dk.au.cs.karibu.producer.rabbitmq.RabbitChannelConnector.java Source code

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Here is the source code for dk.au.cs.karibu.producer.rabbitmq.RabbitChannelConnector.java

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/*
 * Copyright 2013 Henrik Baerbak Christensen, Aarhus University
 *
 * Licensed 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 dk.au.cs.karibu.producer.rabbitmq;

import java.io.IOException;
import java.security.*;

import org.slf4j.LoggerFactory;
import org.slf4j.Logger;

import com.rabbitmq.client.*;

import dk.au.cs.karibu.producer.ChannelConnector;

/** A rabbit mq based implementation of the connection 
 * from the client to MQ channel. 
 *  
 * @author Henrik Baerbak Christensen, Aarhus University 
 */
public class RabbitChannelConnector implements ChannelConnector {

    private Channel channel;
    private Connection connection;
    private RabbitExchangeConfiguration exchangeConfiguration;
    private Logger theLogger;

    /** Declare a message producer 
     *  
     * @param exchangeConfiguration configuration of the exchange to send to 
     * @throws IOException 
     */
    public RabbitChannelConnector(RabbitExchangeConfiguration exchangeConfiguration) throws IOException {
        theLogger = LoggerFactory.getLogger(RabbitChannelConnector.class);
        theLogger.info("I am starting...");
        this.exchangeConfiguration = exchangeConfiguration;
        connection = null;
        channel = null;
    }

    public void send(byte[] payload, String topic) throws IOException {
        channel.basicPublish(exchangeConfiguration.getExchangeName(), topic, MessageProperties.PERSISTENT_BASIC,
                payload);
    }

    @Override
    public void openConnection() throws IOException {
        theLogger.info("openConnection: " + exchangeConfiguration);
        ConnectionFactory factory = new ConnectionFactory();
        factory.setUsername(exchangeConfiguration.getUsername());
        factory.setPassword(exchangeConfiguration.getPassword());
        if (exchangeConfiguration.isSSLConnection()) {
            try {
                factory.useSslProtocol();
            } catch (KeyManagementException e) {
                theLogger.error("KeyManagementException: " + e.getLocalizedMessage());
            } catch (NoSuchAlgorithmException e) {
                theLogger.error("NoSuchAlgorithmException: " + e.getLocalizedMessage());
            }
        }
        connection = factory.newConnection(exchangeConfiguration.getServerAddressList());

        channel = connection.createChannel();
        channel.exchangeDeclare(exchangeConfiguration.getExchangeName(), exchangeConfiguration.getExchangeType(),
                exchangeConfiguration.isExchangeDurable());

        // The queue and the binding between queue and exchange is defined by the server side! 
    }

    @Override
    public void closeConnection() throws IOException {
        // TODO - catch AlreadyClosedExceptions and just log them, otherwise ignore.
        channel.close();
        connection.close();
        channel = null;
        connection = null;
    }

    @Override
    public boolean isOpen() {
        return (connection != null);
    }
}