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JAva SImulatior for MAnufacturing and logistics - A framework for discrete event simulation and computer experiments with a main focus on modelling and analyzing logistic/manufacturing systems.

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/*******************************************************************************
 * Copyright (c) 2010-2013 Torsten Hildebrandt and jasima contributors
 *
 * This file is part of jasima, v1.0.
 *
 * jasima 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.
 *
 * jasima 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 jasima.  If not, see .
 *
 * $Id: MMS.java 73 2013-01-08 17:16:19Z [email protected] $
 *******************************************************************************/
package jasima.shopSim.prioRules.setup;

import jasima.shopSim.core.PR;
import jasima.shopSim.core.PrioRuleTarget;
import jasima.shopSim.core.PriorityQueue;

import java.util.HashMap;
import java.util.Map;

/**
 * This class implements the Minimum Marginal Setup time rule, developed by Arzi
 * and Raviv (1998), which assigns highest priority to all jobs that belong to
 * the family with the shortest setup time per job, see also Pickardt and Branke
 * (2012).
 * 
 * This rule should be used with another rule to distinguish jobs of the
 * selected family.
 * 
 * @author Christoph Pickardt, 2011-11-15
 * @version $Id: MMS.java 73 2013-01-08 17:16:19Z [email protected] $
 */
public class MMS extends PR {

	protected Map jobsPerFamily = new HashMap();

	@Override
	public void beforeCalc(PriorityQueue q) {
		jobsPerFamily.clear();
		assert jobsPerFamily.isEmpty();
		for (int i = 0; i < q.size(); i++) {
			PrioRuleTarget j = q.get(i);

			if (arrivesTooLate(j))
				continue;

			String sf = "" + j.getCurrentOperation().setupState;
			if (jobsPerFamily.get(sf) == null) {
				jobsPerFamily.put(sf, 1);
			} else {
				int familyValue = jobsPerFamily.get(sf) + 1;
				jobsPerFamily.put(sf, familyValue);
			}
		}

		super.beforeCalc(q);
	}

	@Override
	public double calcPrio(PrioRuleTarget j) {
		if (arrivesTooLate(j))
			return PriorityQueue.MIN_PRIO;

		double marginalSetup = getOwner().getSetupMatrix()[getOwner().currMachine.setupState][j
				.getCurrentOperation().setupState]
				/ jobsPerFamily.get("" + j.getCurrentOperation().setupState);

		return -marginalSetup;
	}

}