org.springframework.integration.amqp.channel.PointToPointSubscribableAmqpChannel.java Source code

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Here is the source code for org.springframework.integration.amqp.channel.PointToPointSubscribableAmqpChannel.java

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/*
 * Copyright 2002-2019 the original author or authors.
 *
 * 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
 *
 *      https://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.springframework.integration.amqp.channel;

import org.springframework.amqp.core.AmqpAdmin;
import org.springframework.amqp.core.AmqpTemplate;
import org.springframework.amqp.core.Queue;
import org.springframework.amqp.rabbit.listener.AbstractMessageListenerContainer;
import org.springframework.integration.amqp.support.AmqpHeaderMapper;
import org.springframework.integration.dispatcher.AbstractDispatcher;
import org.springframework.integration.dispatcher.RoundRobinLoadBalancingStrategy;
import org.springframework.integration.dispatcher.UnicastingDispatcher;

/**
 * @author Mark Fisher
 * @author Artem Bilan
 *
 * @since 2.1
 */
public class PointToPointSubscribableAmqpChannel extends AbstractSubscribableAmqpChannel {

    private volatile Queue queue;

    /**
     * Construct an instance with the supplied name, container and template; default header
     * mappers will be used if the message is mapped.
     * @param channelName the channel name.
     * @param container the container.
     * @param amqpTemplate the template.
     * @see #setExtractPayload(boolean)
     */
    public PointToPointSubscribableAmqpChannel(String channelName, AbstractMessageListenerContainer container,
            AmqpTemplate amqpTemplate) {
        super(channelName, container, amqpTemplate);
    }

    /**
     * Construct an instance with the supplied name, container and template; default header
     * mappers will be used if the message is mapped.
     * @param channelName the channel name.
     * @param container the container.
     * @param amqpTemplate the template.
     * @param outboundMapper the outbound mapper.
     * @param inboundMapper the inbound mapper.
     * @see #setExtractPayload(boolean)
     * @since 4.3
     */
    public PointToPointSubscribableAmqpChannel(String channelName, AbstractMessageListenerContainer container,
            AmqpTemplate amqpTemplate, AmqpHeaderMapper outboundMapper, AmqpHeaderMapper inboundMapper) {
        super(channelName, container, amqpTemplate, outboundMapper, inboundMapper);
    }

    /**
     * Provide a Queue name to be used. If this is not provided,
     * the Queue's name will be the same as the channel name.
     * @param queueName The queue name.
     */
    public void setQueueName(String queueName) {
        this.queue = new Queue(queueName);
    }

    @Override
    protected String obtainQueueName(String channelName) {
        if (this.queue == null) {
            this.queue = new Queue(channelName);
        }

        return this.queue.getName();
    }

    @Override
    protected AbstractDispatcher createDispatcher() {
        UnicastingDispatcher unicastingDispatcher = new UnicastingDispatcher();
        unicastingDispatcher.setLoadBalancingStrategy(new RoundRobinLoadBalancingStrategy());
        return unicastingDispatcher;
    }

    @Override
    protected String getRoutingKey() {
        return this.queue != null ? this.queue.getName() : super.getRoutingKey();
    }

    @Override
    protected void doDeclares() {
        AmqpAdmin admin = getAdmin();
        if (admin != null && this.queue != null && admin.getQueueProperties(this.queue.getName()) == null) {
            admin.declareQueue(this.queue);
        }
    }

}