Question

我不明白SQS QueueListener是如何工作的。

这是我的配置：

    /**
     * AWS Credentials Bean
     */
    @Bean
    public AWSCredentials awsCredentials() {
        return new BasicAWSCredentials(accessKey, secretAccessKey);
    }

    /**
     * AWS Client Bean
     */
    @Bean
    public AmazonSQS amazonSQSAsyncClient() {
        AmazonSQS sqsClient = new AmazonSQSClient(awsCredentials());
        sqsClient.setRegion(Region.getRegion(Regions.US_EAST_1));
        return sqsClient;
    }

    /**
     * AWS Connection Factory
     */
    @Bean
    public SQSConnectionFactory connectionFactory() {
        SQSConnectionFactory.Builder factoryBuilder = new SQSConnectionFactory.Builder(
                Region.getRegion(Regions.US_EAST_1));
        factoryBuilder.setAwsCredentialsProvider(new AWSCredentialsProvider() {

            @Override
            public AWSCredentials getCredentials() {
                return awsCredentials();
            }

            @Override
            public void refresh() {
            }

        });
        return factoryBuilder.build();
    }

    /**
     * Registering QueueListener for queueName
     */
    @Bean
    public DefaultMessageListenerContainer defaultMessageListenerContainer() {
        DefaultMessageListenerContainer messageListenerContainer = new DefaultMessageListenerContainer();
        messageListenerContainer.setConnectionFactory(connectionFactory());
        messageListenerContainer.setDestinationName(queueName);
        messageListenerContainer.setMessageListener(new MessageListenerAdapter(new LabQueueListener()));
        messageListenerContainer.setErrorHandler(new QueueListenerErrorHandler());
        messageListenerContainer.setTaskExecutor(Executors.newFixedThreadPool(3));

        return messageListenerContainer;
    }

如您所见，我已将DefaultMessageListenerContainer配置为Executors.newFixedThreadPool(3)

这样我希望我的队列侦听器一次执行3个并发任务。

Thsi是我的倾听者逻辑：

public class QueueListener {

    public void handleMessage(String messageContent) {
        try {
            logger.info(String.format("message received: %s", messageContent));
            logger.info("wait 30 sec");
            Thread.sleep(1000 * 30);
            logger.info("done");
        } catch (Throwable th) {
            throw new QueueListenerException(messageContent, th);
        }
    }
}

现在每个handleMessage方法阻止（Thread.sleep(1000 * 30);）执行30秒，并且一次只执行1 handleMessage个方法。

我做错了什么？如何一次实现并发handleMessage方法调用？使用当前配置，我希望同时执行3 handleMessage。

Answer 1

您可以添加参数以通过添加messageListenerContainer.setConcurrency("3-10");来处理Bean中为DefaultMessageListenerConfigurator执行的并发执行。这意味着它将从3个线程开始并扩展到10. 也可以使用messageListenerContainer.setConcurrentConsumers(3);

来设置并发消费者的数量

参考：https://docs.spring.io/spring/docs/current/javadoc-api/org/springframework/jms/listener/DefaultMessageListenerContainer.html#setConcurrency-java.lang.String-

并发SQS队列侦听器

1 个答案: