Listener.java

/***************************************************************************************
KingCobra - A Research Software for Distributed Request Service on Cloud with Arbiters

This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.

This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU General Public License for more details.

You should have received a copy of the GNU General Public License
along with this program.  If not, see <http://www.gnu.org/licenses/>.

--------------------------------------------------------------------------------------------------
Copyright (C):
Srinivasan Kannan (alias) Ka.Shrinivaasan (alias) Shrinivas Kannan
Independent Open Source Developer, Researcher and Consultant
Ph: 9789346927, 9003082186, 9791165980
Open Source Products Profile(Krishna iResearch): http://sourceforge.net/users/ka_shrinivaasan, https://www.ohloh.net/accounts/ka_shrinivaasan
Personal website(research): https://sites.google.com/site/kuja27/
emails: ka.shrinivaasan@gmail.com, shrinivas.kannan@gmail.com, kashrinivaasan@live.com
--------------------------------------------------------------------------------------------------
*****************************************************************************************/




package kingcobra;

import org.apache.qpid.amqp_1_0.jms.impl.*;
import javax.jms.*;

class Listener {

    public static void main(String []args) throws JMSException {

        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 destination = arg(args, 0, "queue://kingcobraq");

        ConnectionFactoryImpl factory = new ConnectionFactoryImpl(host, port, user, password);
        Destination dest = null;
        if( destination.startsWith("topic://") ) {
            dest = new TopicImpl(destination);
        } else {
            dest = new QueueImpl(destination);
        }

        Connection connection = factory.createConnection(user, password);
        connection.start();
        Session session = connection.createSession(false, Session.AUTO_ACKNOWLEDGE);
        MessageConsumer consumer = session.createConsumer(dest);
        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();
                    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;
    }
}