/**
* 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.activemq.bugs;
import org.apache.activemq.ActiveMQConnection;
import org.apache.activemq.ActiveMQConnectionFactory;
import org.apache.activemq.broker.BrokerService;
import org.apache.activemq.broker.TransportConnector;
import org.apache.activemq.util.Wait;
import org.junit.After;
import org.junit.Before;
import org.junit.Test;
import org.springframework.jms.support.JmsUtils;
import javax.jms.Connection;
import javax.jms.ConnectionFactory;
import java.util.LinkedList;
import java.util.concurrent.ConcurrentLinkedQueue;
import java.util.concurrent.CountDownLatch;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;
import static org.junit.Assert.assertEquals;
import static org.junit.Assert.assertTrue;
public class AMQ5486Test {
private static final int maxConnections = 100;
private static final int maxPoolSize = 10;
private final ExecutorService executor = Executors.newCachedThreadPool();
private String connectionUri;
private BrokerService service;
private TransportConnector connector;
final ConcurrentLinkedQueue<Connection> connections = new ConcurrentLinkedQueue<Connection>();
@Before
public void setUp() throws Exception {
// max out the pool and reject work
System.setProperty("org.apache.activemq.transport.nio.SelectorManager.maximumPoolSize", String.valueOf(maxPoolSize));
System.setProperty("org.apache.activemq.transport.nio.SelectorManager.workQueueCapacity", "0");
System.setProperty("org.apache.activemq.transport.nio.SelectorManager.rejectWork", "true");
service = new BrokerService();
service.setPersistent(false);
service.setUseJmx(false);
connector = service.addConnector("nio://0.0.0.0:0");
connectionUri = connector.getPublishableConnectString();
service.start();
service.waitUntilStarted();
}
protected ConnectionFactory createConnectionFactory() throws Exception {
return new ActiveMQConnectionFactory(connectionUri);
}
@Test
public void testFailureOnSelectorThreadPoolExhaustion() throws Exception {
final ConnectionFactory cf = createConnectionFactory();
final CountDownLatch startupLatch = new CountDownLatch(1);
final LinkedList<Exception> exceptions = new LinkedList<Exception>();
for(int i = 0; i < maxConnections; i++) {
executor.submit(new Runnable() {
@Override
public void run() {
ActiveMQConnection conn = null;
try {
startupLatch.await();
conn = (ActiveMQConnection) cf.createConnection();
conn.start();
//conn.syncSendPacket(new TransactionInfo(conn.getConnectionInfo().getConnectionId(), null, TransactionInfo.END));
connections.add(conn);
} catch (Exception e) {
exceptions.add(e);
JmsUtils.closeConnection(conn);
}
}
});
}
// No connections at first
assertEquals(0, connector.getConnections().size());
// Release the latch to set up connections in parallel
startupLatch.countDown();
final TransportConnector connector = this.connector;
// Expect the max connections is created
assertTrue("Expected some exceptions",
Wait.waitFor(new Wait.Condition() {
@Override
public boolean isSatisified() throws Exception {
return !exceptions.isEmpty();
}
})
);
assertTrue("Expected: more than " + (maxPoolSize - 1) + " connections, found: " + connector.getConnections().size(),
Wait.waitFor(new Wait.Condition() {
@Override
public boolean isSatisified() throws Exception {
// selector thread will take one thread from the pool
return connector.getConnections().size() >= maxPoolSize - 1;
}
})
);
}
@After
public void tearDown() throws Exception {
executor.shutdownNow();
for (Connection connection : connections) {
JmsUtils.closeConnection(connection);
}
service.stop();
service.waitUntilStopped();
}
}