alvinalexander.com | career | drupal | java | mac | mysql | perl | scala | uml | unix  

ActiveMQ example source code file (DiscoveryTransportNoBrokerTest.java)

This example ActiveMQ source code file (DiscoveryTransportNoBrokerTest.java) is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Java - ActiveMQ tags/keywords

activemqconnectionfactory, activemqconnectionfactory, connecting, connection, discoveryevent, exception, jmsexception, net, network, string, string, stubcompositetransport, thread, thread, uri, uri, util

The ActiveMQ DiscoveryTransportNoBrokerTest.java source code

/**
 * 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.transport.discovery;

import java.net.URI;
import java.util.Map;
import java.util.Vector;

import javax.jms.Connection;
import javax.jms.JMSException;

import org.apache.activemq.ActiveMQConnectionFactory;
import org.apache.activemq.CombinationTestSupport;
import org.apache.activemq.broker.BrokerService;
import org.apache.activemq.broker.TransportConnector;
import org.apache.activemq.command.DiscoveryEvent;
import org.apache.activemq.transport.StubCompositeTransport;
import org.apache.activemq.util.URISupport;
import org.apache.activemq.util.URISupport.CompositeData;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

public class DiscoveryTransportNoBrokerTest extends CombinationTestSupport {

    private static final Logger LOG = LoggerFactory.getLogger(DiscoveryTransportNoBrokerTest.class);

    public void testNoExtraThreads() throws Exception {
        BrokerService broker = new BrokerService();
        TransportConnector tcp = broker.addConnector("tcp://localhost:0?transport.closeAsync=false");
        String group = "GR-" +  System.currentTimeMillis();
        URI discoveryUri = new URI("multicast://default?group=" + group);
        tcp.setDiscoveryUri(discoveryUri);
        broker.start();
        broker.waitUntilStarted();
        
        Vector<String> existingNames = new Vector();
        Thread[] threads = getThreads();
        for (Thread t : threads) {
            existingNames.add(t.getName());
        }
        final int idleThreadCount = threads.length;
        LOG.info("Broker started - thread Count:" + idleThreadCount);
        
       final int noConnectionToCreate = 10;
        for (int i=0; i<10;i++) {
            ActiveMQConnectionFactory factory = 
                new ActiveMQConnectionFactory("discovery:(multicast://239.255.2.3:6155?group=" + group +")?closeAsync=false");
            LOG.info("Connecting.");
            Connection connection = factory.createConnection();
            connection.setClientID("test");  
            connection.close();
        }
        Thread.sleep(2000);
        threads = getThreads();
        for (Thread t : threads) {
            if (!existingNames.contains(t.getName())) {
                LOG.info("Remaining thread:" + t);
            }
        }
        assertTrue("no extra threads per connection", Thread.activeCount() - idleThreadCount < noConnectionToCreate);
    }
   
    
    private Thread[] getThreads() {
        Thread[] threads = new Thread[Thread.activeCount()];
        Thread.enumerate(threads);
        return threads;
    }


    public void testMaxReconnectAttempts() throws JMSException {
        try {
            ActiveMQConnectionFactory factory = new ActiveMQConnectionFactory("discovery:(multicast://doesNOTexist)");
            LOG.info("Connecting.");
            Connection connection = factory.createConnection();
            connection.setClientID("test");
            fail("Did not fail to connect as expected.");
        }
        catch ( JMSException expected ) {
            assertTrue("reason is java.io.IOException, was: " + expected.getCause(), expected.getCause() instanceof java.io.IOException);
        }
    }
    
    public void testInitialConnectDelayWithNoBroker() throws Exception {
        // the initialReconnectDelay only kicks in once a set of connect URL have
        // been returned from the discovery agent.
        // Up to that point the reconnectDelay is used which has a default value of 10
        //
        long initialReconnectDelay = 4000;
        long startT = System.currentTimeMillis();
        String groupId = "WillNotMatch" + startT;
        try {
            String urlStr = "discovery:(multicast://default?group=" + groupId + 
                ")?useExponentialBackOff=false&maxReconnectAttempts=2&reconnectDelay=" + initialReconnectDelay;
            ActiveMQConnectionFactory factory = new ActiveMQConnectionFactory(urlStr);
            LOG.info("Connecting.");
            Connection connection = factory.createConnection();
            connection.setClientID("test");
            fail("Did not fail to connect as expected.");
        } catch ( JMSException expected ) {
            assertTrue("reason is java.io.IOException, was: " + expected.getCause(), expected.getCause() instanceof java.io.IOException);
            long duration = System.currentTimeMillis() - startT;
            assertTrue("took at least initialReconnectDelay time: " + duration + " e:" + expected, duration >= initialReconnectDelay);
        }
    }
    
    public void testSetDiscoveredBrokerProperties() throws Exception {
        final String extraParameterName = "connectionTimeout";
        final String extraParameterValue = "3000";
        final URI uri = new URI("discovery:(multicast://default)?initialReconnectDelay=100&"
                + DiscoveryListener.DISCOVERED_OPTION_PREFIX + extraParameterName + "=" + extraParameterValue);
        CompositeData compositeData = URISupport.parseComposite(uri);
        
        StubCompositeTransport compositeTransport = new StubCompositeTransport();      
        DiscoveryTransport discoveryTransport = DiscoveryTransportFactory.createTransport(compositeTransport, compositeData, compositeData.getParameters());
        
        discoveryTransport.onServiceAdd(new DiscoveryEvent("tcp://localhost:61616"));        
        assertEquals("expected added URI after discovery event", compositeTransport.getTransportURIs().length, 1);
        
        URI discoveredServiceURI = compositeTransport.getTransportURIs()[0];
        Map<String, String> parameters = URISupport.parseParameters(discoveredServiceURI);
        assertTrue("unable to add parameter to discovered service", parameters.containsKey(extraParameterName));
        assertEquals("incorrect value for parameter added to discovered service", parameters.get(extraParameterName), extraParameterValue);
    }
    
    public void testAddRemoveDiscoveredBroker() throws Exception {
        final URI uri = new URI("discovery:(multicast://default)?initialReconnectDelay=100&connectionTimeout=3000");        
        CompositeData compositeData = URISupport.parseComposite(uri);
        
        StubCompositeTransport compositeTransport = new StubCompositeTransport();      
        DiscoveryTransport discoveryTransport = DiscoveryTransportFactory.createTransport(compositeTransport, compositeData, compositeData.getParameters());
        
        final String serviceName = "tcp://localhost:61616";
        discoveryTransport.onServiceAdd(new DiscoveryEvent(serviceName));        
        assertEquals("expected added URI after discovery event", 1, compositeTransport.getTransportURIs().length);
        
        discoveryTransport.onServiceRemove(new DiscoveryEvent(serviceName));        
        assertEquals("expected URI removed after discovery event", 0, compositeTransport.getTransportURIs().length);
    }
}

Other ActiveMQ examples (source code examples)

Here is a short list of links related to this ActiveMQ DiscoveryTransportNoBrokerTest.java source code file:

... this post is sponsored by my books ...

#1 New Release!

FP Best Seller

 

new blog posts

 

Copyright 1998-2021 Alvin Alexander, alvinalexander.com
All Rights Reserved.

A percentage of advertising revenue from
pages under the /java/jwarehouse URI on this website is
paid back to open source projects.