0N/A/*
2362N/A * Copyright (c) 2004, Oracle and/or its affiliates. All rights reserved.
0N/A *
0N/A * Redistribution and use in source and binary forms, with or without
0N/A * modification, are permitted provided that the following conditions
0N/A * are met:
0N/A *
0N/A * - Redistributions of source code must retain the above copyright
0N/A * notice, this list of conditions and the following disclaimer.
0N/A *
0N/A * - Redistributions in binary form must reproduce the above copyright
0N/A * notice, this list of conditions and the following disclaimer in the
0N/A * documentation and/or other materials provided with the distribution.
0N/A *
2362N/A * - Neither the name of Oracle nor the names of its
0N/A * contributors may be used to endorse or promote products derived
0N/A * from this software without specific prior written permission.
0N/A *
0N/A * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
0N/A * IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
0N/A * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
0N/A * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
0N/A * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
0N/A * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
0N/A * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
0N/A * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
0N/A * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
0N/A * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
0N/A * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
0N/A */
0N/A
0N/A/*
4378N/A * This source code is provided to illustrate the usage of a given feature
4378N/A * or technique and has been deliberately simplified. Additional steps
4378N/A * required for a production-quality application, such as security checks,
4378N/A * input validation and proper error handling, might not be present in
4378N/A * this sample code.
4378N/A */
4378N/A
4378N/A
4378N/A/*
0N/A */
0N/A
0N/Aimport javax.management.*;
0N/Aimport javax.management.remote.*;
0N/Aimport java.io.IOException;
0N/Aimport java.net.MalformedURLException;
0N/A
0N/A/**
0N/A * This VerboseGC class demonstrates the capability to get
0N/A * the garbage collection statistics and memory usage remotely.
0N/A */
0N/Apublic class VerboseGC {
0N/A private MBeanServerConnection server;
0N/A private JMXConnector jmxc;
0N/A public VerboseGC(String hostname, int port) {
0N/A System.out.println("Connecting to " + hostname + ":" + port);
0N/A
0N/A // Create an RMI connector client and connect it to
0N/A // the RMI connector server
0N/A String urlPath = "/jndi/rmi://" + hostname + ":" + port + "/jmxrmi";
0N/A connect(urlPath);
0N/A }
0N/A
0N/A public void dump(long interval, long samples) {
0N/A try {
0N/A PrintGCStat pstat = new PrintGCStat(server);
0N/A for (int i = 0; i < samples; i++) {
0N/A pstat.printVerboseGc();
0N/A try {
0N/A Thread.sleep(interval);
0N/A } catch (InterruptedException e) {
0N/A System.exit(1);
0N/A }
0N/A }
0N/A } catch (IOException e) {
0N/A System.err.println("\nCommunication error: " + e.getMessage());
0N/A System.exit(1);
0N/A }
0N/A }
0N/A
0N/A /**
0N/A * Connect to a JMX agent of a given URL.
0N/A */
0N/A private void connect(String urlPath) {
0N/A try {
0N/A JMXServiceURL url = new JMXServiceURL("rmi", "", 0, urlPath);
0N/A this.jmxc = JMXConnectorFactory.connect(url);
0N/A this.server = jmxc.getMBeanServerConnection();
0N/A } catch (MalformedURLException e) {
0N/A // should not reach here
0N/A } catch (IOException e) {
0N/A System.err.println("\nCommunication error: " + e.getMessage());
0N/A System.exit(1);
0N/A }
0N/A }
0N/A
0N/A public static void main(String[] args) {
0N/A if (args.length < 1) {
0N/A usage();
0N/A }
0N/A
0N/A String hostname = "";
0N/A int port = -1;
0N/A long interval = 5000; // default is 5 second interval
0N/A long mins = 5;
4123N/A for (String arg: args) {
4123N/A if (arg.startsWith("-")) {
0N/A if (arg.equals("-h") ||
0N/A arg.equals("-help") ||
0N/A arg.equals("-?")) {
0N/A usage();
0N/A } else if (arg.startsWith("-interval=")) {
0N/A try {
0N/A interval = Integer.parseInt(arg.substring(10)) * 1000;
0N/A } catch (NumberFormatException ex) {
0N/A usage();
0N/A }
0N/A } else if (arg.startsWith("-duration=")) {
0N/A try {
0N/A mins = Integer.parseInt(arg.substring(10));
0N/A } catch (NumberFormatException ex) {
0N/A usage();
0N/A }
0N/A } else {
0N/A // Unknown switch
0N/A System.err.println("Unrecognized option: " + arg);
0N/A usage();
0N/A }
0N/A } else {
0N/A String[] arg2 = arg.split(":");
0N/A if (arg2.length != 2) {
0N/A usage();
0N/A }
0N/A hostname = arg2[0];
0N/A try {
0N/A port = Integer.parseInt(arg2[1]);
0N/A } catch (NumberFormatException x) {
0N/A usage();
0N/A }
0N/A if (port < 0) {
0N/A usage();
0N/A }
0N/A }
0N/A }
0N/A
0N/A // get full thread dump and perform deadlock detection
0N/A VerboseGC vgc = new VerboseGC(hostname, port);
0N/A long samples = (mins * 60 * 1000) / interval;
0N/A vgc.dump(interval, samples);
0N/A
0N/A }
0N/A
0N/A private static void usage() {
0N/A System.out.print("Usage: java VerboseGC <hostname>:<port> ");
0N/A System.out.println(" [-interval=seconds] [-duration=minutes]");
0N/A }
0N/A}