How to write a GUI application that uses a JMS QueueBrowser to browse the contents of a queue
/*
* @(#)SimpleChat.java 1.10 04/01/05
*
* Copyright (c) 2000-2002 Sun Microsystems, Inc. All Rights Reserved.
*
* Sun grants you ("Licensee") a non-exclusive, royalty free, license to use,
* modify and redistribute this software in source and binary code form,
* provided that i) this copyright notice and license appear on all copies of
* the software; and ii) Licensee does not utilize the software in a manner
* which is disparaging to Sun.
*
* This software is provided "AS IS," without a warranty of any kind. ALL
* EXPRESS OR IMPLIED CONDITIONS, REPRESENTATIONS AND WARRANTIES, INCLUDING ANY
* IMPLIED WARRANTY OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE OR
* NON-INFRINGEMENT, ARE HEREBY EXCLUDED. SUN AND ITS LICENSORS SHALL NOT BE
* LIABLE FOR ANY DAMAGES SUFFERED BY LICENSEE AS A RESULT OF USING, MODIFYING
* OR DISTRIBUTING THE SOFTWARE OR ITS DERIVATIVES. IN NO EVENT WILL SUN OR ITS
* LICENSORS BE LIABLE FOR ANY LOST REVENUE, PROFIT OR DATA, OR FOR DIRECT,
* INDIRECT, SPECIAL, CONSEQUENTIAL, INCIDENTAL OR PUNITIVE DAMAGES, HOWEVER
* CAUSED AND REGARDLESS OF THE THEORY OF LIABILITY, ARISING OUT OF THE USE OF
* OR INABILITY TO USE SOFTWARE, EVEN IF SUN HAS BEEN ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGES.
*
* This software is not designed or intended for use in on-line control of
* aircraft, air traffic, aircraft navigation or aircraft communications; or in
* the design, construction, operation or maintenance of any nuclear
* facility. Licensee represents and warrants that it will not use or
* redistribute the Software for such purposes.
*/
================================================================================
@(#)README 1.7 03/22/05
================================================================================
QueueBrowser example
Description
-----------
This example illustrates how to write a GUI application that uses a
JMS QueueBrowser to browse the contents of a queue. It also illustrates
the use of the Message Queue monitoring API to get the list of destinations
from the Message Queue broker.
Some basic info on this example:
- Subscribes to the "mq.metrics.detination_list" topic to get the
list of destinations from imqbrokerd and places them in a menu
(only works with EE edition).
- Creates a QueueBrowser for the particular queue specified.
- Lists messages on the queue, and displays the contents of a
selected message.
- Uses javax.swing for GUI components.
Files
-----
QBrowser.java Source file for this example.
*.class Prebuilt Java class files for this example.
README This file.
Configuring the environment
---------------------------
To recompile or run this example, you need to set CLASSPATH
to include at least:
jms.jar
imq.jar
directory containing this example
A detailed guideline on setting CLASSPATH is found in the README
file in the jms demo subdirectory as well as in the "Quick Start
Tutorial" in the Sun Java(tm) System Message Queue Developer's Guide.
The following are examples for setting CLASSPATH on the different
platforms. These commands are run from the directory containing
this example.
On Solaris:
setenv CLASSPATH /usr/share/lib/jms.jar:/usr/share/lib/imq.jar:.
On Windows:
set CLASSPATH=%IMQ_HOME%\lib\jms.jar;%IMQ_HOME%\lib\imq.jar;.
On Linux:
setenv CLASSPATH /opt/sun/mq/share/lib/jms.jar:
/opt/sun/mq/share/lib/imq.jar:.
#####hpux-dev#####
On HP-UX:
export CLASSPATH=/opt/sun/mq/share/lib/jms.jar:/opt/sun/mq/share/lib/imq.jar:.
Note that it is assumed that the above export command is run on
BASH shell
Building the example
--------------------
Run the following:
javac QBrowser.java
Running the example
-------------------
By default QBrowser will connect to the broker running on localhost:7676.
