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

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Here is the source code for org.springframework.integration.amqp.channel.PublishSubscribeAmqpChannel.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.AnonymousQueue;
import org.springframework.amqp.core.Binding;
import org.springframework.amqp.core.BindingBuilder;
import org.springframework.amqp.core.FanoutExchange;
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.BroadcastingDispatcher;

/**
 * @author Mark Fisher
 * @author Gary Russell
 * @author Artem Bilan
 *
 * @since 2.1
 */
public class PublishSubscribeAmqpChannel extends AbstractSubscribableAmqpChannel {

    private volatile FanoutExchange exchange;

    private final Queue queue = new AnonymousQueue();

    private volatile Binding binding;

    /**
     * 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 PublishSubscribeAmqpChannel(String channelName, AbstractMessageListenerContainer container,
            AmqpTemplate amqpTemplate) {
        super(channelName, container, amqpTemplate, true);
    }

    /**
     * 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 PublishSubscribeAmqpChannel(String channelName, AbstractMessageListenerContainer container,
            AmqpTemplate amqpTemplate, AmqpHeaderMapper outboundMapper, AmqpHeaderMapper inboundMapper) {
        super(channelName, container, amqpTemplate, true, outboundMapper, inboundMapper);
    }

    /**
     * Configure the FanoutExchange instance. If this is not provided, then a
     * FanoutExchange will be declared implicitly, and its name will be the same
     * as the channel name prefixed by "si.fanout.". In either case, an effectively
     * anonymous Queue will be declared automatically.
     * @param exchange The fanout exchange.
     */
    public void setExchange(FanoutExchange exchange) {
        this.exchange = exchange;
    }

    @Override
    protected String getExchangeName() {
        return (this.exchange != null) ? this.exchange.getName() : "";
    }

    @Override
    protected String obtainQueueName(String channelName) {
        if (this.exchange == null) {
            String exchangeName = "si.fanout." + channelName;
            this.exchange = new FanoutExchange(exchangeName);
        }

        this.binding = BindingBuilder.bind(this.queue).to(this.exchange);

        return this.queue.getName();
    }

    @Override
    protected AbstractDispatcher createDispatcher() {
        BroadcastingDispatcher broadcastingDispatcher = new BroadcastingDispatcher(true);
        broadcastingDispatcher.setBeanFactory(this.getBeanFactory());
        return broadcastingDispatcher;
    }

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

}