com.nesscomputing.amqp.ExchangeConsumer.java Source code

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Here is the source code for com.nesscomputing.amqp.ExchangeConsumer.java

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/**
 * Copyright (C) 2012 Ness Computing, Inc.
 *
 * 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.nesscomputing.amqp;

import java.io.IOException;

import javax.annotation.Nonnull;

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

/**
 * A general runnable that will keep the connection to an exchange alive and dispatch messages
 * received on the exchange to an instance that implements {@link ConsumerCallback}.
 */
public final class ExchangeConsumer extends AbstractConsumer {
    private final String routingKey;

    public ExchangeConsumer(@Nonnull final ConnectionFactory connectionFactory,
            @Nonnull final AmqpConfig amqpConfig, @Nonnull final String name,
            @Nonnull final ConsumerCallback consumerCallback) {
        super(connectionFactory, amqpConfig, name, consumerCallback);

        this.routingKey = amqpConfig.getRoutingKey();
    }

    @Override
    protected String getServiceType() {
        return "exchange-consumer";
    }

    @Override
    protected void connectCallback(@Nonnull final Channel channel) throws IOException {
        super.connectCallback(channel);

        if (getConfig().isDeclaring()) {
            channel.exchangeDeclare(getName(), getConfig().getExchangeType(), getConfig().isDurable(),
                    getConfig().isAutoDelete(), null);
        }
        final String queueName = channel.queueDeclare().getQueue();

        channel.queueBind(queueName, getName(), routingKey);

        channel.basicConsume(queueName, false, getConsumer());
    }
}