Copy the KDE 3.5 branch to branches/trinity for new KDE 3.5 features.

BUG:215923


git-svn-id: svn://anonsvn.kde.org/home/kde/branches/trinity/kdepim@1054174 283d02a7-25f6-0310-bc7c-ecb5cbfe19da

1 files changed, 217 insertions, 0 deletions

diff --git a/knode/knmemorymanager.cpp b/knode/knmemorymanager.cpp
new file mode 100644
index 000000000..283bcf546
--- /dev/null
+++ b/knode/knmemorymanager.cpp
@@ -0,0 +1,217 @@
+/*
+    KNode, the KDE newsreader
+    Copyright (c) 1999-2005 the KNode authors.
+    See file AUTHORS for details
+
+    This program is free software; you can redistribute it and/or modify
+    it under the terms of the GNU General Public License as published by
+    the Free Software Foundation; either version 2 of the License, or
+    (at your option) any later version.
+    You should have received a copy of the GNU General Public License
+    along with this program; if not, write to the Free Software Foundation,
+    Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, US
+*/
+
+#include <kdebug.h>
+
+#include "knmemorymanager.h"
+#include "knfolder.h"
+#include "knglobals.h"
+#include "knconfigmanager.h"
+#include "knarticlemanager.h"
+#include "kngroupmanager.h"
+#include "knfoldermanager.h"
+
+
+KNMemoryManager::KNMemoryManager()
+  : c_ollCacheSize(0), a_rtCacheSize(0)
+{
+}
+
+
+KNMemoryManager::~KNMemoryManager()
+{
+  for ( QValueList<CollectionItem*>::Iterator it = mColList.begin(); it != mColList.end(); ++it )
+    delete (*it);
+  for ( QValueList<ArticleItem*>::Iterator it = mArtList.begin(); it != mArtList.end(); ++it )
+    delete (*it);
+}
+
+
+void KNMemoryManager::updateCacheEntry(KNArticleCollection *c)
+{
+  CollectionItem *ci;
+  int oldSize=0;
+
+  if( (ci=findCacheEntry(c, true)) ) { // item is taken from the list
+    oldSize=ci->storageSize;
+    ci->sync();
+    kdDebug(5003) << "KNMemoryManager::updateCacheEntry() : collection (" << c->name() << ") updated" << endl;
+  }
+  else {
+    ci=new CollectionItem(c);
+    kdDebug(5003) << "KNMemoryManager::updateCacheEntry() : collection (" << c->name() << ") added" << endl;
+  }
+
+  mColList.append(ci);
+  c_ollCacheSize += (ci->storageSize - oldSize);
+  checkMemoryUsageCollections();
+}
+
+
+void KNMemoryManager::removeCacheEntry(KNArticleCollection *c)
+{
+  CollectionItem *ci;
+  ci=findCacheEntry(c, true);
+
+  if(ci) {
+    c_ollCacheSize -= ci->storageSize;
+    delete ci;
+
+    kdDebug(5003) << "KNMemoryManager::removeCacheEntry() : collection removed (" << c->name() << "), "
+                  << mColList.count() << " collections left in cache" << endl;
+  }
+}
+
+
+void KNMemoryManager::prepareLoad(KNArticleCollection *c)
+{
+  CollectionItem ci(c);
+
+  c_ollCacheSize += ci.storageSize;
+  checkMemoryUsageCollections();
+  c_ollCacheSize -= ci.storageSize;
+}
+
+
+void KNMemoryManager::updateCacheEntry(KNArticle *a)
+{
+  ArticleItem *ai;
+  int oldSize=0;
+
+  if( (ai=findCacheEntry(a, true)) ) {
+    oldSize=ai->storageSize;
+    ai->sync();
+    kdDebug(5003) << "KNMemoryManager::updateCacheEntry() : article updated" << endl;
+  }
+  else {
+    ai=new ArticleItem(a);
+    kdDebug(5003) << "KNMemoryManager::updateCacheEntry() : article added" << endl;
+  }
+
+  mArtList.append(ai);
+  a_rtCacheSize += (ai->storageSize - oldSize);
+  checkMemoryUsageArticles();
+}
+
+
+void KNMemoryManager::removeCacheEntry(KNArticle *a)
+{
+  ArticleItem *ai;
