Java example source code file (MemoryMonitor.java)
The MemoryMonitor.java Java example source code/*
* Copyright (c) 2004, 2012, Oracle and/or its affiliates. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* - Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* - Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* - Neither the name of Oracle nor the names of its
* contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
* IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
* THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
* LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
/*
* This source code is provided to illustrate the usage of a given feature
* or technique and has been deliberately simplified. Additional steps
* required for a production-quality application, such as security checks,
* input validation and proper error handling, might not be present in
* this sample code.
*/
/*
*/
import java.awt.*;
import java.awt.event.*;
import java.awt.image.BufferedImage;
import java.awt.geom.Line2D;
import java.awt.geom.Rectangle2D;
import java.util.Date;
import javax.swing.*;
import javax.swing.border.EtchedBorder;
import javax.swing.border.TitledBorder;
import java.lang.management.*;
/**
* Demo code which plots the memory usage by all memory pools.
* The memory usage is sampled at some time interval using
* java.lang.management API. This demo code is modified based
* java2d MemoryMonitor demo.
*/
public class MemoryMonitor extends JPanel {
private static final long serialVersionUID = -3463003810776195761L;
static JCheckBox dateStampCB = new JCheckBox("Output Date Stamp");
public Surface surf;
JPanel controls;
boolean doControls;
JTextField tf;
// Get memory pools.
static java.util.List<MemoryPoolMXBean> mpools =
ManagementFactory.getMemoryPoolMXBeans();
// Total number of memory pools.
static int numPools = mpools.size();
public MemoryMonitor() {
setLayout(new BorderLayout());
setBorder(new TitledBorder(new EtchedBorder(), "Memory Monitor"));
add(surf = new Surface());
controls = new JPanel();
controls.setPreferredSize(new Dimension(135,80));
Font font = new Font("serif", Font.PLAIN, 10);
JLabel label = new JLabel("Sample Rate");
label.setFont(font);
label.setForeground(Color.red);
controls.add(label);
tf = new JTextField("1000");
tf.setPreferredSize(new Dimension(45,20));
controls.add(tf);
controls.add(label = new JLabel("ms"));
label.setFont(font);
label.setForeground(Color.red);
controls.add(dateStampCB);
dateStampCB.setFont(font);
addMouseListener(new MouseAdapter() {
@Override
public void mouseClicked(MouseEvent e) {
removeAll();
if ((doControls = !doControls)) {
surf.stop();
add(controls);
} else {
try {
surf.sleepAmount = Long.parseLong(tf.getText().trim());
} catch (Exception ex) {}
surf.start();
add(surf);
}
validate();
repaint();
}
});
}
public class Surface extends JPanel implements Runnable {
public Thread thread;
public long sleepAmount = 1000;
public int usageHistCount = 20000;
private int w, h;
private BufferedImage bimg;
private Graphics2D big;
private Font font = new Font("Times New Roman", Font.PLAIN, 11);
private int columnInc;
private float usedMem[][];
private float usedMemMax[]; // Used when max pool size is undefined
private int ptNum[];
private int ascent, descent;
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);
private String usedStr;
public Surface() {
setBackground(Color.black);
addMouseListener(new MouseAdapter() {
@Override
public void mouseClicked(MouseEvent e) {
if (thread == null) start(); else stop();
}
});
usedMem = new float[numPools][];
usedMemMax = new float[numPools];
for (int i = 0; i < numPools; i++) {
usedMemMax[i] = 1024f * 1024f ;
}
ptNum = new int[numPools];
}
@Override
public Dimension getMinimumSize() {
return getPreferredSize();
}
@Override
public Dimension getMaximumSize() {
return getPreferredSize();
}
@Override
public Dimension getPreferredSize() {
return new Dimension(135,80);
}
@Override
public void paint(Graphics g) {
if (big == null) {
return;
}
big.setBackground(getBackground());
big.clearRect(0,0,w,h);
h = h / ((numPools + numPools%2) / 2);
w = w / 2;
int k=0; // index of memory pool.
