001    /*
002     * Copyright (C) 2008-2010 by Holger Arndt
003     *
004     * This file is part of the Universal Java Matrix Package (UJMP).
005     * See the NOTICE file distributed with this work for additional
006     * information regarding copyright ownership and licensing.
007     *
008     * UJMP is free software; you can redistribute it and/or modify
009     * it under the terms of the GNU Lesser General Public License as
010     * published by the Free Software Foundation; either version 2
011     * of the License, or (at your option) any later version.
012     *
013     * UJMP is distributed in the hope that it will be useful,
014     * but WITHOUT ANY WARRANTY; without even the implied warranty of
015     * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
016     * GNU Lesser General Public License for more details.
017     *
018     * You should have received a copy of the GNU Lesser General Public
019     * License along with UJMP; if not, write to the
020     * Free Software Foundation, Inc., 51 Franklin St, Fifth Floor,
021     * Boston, MA  02110-1301  USA
022     */
023    
024    package org.ujmp.gui.statusbar;
025    
026    import java.awt.Dimension;
027    import java.util.TimerTask;
028    
029    import javax.swing.BorderFactory;
030    import javax.swing.JProgressBar;
031    
032    import org.ujmp.gui.util.GlobalTimer;
033    
034    public class MemoryUsage extends JProgressBar {
035            private static final long serialVersionUID = 5692292627429288637L;
036    
037            public MemoryUsage() {
038                    setBorder(BorderFactory.createEtchedBorder());
039                    setMinimumSize(new Dimension(50, 30));
040                    GlobalTimer.getInstance().schedule(new UpdateTask(this), 0, 1000);
041            }
042    
043            public void update() {
044                    int max = (int) Runtime.getRuntime().maxMemory() / 1048576;
045                    int total = (int) Runtime.getRuntime().totalMemory() / 1048576;
046                    int free = (int) Runtime.getRuntime().freeMemory() / 1048576;
047                    int used = total - free;
048                    setMinimum(0);
049                    setMaximum(max);
050                    setValue(used);
051                    setToolTipText("" + used + "MB of " + max + "MB used");
052            }
053    
054            class UpdateTask extends TimerTask {
055    
056                    private MemoryUsage memoryUsage = null;
057    
058                    public UpdateTask(MemoryUsage memoryUsage) {
059                            this.memoryUsage = memoryUsage;
060                    }
061    
062                    
063                    public void run() {
064                            memoryUsage.update();
065                    }
066    
067            }
068    
069    }