Configure SqsListener as Long Pooling

Question

I am implementing a SQS subscriber using spring boot and after a few research on internet I have found the project spring-cloud.

Use the annotation @SqsListener looks pretty easy to receive messages from a topic but I would like to implement it as Long Pooling instead of short pooling that receives every message as soon it arrives.

    @SqsListener(
        value = ["queue"],
        deletionPolicy = SqsMessageDeletionPolicy.ON_SUCCESS
    )
    fun subscribeToSSmsg: String) {
    ....
    }

This is working smooth but I would like to receive messages using long pooling. Is there any way to do it using spring-cloud?

user_4601120 · Answer

With AWS Java SDK 1.X.

You need to define a custom org.springframework.cloud.aws.messaging.config.SimpleMessageListenerContainerFactory bean which would need a com.amazonaws.services.sqs.AmazonSQSAsync bean.

Add the below beans to your configuration.

@Bean
public SimpleMessageListenerContainerFactory simpleMessageListenerContainerFactory(AmazonSQSAsync amazonSqs) {
    SimpleMessageListenerContainerFactory factory = new SimpleMessageListenerContainerFactory();
    factory.setWaitTimeOut(20); //Long polling, the maximum value of 20 seconds
    factory.setAmazonSqs(amazonSqs);
    factory.setMaxNumberOfMessages(10); //The maximum number of messages you want to read in a single poll
    return factory;
}

@Bean
@Primary
AmazonSQSAsync amazonSQSAsync(AWSCredentialsProvider credentialsProvider) {
    return new AmazonSQSBufferedAsyncClient(
        AmazonSQSAsyncClientBuilder
            .standard()
            .withRegion("region") //Set an appropriate region
            .withCredentials(credentialsProvider)
            .build());
}

Also ensure the HTTP clients you are using has a higher timeout than the value you set for the long polling.

Configure SqsListener as Long Pooling

1 Answers