/src/share/demo/management/JTop/JTop.java
Java | 375 lines | 217 code | 39 blank | 119 comment | 15 complexity | 4c33ac017e30454b72e4318c2980c823 MD5 | raw file
- /*
- * Copyright (c) 2005, 2006, 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.
- */
- /*
- *
- * Example of using the java.lang.management API to sort threads
- * by CPU usage.
- *
- * JTop class can be run as a standalone application.
- * It first establishs a connection to a target VM specified
- * by the given hostname and port number where the JMX agent
- * to be connected. It then polls for the thread information
- * and the CPU consumption of each thread to display every 2
- * seconds.
- *
- * It is also used by JTopPlugin which is a JConsolePlugin
- * that can be used with JConsole (see README.txt). The JTop
- * GUI will be added as a JConsole tab by the JTop plugin.
- *
- * @see com.sun.tools.jconsole.JConsolePlugin
- *
- * @author Mandy Chung
- */
- import java.lang.management.*;
- import javax.management.*;
- import javax.management.remote.*;
- import java.io.IOException;
- import java.util.ArrayList;
- import java.util.Collections;
- import java.util.List;
- import java.util.Map;
- import java.util.Set;
- import java.util.SortedMap;
- import java.util.Timer;
- import java.util.TimerTask;
- import java.util.TreeMap;
- import java.util.concurrent.ExecutionException;
- import java.text.NumberFormat;
- import java.net.MalformedURLException;
- import static java.lang.management.ManagementFactory.*;
- import java.awt.*;
- import javax.swing.*;
- import javax.swing.border.*;
- import javax.swing.table.*;
- /**
- * JTop is a JPanel to display thread's name, CPU time, and its state
- * in a table.
- */
- public class JTop extends JPanel {
- private static final long serialVersionUID = -1499762160973870696L;
- private MBeanServerConnection server;
- private ThreadMXBean tmbean;
- private MyTableModel tmodel;
- public JTop() {
- super(new GridLayout(1,0));
- tmodel = new MyTableModel();
- JTable table = new JTable(tmodel);
- table.setPreferredScrollableViewportSize(new Dimension(500, 300));
- // Set the renderer to format Double
- table.setDefaultRenderer(Double.class, new DoubleRenderer());
- // Add some space
- table.setIntercellSpacing(new Dimension(6,3));
- table.setRowHeight(table.getRowHeight() + 4);
- // Create the scroll pane and add the table to it.
- JScrollPane scrollPane = new JScrollPane(table);
- // Add the scroll pane to this panel.
- add(scrollPane);
- }
- // Set the MBeanServerConnection object for communicating
- // with the target VM
- public void setMBeanServerConnection(MBeanServerConnection mbs) {
- this.server = mbs;
- try {
- this.tmbean = newPlatformMXBeanProxy(server,
- THREAD_MXBEAN_NAME,
- ThreadMXBean.class);
- } catch (IOException e) {
- e.printStackTrace();
- }
- if (!tmbean.isThreadCpuTimeSupported()) {
- System.err.println("This VM does not support thread CPU time monitoring");
- } else {
- tmbean.setThreadCpuTimeEnabled(true);
- }
- }
- class MyTableModel extends AbstractTableModel {
- private static final long serialVersionUID = -7877310288576779514L;
- private String[] columnNames = {"ThreadName",
- "CPU(sec)",
- "State"};
- // List of all threads. The key of each entry is the CPU time
- // and its value is the ThreadInfo object with no stack trace.
- private List<Map.Entry<Long, ThreadInfo>> threadList =
- Collections.emptyList();
- public MyTableModel() {
- }
- @Override
- public int getColumnCount() {
- return columnNames.length;
- }
- @Override
- public int getRowCount() {
- return threadList.size();
- }
- @Override
- public String getColumnName(int col) {
- return columnNames[col];
- }
- @Override
- public Object getValueAt(int row, int col) {
- Map.Entry<Long, ThreadInfo> me = threadList.get(row);
- switch (col) {
- case 0 :
- // Column 0 shows the thread name
- return me.getValue().getThreadName();
- case 1 :
- // Column 1 shows the CPU usage
- long ns = me.getKey().longValue();
- double sec = ns / 1000000000;
- return new Double(sec);
- case 2 :
- // Column 2 shows the thread state
- return me.getValue().getThreadState();
- default:
- return null;
- }
- }
- @Override
- public Class<?> getColumnClass(int c) {
- return getValueAt(0, c).getClass();
- }
- void setThreadList(List<Map.Entry<Long, ThreadInfo>> list) {
- threadList = list;
- }
- }
- /**
- * Get the thread list with CPU consumption and the ThreadInfo
- * for each thread sorted by the CPU time.
