1 /*
   2  * Copyright (c) 2004, Oracle and/or its affiliates. All rights reserved.
   3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   4  *
   5  * This code is free software; you can redistribute it and/or modify it
   6  * under the terms of the GNU General Public License version 2 only, as
   7  * published by the Free Software Foundation.
   8  *
   9  * This code is distributed in the hope that it will be useful, but WITHOUT
  10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  12  * version 2 for more details (a copy is included in the LICENSE file that
  13  * accompanied this code).
  14  *
  15  * You should have received a copy of the GNU General Public License version
  16  * 2 along with this work; if not, write to the Free Software Foundation,
  17  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  18  *
  19  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  20  * or visit www.oracle.com if you need additional information or have any
  21  * questions.
  22  */
  23 
  24 /*
  25  * @test
  26  * @bug 5039210
  27  * @summary test on a client notification deadlock.
  28  * @author Shanliang JIANG
  29  * @run clean DeadLockTest
  30  * @run build DeadLockTest
  31  * @run main DeadLockTest
  32  */
  33 
  34 import java.net.MalformedURLException;
  35 import java.io.IOException;
  36 import java.util.HashMap;
  37 
  38 import javax.management.*;
  39 import javax.management.remote.*;
  40 
  41 public class DeadLockTest {
  42     private static final String[] protocols = {"rmi", "iiop", "jmxmp"};
  43     private static final MBeanServer mbs = MBeanServerFactory.createMBeanServer();
  44 
  45     public static void main(String[] args) {
  46         System.out.println(">>> test on a client notification deadlock.");
  47 
  48         boolean ok = true;
  49         for (int i = 0; i < protocols.length; i++) {
  50             try {
  51                 test(protocols[i]);
  52             } catch (Exception e) {
  53                 System.out.println(">>> Test failed for " + protocols[i]);
  54                 e.printStackTrace(System.out);
  55             }
  56         }
  57 
  58         System.out.println(">>> Test passed");
  59     }
  60 
  61     private static void test(String proto)
  62             throws Exception {
  63         System.out.println(">>> Test for protocol " + proto);
  64 
  65         JMXServiceURL u = null;
  66         JMXConnectorServer server = null;
  67 
  68         HashMap env = new HashMap(2);
  69         // server will close a client connection after 1 second
  70         env.put("jmx.remote.x.server.connection.timeout", "1000");
  71 
  72         // disable the client ping
  73         env.put("jmx.remote.x.client.connection.check.period", "0");
  74 
  75         try {
  76             u = new JMXServiceURL(proto, null, 0);
  77             server = JMXConnectorServerFactory.newJMXConnectorServer(u, env, mbs);
  78         } catch (MalformedURLException e) {
  79             System.out.println(">>> Skipping unsupported URL " + proto);
  80         }
  81 
  82         server.start();
  83 
  84         JMXServiceURL addr = server.getAddress();
  85 
  86         long st = 2000;
  87         MyListener myListener;
  88 
  89         // a cycle to make sure that we test the blocking problem.
  90         do {
  91             JMXConnector client = JMXConnectorFactory.connect(addr, env);
  92             MBeanServerConnection conn = client.getMBeanServerConnection();
  93             myListener = new MyListener(conn);
  94             client.addConnectionNotificationListener(myListener, null, null);
  95 
  96             // wait the server to close the client connection
  97             Thread.sleep(st);
  98 
  99             // makes the listener to do a remote request via the connection
 100             // which should be closed by the server.
 101             conn.getDefaultDomain();
 102 
 103             // allow the listner to have time to work
 104             Thread.sleep(100);
 105 
 106             // get a closed notif, should no block.
 107             client.close();
 108             Thread.sleep(100);
 109 
 110             st += 2000;
 111 
 112         } while(!myListener.isDone());
 113 
 114         server.stop();
 115     }
 116 
 117     private static class MyListener implements NotificationListener {
 118         public MyListener(MBeanServerConnection conn) {
 119             this.conn = conn;
 120         }
 121 
 122         public void handleNotification(Notification n, Object h) {
 123             if (n instanceof JMXConnectionNotification) {
 124                 JMXConnectionNotification jcn = (JMXConnectionNotification)n;
 125                 final String type = jcn.getType();
 126                 System.out.println(">>> The listener receives notif with the type:"+type);
 127 
 128                 if (JMXConnectionNotification.CLOSED.equals(type) ||
 129                     JMXConnectionNotification.FAILED.equals(type)) {
 130 
 131                     synchronized(this) {
 132                         done = false;
 133                     }
 134 
 135                     try {
 136                         conn.getDefaultDomain();
 137                     } catch (IOException ioe) {
 138                         // Greate !
 139                     }
 140 
 141                     synchronized(this) {
 142                         done = true;
 143                     }
 144 
 145                     System.out.println(">>> The listener is not blocked!");
 146                 }
 147             }
 148         }
 149 
 150         public boolean isDone() {
 151             synchronized(this) {
 152                 return done;
 153             }
 154         }
 155 
 156         private boolean done = false;
 157         private MBeanServerConnection conn;
 158     }
 159 }