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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: WINQ.java 73 2013-01-08 17:16:19Z [email protected] $
 *******************************************************************************/
package jasima.shopSim.prioRules.upDownStream;

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

/**
 * The class implements the Least Work content In Next Queue rule, see Haupt
 * (1989). The current work content at the work centre which a job visits for
 * its next operation defines the priority of a job. For its last operation, the
 * work content in the next queue of a job is zero.
 * 
 * @author Torsten Hildebrandt
 * @version $Id: WINQ.java 73 2013-01-08 17:16:19Z [email protected] $
 */
public class WINQ extends PR {

	@Override
	public double calcPrio(PrioRuleTarget job) {
		return -winq(job);
	}

	/**
	 * Computes the work in next queue of the jobs currently waiting in front of
	 * the next machine, i.e. without future jobs.
	 * 
	 * 
	 * @see XWINQ#xwinq(PrioRuleTarget)
	 */
	public static double winq(PrioRuleTarget job) {
		int nextTask = job.getTaskNumber() + 1;
		if (nextTask >= job.numOps())
			return 0;

		WorkStation mNext = job.getOps()[nextTask].machine;
		return mNext.workContent(false);
	}

}