ru.iris.common.messaging.JsonConnection.java Source code

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Here is the source code for ru.iris.common.messaging.JsonConnection.java

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/*
 * Copyright 2012-2014 Nikolay A. Viguro
 * <p/>
 * 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
 * <p/>
 * http://www.apache.org/licenses/LICENSE-2.0
 * <p/>
 * 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 ru.iris.common.messaging;

import com.rabbitmq.client.Channel;
import com.rabbitmq.client.Connection;
import com.rabbitmq.client.ConnectionFactory;
import org.apache.logging.log4j.LogManager;
import org.apache.logging.log4j.Logger;
import ru.iris.common.Config;

import java.io.IOException;
import java.util.concurrent.TimeoutException;

/**
 * Prototype for JSON message broadcasting.
 *
 * @author Nikolay A. Viguro, Tommi S.E. Laukkanen
 */

public class JsonConnection {

    private static final Logger LOGGER = LogManager.getLogger(JsonConnection.class);

    private Channel channel;

    /**
     * Singleton (On Demand Holder)
     */
    public static class SingletonHolder {
        public static final JsonConnection HOLDER_INSTANCE = new JsonConnection();
    }

    public static JsonConnection getInstance() {
        return SingletonHolder.HOLDER_INSTANCE;
    }

    public JsonConnection() {
        // Create a ConnectionFactory
        ConnectionFactory connectionFactory = new ConnectionFactory();

        // Create a Connection
        try {
            Config config = Config.getInstance();

            // Create a ConnectionFactory
            connectionFactory.setHost(config.get("AMQPhost"));
            connectionFactory.setPort(Integer.valueOf(config.get("AMQPport")));
            connectionFactory.setUsername(config.get("AMQPuser"));
            connectionFactory.setPassword(config.get("AMQPpasswd"));

            /*
              The AMQ connection.
             */
            Connection connection = connectionFactory.newConnection();
            channel = connection.createChannel();

            // Create exchange
            channel.exchangeDeclare("iris", "topic", true);
        } catch (IOException | TimeoutException e) {
            LOGGER.error("Error while connection to AMQP broker: " + e.getMessage());
            System.exit(1);
        }
    }

    public Channel getChannel() {
        return channel;
    }
}