute it and/or modify
   7     it under the terms of the GNU General Public License as published by
   8     the Free Software Foundation; either version 2 of the License, or
   9     (at your option) any later version.
  10     You should have received a copy of the GNU General Public License
  11     along with this program; if not, write to the Free Software Foundation,
  12     Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, US
  13 */
  14
  15 #ifndef KNMEMORYMANAGER_H
  16 #define KNMEMORYMANAGER_H
  17
  18 #include "knarticle.h"
  19 #include "knarticlecollection.h"
  20
  21 #include <QList>
  22
  23 class KNArticleCollection;
  24
  25 /** Memory manager. */
  26 class KNMemoryManager {
  27
  28   public:
  29     KNMemoryManager();
  30     ~KNMemoryManager();
  31
  32     /** Collection-Handling */
  33     void updateCacheEntry( KNArticleCollection::Ptr c );
  34     void removeCacheEntry( KNArticleCollection::Ptr c );
  35     /** try to free enough memory for this collection */
  36     void prepareLoad( KNArticleCollection::Ptr c );
  37
  38     /** Article-Handling */
  39     void updateCacheEntry( KNArticle::Ptr a );
  40     void removeCacheEntry( KNArticle::Ptr a );
  41
  42   protected:
  43
  44     /** Article cache item. */
  45     class ArticleItem {
  46     public:
  47       explicit ArticleItem( KNArticle::Ptr a ) { art=a; sync(); }
  48       ~ArticleItem()            {}
  49       void sync();
  50
  51       KNArticle::Ptr art;
  52       int storageSize;
  53
  54       /// List of article cache items.
  55       typedef QList<KNMemoryManager::ArticleItem*> List;
  56     };
  57
  58     /** Group/folder cache item. */
  59     class CollectionItem {
  60     public:
  61       explicit CollectionItem( KNArticleCollection::Ptr c )
  62       {
  63         col = c;
  64         sync();
  65       }
  66       ~CollectionItem()                      { }
  67       void sync();
  68
  69       KNArticleCollection::Ptr col;
  70       int storageSize;
  71
  72       /// List of collection cache items.
  73       typedef QList<KNMemoryManager::CollectionItem*> List;
  74     };
  75
  76     CollectionItem * findCacheEntry( KNArticleCollection::Ptr c, bool take = false );
  77     ArticleItem * findCacheEntry( KNArticle::Ptr a, bool take = false );
  78     void checkMemoryUsageCollections();
  79     void checkMemoryUsageArticles();
  80
  81     CollectionItem::List mColList;
  82     ArticleItem::List mArtList;
  83     int c_ollCacheSize, a_rtCacheSize;
  84 };
  85
  86
  87 #endif