Question

我有一个使用以下依赖项的示例应用程序：

<dependency>
    <groupId>org.springframework.amqp</groupId>
    <artifactId>spring-amqp</artifactId>
    <version>1.4.5.RELEASE</version>
</dependency>

我有一个像这样配置的兔子发件人：

<!-- Create rabbitMQ connection factory -->
    <rabbit:connection-factory id="rabbitConnectionFactory"
        cache-mode="${rabbitmq.cacheMode}" channel-cache-size="${rabbitmq.channelCacheSize}"
        host="${rabbitmq.host}" username="${rabbitmq.username}" password="${rabbitmq.password}"
        port="${rabbitmq.port}" />

    <bean id="amqpTemplate" class="org.springframework.amqp.rabbit.core.RabbitTemplate"
        scope="prototype">
        <property name="connectionFactory" ref="rabbitConnectionFactory" />
        <property name="channelTransacted" value="true" />
        <property name="exchange" value="wfExchange" />
        <property name="routingKey" value="abcd" />
    </bean>

从属性文件中读取配置值。一个听众配置如下：

    <!-- Enable Annotation Driven Configuration -->
    <rabbit:connection-factory id="rabbitConnectionFactory"
        cache-mode="${rabbitmq.cacheMode}" channel-cache-size="${rabbitmq.channelCacheSize}"
        host="${rabbitmq.host}" username="${rabbitmq.username}" password="${rabbitmq.password}"
        port="${rabbitmq.port}" />

    <!-- this bean looks for beans of type Queue, Exchange and Binding and declares 
        them to the broker -->
    <rabbit:admin connection-factory="rabbitConnectionFactory"
        auto-startup="true" />

    <!-- define event queue -->
    <rabbit:queue name="abcd" auto-delete="false"
        durable="true" exclusive="false" auto-declare="true">
    </rabbit:queue>

    <rabbit:direct-exchange name="wfExchange"
        durable="true" auto-delete="false">
        <rabbit:bindings>
            <rabbit:binding queue="abcd" key="abcd" />
        </rabbit:bindings>
    </rabbit:direct-exchange>

    <!-- Instantiate event listener and listener container -->
    <bean id="eventListener" class="com.sample.Listener" />

    <rabbit:listener-container id="eventListenerContainer"
        connection-factory="rabbitConnectionFactory" prefetch="10" acknowledge="manual">
        <rabbit:listener ref="eventListener" queue-names="abcd" />

    </rabbit:listener-container>

</beans>

在应用程序上下文配置中，我正在加载：

<import resource="classpath:spring/sender.xml" />
<import resource="classpath:spring/listener.xml" />

运行我的应用程序后，循环发送10条消息：

for(int i=0; i<10; i++) {
            String messageBody = "Hello number: " + (i+1);

            Message message1 = MessageBuilder
                    .withBody(messageBody.getBytes())
                    .build();

            System.out.println("Message before send: "+messageBody+ " at "+ new Date().getTime());
            entryPoint.user1.getRabbitTemplate().send(message1);
            System.out.println("Message sent: "+messageBody+ " at "+ new Date().getTime());
        }

我的听众代码是：

@Override
    public void onMessage(Message message, Channel channel) throws Exception {

        System.out.println("Received the message: " + new String(message.getBody()) + " at " + 
                                    new Date().getTime());
        messageList.add(message);

        channel.basicAck(message.getMessageProperties().getDeliveryTag(), false);
    }

注意： 1. RabbitTemplate已配置为： this.rabbitTemplate.setRoutingKey（ “ABCD”）; this.rabbitTemplate.setExchange（ “wfExchange”）;

RabbitMQ安装版本 - 3.5.4
rabbitmq.cacheMode = CHANNEL rabbitmq.channelCacheSize = 10

多次运行后的观察结果如下： send（）在20-40毫秒后返回，即使在侦听器收到消息之后也是如此。为什么发送会花这么多时间回来？它正在减慢我的申请速度。 send（）有什么其他功能吗？如何减少send（）的开销？

Answer 1

我没有看到它需要40ms，但RabbitMQ的交易速度非常慢。在发送上禁用事务并使用发布者确认/返回要快得多。

amqp.rabbit.core.RabbitTemplate.send（消息消息）在20-40毫秒后返回，即使在侦听器收到它之后也是如此。如何使send（）更快？

1 个答案: