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41 import javax.management.*;
42 import javax.management.remote.*;
43 import java.io.IOException  ;
44 import java.net.MalformedURLException ;
45
46
50 public class VerboseGC {
51 private MBeanServerConnection server;
52 private JMXConnector jmxc;
53 public VerboseGC(String hostname, int port) {
54 System.out.println("Connecting to " + hostname + ":" + port);
55
56 String urlPath = "/jndi/rmi://" + hostname + ":" + port + "/jmxrmi";
59 connect(urlPath);
60 }
61
62 public void dump(long interval, long samples) {
63 try {
64 PrintGCStat pstat = new PrintGCStat(server);
65 for (int i = 0; i < samples; i++) {
66 pstat.printVerboseGc();
67 try {
68 Thread.sleep(interval);
69 } catch (InterruptedException e) {
70 System.exit(1);
71 }
72 }
73 } catch (IOException e) {
74 System.err.println("\nCommunication error: " + e.getMessage());
75 System.exit(1);
76 }
77 }
78
79
82 private void connect(String urlPath) {
83 try {
84 JMXServiceURL url = new JMXServiceURL("rmi", "", 0, urlPath);
85 this.jmxc = JMXConnectorFactory.connect(url);
86 this.server = jmxc.getMBeanServerConnection();
87 } catch (MalformedURLException e) {
88 } catch (IOException e) {
90 System.err.println("\nCommunication error: " + e.getMessage());
91 System.exit(1);
92 }
93 }
94
95 public static void main(String [] args) {
96 if (args.length < 1) {
97 usage();
98 }
99
100 String hostname = "";
101 int port = -1;
102 long interval = 5000; long mins = 5;
104 for (int argIndex = 0; argIndex < args.length; argIndex++) {
105 String arg = args[argIndex];
106 if (args[argIndex].startsWith("-")) {
107 if (arg.equals("-h") ||
108 arg.equals("-help") ||
109 arg.equals("-?")) {
110 usage();
111 } else if (arg.startsWith("-interval=")) {
112 try {
113 interval = Integer.parseInt(arg.substring(10)) * 1000;
114 } catch (NumberFormatException ex) {
115 usage();
116 }
117 } else if (arg.startsWith("-duration=")) {
118 try {
119 mins = Integer.parseInt(arg.substring(10));
120 } catch (NumberFormatException ex) {
121 usage();
122 }
123 } else {
124 System.err.println("Unrecognized option: " + arg);
126 usage();
127 }
128 } else {
129 String [] arg2 = arg.split(":");
130 if (arg2.length != 2) {
131 usage();
132 }
133 hostname = arg2[0];
134 try {
135 port = Integer.parseInt(arg2[1]);
136 } catch (NumberFormatException x) {
137 usage();
138 }
139 if (port < 0) {
140 usage();
141 }
142 }
143 }
144
145 VerboseGC vgc = new VerboseGC(hostname, port);
147 long samples = (mins * 60 * 1000) / interval;
148 vgc.dump(interval, samples);
149
150 }
151
152 private static void usage() {
153 System.out.print("Usage: java VerboseGC <hostname>:<port> ");
154 System.out.println(" [-interval=seconds] [-duration=minutes]");
155 }
156 }
157 |
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