DependencyPolicy.h

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/* -*- C++ -*-

   This file implements the DependencyPolicy class.

   $ Author: Mirko Boehm $
   $ Copyright: (C) 2004, 2005, 2006 Mirko Boehm $
   $ Contact: mirko@kde.org
         http://www.kde.org
         http://www.hackerbuero.org $

   This library is free software; you can redistribute it and/or
   modify it under the terms of the GNU Library General Public
   License as published by the Free Software Foundation; either
   version 2 of the License, or (at your option) any later version.

   This library 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
   Library General Public License for more details.

   You should have received a copy of the GNU Library General Public License
   along with this library; see the file COPYING.LIB.  If not, write to
   the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
   Boston, MA 02110-1301, USA.

   $Id: DebuggingAids.cpp 20 2005-08-08 21:02:51Z mirko $
*/

#ifndef DEPENDENCYPOLICY_H
#define DEPENDENCYPOLICY_H

template <typename T> class QList;

#include "QueuePolicy.h"

namespace ThreadWeaver {

    class THREADWEAVER_EXPORT DependencyPolicy : public QueuePolicy
    {
    public:
      ~DependencyPolicy();

        void addDependency( Job* jobA,  Job* jobB );

        bool removeDependency( Job* jobA, Job* jobB );

        void resolveDependencies ( Job* );

        QList<Job*> getDependencies( Job* ) const;

        // FIXME add factory method for singleton creation
        static DependencyPolicy& instance();

        bool canRun( Job* );

        void free( Job* );

        void release( Job* );

        void destructed( Job* );

    protected:
        bool hasUnresolvedDependencies( Job* ) const;

        DependencyPolicy();

    private:
        class Private;
        Private * const d;

    public:
        void dumpJobDependencies();
    };

}

#endif