Tomcat example source code file (MapDemo.java)
The Tomcat MapDemo.java source code
/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You under the Apache License, Version 2.0
* (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.apache.catalina.tribes.demos;
import java.io.Serializable;
import java.util.Map;
import java.awt.ComponentOrientation;
import java.awt.Dimension;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;
import javax.swing.BoxLayout;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import javax.swing.JTable;
import javax.swing.JTextField;
import javax.swing.table.AbstractTableModel;
import javax.swing.table.TableModel;
import org.apache.catalina.tribes.Channel;
import org.apache.catalina.tribes.ChannelListener;
import org.apache.catalina.tribes.ManagedChannel;
import org.apache.catalina.tribes.Member;
import org.apache.catalina.tribes.MembershipListener;
import org.apache.catalina.tribes.tipis.AbstractReplicatedMap;
import org.apache.catalina.tribes.tipis.LazyReplicatedMap;
import javax.swing.table.DefaultTableCellRenderer;
import java.awt.Color;
import java.awt.Component;
import javax.swing.table.TableColumn;
import org.apache.catalina.tribes.util.UUIDGenerator;
import org.apache.catalina.tribes.util.Arrays;
import java.util.Set;
import java.util.Random;
/**
* <p>Title:
*
* <p>Description:
*
* <p>Company:
*
* @author not attributable
* @version 1.0
*/
public class MapDemo implements ChannelListener, MembershipListener{
protected LazyReplicatedMap map;
protected SimpleTableDemo table;
public MapDemo(Channel channel, String mapName ) {
map = new LazyReplicatedMap(null,channel,5000, mapName,null);
table = SimpleTableDemo.createAndShowGUI(map,channel.getLocalMember(false).getName());
channel.addChannelListener(this);
channel.addMembershipListener(this);
// for ( int i=0; i<1000; i++ ) {
// map.put("MyKey-"+i,"My String Value-"+i);
// }
this.messageReceived(null,null);
}
public boolean accept(Serializable msg, Member source) {
table.dataModel.getValueAt(-1,-1);
return false;
}
public void messageReceived(Serializable msg, Member source) {
}
public void memberAdded(Member member) {
}
public void memberDisappeared(Member member) {
table.dataModel.getValueAt(-1,-1);
}
public static void usage() {
System.out.println("Tribes MapDemo.");
System.out.println("Usage:\n\t" +
"java MapDemo [channel options] mapName\n\t" +
"\tChannel options:" +
ChannelCreator.usage());
}
public static void main(String[] args) throws Exception {
long start = System.currentTimeMillis();
ManagedChannel channel = (ManagedChannel) ChannelCreator.createChannel(args);
String mapName = "MapDemo";
if ( args.length > 0 && (!args[args.length-1].startsWith("-"))) {
mapName = args[args.length-1];
}
channel.start(channel.DEFAULT);
Runtime.getRuntime().addShutdownHook(new Shutdown(channel));
MapDemo demo = new MapDemo(channel,mapName);
System.out.println("System test complete, time to start="+(System.currentTimeMillis()-start)+" ms. Sleeping to let threads finish.");
Thread.sleep(60 * 1000 * 60);
}
public static class Shutdown
extends Thread {
ManagedChannel channel = null;
public Shutdown(ManagedChannel channel) {
this.channel = channel;
}
public void run() {
System.out.println("Shutting down...");
SystemExit exit = new SystemExit(5000);
exit.setDaemon(true);
exit.start();
try {
channel.stop(channel.DEFAULT);
} catch (Exception x) {
x.printStackTrace();
}
System.out.println("Channel stopped.");
}
}
public static class SystemExit
extends Thread {
private long delay;
public SystemExit(long delay) {
this.delay = delay;
}
public void run() {
try {
Thread.sleep(delay);
} catch (Exception x) {
x.printStackTrace();
}
System.exit(0);
}
}
public static class SimpleTableDemo
extends JPanel implements ActionListener{
private static int WIDTH = 550;
private LazyReplicatedMap map;
private boolean DEBUG = false;
AbstractTableModel dataModel = new AbstractTableModel() {
String[] columnNames = {
"Rownum",
"Key",
"Value",
"Primary Node",
"Backup Node",
"isPrimary",
"isProxy",
"isBackup"};
public int getColumnCount() { return columnNames.length; }
public int getRowCount() {return map.sizeFull() +1; }
public StringBuffer getMemberNames(Member[] members){
StringBuffer buf = new StringBuffer();
if ( members!=null ) {
for (int i=0;i<members.length; i++ ) {
buf.append(members[i].getName());
buf.append("; ");
}
}
return buf;
}
public Object getValueAt(int row, int col) {
if ( row==-1 ) {
update();
return "";
}
if ( row == 0 ) return columnNames[col];
Object[] keys = map.keySetFull().toArray();
String key = (String)keys [row-1];
LazyReplicatedMap.MapEntry entry = map.getInternal(key);
switch (col) {
case 0: return String.valueOf(row);
case 1: return entry.getKey();
case 2: return entry.getValue();
case 3: return entry.getPrimary()!=null?entry.getPrimary().getName():"null";
case 4: return getMemberNames(entry.getBackupNodes());
case 5: return new Boolean(entry.isPrimary());
case 6: return new Boolean(entry.isProxy());
case 7: return new Boolean(entry.isBackup());
default: return "";
}
}
public void update() {
fireTableDataChanged();
}
};
JTextField txtAddKey = new JTextField(20);
JTextField txtAddValue = new JTextField(20);
JTextField txtRemoveKey = new JTextField(20);
JTextField txtChangeKey = new JTextField(20);
JTextField txtChangeValue = new JTextField(20);
JTable table = null;
public SimpleTableDemo(LazyReplicatedMap map) {
super();
this.map = map;
this.setComponentOrientation(ComponentOrientation.LEFT_TO_RIGHT);
//final JTable table = new JTable(data, columnNames);
table = new JTable(dataModel);
table.setPreferredScrollableViewportSize(new Dimension(WIDTH, 150));
for ( int i=0; i<table.getColumnCount(); i++ ) {
TableColumn tm = table.getColumnModel().getColumn(i);
tm.setCellRenderer(new ColorRenderer());
}
if (DEBUG) {
table.addMouseListener(new MouseAdapter() {
public void mouseClicked(MouseEvent e) {
printDebugData(table);
}
});
}
//setLayout(new GridLayout(5, 0));
setLayout(new BoxLayout(this, BoxLayout.Y_AXIS));
//Create the scroll pane and add the table to it.
JScrollPane scrollPane = new JScrollPane(table);
//Add the scroll pane to this panel.
add(scrollPane);
//create a add value button
JPanel addpanel = new JPanel();
addpanel.setPreferredSize(new Dimension(WIDTH,30));
addpanel.add(createButton("Add","add"));
addpanel.add(txtAddKey);
addpanel.add(txtAddValue);
addpanel.setMaximumSize(new Dimension(WIDTH,30));
add(addpanel);
//create a remove value button
JPanel removepanel = new JPanel( );
removepanel.setPreferredSize(new Dimension(WIDTH,30));
removepanel.add(createButton("Remove","remove"));
removepanel.add(txtRemoveKey);
removepanel.setMaximumSize(new Dimension(WIDTH,30));
add(removepanel);
//create a change value button
JPanel changepanel = new JPanel( );
changepanel.add(createButton("Change","change"));
changepanel.add(txtChangeKey);
changepanel.add(txtChangeValue);
changepanel.setPreferredSize(new Dimension(WIDTH,30));
changepanel.setMaximumSize(new Dimension(WIDTH,30));
add(changepanel);
//create sync button
JPanel syncpanel = new JPanel( );
syncpanel.add(createButton("Synchronize","sync"));
syncpanel.add(createButton("Replicate","replicate"));
syncpanel.add(createButton("Random","random"));
syncpanel.setPreferredSize(new Dimension(WIDTH,30));
syncpanel.setMaximumSize(new Dimension(WIDTH,30));
add(syncpanel);
}
public JButton createButton(String text, String command) {
JButton button = new JButton(text);
button.setActionCommand(command);
button.addActionListener(this);
return button;
}
public void actionPerformed(ActionEvent e) {
System.out.println(e.getActionCommand());
if ( "add".equals(e.getActionCommand()) ) {
System.out.println("Add key:"+txtAddKey.getText()+" value:"+txtAddValue.getText());
map.put(txtAddKey.getText(),new StringBuffer(txtAddValue.getText()));
}
if ( "change".equals(e.getActionCommand()) ) {
System.out.println("Change key:"+txtChangeKey.getText()+" value:"+txtChangeValue.getText());
StringBuffer buf = (StringBuffer)map.get(txtChangeKey.getText());
if ( buf!=null ) {
buf.delete(0,buf.length());
buf.append(txtChangeValue.getText());
map.replicate(txtChangeKey.getText(),true);
} else {
buf = new StringBuffer();
buf.append(txtChangeValue.getText());
map.put(txtChangeKey.getText(),buf);
}
}
if ( "remove".equals(e.getActionCommand()) ) {
System.out.println("Remove key:"+txtRemoveKey.getText());
map.remove(txtRemoveKey.getText());
}
if ( "sync".equals(e.getActionCommand()) ) {
System.out.println("Syncing from another node.");