for (int i=0; i < 2;i++) {
for (int j=0; j < (numPools + numPools%2)/ 2; j++) {
plotMemoryUsage(w*i,h*j,w,h,k);
if (++k >= numPools) {
i = 3;
j = (numPools + numPools%2)/ 2;
break;
}
}
}
g.drawImage(bimg, 0, 0, this);
}
public void plotMemoryUsage(int x1, int y1, int x2, int y2, int npool) {
MemoryPoolMXBean mp = mpools.get(npool);
float usedMemory = mp.getUsage().getUsed();
float totalMemory = mp.getUsage().getMax();
if (totalMemory < 0) { // Max is undefined for this pool
if (usedMemory > usedMemMax[npool]) {
usedMemMax[npool] = usedMemory;
}
totalMemory = usedMemMax[npool];
}
// .. Draw allocated and used strings ..
big.setColor(Color.green);
// Print Max memory allocated for this memory pool.
big.drawString(String.valueOf((int)totalMemory/1024) + "K Max ", x1+4.0f, (float) y1 + ascent+0.5f);
big.setColor(Color.yellow);
// Print the memory pool name.
big.drawString(mp.getName(), x1+x2/2, (float) y1 + ascent+0.5f);
// Print the memory used by this memory pool.
usedStr = String.valueOf((int)usedMemory/1024)
+ "K used";
big.setColor(Color.green);
big.drawString(usedStr, x1+4, y1+y2-descent);
// Calculate remaining size
float ssH = ascent + descent;
float remainingHeight = y2 - (ssH*2) - 0.5f;
float blockHeight = remainingHeight/10;
float blockWidth = 20.0f;
float remainingWidth = x2 - blockWidth - 10;
// .. Memory Free ..
big.setColor(mfColor);
int MemUsage = (int) (((totalMemory - usedMemory) / totalMemory) * 10);
int i = 0;
for ( ; i < MemUsage ; i++) {
mfRect.setRect(x1+5,(float) y1+ssH+i*blockHeight,
blockWidth, blockHeight-1);
big.fill(mfRect);
}
// .. Memory Used ..
big.setColor(Color.green);
for ( ; i < 10; i++) {
muRect.setRect(x1+5,(float) y1 + ssH+i*blockHeight,
blockWidth, blockHeight-1);
big.fill(muRect);
}
// .. Draw History Graph ..
if (remainingWidth <= 30) remainingWidth = (float)30;
if (remainingHeight <= ssH) remainingHeight = ssH;
big.setColor(graphColor);
int graphX = x1+30;
int graphY = y1 + (int) ssH;
int graphW = (int) remainingWidth;
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;
// Plot memory usage by this memory pool.
if (usedMem[npool] == null) {
usedMem[npool] = new float[usageHistCount];
ptNum[npool] = 0;
}
// save memory usage history.
usedMem[npool][ptNum[npool]] = usedMemory;
big.setColor(Color.yellow);
int w1; // width of memory usage history.
if (ptNum[npool] > graphW) {
w1 = graphW;
} else {
w1 = ptNum[npool];
}
for (int j=graphX+graphW-w1, k=ptNum[npool]-w1; k < ptNum[npool];
k++, j++) {
if (k != 0) {
if (usedMem[npool][k] != usedMem[npool][k-1]) {
int h1 = (int)(graphY + graphH * ((totalMemory -usedMem[npool][k-1])/totalMemory));
int h2 = (int)(graphY + graphH * ((totalMemory -usedMem[npool][k])/totalMemory));
big.drawLine(j-1, h1, j, h2);
} else {
int h1 = (int)(graphY + graphH * ((totalMemory -usedMem[npool][k])/totalMemory));
big.fillRect(j, h1, 1, 1);
}
}
}
if (ptNum[npool]+2 == usedMem[npool].length) {
// throw out oldest point
for (int j = 1;j < ptNum[npool]; j++) {
usedMem[npool][j-1] = usedMem[npool][j];
}
--ptNum[npool];
} else {
ptNum[npool]++;
}
}
public void start() {
thread = new Thread(this);
thread.setPriority(Thread.MIN_PRIORITY);
thread.setName("MemoryMonitor");
thread.start();
}
