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 example;
  
  import org.apache.qpid.jms.*;
  import jakarta.jms.*;
  
  class Listener {
  
      public static void main(String[] args) throws JMSException {
  
          final String TOPIC_PREFIX = "topic://";
  
          String user = env("ACTIVEMQ_USER", "admin");
          String password = env("ACTIVEMQ_PASSWORD", "password");
          String host = env("ACTIVEMQ_HOST", "localhost");
          int port = Integer.parseInt(env("ACTIVEMQ_PORT", "5672"));
  
          String connectionURI = "amqp://" + host + ":" + port;
          String destinationName = arg(args, 0, "topic://event");
  
          JmsConnectionFactory factory = new JmsConnectionFactory(connectionURI);
  
          Connection connection = factory.createConnection(user, password);
          connection.start();
          Session session = connection.createSession(false, Session.AUTO_ACKNOWLEDGE);
  
          Destination destination = null;
          if (destinationName.startsWith(TOPIC_PREFIX)) {
              destination = session.createTopic(destinationName.substring(TOPIC_PREFIX.length()));
          } else {
              destination = session.createQueue(destinationName);
          }
  
          MessageConsumer consumer = session.createConsumer(destination);
          long start = System.currentTimeMillis();
          long count = 1;
          System.out.println("Waiting for messages...");
          while (true) {
              Message msg = consumer.receive();
              if (msg instanceof TextMessage) {
                  String body = ((TextMessage) msg).getText();
                  if ("SHUTDOWN".equals(body)) {
                      long diff = System.currentTimeMillis() - start;
                      System.out.println(String.format("Received %d in %.2f seconds", count, (1.0 * diff / 1000.0)));
                      connection.close();
                      try {
                          Thread.sleep(10);
                      } catch (Exception e) {}
                      System.exit(1);
                  } else {
                      try {
                          if (count != msg.getIntProperty("id")) {
                              System.out.println("mismatch: " + count + "!=" + msg.getIntProperty("id"));
                          }
                      } catch (NumberFormatException ignore) {
                      }
  
                      if (count == 1) {
                          start = System.currentTimeMillis();
                      } else if (count % 1000 == 0) {
                          System.out.println(String.format("Received %d messages.", count));
                      }
                      count++;
                  }
  
              } else {
                  System.out.println("Unexpected message type: " + msg.getClass());
              }
          }
      }
  
      private static String env(String key, String defaultValue) {
          String rc = System.getenv(key);
          if (rc == null)
              return defaultValue;
          return rc;
      }
  
      private static String arg(String[] args, int index, String defaultValue) {
          if (index < args.length)
              return args[index];
          else
              return defaultValue;
      }
  }
  