You can use -DimqAddressList attribute to change the host, port and
transport:
java -DimqAddressList=mq://<host>:<port>/jms QBrowser
QBrowser will connect to the broker specified. The menu associated
with the "Queue Name" text field will populate with queue names
from the specified broker.
Select a queue from the menu, or type in a queue and click Browse.
QBrowser will list all messages in the queue.
Select a message and click "Details" to see the message contents
(properties, body, etc). Or double click.
If you don't have any queues with messages on them, try running
the jms/SenderToQueue example to send a few messages to a queue.
For example:
[ Run from the jms demo subdirectory ]
java SenderToQueue myqueue 5
QBrowser updates it's list of destinations every few minutes.
/*
* @(#)SimpleChat.java 1.10 04/01/05
*
* Copyright (c) 2000-2002 Sun Microsystems, Inc. All Rights Reserved.
*
* Sun grants you ("Licensee") a non-exclusive, royalty free, license to use,
* modify and redistribute this software in source and binary code form,
* provided that i) this copyright notice and license appear on all copies of
* the software; and ii) Licensee does not utilize the software in a manner
* which is disparaging to Sun.
*
* This software is provided "AS IS," without a warranty of any kind. ALL
* EXPRESS OR IMPLIED CONDITIONS, REPRESENTATIONS AND WARRANTIES, INCLUDING ANY
* IMPLIED WARRANTY OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE OR
* NON-INFRINGEMENT, ARE HEREBY EXCLUDED. SUN AND ITS LICENSORS SHALL NOT BE
* LIABLE FOR ANY DAMAGES SUFFERED BY LICENSEE AS A RESULT OF USING, MODIFYING
* OR DISTRIBUTING THE SOFTWARE OR ITS DERIVATIVES. IN NO EVENT WILL SUN OR ITS
* LICENSORS BE LIABLE FOR ANY LOST REVENUE, PROFIT OR DATA, OR FOR DIRECT,
* INDIRECT, SPECIAL, CONSEQUENTIAL, INCIDENTAL OR PUNITIVE DAMAGES, HOWEVER
* CAUSED AND REGARDLESS OF THE THEORY OF LIABILITY, ARISING OUT OF THE USE OF
* OR INABILITY TO USE SOFTWARE, EVEN IF SUN HAS BEEN ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGES.
*
* This software is not designed or intended for use in on-line control of
* aircraft, air traffic, aircraft navigation or aircraft communications; or in
* the design, construction, operation or maintenance of any nuclear
* facility. Licensee represents and warrants that it will not use or
* redistribute the Software for such purposes.
*/
/*
* @(#)QBrowser.java 1.7 09/15/04
*
* Copyright 2003 Sun Microsystems, Inc. All Rights Reserved
* SUN PROPRIETARY/CONFIDENTIAL
* Use is subject to license terms.
*
*/
import java.awt.*;
import java.util.*;
import java.text.*;
import java.awt.event.*;
import javax.swing.*;
import javax.swing.event.*;
import javax.swing.table.*;
import javax.jms.ConnectionFactory;
import javax.jms.Connection;
import javax.jms.Session;
import javax.jms.Destination;
import javax.jms.Queue;
import javax.jms.Topic;
import javax.jms.MessageConsumer;
import javax.jms.Message;
import javax.jms.QueueBrowser;
import javax.jms.DeliveryMode;
import javax.jms.StreamMessage;
import javax.jms.MapMessage;
import javax.jms.ObjectMessage;
import javax.jms.BytesMessage;
import javax.jms.TextMessage;
import javax.jms.JMSException;
/**
* The QBrowser example is a GUI application that lets you visually
* examine the contents of a JMS Queue. It is written using javax.swing.
*
* By default QBrowser will connect to the imqbrokerd running
* on localhost:7676. You can use -DimqAddressList attribute to change
* the host, port and transport:
*
* java -DimqAddressList=mq://<host>:<port>/jms QBrowser
*
* Once QBrowser is up, enter the name of a queue and click Browse.
