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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
40
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 }