/******************************************************************************
 * Icinga 2                                                                   *
 * Copyright (C) 2012-2018 Icinga Development Team (https://icinga.com/)      *
 *                                                                            *
 * 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 St, Fifth Floor, Boston, MA 02110-1301, USA.             *
 ******************************************************************************/

#ifndef DEPENDENCYGRAPH_H
#define DEPENDENCYGRAPH_H

#include "base/i2-base.hpp"
#include "base/object.hpp"
#include <boost/thread/mutex.hpp>
#include <map>

namespace icinga {

/**
 * A graph that tracks dependencies between objects.
 *
 * @ingroup base
 */
class DependencyGraph
{
public:
	static void AddDependency(Object *parent, Object *child);
	static void RemoveDependency(Object *parent, Object *child);
	static std::vector<Object::Ptr> GetParents(const Object::Ptr& child);

private:
	DependencyGraph();

	static boost::mutex m_Mutex;
	static std::map<Object *, std::map<Object *, int> > m_Dependencies;
};

}

#endif /* DEPENDENCYGRAPH_H */