* A list of messages on the queue will appear in the main window.
* Select a message and click "Details" to see the contents of the message.
*
* QBrowser consists of the following classes:
*
* QBrowser main(), the base GUI frame, and the JMS code
* MsgTable A TableModel for handling the display of messages on a queue
* PropertyPanel A JPanel with a scrolling text area for displaying
* simple text, or the contents of a HashMap.
* A number of minor event handling classes.
*
*/
public class QBrowser extends JPanel implements javax.jms.MessageListener {
JMenuItem exit_item = null;
JLabel qLabel = null;
JComboBox qBox = null;
JButton qBrowse = null;
JTable msgTable = null;
JLabel footerLabel = null;
JPanel footerPanel = null;
QueueBrowser qb = null;
Session session = null;
Connection connection = null;
Topic metricTopic = null;
MessageConsumer metricSubscriber = null;
JFrame detailsFrame = null;
PropertyPanel headerPanel = null, propertyPanel = null, bodyPanel = null;
static final String DEST_LIST_TOPIC_NAME = "mq.metrics.destination_list";
public static String version = "1.0";
public static String title = "QBrowser " + version;
public static String[] pad = {"", "0", "00", "000", "0000"};
public static String serverHost = "localhost";
public static int serverPort = 7676;
QBrowser() {
super(true);
setBorder(BorderFactory.createEtchedBorder());
setLayout(new BorderLayout());
// Create menu bar
JMenuBar menubar = new JMenuBar();
JMenu menu = new JMenu("File");
exit_item = new JMenuItem("Exit");
exit_item.addActionListener(new ExitListener());
menu.add(exit_item);
menubar.add(menu);
// Create panel to hold input area for Q name and Browse button
JPanel qPanel = new JPanel();
qPanel.setLayout(new BorderLayout());
qPanel.add(BorderLayout.NORTH, menubar);
qLabel = new JLabel("Queue Name: ");
qPanel.add(BorderLayout.WEST, qLabel);
qBox = new JComboBox();
Dimension d = qBox.getPreferredSize();
d.setSize(10 * d.getWidth(), d.getHeight());
qBox.setPreferredSize(d);
qBox.setEditable(true);
//qBox.addActionListener(new BrowseListener());
qPanel.add(BorderLayout.CENTER, qBox);
qBrowse = new JButton("Browse");
qBrowse.addActionListener(new BrowseListener() );
qPanel.add(BorderLayout.EAST, qBrowse);
qPanel.updateUI();
//qPanel.setBackground(Color.YELLOW);
add(BorderLayout.NORTH, qPanel);
// Create panel to hold table of messages
JPanel tPanel = new JPanel();
tPanel.setLayout(new BorderLayout());
msgTable = new JTable(new MsgTable());
msgTable.addMouseListener(new TableMouseListener());
TableColumn column = msgTable.getColumnModel().getColumn(1);
column.setPreferredWidth(190);
column = msgTable.getColumnModel().getColumn(2);
column.setPreferredWidth(130);
JScrollPane tablePane = new JScrollPane(msgTable);
tablePane.setPreferredSize(new Dimension(100, 300));
//tablePane.setMinimumSize(new Dimension(100, 100));
tPanel.add(BorderLayout.CENTER, tablePane);
add(BorderLayout.CENTER, tPanel);
// Create footer
footerPanel = new JPanel();
footerPanel.setLayout(new BorderLayout());
footerLabel = new JLabel("");
footerPanel.add(BorderLayout.WEST, footerLabel);
JButton details = new JButton("Details...");
details.addActionListener(new DetailsListener() );
footerPanel.add(BorderLayout.EAST, details);
add(BorderLayout.SOUTH, footerPanel);
setFooter("Enter a Queue Name and click Browse");
try {
connect();
} catch (JMSException ex) {
System.err.println("Could not initialize JMS: " + ex);
System.err.println(
"Are you sure there is an imqbrokerd running on " +
serverHost + ":" + serverPort + "?" );
usage();
}
}
private void shutdownJMS() {
try {
connection.close();
} catch (JMSException e) {
System.out.println("Exception closing JMS connection: " + e);
}
}
/**
* Initialize JMS by creating Connection and Session.
