| /* |
| * Copyright (c) 2004, 2011, 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 javax.management.*; |
| import javax.management.remote.*; |
| import java.io.IOException; |
| import java.net.MalformedURLException; |
| |
| /** |
| * This VerboseGC class demonstrates the capability to get |
| * the garbage collection statistics and memory usage remotely. |
| */ |
| public class VerboseGC { |
| private MBeanServerConnection server; |
| private JMXConnector jmxc; |
| public VerboseGC(String hostname, int port) { |
| System.out.println("Connecting to " + hostname + ":" + port); |
| |
| // Create an RMI connector client and connect it to |
| // the RMI connector server |
| String urlPath = "/jndi/rmi://" + hostname + ":" + port + "/jmxrmi"; |
| connect(urlPath); |
| } |
| |
| public void dump(long interval, long samples) { |
| try { |
| PrintGCStat pstat = new PrintGCStat(server); |
| for (int i = 0; i < samples; i++) { |
| pstat.printVerboseGc(); |
| try { |
| Thread.sleep(interval); |
| } catch (InterruptedException e) { |
| System.exit(1); |
| } |
| } |
| } catch (IOException e) { |
| System.err.println("\nCommunication error: " + e.getMessage()); |
| System.exit(1); |
| } |
| } |
| |
| /** |
| * Connect to a JMX agent of a given URL. |
| */ |
| private void connect(String urlPath) { |
| try { |
| JMXServiceURL url = new JMXServiceURL("rmi", "", 0, urlPath); |
| this.jmxc = JMXConnectorFactory.connect(url); |
| this.server = jmxc.getMBeanServerConnection(); |
| } catch (MalformedURLException e) { |
| // should not reach here |
| } catch (IOException e) { |
| System.err.println("\nCommunication error: " + e.getMessage()); |
| System.exit(1); |
| } |
| } |
| |
| public static void main(String[] args) { |
| if (args.length < 1) { |
| usage(); |
| } |
| |
| String hostname = ""; |
| int port = -1; |
| long interval = 5000; // default is 5 second interval |
| long mins = 5; |
| for (String arg: args) { |
| if (arg.startsWith("-")) { |
| if (arg.equals("-h") || |
| arg.equals("-help") || |
| arg.equals("-?")) { |
| usage(); |
| } else if (arg.startsWith("-interval=")) { |
| try { |
| interval = Integer.parseInt(arg.substring(10)) * 1000; |
| } catch (NumberFormatException ex) { |
| usage(); |
| } |
| } else if (arg.startsWith("-duration=")) { |
| try { |
| mins = Integer.parseInt(arg.substring(10)); |
| } catch (NumberFormatException ex) { |
| usage(); |
| } |
| } else { |
| // Unknown switch |
| System.err.println("Unrecognized option: " + arg); |
| usage(); |
| } |
| } else { |
| String[] arg2 = arg.split(":"); |
| if (arg2.length != 2) { |
| usage(); |
| } |
| hostname = arg2[0]; |
| try { |
| port = Integer.parseInt(arg2[1]); |
| } catch (NumberFormatException x) { |
| usage(); |
| } |
| if (port < 0) { |
| usage(); |
| } |
| } |
| } |
| |
| // get full thread dump and perform deadlock detection |
| VerboseGC vgc = new VerboseGC(hostname, port); |
| long samples = (mins * 60 * 1000) / interval; |
| vgc.dump(interval, samples); |
| |
| } |
| |
| private static void usage() { |
| System.out.print("Usage: java VerboseGC <hostname>:<port> "); |
| System.out.println(" [-interval=seconds] [-duration=minutes]"); |
| } |
| } |