1   /*
2    * Licensed to the Apache Software Foundation (ASF) under one
3    * or more contributor license agreements.  See the NOTICE file
4    * distributed with this work for additional information
5    * regarding copyright ownership.  The ASF licenses this file
6    * to you under the Apache License, Version 2.0 (the
7    * "License"); you may not use this file except in compliance
8    * with the License.  You may obtain a copy of the License at
9    *
10   *   http://www.apache.org/licenses/LICENSE-2.0
11   *
12   * Unless required by applicable law or agreed to in writing,
13   * software distributed under the License is distributed on an
14   * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
15   * KIND, either express or implied.  See the License for the
16   * specific language governing permissions and limitations
17   * under the License.
18   */
19  package org.apache.mina.transport.vmpipe;
20  
21  import java.lang.management.ManagementFactory;
22  import java.lang.management.ThreadInfo;
23  import java.lang.management.ThreadMXBean;
24  import java.util.concurrent.CountDownLatch;
25  import java.util.concurrent.TimeUnit;
26  import java.util.concurrent.atomic.AtomicReference;
27  
28  import org.apache.mina.common.ConnectFuture;
29  import org.apache.mina.common.IoAcceptor;
30  import org.apache.mina.common.IoAcceptorConfig;
31  import org.apache.mina.common.IoConnector;
32  import org.apache.mina.common.IoHandlerAdapter;
33  import org.apache.mina.common.IoSession;
34  import org.apache.mina.common.ThreadModel;
35  
36  import junit.framework.TestCase;
37  
38  /**
39   * @author Apache Mina Project (dev@mina.apache.org)
40   * @version $Rev: $, $Date:  $
41   */
42  public class VmPipeSessionCrossCommunicationTest extends TestCase {
43      public void testOneSessionTalkingBackAndForthDoesNotDeadlock() throws Exception {
44          final VmPipeAddress address = new VmPipeAddress( 1 );
45          final IoConnector connector = new VmPipeConnector();
46          final AtomicReference<IoSession> c1 = new AtomicReference<IoSession>();
47          final CountDownLatch latch = new CountDownLatch( 1 );
48          final CountDownLatch messageCount = new CountDownLatch( 2 );
49          IoAcceptor acceptor = new VmPipeAcceptor();
50  
51          acceptor.bind( address, new IoHandlerAdapter() {
52              @Override
53              public void messageReceived( IoSession session, Object message ) throws Exception {
54                  System.out.println( Thread.currentThread().getName() + ": " + message );
55  
56                  if ( "start".equals( message ) ) {
57                      session.write( "open new" );
58                  } else if ( "re-use c1".equals( message ) ) {
59                      session.write( "tell me something on c1 now" );
60                  } else if ( ( (String) message ).startsWith( "please don't deadlock" ) ) {
61                      messageCount.countDown();
62                  } else {
63                      fail( "unexpected message received " + message );
64                  }
65              }
66          } );
67  
68          connector.getDefaultConfig().setThreadModel( ThreadModel.MANUAL );
69  
70          ConnectFuture future = connector.connect( address, new IoHandlerAdapter() {
71              @Override
72              public void messageReceived( IoSession session, Object message ) throws Exception {
73                  System.out.println( Thread.currentThread().getName() + ": " + message );
74                  
75                  if ( "open new".equals( message ) ) {
76                      System.out.println( "opening c2 from " + Thread.currentThread().getName() );
77  
78                      ConnectFuture c2Future = connector.connect( address, new IoHandlerAdapter() {
79                          @Override
80                          public void sessionOpened( IoSession session ) throws Exception {
81                              session.write( "re-use c1" );
82                          }
83  
84                          @Override
85                          public void messageReceived( IoSession session, Object message ) throws Exception {
86                              System.out.println( Thread.currentThread().getName() + ": " + message );
87  
88                              if ( "tell me something on c1 now".equals( message ) ) {
89                                  latch.countDown();
90                                  c1.get().write( "please don't deadlock via c1" );
91                              } else {
92                                  fail( "unexpected message received " + message );
93                              }
94                          }
95                      } );
96  
97                      c2Future.join();
98  
99                      latch.await();
100 
101                     c2Future.getSession().write( "please don't deadlock via c2" );
102                 } else {
103                     fail( "unexpeced message received " + message );
104                 }
105             }
106         } );
107 
108         future.join();
109 
110         c1.set( future.getSession() );
111         c1.get().write( "start" );
112 
113         ThreadMXBean threadMXBean = ManagementFactory.getThreadMXBean();
114 
115         while ( !messageCount.await( 100, TimeUnit.MILLISECONDS ) ) {
116             long[] threads = threadMXBean.findMonitorDeadlockedThreads();
117 
118             if ( null != threads ) {
119                 StringBuffer sb = new StringBuffer( 256 );
120                 ThreadInfo[] infos = threadMXBean.getThreadInfo( threads, Integer.MAX_VALUE );
121 
122                 for ( ThreadInfo info : infos ) {
123                     sb.append( info.getThreadName() )
124                         .append( " blocked on " )
125                         .append( info.getLockName() )
126                         .append( " owned by " )
127                         .append( info.getLockOwnerName() )
128                         .append( "\n" );
129                 }
130 
131                 for ( ThreadInfo info : infos ) {
132                     sb.append( "\nStack for " ).append( info.getThreadName() ).append( "\n" );
133                     for ( StackTraceElement element : info.getStackTrace() ) {
134                         sb.append( "\t" ).append( element ).append( "\n" );
135                     }
136                 }
137 
138                 fail( "deadlocked! \n" + sb );
139             }
140         }
141 
142         ( (IoAcceptorConfig) acceptor.getDefaultConfig() ).setDisconnectOnUnbind( false );
143         acceptor.unbindAll();
144     }
145 }