SchedulingPolicy.java

/*******************************************************************************
 *
 *	Copyright (c) 2009 Fujitsu Services Ltd.
 *
 *	Author: Nick Battle
 *
 *	This file is part of VDMJ.
 *
 *	VDMJ 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 3 of the License, or
 *	(at your option) any later version.
 *
 *	VDMJ 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 VDMJ.  If not, see <http://www.gnu.org/licenses/>.
 *
 ******************************************************************************/

package org.overture.interpreter.scheduler;

import java.io.Serializable;

abstract public class SchedulingPolicy implements Serializable
{
	private static final long serialVersionUID = 1L;

	abstract public boolean reschedule();

	abstract public ISchedulableThread getThread();

	abstract public long getTimeslice();

	abstract public void register(ISchedulableThread thread, long priority);

	abstract public void unregister(ISchedulableThread thread);

	abstract public void reset();

	abstract public void advance();

	abstract public boolean hasActive();

	abstract public boolean hasPriorities();

	abstract public String getStatus();

	abstract public long timeToNextAlarm();

	public static SchedulingPolicy factory(String type)
	{
		if (type.equals("FP"))
		{
			return new FPPolicy();
		}

		return new FCFSPolicy(); // Default for everything!
	}
}