001/* 002 * Licensed to the Apache Software Foundation (ASF) under one 003 * or more contributor license agreements. See the NOTICE file 004 * distributed with this work for additional information 005 * regarding copyright ownership. The ASF licenses this file 006 * to you under the Apache License, Version 2.0 (the 007 * "License"); you may not use this file except in compliance 008 * with the License. You may obtain a copy of the License at 009 * 010 * http://www.apache.org/licenses/LICENSE-2.0 011 * 012 * Unless required by applicable law or agreed to in writing, 013 * software distributed under the License is distributed on an 014 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY 015 * KIND, either express or implied. See the License for the 016 * specific language governing permissions and limitations 017 * under the License. 018 */ 019package org.apache.mina.transport.vmpipe; 020 021import static org.junit.Assert.fail; 022 023import java.lang.management.ManagementFactory; 024import java.lang.management.ThreadInfo; 025import java.lang.management.ThreadMXBean; 026import java.util.concurrent.CountDownLatch; 027import java.util.concurrent.TimeUnit; 028import java.util.concurrent.atomic.AtomicReference; 029 030import org.apache.mina.core.future.ConnectFuture; 031import org.apache.mina.core.service.IoAcceptor; 032import org.apache.mina.core.service.IoConnector; 033import org.apache.mina.core.service.IoHandlerAdapter; 034import org.apache.mina.core.session.IoSession; 035import org.junit.Test; 036 037/** 038 * TODO Add documentation 039 * 040 * @author <a href="http://mina.apache.org">Apache MINA Project</a> 041 */ 042public class VmPipeSessionCrossCommunicationTest { 043 @Test 044 public void testOneSessionTalkingBackAndForthDoesNotDeadlock() throws Exception { 045 final VmPipeAddress address = new VmPipeAddress(1); 046 final IoConnector connector = new VmPipeConnector(); 047 final AtomicReference<IoSession> c1 = new AtomicReference<IoSession>(); 048 final CountDownLatch latch = new CountDownLatch(1); 049 final CountDownLatch messageCount = new CountDownLatch(2); 050 IoAcceptor acceptor = new VmPipeAcceptor(); 051 052 acceptor.setHandler(new IoHandlerAdapter() { 053 @Override 054 public void messageReceived(IoSession session, Object message) throws Exception { 055 //System.out.println(Thread.currentThread().getName() + ": " + message); 056 057 if ("start".equals(message)) { 058 session.write("open new"); 059 } else if ("re-use c1".equals(message)) { 060 session.write("tell me something on c1 now"); 061 } else if (((String) message).startsWith("please don't deadlock")) { 062 messageCount.countDown(); 063 } else { 064 fail("unexpected message received " + message); 065 } 066 } 067 }); 068 acceptor.bind(address); 069 070 connector.setHandler(new IoHandlerAdapter() { 071 @Override 072 public void messageReceived(IoSession session, Object message) throws Exception { 073 //System.out.println(Thread.currentThread().getName() + ": " + message); 074 075 if ("open new".equals(message)) { 076 //System.out.println("opening c2 from " + Thread.currentThread().getName()); 077 078 IoConnector c2 = new VmPipeConnector(); 079 c2.setHandler(new IoHandlerAdapter() { 080 @Override 081 public void sessionOpened(IoSession session) throws Exception { 082 session.write("re-use c1"); 083 } 084 085 @Override 086 public void messageReceived(IoSession session, Object message) throws Exception { 087 //System.out.println(Thread.currentThread().getName() + ": " + message); 088 089 if ("tell me something on c1 now".equals(message)) { 090 latch.countDown(); 091 c1.get().write("please don't deadlock via c1"); 092 } else { 093 fail("unexpected message received " + message); 094 } 095 } 096 }); 097 098 ConnectFuture c2Future = c2.connect(address); 099 100 c2Future.await(); 101 102 latch.await(); 103 104 c2Future.getSession().write("please don't deadlock via c2"); 105 } else { 106 fail("unexpeced message received " + message); 107 } 108 } 109 }); 110 111 ConnectFuture future = connector.connect(address); 112 113 future.await(); 114 115 c1.set(future.getSession()); 116 c1.get().write("start"); 117 118 ThreadMXBean threadMXBean = ManagementFactory.getThreadMXBean(); 119 120 while (!messageCount.await(100, TimeUnit.MILLISECONDS)) { 121 long[] threads = threadMXBean.findMonitorDeadlockedThreads(); 122 123 if (null != threads) { 124 StringBuffer sb = new StringBuffer(256); 125 ThreadInfo[] infos = threadMXBean.getThreadInfo(threads, Integer.MAX_VALUE); 126 127 for (ThreadInfo info : infos) { 128 sb.append(info.getThreadName()).append(" blocked on ").append(info.getLockName()) 129 .append(" owned by ").append(info.getLockOwnerName()).append("\n"); 130 } 131 132 for (ThreadInfo info : infos) { 133 sb.append("\nStack for ").append(info.getThreadName()).append("\n"); 134 for (StackTraceElement element : info.getStackTrace()) { 135 sb.append("\t").append(element).append("\n"); 136 } 137 } 138 139 fail("deadlocked! \n" + sb); 140 } 141 } 142 143 acceptor.setCloseOnDeactivation(false); 144 acceptor.dispose(); 145 } 146}