org.pentaho.reporting.libraries.designtime.swing.background.WaitDialogMonitorThread.java Source code

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Here is the source code for org.pentaho.reporting.libraries.designtime.swing.background.WaitDialogMonitorThread.java

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/*!
* This program is free software; you can redistribute it and/or modify it under the
* terms of the GNU Lesser General Public License, version 2.1 as published by the Free Software
* Foundation.
*
* You should have received a copy of the GNU Lesser General Public License along with this
* program; if not, you can obtain a copy at http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html
* or from the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*
* 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 Lesser General Public License for more details.
*
* Copyright (c) 2002-2017 Hitachi Vantara..  All rights reserved.
*/

package org.pentaho.reporting.libraries.designtime.swing.background;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;

/**
 * Class which will close the wait dialog once the worker thread has completed processing (or exited early due to a
 * cancel being issued).
 */
public class WaitDialogMonitorThread extends Thread {
    private static final Log log = LogFactory.getLog(WaitDialogMonitorThread.class);
    private final WaitDialog waitDialog;
    private ProgressFeed progressFeed;
    private final Thread workerThread;
    private double progress;

    /**
     * Initializes this monitor threead
     *
     * @param workerThread the worker thread being executed
     * @param waitDialog   the dialog that should be closed when the thread exits
     */
    public WaitDialogMonitorThread(final Thread workerThread, final WaitDialog waitDialog,
            final ProgressFeed progressFeed) {
        this.workerThread = workerThread;
        this.waitDialog = waitDialog;
        this.progressFeed = progressFeed;
        this.progress = -1;
    }

    /**
     * Starts the worker thread and waits for it to complete. Then it closes the Wait dialog
     */
    public void run() {
        try {
            log.debug("Waiting for worker thread to complete");
            while (workerThread.isAlive()) {
                if (progressFeed != null) {
                    final double p = progressFeed.queryProgress();
                    if (p != progress) {
                        waitDialog.updateProgress(p);
                        progress = p;
                    }
                }
                workerThread.join(500);
            }
        } catch (Throwable t) {
            log.warn("The worker thread threw an exception: [" + t.getMessage() + "]");
        } finally {
            log.debug("The worker thread has finished - telling the dialog to close");
            waitDialog.exit();
        }
    }
}