jasima.shopSim.prioRules.basic.SI Maven / Gradle / Ivy
/*******************************************************************************
* This file is part of jasima, v1.3, the Java simulator for manufacturing and
* logistics.
*
* Copyright (c) 2015 jasima solutions UG
* Copyright (c) 2010-2015 Torsten Hildebrandt and jasima contributors
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License as published by
* the Free Software Foundation, either version 3 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 Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with this program. If not, see .
*******************************************************************************/
package jasima.shopSim.prioRules.basic;
import jasima.shopSim.core.PR;
import jasima.shopSim.core.PrioRuleTarget;
/**
* This rule implements a truncated version of SPT, often referred to as SI^x,
* see e.g. Blackstone (1982). The SI^x rule first distinguishes between jobs
* with positive and negative slack with the latter group receiving priority.
* Jobs within a group are sequenced according to SPT.
*
* @author Christoph Pickardt, 2011-11-15
* @version "$Id: SI.java 753 2015-07-27 15:29:49Z [email protected] $"
*/
public class SI extends PR {
private static final long serialVersionUID = 8008779098412019655L;
public SI() {
super();
super.setTieBreaker(new SPT());
}
@Override
public double calcPrio(PrioRuleTarget j) {
if ((j.getDueDate() - j.getShop().simTime() - j.remainingProcTime()) <= 0)
return +1;
else
return -1;
}
@Override
public void setTieBreaker(PR tieBreaker) {
if (getTieBreaker() != null) {
getTieBreaker().setTieBreaker(tieBreaker);
} else
super.setTieBreaker(tieBreaker);
}
@Override
public String getName() {
return "SI";
}
}