content: /*
   * 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.failover;
  
  import javax.jms.MessageConsumer;
  import javax.jms.Queue;
  import javax.jms.Session;
  import java.util.ArrayList;
  import java.util.HashMap;
  import java.util.HashSet;
  import java.util.List;
  import java.util.Map;
  import java.util.Set;
  import java.util.concurrent.TimeUnit;
  
  import org.apache.activemq.ActiveMQConnection;
  import org.apache.activemq.ActiveMQConnectionFactory;
  import org.apache.activemq.artemis.core.config.Configuration;
  import org.apache.activemq.artemis.jms.server.config.impl.JMSConfigurationImpl;
  import org.apache.activemq.artemis.jms.server.embedded.EmbeddedJMS;
  import org.apache.activemq.broker.artemiswrapper.OpenwireArtemisBaseTest;
  import org.junit.After;
  import org.junit.Assert;
  import org.junit.Before;
  import org.junit.Test;
  
  public class TwoBrokerFailoverClusterTest extends OpenwireArtemisBaseTest {
  
     private static final int NUMBER_OF_CLIENTS = 30;
     private final List<ActiveMQConnection> connections = new ArrayList<>();
     private EmbeddedJMS server0;
     private EmbeddedJMS server1;
     private String clientUrl;
  
     @Test
     public void testTwoBrokersRestart() throws Exception {
  
        Thread.sleep(2000);
        createClients();
  
        Thread.sleep(5000);
  
        assertClientsConnectedToTwoBrokers();
        assertClientsConnectionsEvenlyDistributed(.26);
  
        server0.stop();
        Assert.assertTrue(server1.waitClusterForming(100, TimeUnit.MILLISECONDS, 20, 1));
  
        Thread.sleep(1000);
  
        assertAllConnectedTo(newURI("127.0.0.1", 1));
  
        Thread.sleep(5000);
  
        server0.start();
        Assert.assertTrue(server0.waitClusterForming(100, TimeUnit.MILLISECONDS, 20, 2));
        Assert.assertTrue(server1.waitClusterForming(100, TimeUnit.MILLISECONDS, 20, 2));
        Thread.sleep(5000);
  
        //need update-cluster-clients, -on-remove and rebalance set to true.
        assertClientsConnectedToTwoBrokers();
        assertClientsConnectionsEvenlyDistributed(.26);
     }
  
     @Before
     public void setUp() throws Exception {
        Map<String, String> map = new HashMap<>();
        map.put("rebalanceClusterClients", "true");
        map.put("updateClusterClients", "true");
        map.put("updateClusterClientsOnRemove", "true");
        Configuration config0 = createConfig("127.0.0.1", 0, map);
        Configuration config1 = createConfig("127.0.0.1", 1, map);
  
        deployClusterConfiguration(config0, 1);
        deployClusterConfiguration(config1, 0);
  
        server0 = new EmbeddedJMS().setConfiguration(config0).setJmsConfiguration(new JMSConfigurationImpl());
        server1 = new EmbeddedJMS().setConfiguration(config1).setJmsConfiguration(new JMSConfigurationImpl());
  
        clientUrl = "failover://(" + newURI("127.0.0.1", 0) + "," + newURI("127.0.0.1", 1) + ")";
  
        server0.start();
        server1.start();
        Assert.assertTrue(server0.waitClusterForming(100, TimeUnit.MILLISECONDS, 20, 2));
        Assert.assertTrue(server1.waitClusterForming(100, TimeUnit.MILLISECONDS, 20, 2));
     }
  
     @After
     public void tearDown() throws Exception {
        for (ActiveMQConnection conn : connections) {
           conn.close();
        }
        server0.stop();
        server1.stop();
     }
  
     protected void createClients() throws Exception {
        createClients(NUMBER_OF_CLIENTS);
     }
  
     protected void createClients(int numOfClients) throws Exception {
        ActiveMQConnectionFactory factory = new ActiveMQConnectionFactory(clientUrl);
        for (int i = 0; i < numOfClients; i++) {
           ActiveMQConnection c = (ActiveMQConnection) factory.createConnection();
           c.start();
           Session s = c.createSession(false, Session.AUTO_ACKNOWLEDGE);
           Queue queue = s.createQueue(getClass().getName());
           MessageConsumer consumer = s.createConsumer(queue);
           connections.add(c);
        }
     }
  
     protected void assertClientsConnectedToTwoBrokers() {
        Set<String> set = new HashSet<>();
        for (ActiveMQConnection c : connections) {
           if (c.getTransportChannel().getRemoteAddress() != null) {
              set.add(c.getTransportChannel().getRemoteAddress());
           }
        }
        Assert.assertTrue("Only 2 connections should be found: " + set, set.size() == 2);
     }
  
     protected void assertClientsConnectionsEvenlyDistributed(double minimumPercentage) {
        Map<String, Double> clientConnectionCounts = new HashMap<>();
        int total = 0;
        for (ActiveMQConnection c : connections) {
           String key = c.getTransportChannel().getRemoteAddress();
           if (key != null) {
              total++;
              if (clientConnectionCounts.containsKey(key)) {
                 double count = clientConnectionCounts.get(key);
                 count += 1.0;
                 clientConnectionCounts.put(key, count);
              } else {
                 clientConnectionCounts.put(key, 1.0);
              }
           }
        }
        Set<String> keys = clientConnectionCounts.keySet();
        for (String key : keys) {
           double count = clientConnectionCounts.get(key);
           double percentage = count / total;
           System.out.println(count + " of " + total + " connections for " + key + " = " + percentage);
           Assert.assertTrue("Connections distribution expected to be >= than " + minimumPercentage + ".  Actual distribution was " + percentage + " for connection " + key, percentage >= minimumPercentage);
        }
     }
  
     protected void assertAllConnectedTo(String url) throws Exception {
        for (ActiveMQConnection c : connections) {
           Assert.assertEquals(url, c.getTransportChannel().getRemoteAddress());
        }
     }
  
  }
  