+
+  if( (ai=findCacheEntry(a, true)) ) {
+    a_rtCacheSize -= ai->storageSize;
+    delete ai;
+
+    kdDebug(5003) << "KNMemoryManager::removeCacheEntry() : article removed, "
+                  << mArtList.count() << " articles left in cache" << endl;
+
+  }
+}
+
+
+KNMemoryManager::CollectionItem* KNMemoryManager::findCacheEntry(KNArticleCollection *c, bool take)
+{
+  for ( QValueList<CollectionItem*>::Iterator it = mColList.begin(); it != mColList.end(); ++it ) {
+    if ( (*it)->col == c ) {
+      CollectionItem *ret = (*it);
+      if ( take )
+        mColList.remove( it );
+      return ret;
+    }
+  }
+
+  return 0;
+}
+
+
+KNMemoryManager::ArticleItem* KNMemoryManager::findCacheEntry(KNArticle *a, bool take)
+{
+  for ( QValueList<ArticleItem*>::Iterator it = mArtList.begin(); it != mArtList.end(); ++it ) {
+    if ( (*it)->art == a ) {
+      ArticleItem *ret = (*it);
+      if ( take )
+        mArtList.remove( it );
+      return ret;
+    }
+  }
+
+  return 0;
+}
+
+
+void KNMemoryManager::checkMemoryUsageCollections()
+{
+  int maxSize = knGlobals.configManager()->readNewsGeneral()->collCacheSize() * 1024;
+  KNArticleCollection *c=0;
+
+  if (c_ollCacheSize > maxSize) {
+    QValueList<CollectionItem*> tempList( mColList ); // work on a copy, KNGroup-/Foldermanager will
+                                                      // modify the original list
+
+    for ( QValueList<CollectionItem*>::Iterator it = tempList.begin(); it != tempList.end(); ) {
+      if ( c_ollCacheSize <= maxSize )
+        break;
+      // unloadHeaders() will remove the cache entry and thus invalidate the iterator!
+      c = (*it)->col;
+      ++it;
+
+      if (c->type() == KNCollection::CTgroup)
+        knGlobals.groupManager()->unloadHeaders(static_cast<KNGroup*>(c), false);   // *try* to unload
+      else
+        if (c->type() == KNCollection::CTfolder)
+          knGlobals.folderManager()->unloadHeaders(static_cast<KNFolder*>(c), false);   // *try* to unload
+    }
+  }
+
+  kdDebug(5003) << "KNMemoryManager::checkMemoryUsageCollections() : "
+                << mColList.count() << " collections in cache => Usage : "
+                << ( c_ollCacheSize*100.0 / maxSize ) << "%" << endl;
+}
+
+
+void KNMemoryManager::checkMemoryUsageArticles()
+{
+  int maxSize = knGlobals.configManager()->readNewsGeneral()->artCacheSize() * 1024;
+
+  if (a_rtCacheSize > maxSize) {
+    QValueList<ArticleItem*> tempList( mArtList ); // work on a copy, KNArticlemanager will
+                                                   // modify the original list
+
+    for ( QValueList<ArticleItem*>::Iterator it = mArtList.begin(); it != mArtList.end(); ) {
+      if ( a_rtCacheSize <= maxSize )
+        break;
+      // unloadArticle() will remove the cache entry and thus invalidate the iterator!
+      KNArticle *art = (*it)->art;
+      ++it;
+      knGlobals.articleManager()->unloadArticle( art, false );   // *try* to unload
+    }
+  }
+
+  kdDebug(5003) << "KNMemoryManager::checkMemoryUsageArticles() : "
+                << mArtList.count() << " articles in cache => Usage : "
+                << ( a_rtCacheSize*100.0 / maxSize ) << "%" << endl;
+}
+
+
+void KNMemoryManager::ArticleItem::sync()
+{
+  storageSize=art->storageSize();
+}
+
+
+void KNMemoryManager::CollectionItem::sync()
+{
+  storageSize=col->length()*1024; // rule of thumb : ~1k per header
+}
+