fetchqueue.cpp
00001 /* 00002 This file is part of Akregator. 00003 00004 Copyright (C) 2004 Sashmit Bhaduri <smt@vfemail.net> 00005 2005 Frank Osterfeld <frank.osterfeld at kdemail.net> 00006 00007 This program is free software; you can redistribute it and/or modify 00008 it under the terms of the GNU General Public License as published by 00009 the Free Software Foundation; either version 2 of the License, or 00010 (at your option) any later version. 00011 00012 This program is distributed in the hope that it will be useful, 00013 but WITHOUT ANY WARRANTY; without even the implied warranty of 00014 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 00015 GNU General Public License for more details. 00016 00017 You should have received a copy of the GNU General Public License 00018 along with this program; if not, write to the Free Software 00019 Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. 00020 00021 As a special exception, permission is given to link this program 00022 with any edition of TQt, and distribute the resulting executable, 00023 without including the source code for TQt in the source distribution. 00024 */ 00025 00026 #include <tqvaluelist.h> 00027 00028 #include "akregatorconfig.h" 00029 #include "fetchqueue.h" 00030 #include "feed.h" 00031 #include "treenode.h" 00032 00033 00034 namespace Akregator { 00035 00036 class FetchQueue::FetchQueuePrivate 00037 { 00038 public: 00039 00040 TQValueList<Feed*> queuedFeeds; 00041 TQValueList<Feed*> fetchingFeeds; 00042 }; 00043 00044 00045 FetchQueue::FetchQueue(TQObject* parent, const char* name): TQObject(parent, name), d(new FetchQueuePrivate) {} 00046 00047 00048 FetchQueue::~FetchQueue() 00049 { 00050 slotAbort(); 00051 delete d; 00052 d = 0; 00053 } 00054 00055 void FetchQueue::slotAbort() 00056 { 00057 for (TQValueList<Feed*>::Iterator it = d->fetchingFeeds.begin(); it != d->fetchingFeeds.end(); ++it) 00058 { 00059 disconnectFromFeed(*it); 00060 (*it)->slotAbortFetch(); 00061 } 00062 d->fetchingFeeds.clear(); 00063 00064 for (TQValueList<Feed*>::Iterator it = d->queuedFeeds.begin(); it != d->queuedFeeds.end(); ++it) 00065 { 00066 disconnectFromFeed(*it); 00067 } 00068 d->queuedFeeds.clear(); 00069 00070 emit signalStopped(); 00071 } 00072 00073 void FetchQueue::addFeed(Feed *f) 00074 { 00075 if (!d->queuedFeeds.contains(f) && !d->fetchingFeeds.contains(f)) 00076 { 00077 connectToFeed(f); 00078 d->queuedFeeds.append(f); 00079 fetchNextFeed(); 00080 } 00081 } 00082 00083 void FetchQueue::fetchNextFeed() 00084 { 00085 if (!d->queuedFeeds.isEmpty() && d->fetchingFeeds.count() < Settings::concurrentFetches()) 00086 { 00087 if (d->fetchingFeeds.isEmpty() && d->queuedFeeds.count() == 1) 00088 emit signalStarted(); 00089 Feed* f = *(d->queuedFeeds.begin()); 00090 d->queuedFeeds.pop_front(); 00091 d->fetchingFeeds.append(f); 00092 f->fetch(false); 00093 00094 } 00095 } 00096 00097 void FetchQueue::slotFeedFetched(Feed *f) 00098 { 00099 emit fetched(f); 00100 feedDone(f); 00101 } 00102 00103 void FetchQueue::slotFetchError(Feed *f) 00104 { 00105 emit fetchError(f); 00106 feedDone(f); 00107 } 00108 00109 void FetchQueue::slotFetchAborted(Feed *f) 00110 { 00111 emit fetched(f); // FIXME: better use a signal like signalAborted(Feed*) 00112 feedDone(f); 00113 } 00114 00115 bool FetchQueue::isEmpty() const 00116 { 00117 return d->queuedFeeds.isEmpty() && d->fetchingFeeds.isEmpty(); 00118 } 00119 00120 void FetchQueue::feedDone(Feed *f) 00121 { 00122 disconnectFromFeed(f); 00123 d->fetchingFeeds.remove(f); 00124 if (isEmpty()) 00125 emit signalStopped(); 00126 else 00127 fetchNextFeed(); 00128 } 00129 00130 void FetchQueue::connectToFeed(Feed* feed) 00131 { 00132 connect (feed, TQT_SIGNAL(fetched(Feed*)), this, TQT_SLOT(slotFeedFetched(Feed*))); 00133 connect (feed, TQT_SIGNAL(fetchError(Feed*)), this, TQT_SLOT(slotFetchError(Feed*))); 00134 connect (feed, TQT_SIGNAL(fetchAborted(Feed*)), this, TQT_SLOT(slotFetchAborted(Feed*))); 00135 connect (feed, TQT_SIGNAL(signalDestroyed(TreeNode*)), this, TQT_SLOT(slotNodeDestroyed(TreeNode*))); 00136 } 00137 00138 void FetchQueue::disconnectFromFeed(Feed* feed) 00139 { 00140 disconnect (feed, TQT_SIGNAL(fetched(Feed*)), this, TQT_SLOT(slotFeedFetched(Feed*))); 00141 disconnect (feed, TQT_SIGNAL(fetchError(Feed*)), this, TQT_SLOT(slotFetchError(Feed*))); 00142 disconnect (feed, TQT_SIGNAL(fetchAborted(Feed*)), this, TQT_SLOT(slotFetchAborted(Feed*))); 00143 disconnect (feed, TQT_SIGNAL(signalDestroyed(TreeNode*)), this, TQT_SLOT(slotNodeDestroyed(TreeNode*))); 00144 } 00145 00146 00147 void FetchQueue::slotNodeDestroyed(TreeNode* node) 00148 { 00149 Feed* feed = dynamic_cast<Feed*> (node); 00150 00151 if (feed) 00152 { 00153 d->fetchingFeeds.remove(feed); 00154 d->queuedFeeds.remove(feed); 00155 } 00156 } 00157 00158 } // namespace Akregator 00159 00160 #include "fetchqueue.moc"