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.artemis.tests.integration.openwire.amq;
  
  import javax.jms.Connection;
  import javax.jms.MessageConsumer;
  import javax.jms.MessageProducer;
  import javax.jms.Session;
  import javax.jms.TextMessage;
  import java.lang.invoke.MethodHandles;
  import java.util.concurrent.CountDownLatch;
  import java.util.concurrent.CyclicBarrier;
  import java.util.concurrent.ExecutorService;
  import java.util.concurrent.Executors;
  import java.util.concurrent.TimeUnit;
  import java.util.concurrent.atomic.AtomicInteger;
  
  import org.apache.activemq.artemis.tests.integration.openwire.BasicOpenWireTest;
  import org.apache.activemq.command.ActiveMQDestination;
  import org.apache.activemq.command.ActiveMQTopic;
  import org.junit.jupiter.api.Test;
  import org.slf4j.Logger;
  import org.slf4j.LoggerFactory;
  
  import static org.junit.jupiter.api.Assertions.assertEquals;
  import static org.junit.jupiter.api.Assertions.assertNotNull;
  import static org.junit.jupiter.api.Assertions.assertNull;
  import static org.junit.jupiter.api.Assertions.assertTrue;
  
  /**
   * This test is to make sure a consumer on a transaction session, would receive all messages even
   * when the number of messages is bigger than prefetch.
   * <p>
   * Basically I am making sure flow control will still issue credits even thought the messages are not removed with a (ACK mode = remove)
   */
  public class SimpleConsumerLargeCountTest extends BasicOpenWireTest {
  
     private static final Logger logger = LoggerFactory.getLogger(MethodHandles.lookup().lookupClass());
  
     @Test
     public void testTopicReceiverFlowControlled() throws Exception {
        Session session = connection.createSession(true, Session.SESSION_TRANSACTED);
        ActiveMQTopic destination = (ActiveMQTopic) this.createDestination(session, ActiveMQDestination.TOPIC_TYPE);
        connection.start();
  
        // trying to starve the server if there's anything blocking on a create resources
        int numberOfSubscriptions = 50;
        // more messages than prefetch
        int numberOfMessages = 500;
        int rollbackAt = 50;
  
        ExecutorService service = Executors.newFixedThreadPool(numberOfSubscriptions);
        runAfter(service::shutdownNow);
        AtomicInteger errors = new AtomicInteger(0);
  
        CountDownLatch done = new CountDownLatch(numberOfSubscriptions);
  
        CyclicBarrier startFlag = new CyclicBarrier(numberOfSubscriptions + 1);
        for (int dest = 0; dest < numberOfSubscriptions; dest++) {
           final int finalDest = dest;
           service.execute(() -> {
              Connection connConsumer = null;
              try {
                 connConsumer = factory.createConnection();
                 connConsumer.setClientID("client" + finalDest);
                 Session sessConsumer = connConsumer.createSession(true, Session.SESSION_TRANSACTED);
                 MessageConsumer consumer = sessConsumer.createDurableSubscriber(destination, "cons" + finalDest);
                 connConsumer.start();
                 startFlag.await(10, TimeUnit.SECONDS);
  
                 for (int rollbackNumber = 0; rollbackNumber < 2; rollbackNumber++) {
                    for (int i = 0; i < rollbackAt; i++) {
                       TextMessage message = (TextMessage) consumer.receive(5000);
                       logger.debug("Received {}, dest={}", i, finalDest);
                       assertNotNull(message);
                       assertEquals(i, message.getIntProperty("i"));
                    }
                    // this is just to make the test more challenging. rollback destinations, make sure they won't block
                    // and flow control would stlil be okay on sending more messages
                    sessConsumer.rollback();
                 }
  
                 consumer.close();
                 consumer = sessConsumer.createDurableSubscriber(destination, "cons" + finalDest);
  
  
                 for (int i = 0; i < numberOfMessages; i++) {
                    TextMessage message = (TextMessage) consumer.receive(5000);
                    logger.debug("Received {}, dest={}", i, finalDest);
                    assertNotNull(message);
                    assertEquals(i, message.getIntProperty("i"));
                 }
                 sessConsumer.commit();
                 assertNull(consumer.receiveNoWait());
  
              } catch (Throwable e) {
                 logger.warn(e.getMessage(), e);
                 errors.incrementAndGet();
              } finally {
                 if (connConsumer != null) {
                    try {
                       connConsumer.close();
                    } catch (Throwable ignored) {
                    }
                 }
                 done.countDown();
              }
           });
        }
  
        startFlag.await(10, TimeUnit.SECONDS);
  
        MessageProducer producer = session.createProducer(destination);
        for (int i = 0; i < numberOfMessages; i++) {
           TextMessage message = session.createTextMessage("Message: " + i);
           message.setIntProperty("i", i);
           producer.send(message);
        }
        session.commit();
  
        assertTrue(done.await(1, TimeUnit.MINUTES));
        assertEquals(0, errors.get());
        service.shutdownNow();
        assertTrue(service.awaitTermination(10, TimeUnit.SECONDS));
     }
  }