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/*
This file is part of Akregator.
Copyright (C) 2004 Sashmit Bhaduri <smt@vfemail.net>
2005 Frank Osterfeld <frank.osterfeld at kdemail.net>
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.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
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, USA.
As a special exception, permission is given to link this program
with any edition of TQt, and distribute the resulting executable,
without including the source code for TQt in the source distribution.
*/
#include <tqvaluelist.h>
#include "akregatorconfig.h"
#include "fetchqueue.h"
#include "feed.h"
#include "treenode.h"
namespace Akregator {
class FetchQueue::FetchQueuePrivate
{
public:
TQValueList<Feed*> queuedFeeds;
TQValueList<Feed*> fetchingFeeds;
};
FetchQueue::FetchQueue(TQObject* tqparent, const char* name): TQObject(tqparent, name), d(new FetchQueuePrivate) {}
FetchQueue::~FetchQueue()
{
slotAbort();
delete d;
d = 0;
}
void FetchQueue::slotAbort()
{
for (TQValueList<Feed*>::Iterator it = d->fetchingFeeds.begin(); it != d->fetchingFeeds.end(); ++it)
{
disconnectFromFeed(*it);
(*it)->slotAbortFetch();
}
d->fetchingFeeds.clear();
for (TQValueList<Feed*>::Iterator it = d->queuedFeeds.begin(); it != d->queuedFeeds.end(); ++it)
{
disconnectFromFeed(*it);
}
d->queuedFeeds.clear();
emit signalStopped();
}
void FetchQueue::addFeed(Feed *f)
{
if (!d->queuedFeeds.contains(f) && !d->fetchingFeeds.contains(f))
{
connectToFeed(f);
d->queuedFeeds.append(f);
fetchNextFeed();
}
}
void FetchQueue::fetchNextFeed()
{
if (!d->queuedFeeds.isEmpty() && d->fetchingFeeds.count() < Settings::concurrentFetches())
{
if (d->fetchingFeeds.isEmpty() && d->queuedFeeds.count() == 1)
emit signalStarted();
Feed* f = *(d->queuedFeeds.begin());
d->queuedFeeds.pop_front();
d->fetchingFeeds.append(f);
f->fetch(false);
}
}
void FetchQueue::slotFeedFetched(Feed *f)
{
emit fetched(f);
feedDone(f);
}
void FetchQueue::slotFetchError(Feed *f)
{
emit fetchError(f);
feedDone(f);
}
void FetchQueue::slotFetchAborted(Feed *f)
{
emit fetched(f); // FIXME: better use a signal like signalAborted(Feed*)
feedDone(f);
}
bool FetchQueue::isEmpty() const
{
return d->queuedFeeds.isEmpty() && d->fetchingFeeds.isEmpty();
}
void FetchQueue::feedDone(Feed *f)
{
disconnectFromFeed(f);
d->fetchingFeeds.remove(f);
if (isEmpty())
emit signalStopped();
else
fetchNextFeed();
}
void FetchQueue::connectToFeed(Feed* feed)
{
connect (feed, TQT_SIGNAL(fetched(Feed*)), this, TQT_SLOT(slotFeedFetched(Feed*)));
connect (feed, TQT_SIGNAL(fetchError(Feed*)), this, TQT_SLOT(slotFetchError(Feed*)));
connect (feed, TQT_SIGNAL(fetchAborted(Feed*)), this, TQT_SLOT(slotFetchAborted(Feed*)));
connect (feed, TQT_SIGNAL(signalDestroyed(TreeNode*)), this, TQT_SLOT(slotNodeDestroyed(TreeNode*)));
}
void FetchQueue::disconnectFromFeed(Feed* feed)
{
disconnect (feed, TQT_SIGNAL(fetched(Feed*)), this, TQT_SLOT(slotFeedFetched(Feed*)));
disconnect (feed, TQT_SIGNAL(fetchError(Feed*)), this, TQT_SLOT(slotFetchError(Feed*)));
disconnect (feed, TQT_SIGNAL(fetchAborted(Feed*)), this, TQT_SLOT(slotFetchAborted(Feed*)));
disconnect (feed, TQT_SIGNAL(signalDestroyed(TreeNode*)), this, TQT_SLOT(slotNodeDestroyed(TreeNode*)));
}
void FetchQueue::slotNodeDestroyed(TreeNode* node)
{
Feed* feed = dynamic_cast<Feed*> (node);
if (feed)
{
d->fetchingFeeds.remove(feed);
d->queuedFeeds.remove(feed);
}
}
} // namespace Akregator
#include "fetchqueue.moc"
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