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   * 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.
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  package org.apache.activemq.artemis.tests.integration.client;
  
  import static org.junit.jupiter.api.Assertions.assertEquals;
  import static org.junit.jupiter.api.Assertions.assertNotNull;
  
  import org.apache.activemq.artemis.api.core.QueueConfiguration;
  import org.apache.activemq.artemis.api.core.SimpleString;
  import org.apache.activemq.artemis.api.core.client.ClientConsumer;
  import org.apache.activemq.artemis.api.core.client.ClientMessage;
  import org.apache.activemq.artemis.api.core.client.ClientProducer;
  import org.apache.activemq.artemis.api.core.client.ClientSession;
  import org.apache.activemq.artemis.api.core.client.ClientSessionFactory;
  import org.apache.activemq.artemis.api.core.client.ServerLocator;
  import org.apache.activemq.artemis.core.server.ActiveMQServer;
  import org.apache.activemq.artemis.tests.util.ActiveMQTestBase;
  import org.junit.jupiter.api.Test;
  import org.slf4j.Logger;
  import org.slf4j.LoggerFactory;
  import java.lang.invoke.MethodHandles;
  
  public class ConsumerRoundRobinTest extends ActiveMQTestBase {
  
     private static final Logger logger = LoggerFactory.getLogger(MethodHandles.lookup().lookupClass());
  
     public final SimpleString addressA = SimpleString.of("addressA");
  
     public final SimpleString queueA = SimpleString.of("queueA");
  
     @Test
     public void testConsumersRoundRobinCorrectly() throws Exception {
        ActiveMQServer server = createServer(false);
        server.start();
        ServerLocator locator = createInVMNonHALocator();
        ClientSessionFactory cf = createSessionFactory(locator);
        ClientSession session = addClientSession(cf.createSession(false, true, true));
        session.createQueue(QueueConfiguration.of(queueA).setAddress(addressA).setDurable(false));
  
        ClientConsumer[] consumers = new ClientConsumer[5];
        // start the session before we create the consumers, this is because start is non blocking and we have to
        // guarantee
        // all consumers have been started before sending messages
        session.start();
        consumers[0] = session.createConsumer(queueA);
        consumers[1] = session.createConsumer(queueA);
        consumers[2] = session.createConsumer(queueA);
        consumers[3] = session.createConsumer(queueA);
        consumers[4] = session.createConsumer(queueA);
  
        ClientProducer cp = session.createProducer(addressA);
        int numMessage = 10;
        for (int i = 0; i < numMessage; i++) {
           ClientMessage cm = session.createMessage(false);
           cm.getBodyBuffer().writeInt(i);
           cp.send(cm);
        }
        int currMessage = 0;
        for (int i = 0; i < numMessage / 5; i++) {
           logger.debug("i is {}", i);
           for (int j = 0; j < 5; j++) {
              logger.debug("j is {}", j);
              ClientMessage cm = consumers[j].receive(5000);
              assertNotNull(cm);
              assertEquals(currMessage++, cm.getBodyBuffer().readInt());
              cm.acknowledge();
           }
        }
     }
  
  }
  