modules/monitoring/src/main/java/org/apache/airavata/monitoring/producer/RabbitMQEmailPublisher.java

/**
 *
 * 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 org.apache.airavata.monitoring.producer;

import com.rabbitmq.client.Channel;
import com.rabbitmq.client.Connection;
import com.rabbitmq.client.ConnectionFactory;
import org.apache.airavata.monitoring.MessageExtract;

import javax.mail.Message;
import javax.mail.MessagingException;
import java.io.IOException;
import java.net.URISyntaxException;
import java.security.KeyManagementException;
import java.security.NoSuchAlgorithmException;
import java.util.concurrent.TimeoutException;

public class RabbitMQEmailPublisher {
    private static final String EXCHANGE_TYPE = "fanout";
    private ConnectionFactory factory;
    private Connection connection;
    private Channel channel;
    private String exchangeName;

    /**
     * RabbitMQ Publisher with auto-recovery enabled
     *
     * @param exchangeName Name of the exchange
     * @param brokerURL    Broker URL
     * @param queueNames   Name of the queues which needs to be declared and binded to
     *                     the exchange
     * @throws IOException
     * @throws TimeoutException
     * @throws KeyManagementException
     * @throws NoSuchAlgorithmException
     * @throws URISyntaxException
     */
    public RabbitMQEmailPublisher(String exchangeName, String brokerURL,
                                  String[] queueNames) throws IOException, TimeoutException,
            KeyManagementException, NoSuchAlgorithmException,
            URISyntaxException {
        this.exchangeName = exchangeName;
        // TODO get singleton instance of connection factory
        this.factory = new ConnectionFactory();
        this.factory.setUri(brokerURL);
        factory.setAutomaticRecoveryEnabled(true);
        this.connection = factory.newConnection();
        this.channel = connection.createChannel();
        this.channel.exchangeDeclare(exchangeName, EXCHANGE_TYPE);
        for (String queueName : queueNames) {
            // declare all the queues
            channel.queueDeclare(queueName, true, false, false, null)
                    .getQueue();
            // bind all the queues to exchange
            channel.queueBind(queueName, exchangeName, "");
        }
    }

    public void publish(byte[] message) throws IOException {
        channel.basicPublish(exchangeName, "", null, message);
        System.out.println("[*]Publisher: Message Sent to Exchange:" + exchangeName + "");
    }

    /**
     * Publish Message to exchange
     *
     * @param message Message to be published
     * @throws IOException
     * @throws MessagingException
     */
    public void publishMessage(Message message) throws IOException,
            MessagingException {
        MessageExtract msgExtract = new MessageExtract(message);
        publish(msgExtract.getSerializedBytes());
    }

    /**
     * Publish Messages to exchange
     *
     * @param messages Messages to be published
     * @throws IOException
     * @throws MessagingException
     */
    public void publishMessages(Message[] messages) throws IOException,
            MessagingException {
        for (Message message : messages) {
            publishMessage(message);
        }
    }

    public void shutdown() throws IOException, TimeoutException {
        channel.close();
        connection.close();
    }

}