*/
private void initJMS() throws JMSException {
ConnectionFactory cf = null;
cf = new com.sun.messaging.ConnectionFactory();
connection = cf.createConnection();
session = connection.createSession(false, Session.AUTO_ACKNOWLEDGE);
}
/**
* Setup a consumer that listens on the Message Queue monitoring topic
* that sends out lists of destinations.
*/
private void initDestListConsumer() throws JMSException {
metricTopic = session.createTopic(DEST_LIST_TOPIC_NAME);
metricSubscriber = session.createConsumer(metricTopic);
metricSubscriber.setMessageListener(this);
}
/**
* Set text on footer
*/
private void setFooter(String s) {
footerLabel.setText(s);
footerLabel.paintImmediately(footerLabel.getBounds());
}
/**
* Show the contents of a message in a seperate popup window
*/
private void showDetails(Message msg, int msgno) {
if (detailsFrame == null) {
// Create popup
detailsFrame = new JFrame();
detailsFrame.setTitle(QBrowser.title + " - Message Details");
detailsFrame.setBackground(Color.white);
detailsFrame.getContentPane().setLayout(new BorderLayout());
headerPanel = new PropertyPanel();
headerPanel.setTitle("JMS Headers");
detailsFrame.getContentPane().add(BorderLayout.NORTH, headerPanel);
propertyPanel = new PropertyPanel();
propertyPanel.setTitle("Message Properties");
detailsFrame.getContentPane().add(BorderLayout.CENTER, propertyPanel);
bodyPanel = new PropertyPanel();
bodyPanel.setTitle("Message body");
detailsFrame.getContentPane().add(BorderLayout.SOUTH, bodyPanel);
detailsFrame.pack();
}
// Load JMS headers from message
try {
HashMap hdrs = jmsHeadersToHashMap(msg);
headerPanel.setTitle("JMS Headers: Message #" + msgno);
headerPanel.load(hdrs);
} catch (JMSException ex) {
setFooter("Error: " + ex.getMessage());
}
// Load message properties
HashMap props = new HashMap();
// Get all message properties and stuff into a hash table
try {
for (Enumeration enu = msg.getPropertyNames();
enu.hasMoreElements();) {
String name = (enu.nextElement()).toString();
props.put(name, (msg.getObjectProperty(name)).toString());
}
} catch (JMSException ex) {
setFooter("Error: " + ex.getMessage());
}
propertyPanel.load(props);
// Load message body
bodyPanel.setTitle("Message Body: (" + QBrowser.messageType(msg) + ")");
bodyPanel.load(jmsMsgBodyAsString(msg));
detailsFrame.show();
}
private void connect() throws JMSException {
if (connection == null) {
setFooter("Connecting to " + serverHost + ":" +
serverPort + "...");
initJMS();
try {
initDestListConsumer();
} catch (JMSException e) {
// If we can't subscribe to the mq.metrics topic then we
// are probably not running against an EE broker. That's
// OK. It just means we can't populate the Destination
// combo-box on the GUI.
//System.out.println("Could not subscribe to " +
// DEST_LIST_TOPIC_NAME);
}
connection.start();
setFooter("Connected to " + serverHost + ":" + serverPort);
}
}
/**
* Browse the queue
*/
private void doBrowse() {
ComboBoxEditor editor = qBox.getEditor();
String name = (String)editor.getItem();
setFooter("Browsing " + name + "...");
// Browse queue
try {
String selector = null;
Queue q = session.createQueue(name);
QueueBrowser qb;
if (selector == null) {
qb = session.createBrowser(q);
} else {
qb = session.createBrowser(q, selector);
}
// Load messages into table
MsgTable mt = (MsgTable)msgTable.getModel();
int n = mt.load(qb.getEnumeration());
setFooter(name + ": " + String.valueOf(n));
qb.close();
} catch (JMSException ex) {
setFooter(ex.getMessage());
}
}
/**
* Add a name to the "Queue Name" combo box menu
*/
private void addDestToMenu(String name) {
DefaultComboBoxModel model = (DefaultComboBoxModel)qBox.getModel();
if (model.getIndexOf(name) < 0) {
// Name is not in menu. Add it.
model.addElement(name);
}
}
/**
* Main
*/
public static void main (String args[]) {
if (args.length > 0) {
usage();
}
String address = System.getProperty("imqAddressList");
if (address != null) {
int i = address.indexOf('/');
int j = address.lastIndexOf(':');
int k = address.indexOf('/', j);
if (j > i+2) {
serverHost = address.substring(i+2, j);
}
if (k > j) {
serverPort = Integer.parseInt(address.substring(j+1, k));
}
}
JFrame frame = new JFrame();
frame.setTitle(QBrowser.title + " - " + serverHost + ":" + serverPort);
frame.setBackground(Color.white);
frame.getContentPane().setLayout(new BorderLayout());
frame.getContentPane().add("Center", new QBrowser());
frame.pack();
frame.show();
}
private static void usage() {
System.out.println(
"usage: java QBrowser \n" );
System.exit(1);
}
public static void dumpException(Exception e) {
Exception linked = null;
if (e instanceof JMSException) {
linked = ((JMSException)e).getLinkedException();
}
if (linked == null) {
e.printStackTrace();
} else {
System.err.println(e.toString());
linked.printStackTrace();
}
}
/**
* Return a string description of the type of JMS message
*/
static String messageType(Message m) {
if (m instanceof TextMessage) {
return "TextMessage";
} else if (m instanceof BytesMessage) {
return "BytesMessage";
} else if (m instanceof MapMessage) {
return "MapMessage";
} else if (m instanceof ObjectMessage) {
return "ObjectMessage";
} else if (m instanceof StreamMessage) {
return "StreamMessage";
} else if (m instanceof Message) {
return "Message";
} else {
// Unknown Message type
String type = m.getClass().getName();
StringTokenizer st = new StringTokenizer(type, ".");
String s = null;
while (st.hasMoreElements()) {
s = st.nextToken();
}
return s;
}
}
/**
* Return a string representation of the body of a JMS
* bytes message. This is basically a hex dump of the body.
* Note, this only looks at the first 1K of the message body.
*/
private static String jmsBytesBodyAsString(Message m) {
byte[] body = new byte[1024];
int n = 0;
if (m instanceof BytesMessage) {
try {
((BytesMessage)m).reset();
n = ((BytesMessage)m).readBytes(body);
} catch (JMSException ex) {
return (ex.toString());
}
} else if (m instanceof StreamMessage) {
try {
((StreamMessage)m).reset();
n = ((StreamMessage)m).readBytes(body);
} catch (JMSException ex) {
return (ex.toString());
}
}
if (n <= 0) {
return "<empty body>";
} else {
return(toHexDump(body, n) +
((n >= body.length ) ? "\n. . ." : "") );
}
}
/**
* Return a string representation of a JMS message body
*/
private static String jmsMsgBodyAsString(Message m) {
if (m instanceof TextMessage) {
try {
return ((TextMessage) m).getText();
} catch (JMSException ex) {
return ex.toString();
}
} else if (m instanceof BytesMessage) {
return jmsBytesBodyAsString(m);
} else if (m instanceof MapMessage) {
MapMessage msg = (MapMessage)m;
HashMap props = new HashMap();
// Get all MapMessage properties and stuff into a hash table
try {
for (Enumeration enu = msg.getMapNames();
enu.hasMoreElements();) {
String name = (enu.nextElement()).toString();
props.put(name, (msg.getObject(name)).toString());
}
return props.toString();
} catch (JMSException ex) {
return (ex.toString());
}
} else if (m instanceof ObjectMessage) {
ObjectMessage msg = (ObjectMessage)m;
Object obj = null;
try {
obj = msg.getObject();
if (obj != null) {
return obj.toString();
} else {
return "null";
}
} catch (Exception ex) {
return (ex.toString());
}
} else if (m instanceof StreamMessage) {
return jmsBytesBodyAsString(m);
} else if (m instanceof Message) {
return "Can't get body for message of type Message";
}
return "Unknown message type " + m;
}
/**
* Takes the JMS header fields of a JMS message and puts them in
* a HashMap
*/
private static HashMap jmsHeadersToHashMap(Message m) throws JMSException {
HashMap hdrs = new HashMap();
String s = null;
s = m.getJMSCorrelationID();
hdrs.put("JMSCorrelationID", s);
s = String.valueOf(m.getJMSDeliveryMode());
hdrs.put("JMSDeliverMode", s);
Destination d = m.getJMSDestination();
if (d != null) {
if (d instanceof Queue) {
s = ((Queue)d).getQueueName();
} else {
s = ((Topic)d).getTopicName();
}
} else {
s = "";
}
hdrs.put("JMSDestination", s);
s = String.valueOf(m.getJMSExpiration());
hdrs.put("JMSExpiration", s);
s = m.getJMSMessageID();
hdrs.put("JMSMessageID", s);
s = String.valueOf(m.getJMSPriority());
hdrs.put("JMSPriority", s);
s = String.valueOf(m.getJMSRedelivered());
hdrs.put("JMSRedelivered", s);
d = m.getJMSDestination();
if (d != null) {
if (d instanceof Queue) {
s = ((Queue)d).getQueueName();
} else {
s = ((Topic)d).getTopicName();
}
} else {
s = "";
}
hdrs.put("JMSReplyTo", s);
s = String.valueOf(m.getJMSTimestamp());
hdrs.put("JMSTimestamp", s);
s = m.getJMSType();
hdrs.put("JMSType", s);
return hdrs;
}
/**
* Takes a buffer of bytes and returns a hex dump. Each hex digit
* represents 4 bits. The hex digits are formatted into groups of
* 4 (2 bytes, 16 bits). Each line has 8 groups, so each line represents
* 128 bits.
*/
private static String toHexDump(byte[] buf, int length) {
// Buffer must be an even length
if (buf.length % 2 != 0) {
throw new IllegalArgumentException();
}
int value;
StringBuffer sb = new StringBuffer(buf.length * 2);
/* Assume buf is in network byte order (most significant byte
* is buf[0]). Convert two byte pairs to a short, then
* display as a hex string.
*/
int n = 0;
while (n < buf.length && n < length) {
value = buf[n + 1] & 0xFF; // Lower byte
value |= (buf[n] << 8) & 0xFF00; // Upper byte
String s = Integer.toHexString(value);
// Left bad with 0's
sb.append(pad[4 - s.length()]);
sb.append(s);
n += 2;
if (n % 16 == 0) {
sb.append("\n");
} else {
sb.append(" ");
}
}
return sb.toString();
}
/**
* Consumer that listens on the MQ monitoring topic that sends
* out lists of destination names. We use this to update the
* combo-box menu.
