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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.
*/
#ifndef AKREGATOR_FETCHQUEUE_H
#define AKREGATOR_FETCHQUEUE_H
#include <tqobject.h>
namespace Akregator {
class Feed;
class TreeNode;
class FetchQueue : public TQObject
{
    Q_OBJECT
  
    public:
        FetchQueue(TQObject* parent=0, const char* name=0);
        virtual ~FetchQueue();
        /** returns true when no feeds are neither fetching nor queued */
        bool isEmpty() const;
        
        /** adds a feed to the queue */
        void addFeed(Feed *f);
    public slots:
    
        /** aborts currently fetching feeds and empties the queue */
        void slotAbort();
        
    signals:
        void signalStarted();
        void signalStopped();
        void fetched(Feed*);
        void fetchError(Feed*);
    protected: 
        /** fetches the next feed in the queue, unless the maximum of concurrent fetches is reached */
        void fetchNextFeed();
        
        void feedDone(Feed *f);
        void connectToFeed(Feed* feed);
        void disconnectFromFeed(Feed* feed);
    protected slots:
        
        void slotNodeDestroyed(TreeNode* node);
        void slotFeedFetched(Feed *);
        void slotFetchError(Feed *);
        void slotFetchAborted(Feed *);
        
    private:
        class FetchQueuePrivate;
        FetchQueuePrivate* d;
};
} // namespace Akregator
#endif
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