What Is the Purpose of Queuemessagehandler

What is the purpose of QueueMessageHandler in the code pasted below? The queueMessageHandler doesn't seem to perform much in the example below.

@Bean
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;
}