spring - SimpleMessageListenerContainer Amazon SQS 轮询间隔

Question

我正在使用 Spring Cloud 库来轮询 SQS。如何设置轮询间隔？

@Bean
@Primary
public AmazonSQSAsync amazonSQSAsync() {
    return AmazonSQSAsyncClientBuilder.standard().
            withCredentials(awsCredentialsProvider()).
            withClientConfiguration(clientConfiguration()).
            build();
}


@Bean
@ConfigurationProperties(prefix = "aws.queue")
public SimpleMessageListenerContainer simpleMessageListenerContainer(AmazonSQSAsync amazonSQSAsync) {
    SimpleMessageListenerContainer simpleMessageListenerContainer = new SimpleMessageListenerContainer();
    simpleMessageListenerContainer.setAmazonSqs(amazonSQSAsync);
    simpleMessageListenerContainer.setMessageHandler(queueMessageHandler());
    simpleMessageListenerContainer.setMaxNumberOfMessages(10);
    simpleMessageListenerContainer.setTaskExecutor(threadPoolTaskExecutor());
    return simpleMessageListenerContainer;
}


@Bean
public QueueMessageHandler queueMessageHandler() {
    QueueMessageHandlerFactory queueMessageHandlerFactory = new QueueMessageHandlerFactory();
    queueMessageHandlerFactory.setAmazonSqs(amazonSQSAsync());
    QueueMessageHandler queueMessageHandler = queueMessageHandlerFactory.createQueueMessageHandler();
    return queueMessageHandler;
}


@Bean
public ThreadPoolTaskExecutor threadPoolTaskExecutor() {
    ThreadPoolTaskExecutor executor = new ThreadPoolTaskExecutor();
    executor.setCorePoolSize(10);
    executor.setMaxPoolSize(10);
    executor.setThreadNamePrefix("oaoQueueExecutor");
    executor.initialize();
    return executor;
}

Answer 1

调用org.springframework.cloud.aws.messaging.listener中基类AbstractMessageListenerContainer的setWaitTimeOut(N)函数。 N 是长轮询超时(以秒为单位)。例如，如果您想在返回之前等待 5 秒，请在queueMessageHandler() 函数中使用以下代码行。如果不调用此函数，则默认为 1 秒。最大长轮询超时为 20 秒，因此您可以为此函数指定的最大值为 20，这意味着“等待 20 秒”

simpleMessageListenerContainer.setWaitTimeOut (5);

源代码在这里:https://github.com/spring-cloud/spring-cloud-aws/blob/master/spring-cloud-aws-messaging/src/main/java/org/springframework/cloud/aws/messaging/listener/AbstractMessageListenerContainer.java

/**
     * Configures the wait timeout that the poll request will wait for new message to arrive if the are currently no
     * messages on the queue. Higher values will reduce poll request to the system significantly.
     *
     * @param waitTimeOut
     *         - the wait time out in seconds
     */
    public void setWaitTimeOut(Integer waitTimeOut) {
        this.waitTimeOut = waitTimeOut;
    }