unic.mentoring.jms.ctrl.MessageCtrl.java Source code

Introduction

Here is the source code for unic.mentoring.jms.ctrl.MessageCtrl.java

Source

/**
 * @author Unic
 * "hw12" project, Jan 17, 2015, 8:17:36 PM
 * GPL v3: http://gnu.org/licenses
 */

package unic.mentoring.jms.ctrl;

import javax.jms.Connection;
import javax.jms.ConnectionFactory;
import javax.jms.JMSException;
import javax.jms.MessageProducer;
import javax.jms.Session;
import javax.jms.TextMessage;
import javax.jms.Topic;

import org.apache.activemq.ActiveMQConnectionFactory;
import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.util.StringUtils;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.bind.annotation.RequestParam;

import unic.mentoring.jms.Constants;

@Controller
public class MessageCtrl {
    private static final String ATTR_MESSAGE = "message";

    @RequestMapping(value = "/message", method = RequestMethod.POST)
    public String message(Model model, @RequestParam("message") String message,
            @RequestParam("topic") String topic) {
        if (!StringUtils.isEmpty(message)) {
            try {
                sendMessage(message, topic);
                model.addAttribute(ATTR_MESSAGE,
                        "Message (length: " + message.length() + ") has been sent into topic \"" + topic + "\".");
            } catch (JMSException e) {
                model.addAttribute(ATTR_MESSAGE, "Can't send message: " + e.getMessage());
            }
        } else {
            model.addAttribute(ATTR_MESSAGE, "No message has been specified to send.");
        }

        return Constants.Page.INDEX;
    }

    protected void sendMessage(String message, String topicName) throws JMSException {
        ConnectionFactory connectionFactory = new ActiveMQConnectionFactory();
        Connection connection = connectionFactory.createConnection();
        connection.start();

        Session session = connection.createSession(false, Session.AUTO_ACKNOWLEDGE);
        Topic topic = session.createTopic(topicName);
        MessageProducer producer = session.createProducer(topic);
        TextMessage jmsMessage = session.createTextMessage();
        jmsMessage.setText(message);

        producer.send(jmsMessage);
        connection.close();
    }
}