Class MemoryMonitor

ij/src/main/java/ij/plugin/frame/MemoryMonitor.java:11–132

This plugin continuously plots ImageJ's memory utilization. Click on the plot to force the JVM to do garbage collection.

/** This plugin continuously plots ImageJ's memory utilization. 
	Click on the plot to force the JVM to do garbage collection. */
public class MemoryMonitor extends PlugInFrame {
	private static final double scale = Prefs.getGuiScale();
 	private static final int width = (int)(250*scale);
 	private static final int height = (int)(90*scale);
	private static final String LOC_KEY = "memory.loc";
	private static MemoryMonitor instance;
	private Image image;
	private Graphics2D g;
	private int frames;
	private double[] mem;
	private int index;
	private long value;
 	private double defaultMax = 20*1024*1024; // 20MB
	private double max = defaultMax;
	private long maxMemory = IJ.maxMemory();
	private boolean done;

	public MemoryMonitor() {
		super("Memory");
		if (instance!=null) {
			WindowManager.toFront(instance);
			return;
		}
		instance = this;
		WindowManager.addWindow(this);
		
		setLayout(new BorderLayout());
		Canvas ic = new PlotCanvas();
		ic.setSize(width, height);
		add(ic);
		setResizable(false);
		pack();
		Point loc = Prefs.getLocation(LOC_KEY);
		if (loc!=null)
			setLocation(loc);
		else
			GUI.centerOnImageJScreen(this);
		image = createImage(width,height);
		g = (Graphics2D)image.getGraphics();
		g.setRenderingHint(RenderingHints.KEY_TEXT_ANTIALIASING, RenderingHints.VALUE_TEXT_ANTIALIAS_ON);
		g.setColor(Color.white);
		g.fillRect(0, 0, width, height);
		g.setFont(new Font("SansSerif",Font.PLAIN,(int)(12*Prefs.getGuiScale())));
		show();
		ImageJ ij = IJ.getInstance();
		if (ij!=null) {
			addKeyListener(ij);
			ic.addKeyListener(ij);
			ic.addMouseListener(ij);
		}
		mem = new double[width+1];
		Thread.currentThread().setPriority(Thread.MIN_PRIORITY);
       	while (!done) {
			updatePlot();
         	addText();
			ic.repaint();
        	IJ.wait(50);
       		frames++;