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Java Source | 1998-12-01 | 8.5 KB | 259 lines |
- /*
- * @(#)MemoryMonitor.java 1.24 98/09/13
- *
- * Copyright 1998 by Sun Microsystems, Inc.,
- * 901 San Antonio Road, Palo Alto, California, 94303, U.S.A.
- * All rights reserved.
- *
- * This software is the confidential and proprietary information
- * of Sun Microsystems, Inc. ("Confidential Information"). You
- * shall not disclose such Confidential Information and shall use
- * it only in accordance with the terms of the license agreement
- * you entered into with Sun.
- */
-
- import java.awt.*;
- import java.awt.event.*;
- import java.awt.image.BufferedImage;
- import java.awt.geom.Line2D;
- import java.awt.geom.Rectangle2D;
- import javax.swing.JPanel;
- import javax.swing.border.EtchedBorder;
- import javax.swing.border.TitledBorder;
-
-
- /**
- * Tracks Memory allocated & used, displayed in graph form.
- */
- public class MemoryMonitor extends JPanel {
-
- public MonitorComponent mc;
-
- public MemoryMonitor() {
- setLayout(new BorderLayout());
- setBorder(new TitledBorder(new EtchedBorder(), "Memory Monitor"));
- mc = new MonitorComponent();
- add(mc);
- }
-
-
- public class MonitorComponent extends JPanel implements Runnable
- {
- public Thread thread;
- private int w, h;
- private BufferedImage bimg;
- private Graphics2D big;
- private Font font = new Font("Times New Roman", Font.PLAIN, 11);
- private Runtime r = Runtime.getRuntime();
- private int columnInc;
- private int pts[];
- private int ptNum;
- private int ascent, descent;
- private float freeMemory, totalMemory;
- private Rectangle graphOutlineRect = new Rectangle();
- private Rectangle2D mfRect = new Rectangle2D.Float();
- private Rectangle2D muRect = new Rectangle2D.Float();
- private Line2D graphLine = new Line2D.Float();
- private Color graphColor = new Color(46, 139, 87);
- private Color mfColor = new Color(0, 100, 0);
-
-
- public MonitorComponent() {
- setBackground(Color.black);
- addMouseListener(new MouseAdapter() {
- public void mouseClicked(MouseEvent e) {
- if (thread == null) start(); else stop();
- }
- });
- start();
- }
-
- public Dimension getMinimumSize() {
- return getPreferredSize();
- }
-
- public Dimension getMaximumSize() {
- return getPreferredSize();
- }
-
- public Dimension getPreferredSize() {
- return new Dimension(140,80);
- }
-
-
- public void paint(Graphics g) {
-
- if (big == null) {
- return;
- }
-
- big.setBackground(getBackground());
- big.clearRect(0,0,w,h);
-
- float freeMemory = (float) r.freeMemory();
- float totalMemory = (float) r.totalMemory();
-
- // .. Draw allocated and used strings ..
- big.setColor(Color.green);
- big.drawString(String.valueOf((int) totalMemory/1024) + "K allocated", 4.0f, (float) ascent+0.5f);
- big.drawString(String.valueOf(((int) (totalMemory - freeMemory))/1024) + "K used", 4, h-descent);
-
- // Calculate remaining size
- float ssH = ascent + descent;
- float remainingHeight = (float) (h - (ssH*2) - 0.5f);
- float blockHeight = remainingHeight/10;
- float blockWidth = 20.0f;
- float remainingWidth = (float) (w - blockWidth - 10);
-
- // .. Memory Free ..
- big.setColor(mfColor);
- int MemUsage = (int) ((freeMemory / totalMemory) * 10);
- int i = 0;
- for ( ; i < MemUsage ; i++) {
- mfRect.setRect(5,(float) ssH+i*blockHeight,
- blockWidth,(float) blockHeight-1);
- big.fill(mfRect);
- }
-
- // .. Memory Used ..
- big.setColor(Color.green);
- for ( ; i < 10; i++) {
- muRect.setRect(5,(float) ssH+i*blockHeight,
- blockWidth,(float) blockHeight-1);
- big.fill(muRect);
- }
-
- // .. Draw History Graph ..
