knode/knmemorymanager.cpp

   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 #include "knmemorymanager.h"
  16
  17 #include "knfolder.h"
  18 #include "knglobals.h"
  19 #include "knarticlemanager.h"
  20 #include "kngroupmanager.h"
  21 #include "knfoldermanager.h"
  22 #include "settings.h"
  23
  24 #include <KDebug>
  25
  26
  27 KNMemoryManager::KNMemoryManager()
  28   : c_ollCacheSize(0), a_rtCacheSize(0)
  29 {
  30 }
  31
  32
  33 KNMemoryManager::~KNMemoryManager()
  34 {
  35   qDeleteAll( mColList );
  36   qDeleteAll( mArtList );
  37 }
  38
  39
  40 void KNMemoryManager::updateCacheEntry( KNArticleCollection::Ptr c )
  41 {
  42   CollectionItem *ci;
  43   int oldSize=0;
  44
  45   if( (ci=findCacheEntry(c, true)) ) { // item is taken from the list
  46     oldSize=ci->storageSize;
  47     ci->sync();
  48     kDebug(5003) <<"KNMemoryManager::updateCacheEntry() : collection (" << c->name() <<") updated";
  49   }
  50   else {
  51     ci=new CollectionItem(c);
  52     kDebug(5003) <<"KNMemoryManager::updateCacheEntry() : collection (" << c->name() <<") added";
  53   }
  54
  55   mColList.append(ci);
  56   c_ollCacheSize += (ci->storageSize - oldSize);
  57   checkMemoryUsageCollections();
  58 }
  59
  60
  61 void KNMemoryManager::removeCacheEntry( KNArticleCollection::Ptr c )
  62 {
  63   CollectionItem *ci;
  64   ci=findCacheEntry(c, true);
  65
  66   if(ci) {
  67     c_ollCacheSize -= ci->storageSize;
  68     delete ci;
  69
  70     kDebug(5003) <<"KNMemoryManager::removeCacheEntry() : collection removed (" << c->name() <<"),"
  71                   << mColList.count() << "collections left in cache";
  72   }
  73 }
  74
  75
  76 void KNMemoryManager::prepareLoad( KNArticleCollection::Ptr c )
  77 {
  78   CollectionItem ci(c);
  79
  80   c_ollCacheSize += ci.storageSize;
  81   checkMemoryUsageCollections();
  82   c_ollCacheSize -= ci.storageSize;
  83 }
  84
  85
  86 void KNMemoryManager::updateCacheEntry( KNArticle::Ptr a )
  87 {
  88   ArticleItem *ai;
  89   int oldSize=0;
  90
  91   if( (ai=findCacheEntry(a, true)) ) {
  92     oldSize=ai->storageSize;
  93     ai->sync();
  94     kDebug(5003) <<"KNMemoryManager::updateCacheEntry() : article updated";
  95   }
  96   else {
  97     ai=new ArticleItem(a);
  98     kDebug(5003) <<"KNMemoryManager::updateCacheEntry() : article added";
  99   }
 100
 101   mArtList.append(ai);
 102   a_rtCacheSize += (ai->storageSize - oldSize);
 103   checkMemoryUsageArticles();
 104 }
 105
 106
 107 void KNMemoryManager::removeCacheEntry( KNArticle::Ptr a )
 108 {
 109   ArticleItem *ai;
 110
 111   if( (ai=findCacheEntry(a, true)) ) {
 112     a_rtCacheSize -= ai->storageSize;
 113     delete ai;
 114
 115     kDebug(5003) <<"KNMemoryManager::removeCacheEntry() : article removed,"
 116                   << mArtList.count() << "articles left in cache";
 117
 118   }
 119 }
 120
 121
 122 KNMemoryManager::CollectionItem * KNMemoryManager::findCacheEntry( KNArticleCollection::Ptr c, bool take )
 123 {
 124   for ( CollectionItem::List::Iterator it = mColList.begin(); it != mColList.end(); ++it ) {
 125     if ( (*it)->col == c ) {
 126       CollectionItem *ret = (*it);
 127       if ( take )
 128         mColList.erase( it );
 129       return ret;
 130     }
 131   }
 132
 133   return 0;
 134 }
 135
 136
 137 KNMemoryManager::ArticleItem* KNMemoryManager::findCacheEntry( KNArticle::Ptr a, bool take )
 138 {
 139   for ( ArticleItem::List::Iterator it = mArtList.begin(); it != mArtList.end(); ++it ) {
 140     if ( (*it)->art == a ) {
 141       ArticleItem *ret = (*it);
 142       if ( take )
 143         mArtList.erase( it );
 144       return ret;
 145     }
 146   }
 147
 148   return 0;
 149 }
 150
 151
 152 void KNMemoryManager::checkMemoryUsageCollections()
 153 {
 154   int maxSize = knGlobals.settings()->collCacheSize() * 1024;
 155   KNArticleCollection::Ptr c;
 156
 157   if (c_ollCacheSize > maxSize) {
 158     CollectionItem::List tempList( mColList ); // work on a copy, KNGroup-/Foldermanager will
 159                                                       // modify the original list
 160
 161     for ( CollectionItem::List::Iterator it = tempList.begin(); it != tempList.end(); ) {
 162       if ( c_ollCacheSize <= maxSize )
 163         break;
 164       // unloadHeaders() will remove the cache entry and thus invalidate the iterator!
 165       c = (*it)->col;
 166       ++it;
 167
 168       if (c->type() == KNCollection::CTgroup)
 169         knGlobals.groupManager()->unloadHeaders( boost::static_pointer_cast<KNGroup>( c ), false );   // *try* to unload
 170       else
 171         if (c->type() == KNCollection::CTfolder)
 172           knGlobals.folderManager()->unloadHeaders( boost::static_pointer_cast<KNFolder>( c ), false );   // *try* to unload
 173     }
 174   }
 175
 176   kDebug(5003) <<"KNMemoryManager::checkMemoryUsageCollections() :"
 177                 << mColList.count() << "collections in cache => Usage :"
 178                 << ( c_ollCacheSize*100.0 / maxSize ) << "%";
 179 }
 180
 181
 182 void KNMemoryManager::checkMemoryUsageArticles()
 183 {
 184   int maxSize = knGlobals.settings()->artCacheSize() * 1024;
 185
 186   if (a_rtCacheSize > maxSize) {
 187     ArticleItem::List tempList( mArtList ); // work on a copy, KNArticlemanager will
 188                                                    // modify the original list
 189
 190     for ( ArticleItem::List::Iterator it = mArtList.begin(); it != mArtList.end(); ) {
 191       if ( a_rtCacheSize <= maxSize )
 192         break;
 193       // unloadArticle() will remove the cache entry and thus invalidate the iterator!
 194       KNArticle::Ptr art = (*it)->art;
 195       ++it;
 196       knGlobals.articleManager()->unloadArticle( art, false );   // *try* to unload
 197     }
 198   }
 199
 200   kDebug(5003) <<"KNMemoryManager::checkMemoryUsageArticles() :"
 201                 << mArtList.count() << "articles in cache => Usage :"
 202                 << ( a_rtCacheSize*100.0 / maxSize ) << "%";
 203 }
 204
 205
 206 void KNMemoryManager::ArticleItem::sync()
 207 {
 208   storageSize=art->storageSize();
 209 }
 210
 211
 212 void KNMemoryManager::CollectionItem::sync()
 213 {
 214   storageSize=col->length()*1024; // rule of thumb : ~1k per header
 215 }
 216