*/
public void onMessage(Message msg) {
try {
MapMessage mapMsg = (MapMessage)msg;
String type = mapMsg.getStringProperty("type");
if (type.equals(DEST_LIST_TOPIC_NAME)) {
String oneRow[] = new String[ 3 ];
TreeSet names = new TreeSet();
/*
* Extract list of destinations
*/
for (Enumeration e = mapMsg.getMapNames();
e.hasMoreElements();) {
String name = (String)e.nextElement();
Hashtable values = (Hashtable)mapMsg.getObject(name);
// Sort names by putting them into TreeSet
if (values.get("type").toString().equals("queue")) {
names.add((String)values.get("name"));
}
}
// Add sorted names to combo box menu
for (Iterator iter = names.iterator(); iter.hasNext();) {
addDestToMenu((String)iter.next());
}
} else {
System.err.println(
"Msg received: not destination list metric type");
}
} catch (Exception e) {
System.err.println("onMessage: Exception caught: " + e);
}
}
class OptionListener implements ItemListener {
public void itemStateChanged(ItemEvent e) {
System.out.println("ItemEvent");
}
}
class ExitListener implements ActionListener {
public void actionPerformed(ActionEvent e) {
shutdownJMS();
System.exit(0);
}
}
class BrowseListener implements ActionListener {
public void actionPerformed(ActionEvent e) {
doBrowse();
}
}
class TableMouseListener extends MouseAdapter {
public void mouseClicked(MouseEvent e) {
if (e.getClickCount() == 2) {
int row = msgTable.getSelectedRow();
MsgTable mt = (MsgTable)msgTable.getModel();
Message msg = mt.getMessageAtRow(row);
showDetails(msg, row);
}
}
}
class DetailsListener implements ActionListener {
public void actionPerformed(ActionEvent e) {
int row = msgTable.getSelectedRow();
if (row < 0) {
setFooter("Please select a message");
return;
}
MsgTable mt = (MsgTable)msgTable.getModel();
Message msg = mt.getMessageAtRow(row);
showDetails(msg, row);
}
}
/**
* A table of JMS Messages
*/
class MsgTable extends AbstractTableModel {
final String[] columnNames =
{"#", "Timestamp", "Type", "Mode", "Priority"};
SimpleDateFormat df =
new SimpleDateFormat("dd/MMM/yyyy:kk:mm:ss z");
LinkedList list = null;
public int getRowCount() {
if (list == null) {
return 0;
} else {
return list.size();
}
}
public int getColumnCount() {
return columnNames.length;
}
public String getColumnName(int column) {
return columnNames[column];
}
public Object getValueAt(int row, int column) {
if (list == null) {
return null;
}
Message m = (Message)list.get(row);
if (m == null) {
return "null";
}
try {
switch (column) {
case 0:
// Message number is the same as the row number
return new Integer(row);
case 1:
// Need to format into date/time
return df.format(new Date(m.getJMSTimestamp()));
case 2:
return QBrowser.messageType(m);
case 3:
// Delivery mode
int mode = m.getJMSDeliveryMode();
if (mode == DeliveryMode.PERSISTENT) {
return "P";
} else if (mode == DeliveryMode.NON_PERSISTENT) {
return "NP";
} else {
return String.valueOf(mode) + "?";
}
case 4:
// Priority
return new Integer(m.getJMSPriority());
default:
return "Bad column value: " + column;
}
} catch (JMSException e) {
return ("Error: " + e);
}
}
/**
* Load and enumeration of messages into the table
*/
int load (Enumeration e) {
if (e == null) {
return 0;
}
list = new LinkedList();
while (e.hasMoreElements()) {
list.add(e.nextElement());
}
fireTableDataChanged();
return list.size();
}
Message getMessageAtRow(int row) {
if (list == null) return null;
return((Message)list.get(row));
}
}
/**
* A panel with a text area that knows how to format and display
* a HashMap of values.