public synchronized void stop() {
thread = null;
notify();
}
@Override
public void run() {
Thread me = Thread.currentThread();
while (thread == me && !isShowing() || getSize().width == 0) {
try {
Thread.sleep(500);
} catch (InterruptedException e) { 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 = fm.getAscent();
descent = fm.getDescent();
}
repaint();
try {
Thread.sleep(sleepAmount);
} catch (InterruptedException e) { break; }
if (MemoryMonitor.dateStampCB.isSelected()) {
System.out.println(new Date().toString() + " " + usedStr);
}
}
thread = null;
}
}
// Test thread to consume memory
static class Memeater extends ClassLoader implements Runnable {
Object y[];
public Memeater() {}
@Override
public void run() {
y = new Object[10000000];
int k =0;
while(true) {
if (k == 5000000) k=0;
y[k++] = new Object();
try {
Thread.sleep(20);
} catch (Exception x){}
// to consume perm gen storage
try {
// the classes are small so we load 10 at a time
for (int i=0; i<10; i++) {
loadNext();
}
} catch (ClassNotFoundException x) {
// ignore exception
}
}
}
Class<?> loadNext() throws ClassNotFoundException {
// public class TestNNNNNN extends java.lang.Object{
// public TestNNNNNN();
// Code:
// 0: aload_0
// 1: invokespecial #1; //Method java/lang/Object."<init>":()V
// 4: return
// }
int begin[] = {
0xca, 0xfe, 0xba, 0xbe, 0x00, 0x00, 0x00, 0x30,
0x00, 0x0a, 0x0a, 0x00, 0x03, 0x00, 0x07, 0x07,
0x00, 0x08, 0x07, 0x00, 0x09, 0x01, 0x00, 0x06,
0x3c, 0x69, 0x6e, 0x69, 0x74, 0x3e, 0x01, 0x00,
0x03, 0x28, 0x29, 0x56, 0x01, 0x00, 0x04, 0x43,
0x6f, 0x64, 0x65, 0x0c, 0x00, 0x04, 0x00, 0x05,
0x01, 0x00, 0x0a, 0x54, 0x65, 0x73, 0x74 };
int end [] = {
0x01, 0x00, 0x10,
0x6a, 0x61, 0x76, 0x61, 0x2f, 0x6c, 0x61, 0x6e,
0x67, 0x2f, 0x4f, 0x62, 0x6a, 0x65, 0x63, 0x74,
0x00, 0x21, 0x00, 0x02, 0x00, 0x03, 0x00, 0x00,
0x00, 0x00, 0x00, 0x01, 0x00, 0x01, 0x00, 0x04,
0x00, 0x05, 0x00, 0x01, 0x00, 0x06, 0x00, 0x00,
0x00, 0x11, 0x00, 0x01, 0x00, 0x01, 0x00, 0x00,
0x00, 0x05, 0x2a, 0xb7, 0x00, 0x01, 0xb1, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00 };
// TestNNNNNN
String name = "Test" + Integer.toString(count++);
byte value[];
try {
value = name.substring(4).getBytes("UTF-8");
} catch (java.io.UnsupportedEncodingException x) {
throw new Error();
}
// construct class file
int len = begin.length + value.length + end.length;
byte b[] = new byte[len];
int pos=0;
for (int i: begin) {
b[pos++] = (byte) i;
}
for (byte v: value) {
b[pos++] = v;
}
for (int e: end) {
b[pos++] = (byte) e;
}
return defineClass(name, b, 0, b.length);
}
static int count = 100000;
}
public static void main(String s[]) {
final MemoryMonitor demo = new MemoryMonitor();
WindowListener l = new WindowAdapter() {
@Override
public void windowClosing(WindowEvent e) {System.exit(0);}
@Override
public void windowDeiconified(WindowEvent e) { demo.surf.start(); }
@Override
public void windowIconified(WindowEvent e) { demo.surf.stop(); }
};
JFrame f = new JFrame("MemoryMonitor");
f.addWindowListener(l);
f.getContentPane().add("Center", demo);
f.pack();
f.setSize(new Dimension(400,500));
f.setVisible(true);
demo.surf.start();
Thread thr = new Thread(new Memeater());
thr.start();
}
}
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