/*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance
* with the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing,
* software distributed under the License is distributed on an
* "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
* KIND, either express or implied. See the License for the
* specific language governing permissions and limitations
* under the License.
*/
package org.apache.mina.transport.vmpipe;
import java.lang.management.ManagementFactory;
import java.lang.management.ThreadInfo;
import java.lang.management.ThreadMXBean;
import java.util.concurrent.CountDownLatch;
import java.util.concurrent.TimeUnit;
import java.util.concurrent.atomic.AtomicReference;
import junit.framework.TestCase;
import org.apache.mina.common.ConnectFuture;
import org.apache.mina.common.IoAcceptor;
import org.apache.mina.common.IoConnector;
import org.apache.mina.common.IoHandlerAdapter;
import org.apache.mina.common.IoSession;
/**
* @author Apache Mina Project (dev@mina.apache.org)
* @version $Rev: $, $Date: $
*/
public class VmPipeSessionCrossCommunicationTest extends TestCase {
public void testOneSessionTalkingBackAndForthDoesNotDeadlock() throws Exception {
final VmPipeAddress address = new VmPipeAddress(1);
final IoConnector connector = new VmPipeConnector();
final AtomicReference<IoSession> c1 = new AtomicReference<IoSession>();
final CountDownLatch latch = new CountDownLatch(1);
final CountDownLatch messageCount = new CountDownLatch(2);
IoAcceptor acceptor = new VmPipeAcceptor();
acceptor.setHandler(new IoHandlerAdapter() {
@Override
public void messageReceived(IoSession session, Object message) throws Exception {
System.out.println(Thread.currentThread().getName() + ": " + message);
if ("start".equals(message)) {
session.write("open new");
} else if ("re-use c1".equals(message)) {
session.write("tell me something on c1 now");
} else if (((String) message).startsWith("please don't deadlock")) {
messageCount.countDown();
} else {
fail("unexpected message received " + message);
}
}
});
acceptor.bind(address);
connector.setHandler(new IoHandlerAdapter() {
@Override
public void messageReceived(IoSession session, Object message) throws Exception {
System.out.println(Thread.currentThread().getName() + ": " + message);
if ("open new".equals(message)) {
System.out.println("opening c2 from " + Thread.currentThread().getName());
IoConnector c2 = new VmPipeConnector();
c2.setHandler(new IoHandlerAdapter() {
@Override
public void sessionOpened(IoSession session) throws Exception {
session.write("re-use c1");
}
@Override
public void messageReceived(IoSession session, Object message) throws Exception {
System.out.println(Thread.currentThread().getName() + ": " + message);
if ("tell me something on c1 now".equals(message)) {
latch.countDown();
c1.get().write("please don't deadlock via c1");
} else {
fail("unexpected message received " + message);
}
}
});
ConnectFuture c2Future = c2.connect(address);
c2Future.await();
latch.await();
c2Future.getSession().write("please don't deadlock via c2");
} else {
fail("unexpeced message received " + message);
}
}
});
ConnectFuture future = connector.connect(address);
future.await();
c1.set(future.getSession());
c1.get().write("start");
ThreadMXBean threadMXBean = ManagementFactory.getThreadMXBean();
while (!messageCount.await(100, TimeUnit.MILLISECONDS)) {
long[] threads = threadMXBean.findMonitorDeadlockedThreads();
if (null != threads) {
StringBuffer sb = new StringBuffer(256);
ThreadInfo[] infos = threadMXBean.getThreadInfo(threads, Integer.MAX_VALUE);
for (ThreadInfo info : infos) {
sb.append(info.getThreadName())
.append(" blocked on ")
.append(info.getLockName())
.append(" owned by ")
.append(info.getLockOwnerName())
.append("\n");
}
for (ThreadInfo info : infos) {
sb.append("\nStack for ").append(info.getThreadName()).append("\n");
for (StackTraceElement element : info.getStackTrace()) {
sb.append("\t").append(element).append("\n");
}
}
fail("deadlocked! \n" + sb);
}
}
acceptor.setCloseOnDeactivation(false);
acceptor.dispose();
}
}