*/
class PropertyPanel extends JPanel {
JLabel label = null;
JTextArea textArea = null;
JScrollPane areaScrollPane = null;
PropertyPanel() {
super(true);
setBorder(BorderFactory.createEtchedBorder());
setLayout(new BorderLayout());
label = new JLabel();
textArea = new JTextArea();
textArea.setFont(new Font("Monospaced", Font.PLAIN, 12));
textArea.setLineWrap(true);
textArea.setWrapStyleWord(true);
areaScrollPane = new JScrollPane(textArea);
areaScrollPane.setVerticalScrollBarPolicy(
JScrollPane.VERTICAL_SCROLLBAR_ALWAYS);
areaScrollPane.setPreferredSize(new Dimension(500, 150));
add(BorderLayout.NORTH, label);
add(BorderLayout.CENTER, areaScrollPane);
}
void setTitle(String title) {
label.setText(title);
}
/**
* Display a HashMap in the text window
*/
void load(HashMap map) {
StringBuffer buf = new StringBuffer();
Set entries = map.entrySet();
Map.Entry entry = null;
Iterator iter = entries.iterator();
while (iter.hasNext()) {
entry = (Map.Entry)iter.next();
String key = entry.getKey().toString();
Object o = entry.getValue();
String value = "";
if (o != null) {
value = o.toString();
}
buf.append(pad(key + ": ", 20));
buf.append(value + "\n");
}
textArea.setText(buf.toString());
areaScrollPane.scrollRectToVisible(new Rectangle(0, 0, 1, 1));
}
/**
* Display text in the text window
*/
void load(String s) {
textArea.setText(s);
}
/**
* Pad a string to the specified width, right justified.
* If the string is longer than the width you get back the
* original string.
*/
String pad(String s, int width) {
// Very inefficient, but we don't care
StringBuffer sb = new StringBuffer();
int padding = width - s.length();
if (padding <= 0) {
return s;
}
while (padding > 0) {
sb.append(" ");
padding--;
}
sb.append(s);
return sb.toString();
}
}
}
Related examples in the same category
| 1. | The mqping utility is similar to the Unix ping utility in some regards | | |
| 2. | This example illustrates how JMS (Java Message Service) API can be used in a Java applet |  | |
| 3. | This example illustrates how JMS can be used to create a simple chat application | | |
| 4. | The UniversalClient example is a basic 'client' application that uses the JMS 1.1 APIs | | |
| 5. | This example is a simple JMS client application | | |
| 6. | Demonstrates a simple end-to-end "Hello World" JMS example that can be compiled and run with the Sun Java(tm) System Message Queue product | | |
| 7. | The BrokerMetrics example is a JMS application that monitors the Sun Java(tm) System Message Queue broker | | |
| 8. | The DestListMetrics example is a JMS application that monitors the destinations on a Sun Java(tm) System Message Queue broker | | |
| 9. | The DestMetrics example is a JMS application that monitors a destination on a Sun Java(tm) System Message Queue broker | | |
| 10. | The VMMetrics example is a JMS application that monitors the Java VM used by the Sun Java(tm) System Message Queue broker | | |
| 11. | MQ Cluster Monitor | | |
| 12. | The TopicSelectors class demonstrates the use of multiple subscribers and message selectors | | |
| 13. | A message will not be acknowledged until processing of it is complete | | |
| 14. | Reads a textfile, creates a BytesMessage from it, then reads the message | | |
| 15. | A durable subscription is active even when the subscriber is not active | | |
| 16. | Creates and then reads a StreamMessage and a BytesMessage | | |
| 17. | Creates and reads messages in all supported JMS message formats: BytesMessage, TextMessage, MapMessage, StreamMessage, and ObjectMessage | | |
| 18. | The use of message header fields | | |
| 19. | Demonstrates that mutable objects are copied, not passed by reference, when you use them to create message objects | | |
| 20. | A simple implementation of a request/reply message exchange | | |
| 21. | Sends several messages to a queue | | |
| 22. | Fetches one or more messages from a queue using synchronous message delivery | | |
| 23. | The simplest form of the publish/subscribe model: the producer publishes a message, and the consumer reads it using a synchronous receive | | |
| 24. | Demonstrates the use of transactions in a JMS application | | |
| 25. | Creates a Producer and a Consumer objects (Producer and Consumer classes are defined in this file) | | |
| 26. | Fetches one or more messages from a queue using asynchronous message delivery | | |
| 27. | The use of a message listener in the publish/subscribe model. The producer publishes several messages, and the consumer reads them asynchronously | | |