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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.conferencescheduling.swingui;

import java.awt.BorderLayout;
import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;
import java.util.concurrent.ExecutionException;
import java.util.function.BiConsumer;

import javax.swing.BorderFactory;
import javax.swing.JButton;
import javax.swing.JComboBox;
import javax.swing.JDialog;
import javax.swing.JLabel;
import javax.swing.JOptionPane;
import javax.swing.JPanel;
import javax.swing.JProgressBar;
import javax.swing.JTextField;
import javax.swing.SwingConstants;
import javax.swing.SwingWorker;
import javax.swing.WindowConstants;

import org.optaplanner.examples.common.app.CommonApp;
import org.optaplanner.examples.common.business.SolutionBusiness;
import org.optaplanner.examples.common.swingui.SolutionPanel;
import org.optaplanner.examples.conferencescheduling.domain.ConferenceSolution;
import org.optaplanner.examples.conferencescheduling.persistence.ConferenceSchedulingCfpDevoxxImporter;

public class ConferenceCFPImportAction implements CommonApp.ExtraAction {

    @Override
    public String getName() {
        return "Import from CFP";
    }

    @Override
    public BiConsumer, SolutionPanel> getConsumer() {
        return (solutionBusiness, solutionPanel) -> {
            String[] cfpArray = { "cfp-devoxx" };
            JComboBox cfpConferenceBox = new JComboBox<>(cfpArray);
            JTextField cfpRestUrlTextField = new JTextField("https://dvbe18.confinabox.com/api/conferences/DVBE18");
            Object[] dialogue = {
                    "Choose conference:", cfpConferenceBox,
                    "Enter CFP REST Url:", cfpRestUrlTextField,
            };

            int option = JOptionPane.showConfirmDialog(solutionPanel, dialogue, "Import", JOptionPane.OK_CANCEL_OPTION);
            if (option == JOptionPane.OK_OPTION) {
                String conferenceBaseUrl = cfpRestUrlTextField.getText();
                new ConferenceCFPImportWorker(solutionBusiness, solutionPanel, conferenceBaseUrl)
                        .executeAndShowDialog();
            }
        };
    }

    private static final class ConferenceCFPImportWorker extends SwingWorker {

        private final SolutionBusiness solutionBusiness;
        private final SolutionPanel solutionPanel;
        private String conferenceBaseUrl;

        private final JDialog dialog;

        public ConferenceCFPImportWorker(SolutionBusiness solutionBusiness,
                SolutionPanel solutionPanel,
                String conferenceBaseUrl) {
            this.solutionBusiness = solutionBusiness;
            this.solutionPanel = solutionPanel;
            this.conferenceBaseUrl = conferenceBaseUrl;
            dialog = new JDialog(solutionPanel.getSolverAndPersistenceFrame(), true);
            JPanel contentPane = new JPanel(new BorderLayout(10, 10));
            contentPane.setBorder(BorderFactory.createEmptyBorder(10, 10, 10, 10));
            contentPane.add(new JLabel("Importing CFP data in progress..."), BorderLayout.NORTH);
            JProgressBar progressBar = new JProgressBar(SwingConstants.HORIZONTAL);
            progressBar.setIndeterminate(true);
            contentPane.add(progressBar, BorderLayout.CENTER);
            JButton button = new JButton("Cancel");
            button.addActionListener(e -> cancel(false));
            contentPane.add(button, BorderLayout.SOUTH);
            dialog.setContentPane(contentPane);
            dialog.setDefaultCloseOperation(WindowConstants.DO_NOTHING_ON_CLOSE);
            dialog.addWindowListener(new WindowAdapter() {
                @Override
                public void windowClosing(WindowEvent e) {
                    cancel(false);
                }
            });
            dialog.pack();
            dialog.setLocationRelativeTo(solutionPanel.getSolverAndPersistenceFrame());
        }

        public void executeAndShowDialog() {
            execute();
            dialog.setVisible(true);
        }

        @Override
        protected ConferenceSolution doInBackground() {
            return new ConferenceSchedulingCfpDevoxxImporter(conferenceBaseUrl).importSolution();
        }

        @Override
        protected void done() {
            dialog.dispose();
            if (isCancelled()) {
                return;
            }
            ConferenceSolution cfpProblem;
            try {
                cfpProblem = get();
            } catch (InterruptedException e) {
                Thread.currentThread().interrupt();
                throw new IllegalStateException("Importing was interrupted.", e);
            } catch (ExecutionException e) {
                JOptionPane.showMessageDialog(solutionPanel,
                        "CFP import failed.\nThe next dialog will explain the cause.\n\n"
                                + "Fix it in ConferenceSchedulingCfpDevoxxImporter.java in the optaplanner repository.");
                throw new IllegalStateException("Importing failed.", e.getCause());
            }
            solutionBusiness.setSolution(cfpProblem);
            solutionBusiness.setSolutionFileName(solutionBusiness.getSolution().getConferenceName());
            JOptionPane.showMessageDialog(solutionPanel, "CFP data imported successfully.");
            solutionPanel.getSolverAndPersistenceFrame().setSolutionLoaded(null);
        }
    }
}