J. Duke | 319a3b9 | 2007-12-01 00:00:00 +0000 | [diff] [blame^] | 1 | /* |
| 2 | * Copyright 2004 Sun Microsystems, Inc. All Rights Reserved. |
| 3 | * |
| 4 | * Redistribution and use in source and binary forms, with or without |
| 5 | * modification, are permitted provided that the following conditions |
| 6 | * are met: |
| 7 | * |
| 8 | * - Redistributions of source code must retain the above copyright |
| 9 | * notice, this list of conditions and the following disclaimer. |
| 10 | * |
| 11 | * - Redistributions in binary form must reproduce the above copyright |
| 12 | * notice, this list of conditions and the following disclaimer in the |
| 13 | * documentation and/or other materials provided with the distribution. |
| 14 | * |
| 15 | * - Neither the name of Sun Microsystems nor the names of its |
| 16 | * contributors may be used to endorse or promote products derived |
| 17 | * from this software without specific prior written permission. |
| 18 | * |
| 19 | * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS |
| 20 | * IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, |
| 21 | * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR |
| 22 | * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR |
| 23 | * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, |
| 24 | * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, |
| 25 | * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR |
| 26 | * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF |
| 27 | * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING |
| 28 | * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS |
| 29 | * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| 30 | */ |
| 31 | |
| 32 | /* |
| 33 | */ |
| 34 | |
| 35 | import javax.management.*; |
| 36 | import javax.management.remote.*; |
| 37 | import java.io.IOException; |
| 38 | import java.net.MalformedURLException; |
| 39 | |
| 40 | /** |
| 41 | * This VerboseGC class demonstrates the capability to get |
| 42 | * the garbage collection statistics and memory usage remotely. |
| 43 | */ |
| 44 | public class VerboseGC { |
| 45 | private MBeanServerConnection server; |
| 46 | private JMXConnector jmxc; |
| 47 | public VerboseGC(String hostname, int port) { |
| 48 | System.out.println("Connecting to " + hostname + ":" + port); |
| 49 | |
| 50 | // Create an RMI connector client and connect it to |
| 51 | // the RMI connector server |
| 52 | String urlPath = "/jndi/rmi://" + hostname + ":" + port + "/jmxrmi"; |
| 53 | connect(urlPath); |
| 54 | } |
| 55 | |
| 56 | public void dump(long interval, long samples) { |
| 57 | try { |
| 58 | PrintGCStat pstat = new PrintGCStat(server); |
| 59 | for (int i = 0; i < samples; i++) { |
| 60 | pstat.printVerboseGc(); |
| 61 | try { |
| 62 | Thread.sleep(interval); |
| 63 | } catch (InterruptedException e) { |
| 64 | System.exit(1); |
| 65 | } |
| 66 | } |
| 67 | } catch (IOException e) { |
| 68 | System.err.println("\nCommunication error: " + e.getMessage()); |
| 69 | System.exit(1); |
| 70 | } |
| 71 | } |
| 72 | |
| 73 | /** |
| 74 | * Connect to a JMX agent of a given URL. |
| 75 | */ |
| 76 | private void connect(String urlPath) { |
| 77 | try { |
| 78 | JMXServiceURL url = new JMXServiceURL("rmi", "", 0, urlPath); |
| 79 | this.jmxc = JMXConnectorFactory.connect(url); |
| 80 | this.server = jmxc.getMBeanServerConnection(); |
| 81 | } catch (MalformedURLException e) { |
| 82 | // should not reach here |
| 83 | } catch (IOException e) { |
| 84 | System.err.println("\nCommunication error: " + e.getMessage()); |
| 85 | System.exit(1); |
| 86 | } |
| 87 | } |
| 88 | |
| 89 | public static void main(String[] args) { |
| 90 | if (args.length < 1) { |
| 91 | usage(); |
| 92 | } |
| 93 | |
| 94 | String hostname = ""; |
| 95 | int port = -1; |
| 96 | long interval = 5000; // default is 5 second interval |
| 97 | long mins = 5; |
| 98 | for (int argIndex = 0; argIndex < args.length; argIndex++) { |
| 99 | String arg = args[argIndex]; |
| 100 | if (args[argIndex].startsWith("-")) { |
| 101 | if (arg.equals("-h") || |
| 102 | arg.equals("-help") || |
| 103 | arg.equals("-?")) { |
| 104 | usage(); |
| 105 | } else if (arg.startsWith("-interval=")) { |
| 106 | try { |
| 107 | interval = Integer.parseInt(arg.substring(10)) * 1000; |
| 108 | } catch (NumberFormatException ex) { |
| 109 | usage(); |
| 110 | } |
| 111 | } else if (arg.startsWith("-duration=")) { |
| 112 | try { |
| 113 | mins = Integer.parseInt(arg.substring(10)); |
| 114 | } catch (NumberFormatException ex) { |
| 115 | usage(); |
| 116 | } |
| 117 | } else { |
| 118 | // Unknown switch |
| 119 | System.err.println("Unrecognized option: " + arg); |
| 120 | usage(); |
| 121 | } |
| 122 | } else { |
| 123 | String[] arg2 = arg.split(":"); |
| 124 | if (arg2.length != 2) { |
| 125 | usage(); |
| 126 | } |
| 127 | hostname = arg2[0]; |
| 128 | try { |
| 129 | port = Integer.parseInt(arg2[1]); |
| 130 | } catch (NumberFormatException x) { |
| 131 | usage(); |
| 132 | } |
| 133 | if (port < 0) { |
| 134 | usage(); |
| 135 | } |
| 136 | } |
| 137 | } |
| 138 | |
| 139 | // get full thread dump and perform deadlock detection |
| 140 | VerboseGC vgc = new VerboseGC(hostname, port); |
| 141 | long samples = (mins * 60 * 1000) / interval; |
| 142 | vgc.dump(interval, samples); |
| 143 | |
| 144 | } |
| 145 | |
| 146 | private static void usage() { |
| 147 | System.out.print("Usage: java VerboseGC <hostname>:<port> "); |
| 148 | System.out.println(" [-interval=seconds] [-duration=minutes]"); |
| 149 | } |
| 150 | } |