org.optaplanner.examples.cloudbalancing.swingui.realtime.DeleteComputerProblemChange Maven / Gradle / Ivy

Go to download

Show more of this group Show more artifacts with this name
Show all versions of optaplanner-examples Show documentation

OptaPlanner solves planning problems. This lightweight, embeddable planning engine implements powerful and scalable algorithms to optimize business resource scheduling and planning. This module contains the examples which demonstrate how to use it in a normal Java application.

There is a newer version: 9.44.0.Final

Show newest version

package org.optaplanner.examples.cloudbalancing.swingui.realtime;

import java.util.ArrayList;

import org.optaplanner.core.api.solver.change.ProblemChange;
import org.optaplanner.core.api.solver.change.ProblemChangeDirector;
import org.optaplanner.examples.cloudbalancing.domain.CloudBalance;
import org.optaplanner.examples.cloudbalancing.domain.CloudComputer;
import org.optaplanner.examples.cloudbalancing.domain.CloudProcess;

public class DeleteComputerProblemChange implements ProblemChange {

    private final CloudComputer computer;

    public DeleteComputerProblemChange(CloudComputer computer) {
        this.computer = computer;
    }

    @Override
    public void doChange(CloudBalance cloudBalance, ProblemChangeDirector problemChangeDirector) {
        problemChangeDirector.lookUpWorkingObject(computer)
                .ifPresentOrElse(workingComputer -> {
                    // First remove the problem fact from all planning entities that use it
                    for (CloudProcess process : cloudBalance.getProcessList()) {
                        if (process.getComputer() == workingComputer) {
                            problemChangeDirector.changeVariable(process, "computer",
                                    workingProcess -> workingProcess.setComputer(null));
                        }
                    }
                    // A SolutionCloner does not clone problem fact lists (such as computerList)
                    // Shallow clone the computerList so only workingSolution is affected, not bestSolution or guiSolution
                    ArrayList computerList = new ArrayList<>(cloudBalance.getComputerList());
                    cloudBalance.setComputerList(computerList);
                    // Remove the problem fact itself
                    problemChangeDirector.removeProblemFact(workingComputer, computerList::remove);
                }, () -> {
                    // The computer has already been deleted (the UI asked to changed the same computer twice).
                });
    }

}