- */
- private List<Map.Entry<Long, ThreadInfo>> getThreadList() {
- // Get all threads and their ThreadInfo objects
- // with no stack trace
- long[] tids = tmbean.getAllThreadIds();
- ThreadInfo[] tinfos = tmbean.getThreadInfo(tids);
- // build a map with key = CPU time and value = ThreadInfo
- SortedMap<Long, ThreadInfo> map = new TreeMap<Long, ThreadInfo>();
- for (int i = 0; i < tids.length; i++) {
- long cpuTime = tmbean.getThreadCpuTime(tids[i]);
- // filter out threads that have been terminated
- if (cpuTime != -1 && tinfos[i] != null) {
- map.put(new Long(cpuTime), tinfos[i]);
- }
- }
- // build the thread list and sort it with CPU time
- // in decreasing order
- Set<Map.Entry<Long, ThreadInfo>> set = map.entrySet();
- List<Map.Entry<Long, ThreadInfo>> list =
- new ArrayList<Map.Entry<Long, ThreadInfo>>(set);
- Collections.reverse(list);
- return list;
- }
- /**
- * Format Double with 4 fraction digits
- */
- class DoubleRenderer extends DefaultTableCellRenderer {
- private static final long serialVersionUID = 1704639497162584382L;
- NumberFormat formatter;
- public DoubleRenderer() {
- super();
- setHorizontalAlignment(JLabel.RIGHT);
- }
- @Override
- public void setValue(Object value) {
- if (formatter==null) {
- formatter = NumberFormat.getInstance();
- formatter.setMinimumFractionDigits(4);
- }
- setText((value == null) ? "" : formatter.format(value));
- }
- }
- // SwingWorker responsible for updating the GUI
- //
- // It first gets the thread and CPU usage information as a
- // background task done by a worker thread so that
- // it will not block the event dispatcher thread.
- //
- // When the worker thread finishes, the event dispatcher
- // thread will invoke the done() method which will update
- // the UI.
- class Worker extends SwingWorker<List<Map.Entry<Long, ThreadInfo>>,Object> {
- private MyTableModel tmodel;
- Worker(MyTableModel tmodel) {
- this.tmodel = tmodel;
- }
- // Get the current thread info and CPU time
- @Override
- public List<Map.Entry<Long, ThreadInfo>> doInBackground() {
- return getThreadList();
- }
- // fire table data changed to trigger GUI update
- // when doInBackground() is finished
- @Override
- protected void done() {
- try {
- // Set table model with the new thread list
- tmodel.setThreadList(get());
- // refresh the table model
- tmodel.fireTableDataChanged();
- } catch (InterruptedException e) {
- } catch (ExecutionException e) {
- }
- }
- }
- // Return a new SwingWorker for UI update
- public SwingWorker<?,?> newSwingWorker() {
- return new Worker(tmodel);
- }
- public static void main(String[] args) throws Exception {
- // Validate the input arguments
- if (args.length != 1) {
- usage();
- }
- String[] arg2 = args[0].split(":");
- if (arg2.length != 2) {
- usage();
- }
- String hostname = arg2[0];
- int port = -1;
- try {
- port = Integer.parseInt(arg2[1]);
- } catch (NumberFormatException x) {
- usage();
- }
- if (port < 0) {
- usage();
- }
- // Create the JTop Panel
- final JTop jtop = new JTop();
- // Set up the MBeanServerConnection to the target VM
- MBeanServerConnection server = connect(hostname, port);
- jtop.setMBeanServerConnection(server);
- // A timer task to update GUI per each interval
- TimerTask timerTask = new TimerTask() {
- @Override
- public void run() {
- // Schedule the SwingWorker to update the GUI
- jtop.newSwingWorker().execute();
- }
- };
- // Create the standalone window with JTop panel
- // by the event dispatcher thread
- SwingUtilities.invokeAndWait(new Runnable() {
- @Override
- public void run() {
- createAndShowGUI(jtop);
- }
- });
- // refresh every 2 seconds
- Timer timer = new Timer("JTop Sampling thread");
- timer.schedule(timerTask, 0, 2000);
- }
- // Establish a connection with the remote application
- //
- // You can modify the urlPath to the address of the JMX agent
- // of your application if it has a different URL.
- //
- // You can also modify the following code to take
- // username and password for client authentication.
- private static MBeanServerConnection connect(String hostname, int port) {
- // Create an RMI connector client and connect it to
- // the RMI connector server
- String urlPath = "/jndi/rmi://" + hostname + ":" + port + "/jmxrmi";
- MBeanServerConnection server = null;
- try {
- JMXServiceURL url = new JMXServiceURL("rmi", "", 0, urlPath);
- JMXConnector jmxc = JMXConnectorFactory.connect(url);
- server = jmxc.getMBeanServerConnection();
- } catch (MalformedURLException e) {
- // should not reach here
- } catch (IOException e) {
- System.err.println("\nCommunication error: " + e.getMessage());
- System.exit(1);
- }
- return server;
- }
- private static void usage() {
- System.out.println("Usage: java JTop <hostname>:<port>");
- System.exit(1);
- }
- /**
- * Create the GUI and show it. For thread safety,
- * this method should be invoked from the
- * event-dispatching thread.
- */
- private static void createAndShowGUI(JPanel jtop) {
- // Create and set up the window.
- JFrame frame = new JFrame("JTop");
- frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
- // Create and set up the content pane.
- JComponent contentPane = (JComponent) frame.getContentPane();
- contentPane.add(jtop, BorderLayout.CENTER);
- contentPane.setOpaque(true); //content panes must be opaque
- contentPane.setBorder(new EmptyBorder(12, 12, 12, 12));
- frame.setContentPane(contentPane);
- // Display the window.
- frame.pack();
- frame.setVisible(true);
- }
- }