com.vmware.vhadoop.adaptor.rabbit.RabbitConnection.java Source code

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/***************************************************************************
* Copyright (c) 2013 VMware, Inc. All Rights Reserved.
* 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.
***************************************************************************/

/***************************************************************************
 * Copyright (c) 2012 VMware, Inc. All Rights Reserved.
 * 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.vmware.vhadoop.adaptor.rabbit;

import java.io.IOException;

import com.rabbitmq.client.Channel;
import com.rabbitmq.client.Connection;
import com.rabbitmq.client.ConnectionFactory;
import com.rabbitmq.client.QueueingConsumer;

/**
 * Encapsulates the details of connecting to a RabbitMQ queue
 *
 */
public class RabbitConnection {

    interface RabbitCredentials {
        public String getHostName();

        public String getExchangeName();

        public String getRouteKeyCommand();

        public String getRouteKeyStatus();
    }

    private ConnectionFactory _connectionFactory;
    private RabbitCredentials _credentials;
    private Channel _channel;

    public RabbitConnection(RabbitCredentials credentials) {
        _credentials = credentials;
        _connectionFactory = new ConnectionFactory();
        _connectionFactory.setHost(credentials.getHostName());
    }

    /* TODO: Can we cache the consumer object? */
    QueueingConsumer getConsumer() {
        try {
            Connection connection = _connectionFactory.newConnection();
            _channel = connection.createChannel();

            String exchangeName = _credentials.getExchangeName();
            _channel.exchangeDeclare(exchangeName, "direct", true, false, null); /* TODO: Externalize? */
            String queueName = _channel.queueDeclare().getQueue();
            _channel.queueBind(queueName, exchangeName, _credentials.getRouteKeyCommand());

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

        } catch (Exception e) {
            throw new RuntimeException("Unable to get message consumer", e);
        }
    }

    void sendMessage(byte[] data) {
        try {
            if (_channel != null) {
                _channel.basicPublish(_credentials.getExchangeName(), _credentials.getRouteKeyStatus(), null, data);
            }
        } catch (IOException e) {
            throw new RuntimeException("Unable to send message", e);
        }
    }
}