MemoryMonitorProgressBar.java

package tk.amberide.ide.swing.misc;

import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;
import javax.swing.JProgressBar;
import javax.swing.SwingUtilities;

public class MemoryMonitorProgressBar extends JProgressBar {

    protected int sleepTime;

    public MemoryMonitorProgressBar() {
        sleepTime = 1000 * 10;

        setStringPainted(true);

        Thread memoryThread = new Thread(new Runnable() {
            public void run() {
                while (true) {
                    update();
                    try {
                        Thread.sleep(MemoryMonitorProgressBar.this.sleepTime);
                    } catch (InterruptedException e) {
                    }
                }
            }
        });
        memoryThread.setDaemon(true);
        memoryThread.setPriority(1);
        memoryThread.start();
        this.addMouseListener(new MouseAdapter() {
            @Override
            public void mouseClicked(MouseEvent evt) {
                if (SwingUtilities.isLeftMouseButton(evt)) {                 
                    Runtime.getRuntime().gc();
                    update();
                }
            }
        });
    }

    protected void update() {
        int used = (int) ((Runtime.getRuntime().totalMemory() - Runtime.getRuntime().freeMemory()) / 1024 / 1024);
        int total = (int) (Runtime.getRuntime().totalMemory() / 1024 / 1024);
        final String unit;
        if (used >= 1000 || total >= 1000) {
            used /= 1024;
            total /= 1024;
            unit = "GB";
        } else
            unit = "MB";
        final int used_ = used;
        final int total_ = total;

        SwingUtilities.invokeLater(new Runnable() {
            @Override
            public void run() {
                setMaximum(total_);
                setValue(used_);
                setString(used_ + " " + unit + "/" + total_ + " " + unit);
            }
        });
    }

    public void setSleepTime(int sleepTime) {
        this.sleepTime = sleepTime;
    }
}