map.transferState();
}
if ( "random".equals(e.getActionCommand()) ) {
Thread t = new Thread() {
public void run() {
for (int i = 0; i < 5; i++) {
String key = random(5,0,0,true,true,null);
map.put(key, new StringBuffer(key));
dataModel.fireTableDataChanged();
table.paint(table.getGraphics());
try {
Thread.sleep(500);
} catch (InterruptedException x) {
Thread.currentThread().interrupted();
}
}
}
};
t.start();
}
if ( "replicate".equals(e.getActionCommand()) ) {
System.out.println("Replicating out to the other nodes.");
map.replicate(true);
}
dataModel.getValueAt(-1,-1);
}
public static Random random = new Random(System.currentTimeMillis());
public static String random(int count, int start, int end, boolean letters, boolean numbers,
char[] chars ) {
if (count == 0) {
return "";
} else if (count < 0) {
throw new IllegalArgumentException("Requested random string length " + count + " is less than 0.");
}
if ((start == 0) && (end == 0)) {
end = 'z' + 1;
start = ' ';
if (!letters && !numbers) {
start = 0;
end = Integer.MAX_VALUE;
}
}
char[] buffer = new char[count];
int gap = end - start;
while (count-- != 0) {
char ch;
if (chars == null) {
ch = (char) (random.nextInt(gap) + start);
} else {
ch = chars[random.nextInt(gap) + start];
}
if ((letters && Character.isLetter(ch))
|| (numbers && Character.isDigit(ch))
|| (!letters && !numbers))
{
if(ch >= 56320 && ch <= 57343) {
if(count == 0) {
count++;
} else {
// low surrogate, insert high surrogate after putting it in
buffer[count] = ch;
count--;
buffer[count] = (char) (55296 + random.nextInt(128));
}
} else if(ch >= 55296 && ch <= 56191) {
if(count == 0) {
count++;
} else {
// high surrogate, insert low surrogate before putting it in
buffer[count] = (char) (56320 + random.nextInt(128));
count--;
buffer[count] = ch;
}
} else if(ch >= 56192 && ch <= 56319) {
// private high surrogate, no effing clue, so skip it
count++;
} else {
buffer[count] = ch;
}
} else {
count++;
}
}
return new String(buffer);
}
private void printDebugData(JTable table) {
int numRows = table.getRowCount();
int numCols = table.getColumnCount();
javax.swing.table.TableModel model = table.getModel();
System.out.println("Value of data: ");
for (int i = 0; i < numRows; i++) {
System.out.print(" row " + i + ":");
for (int j = 0; j < numCols; j++) {
System.out.print(" " + model.getValueAt(i, j));
}
System.out.println();
}
System.out.println("--------------------------");
}
/**
* Create the GUI and show it. For thread safety,
* this method should be invoked from the
* event-dispatching thread.
*/
public static SimpleTableDemo createAndShowGUI(LazyReplicatedMap map, String title) {
//Make sure we have nice window decorations.
JFrame.setDefaultLookAndFeelDecorated(true);
//Create and set up the window.
JFrame frame = new JFrame("SimpleTableDemo - "+title);
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
//Create and set up the content pane.
SimpleTableDemo newContentPane = new SimpleTableDemo(map);
newContentPane.setOpaque(true); //content panes must be opaque
frame.setContentPane(newContentPane);
//Display the window.
frame.setSize(450,250);
newContentPane.setSize(450,300);
frame.pack();
frame.setVisible(true);
return newContentPane;
}
}
static class ColorRenderer extends DefaultTableCellRenderer {
public ColorRenderer() {
super();
}
public Component getTableCellRendererComponent
(JTable table, Object value, boolean isSelected,
boolean hasFocus, int row, int column) {
Component cell = super.getTableCellRendererComponent
(table, value, isSelected, hasFocus, row, column);
cell.setBackground(Color.WHITE);
if ( row > 0 ) {
Color color = null;
boolean primary = ( (Boolean) table.getValueAt(row, 5)).booleanValue();
boolean proxy = ( (Boolean) table.getValueAt(row, 6)).booleanValue();
boolean backup = ( (Boolean) table.getValueAt(row, 7)).booleanValue();
if (primary) color = Color.GREEN;
else if (proxy) color = Color.RED;
else if (backup) color = Color.BLUE;
if ( color != null ) cell.setBackground(color);
}
// System.out.println("Row:"+row+" Column:"+column+" Color:"+cell.getBackground());
// cell.setBackground(bkgndColor);
// cell.setForeground(fgndColor);
return cell;
}
}
}
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