- big.setColor(graphColor);
- int graphX = 30;
- int graphY = (int) ssH;
- int graphW = w - graphX - 5;
- int graphH = (int) remainingHeight;
- graphOutlineRect.setRect(graphX, graphY, graphW, graphH);
- big.draw(graphOutlineRect);
-
- int graphRow = graphH/10;
-
- // .. Draw row ..
- for (int j = graphY; j <= graphH+graphY; j += graphRow) {
- graphLine.setLine(graphX,j,graphX+graphW,j);
- big.draw(graphLine);
- }
-
- // .. Draw animated column movement ..
- int graphColumn = graphW/15;
-
- if (columnInc == 0) {
- columnInc = graphColumn;
- }
-
- for (int j = graphX+columnInc; j < graphW+graphX; j+=graphColumn) {
- graphLine.setLine(j,graphY,j,graphY+graphH);
- big.draw(graphLine);
- }
-
- --columnInc;
-
- if (pts == null) {
- pts = new int[graphW];
- ptNum = 0;
- } else if (pts.length != graphW) {
- int tmp[] = null;
- if (ptNum < graphW) {
- tmp = new int[ptNum];
- System.arraycopy(pts, 0, tmp, 0, tmp.length);
- } else {
- tmp = new int[graphW];
- System.arraycopy(pts, pts.length-tmp.length, tmp, 0, tmp.length);
- ptNum = tmp.length - 2;
- }
- pts = new int[graphW];
- System.arraycopy(tmp, 0, pts, 0, tmp.length);
- } else {
- big.setColor(Color.yellow);
- pts[ptNum] = (int)(graphY+graphH*(freeMemory/totalMemory));
- for (int j=graphX+graphW-ptNum, k=0;k < ptNum; k++, j++) {
- if (k != 0) {
- if (pts[k] != pts[k-1]) {
- big.drawLine(j-1, pts[k-1], j, pts[k]);
- } else {
- big.fillRect(j, pts[k], 1, 1);
- }
- }
- }
- if (ptNum+2 == pts.length) {
- // throw out oldest point
- for (int j = 1;j < ptNum; j++) {
- pts[j-1] = pts[j];
- }
- --ptNum;
- } else {
- ptNum++;
- }
- }
- g.drawImage(bimg, 0, 0, this);
- }
-
-
- public void start() {
- thread = new Thread(this);
- thread.setPriority(Thread.MIN_PRIORITY);
- thread.setName("MemoryMonitor");
- thread.start();
- }
-
-
- public synchronized void stop() {
- thread = null;
- notify();
- }
-
-
- public void run() {
-
- Thread me = Thread.currentThread();
-
- while (thread == me && !isShowing() || getSize().width == 0) {
- try {
- Thread.sleep(500);
- } catch (InterruptedException e) { thread = null; return; }
- }
-
- while (thread == me && isShowing()) {
- Dimension d = getSize();
- if (d.width != w || d.height != h) {
- w = d.width;
- h = d.height;
- bimg = (BufferedImage) createImage(w, h);
- big = bimg.createGraphics();
- big.setFont(font);
- FontMetrics fm = big.getFontMetrics(font);
- ascent = (int) fm.getAscent();
- descent = (int) fm.getDescent();
- }
- repaint();
- try {
- thread.sleep(999);
- } catch (InterruptedException e) { break; }
- }
- thread = null;
- }
- }
-
-
- public static void main(String s[]) {
- final MemoryMonitor demo = new MemoryMonitor();
- WindowListener l = new WindowAdapter() {
- public void windowClosing(WindowEvent e) {System.exit(0);}
- public void windowDeiconified(WindowEvent e) { demo.mc.start(); }
- public void windowIconified(WindowEvent e) { demo.mc.stop(); }
- };
- Frame f = new Frame("Java2D Demo - MemoryMonitor");
- f.addWindowListener(l);
- f.add("Center", demo);
- f.pack();
- f.setSize(new Dimension(200,200));
- f.show();
- }
- }
-