com.trivago.mail.pigeon.daemon.Daemon.java Source code

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Here is the source code for com.trivago.mail.pigeon.daemon.Daemon.java

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/**
 * Copyright (C) 2011-2012 trivago GmbH <mario.mueller@trivago.com>, <christian.krause@trivago.com>
 *
 * 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 com.trivago.mail.pigeon.daemon;

import com.rabbitmq.client.Channel;
import com.rabbitmq.client.Connection;
import com.rabbitmq.client.QueueingConsumer;
import com.trivago.mail.pigeon.json.MailTransport;
import com.trivago.mail.pigeon.mail.MailFacade;
import com.trivago.mail.pigeon.queue.ConnectionPool;
import org.svenson.JSONParser;

import java.io.IOException;

public class Daemon {
    private static final String channelName = "messages";

    /**
     * Main Daemon method containing the event loop.
     *
     * @param args command line args
     * @throws java.io.IOException
     */
    public static void main(String[] args) throws IOException {

        Connection conn = null;
        Channel channel = null;

        try {
            conn = ConnectionPool.getConnection();
            channel = conn.createChannel();

            boolean autoAck = false;
            QueueingConsumer consumer = new QueueingConsumer(channel);
            channel.basicConsume(channelName, autoAck, consumer);
            MailFacade mailFacade = new MailFacade();

            while (true) {
                QueueingConsumer.Delivery delivery;
                try {
                    delivery = consumer.nextDelivery();
                } catch (InterruptedException ie) {
                    continue;
                }

                String jsonContent = new String(delivery.getBody());
                MailTransport mailTransport = JSONParser.defaultJSONParser().parse(MailTransport.class,
                        jsonContent);
                mailFacade.sendMail(mailTransport);
                channel.basicAck(delivery.getEnvelope().getDeliveryTag(), false);
            }

        } finally {
            if (channel != null) {
                channel.close();
            }
            if (conn != null) {
                conn.close();
            }
        }
    }
}