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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.
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package org.optaplanner.examples.machinereassignment.swingui;

import java.awt.GridLayout;
import java.util.ArrayList;
import java.util.Collections;
import java.util.LinkedHashMap;
import java.util.LinkedHashSet;
import java.util.List;
import java.util.Map;
import java.util.Set;

import javax.swing.GroupLayout;
import javax.swing.JLabel;
import javax.swing.JPanel;

import org.optaplanner.examples.common.swingui.SolutionPanel;
import org.optaplanner.examples.machinereassignment.domain.MachineReassignment;
import org.optaplanner.examples.machinereassignment.domain.MrMachine;
import org.optaplanner.examples.machinereassignment.domain.MrProcessAssignment;
import org.optaplanner.examples.machinereassignment.domain.MrResource;

public class MachineReassignmentPanel extends SolutionPanel {

    public static final String LOGO_PATH = "/org/optaplanner/examples/machinereassignment/swingui/machineReassignmentLogo.png";

    private JPanel machineListPanel;

    private MrMachinePanel unassignedPanel;
    private JLabel tooBigLabel = null;
    private Map machineToPanelMap;

    public MachineReassignmentPanel() {
        GroupLayout layout = new GroupLayout(this);
        setLayout(layout);
        createMachineListPanel();
        JPanel headerPanel = new JPanel();
        layout.setHorizontalGroup(layout.createParallelGroup()
                .addComponent(headerPanel).addComponent(machineListPanel));
        layout.setVerticalGroup(layout.createSequentialGroup()
                .addComponent(headerPanel, GroupLayout.PREFERRED_SIZE, GroupLayout.PREFERRED_SIZE,
                        GroupLayout.PREFERRED_SIZE)
                .addComponent(machineListPanel, GroupLayout.PREFERRED_SIZE, GroupLayout.PREFERRED_SIZE,
                        GroupLayout.PREFERRED_SIZE));
    }

    private void createMachineListPanel() {
        machineListPanel = new JPanel(new GridLayout(0, 1));
        unassignedPanel = new MrMachinePanel(this, Collections.emptyList(), null);
        machineListPanel.add(unassignedPanel);
        machineToPanelMap = new LinkedHashMap<>();
        machineToPanelMap.put(null, unassignedPanel);
    }

    @Override
    public void resetPanel(MachineReassignment machineReassignment) {
        for (MrMachinePanel machinePanel : machineToPanelMap.values()) {
            if (machinePanel.getMachine() != null) {
                machineListPanel.remove(machinePanel);
            }
        }
        machineToPanelMap.clear();
        machineToPanelMap.put(null, unassignedPanel);
        unassignedPanel.clearProcessAssignments();
        updatePanel(machineReassignment);
    }

    @Override
    public void updatePanel(MachineReassignment machineReassignment) {
        List resourceList = machineReassignment.getResourceList();
        unassignedPanel.setResourceList(resourceList);
        if (machineReassignment.getMachineList().size() > 1000) {
            if (tooBigLabel == null) {
                tooBigLabel = new JLabel("The dataset is too big to show.");
                machineListPanel.add(tooBigLabel);
            }
        } else {
            if (tooBigLabel != null) {
                machineListPanel.remove(tooBigLabel);
                tooBigLabel = null;
            }
            Set deadMachineSet = new LinkedHashSet<>(machineToPanelMap.keySet());
            deadMachineSet.remove(null);
            for (MrMachine machine : machineReassignment.getMachineList()) {
                deadMachineSet.remove(machine);
                MrMachinePanel machinePanel = machineToPanelMap.get(machine);
                if (machinePanel == null) {
                    machinePanel = new MrMachinePanel(this, resourceList, machine);
                    machineListPanel.add(machinePanel);
                    machineToPanelMap.put(machine, machinePanel);
                }
                machinePanel.clearProcessAssignments();
            }
            unassignedPanel.clearProcessAssignments();
            for (MrProcessAssignment processAssignment : machineReassignment.getProcessAssignmentList()) {
                MrMachine machine = processAssignment.getMachine();
                MrMachinePanel machinePanel = machineToPanelMap.get(machine);
                machinePanel.addProcessAssignment(processAssignment);
            }
            for (MrMachine deadMachine : deadMachineSet) {
                MrMachinePanel deadMachinePanel = machineToPanelMap.remove(deadMachine);
                machineListPanel.remove(deadMachinePanel);
            }
            for (MrMachinePanel machinePanel : machineToPanelMap.values()) {
                machinePanel.update();
            }
        }
    }

    public void deleteMachine(final MrMachine machine) {
        logger.info("Scheduling delete of machine ({}).", machine);
        doProblemChange((machineReassignment, problemChangeDirector) -> problemChangeDirector.lookUpWorkingObject(machine)
                .ifPresentOrElse(workingMachine -> {
                    // First remove the problem fact from all planning entities that use it
                    for (MrProcessAssignment processAssignment : machineReassignment.getProcessAssignmentList()) {
                        if (processAssignment.getOriginalMachine() == workingMachine) {
                            problemChangeDirector.changeProblemProperty(processAssignment,
                                    workingProcessAssignment -> workingProcessAssignment.setOriginalMachine(null));
                        }
                        if (processAssignment.getMachine() == workingMachine) {
                            problemChangeDirector.changeVariable(processAssignment, "machine",
                                    workingProcessAssignment -> workingProcessAssignment.setMachine(null));
                        }
                    }
                    // A SolutionCloner does not clone problem fact lists (such as machineList)
                    // Shallow clone the machineList so only workingSolution is affected, not bestSolution or guiSolution
                    ArrayList machineList = new ArrayList<>(machineReassignment.getMachineList());
                    machineReassignment.setMachineList(machineList);
                    // Remove it the problem fact itself
                    problemChangeDirector.removeProblemFact(workingMachine, machineList::remove);
                }, () -> logger.info("Skipping problem change due to machine ({}) already deleted.", machine)));
    }

}