mx.bigdata.utils.amqp.AMQPClientHelperImpl.java Source code

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Here is the source code for mx.bigdata.utils.amqp.AMQPClientHelperImpl.java

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/*
 *  Copyright 2010 BigData Mx
 *
 *  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 mx.bigdata.utils.amqp;

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

import mx.bigdata.anyobject.AnyObject;

public final class AMQPClientHelperImpl implements AMQPClientHelper {

    private static final int DEFAULT_QOS = 1000;

    private static final String DEFAULT_ROUTING_KEY = "-";

    private final AnyObject conf;

    public AMQPClientHelperImpl(AnyObject conf) {
        this.conf = conf;
    }

    public ConnectionFactory createConnectionFactory() throws Exception {
        return createConnectionFactory(null);
    }

    public ConnectionFactory createConnectionFactory(String key) throws Exception {
        ConnectionFactory factory = new ConnectionFactory();
        String username = getValueOrDefault("amqp_username", key);
        if (username != null) {
            factory.setUsername(username);
        }
        String password = getValueOrDefault("amqp_password", key);
        if (password != null) {
            factory.setPassword(password);
        }
        String virtualHost = getValueOrDefault("amqp_virtual_host", key);
        if (virtualHost != null) {
            factory.setVirtualHost(virtualHost);
        }
        String host = getValueOrDefault("amqp_host", key);
        if (host != null) {
            factory.setHost(host);
        }
        Integer port = getIntegerOrDefault("amqp_port", key);
        if (port != null) {
            factory.setPort(port);
        }
        return factory;
    }

    public Channel declareChannel(ConnectionFactory factory, String key) throws Exception {
        Connection conn = factory.newConnection();
        Channel channel = conn.createChannel();
        Integer basicQos = conf.getInteger("channel_basic_qos");
        if (basicQos != null) {
            channel.basicQos(basicQos);
        } else {
            channel.basicQos(DEFAULT_QOS);
        }
        channel.exchangeDeclare(getExchangeName(key), getExchangeType(key), true);
        return channel;
    }

    public String createQueue(Channel channel, String key) throws Exception {
        AMQP.Queue.DeclareOk result = channel.queueDeclare();
        String queue = result.getQueue();
        channel.queueBind(queue, getExchangeName(key), getRoutingKey(key));
        return queue;
    }

    @Deprecated
    public String createQueue(Channel channel, String key, boolean nonExclusive) throws Exception {
        return createNamedQueue(channel, key);
    }

    public String createNamedQueue(Channel channel, String key) throws Exception {
        return createQueue(channel, key, false, false, true);
    }

    public String createQueue(Channel channel, String key, boolean durable, boolean exclusive, boolean autoDelete)
            throws Exception {
        String queueName = getQueueName(key);
        channel.queueDeclare(queueName, durable, exclusive, autoDelete, null);
        channel.queueBind(queueName, getExchangeName(key), getRoutingKey(key));
        return queueName;
    }

    public String getRoutingKey() {
        return getRoutingKey(null);
    }

    public String getRoutingKey(String key) {
        String rk = getValueOrDefault("queue_routing_key", key);
        return (rk != null) ? rk : DEFAULT_ROUTING_KEY;
    }

    public String getExchangeName(String key) {
        return getValueOrDefault("exchange_name", key);
    }

    public String getExchangeType(String key) {
        return getValueOrDefault("exchange_type", key);
    }

    public String getQueueName(String key) {
        return getValueOrDefault("queue_name", key);
    }

    private String getValueOrDefault(String type, String key) {
        return conf.getString(type + ((key != null) ? "_" + key : ""));

    }

    private Integer getIntegerOrDefault(String type, String key) {
        return conf.getInteger(type + ((key != null) ? "_" + key : ""));
    }

    public QueueingConsumer createQueueingConsumer(Channel channel, String queue) throws Exception {
        QueueingConsumer consumer = new QueueingConsumer(channel);
        channel.basicConsume(queue, false, consumer);
        return consumer;
    }

    public byte[] getBodyAndAck(Channel channel, QueueingConsumer consumer) throws Exception {
        QueueingConsumer.Delivery delivery = consumer.nextDelivery();
        byte[] body = delivery.getBody();
        long deliveryTag = delivery.getEnvelope().getDeliveryTag();
        channel.basicAck(deliveryTag, true);
        return body;
    }

    public void ack(Channel channel, QueueingConsumer.Delivery delivery) throws Exception {
        long deliveryTag = delivery.getEnvelope().getDeliveryTag();
        channel.basicAck(deliveryTag, true);
    }

    public void reject(Channel channel, QueueingConsumer.Delivery delivery) throws Exception {
        long deliveryTag = delivery.getEnvelope().getDeliveryTag();
        channel.basicReject(deliveryTag, true);
    }
}