Package org.apache.airavata.wsmg.client.amqp.rabbitmq

Source Code of org.apache.airavata.wsmg.client.amqp.rabbitmq.AMQPBroadcastReceiverImpl

/*
*
* 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.wsmg.client.amqp.rabbitmq;

import com.rabbitmq.client.Channel;
import com.rabbitmq.client.Connection;
import com.rabbitmq.client.QueueingConsumer;
import org.apache.airavata.wsmg.client.amqp.*;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import java.util.Properties;

/**
* AMQPBroadcastReceiverImpl class provides functionality to consume a broadcast message feed.
*/
public class AMQPBroadcastReceiverImpl extends AMQPClient implements AMQPBroadcastReceiver {
    private static final Logger log = LoggerFactory.getLogger(AMQPBroadcastReceiverImpl.class);
   
    private AMQPCallback callback = null;

    public AMQPBroadcastReceiverImpl(Properties properties, AMQPCallback callback) {
        super(properties);

        this.callback = callback;
    }

    public void Subscribe() throws AMQPException {
        if (callback != null) {
            try {
                Connection connection = connectionFactory.newConnection();

                Channel channel = connection.createChannel();
                channel.exchangeDeclare(AMQPUtil.EXCHANGE_NAME_FANOUT, AMQPUtil.EXCHANGE_TYPE_FANOUT);

                String queueName = channel.queueDeclare().getQueue();
                channel.queueBind(queueName, AMQPUtil.EXCHANGE_NAME_FANOUT, "");

                QueueingConsumer consumer = new QueueingConsumer(channel);
                channel.basicConsume(queueName, true, consumer);

                while (true) {
                    QueueingConsumer.Delivery delivery = consumer.nextDelivery();
                    String message = new String(delivery.getBody());

                    callback.onMessage(message);
                }
            } catch (Exception e) {
                throw new AMQPException(e);
            }
        }
    }
}
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