package com.codenotfound.jms.pubsub;

import javax.jms.Connection;
import javax.jms.ConnectionFactory;
import javax.jms.JMSException;
import javax.jms.Message;
import javax.jms.MessageConsumer;
import javax.jms.Session;
import javax.jms.TextMessage;
import javax.jms.Topic;

import org.apache.activemq.ActiveMQConnection;
import org.apache.activemq.ActiveMQConnectionFactory;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

public class Subscriber {

  private static final Logger LOGGER =

  private static final String NO_GREETING = "no greeting";

  private String clientId;
  private Connection connection;
  private MessageConsumer messageConsumer;

  public void create(String clientId, String topicName)
      throws JMSException {
    this.clientId = clientId;

    // create a Connection Factory
    ConnectionFactory connectionFactory =
        new ActiveMQConnectionFactory(

    // create a Connection
    connection = connectionFactory.createConnection();

    // create a Session
    Session session =
        connection.createSession(false, Session.AUTO_ACKNOWLEDGE);

    // create the Topic from which messages will be received
    Topic topic = session.createTopic(topicName);

    // create a MessageConsumer for receiving messages
    messageConsumer = session.createConsumer(topic);

    // start the connection in order to receive messages

  public void closeConnection() throws JMSException {

  public String getGreeting(int timeout) throws JMSException {

    String greeting = NO_GREETING;

    // read a message from the topic destination
    Message message = messageConsumer.receive(timeout);

    // check if a message was received
    if (message != null) {
      // cast the message to the correct type
      TextMessage textMessage = (TextMessage) message;

      // retrieve the message content
      String text = textMessage.getText();
      LOGGER.debug(clientId + ": received message with text='{}'",

      // create greeting
      greeting = "Hello " + text + "!";
    } else {
      LOGGER.debug(clientId + ": no message received");
    }"greeting={}", greeting);
    return greeting;