Spring AMQP 集成 - 消费者手册 致谢

I am testing Spring-AMQP with Spring-Integration support, I've following configuration and test:

<rabbit:connection-factory id="connectionFactory" />
<rabbit:queue name="durableQ"/>
<int:channel id="consumingChannel">
    <int:queue capacity="2"/> <!-- Message get Acked as-soon-as filled in Q -->
</int:channel>

<int-amqp:inbound-channel-adapter 
    channel="consumingChannel"
    queue-names="durableQ" 
    connection-factory="connectionFactory"
    concurrent-consumers="1"
    acknowledge-mode="AUTO"
    />


public static void main(String[] args) {
System.out.println("Starting consumer with integration..");
    AbstractApplicationContext context = new ClassPathXmlApplicationContext(
    "classpath:META-INF/spring/integration/spring-integration-context-consumer.xml");

    PollableChannel consumingChannel = context.getBean("consumingChannel",   
                                                          PollableChannel.class);           
        int count = 0;
        while (true) {
            Message<?> msg = consumingChannel.receive(1000);
            System.out.println((count++) + " 	 -> " + msg);

            try { //sleep to check number of messages in queue
                Thread.sleep(50000);
            } catch (InterruptedException e) {
                e.printStackTrace();
            }
        }
    }

在此配置中，很明显，一旦消息到达 sumptionChannel，它们就会被确认并因此从队列中删除.我通过在 receive 之后放置一个高 sleep 并检查 queue-size 来验证这一点.没有进一步的控制.

// Below creates a default direct-channel (spring-integration channel) named "adapter", to receive poll this channel which is same as above
<int-amqp:inbound-channel-adapter id="adapter" listener-container="amqpListenerContainer" /> 

<bean id="amqpListenerContainer" class="org.springframework.amqp.rabbit.listener.SimpleMessageListenerContainer">
    <property name="connectionFactory" ref="connectionFactory" />
    <property name="queueNames" value="durableQ" />
    <property name="acknowledgeMode" value="MANUAL" />

// messageListener not allowed when using with adapter, so no way of having own ChannelAwareMessageListener, so no channel exposed onMessage, hence no way to ack
    <property name="messageListener" ref="listener"/>
</bean>
<bean id="listener" class="com.sd.springint.rmq.MsgListener"/>

    SubscribableChannel channel = context.getBean("fromRabbit", SubscribableChannel.class);

    channel.subscribe(new MessageHandler() {

        @Override
        public void handleMessage(Message<?> message) throws MessagingException {
            System.out.println("Got " + message);
        }
    });