Scheduling executors

Earlier in this chapter, we discussed how the command-line runners can be used as a place to start the scheduled executor thread pools to run the worker threads in intervals. While that is certainly a possibility, Spring provides you with a more concise configuration to achieve the same goal: @EnableScheduling.

Getting ready

We will enhance our application so that it will print a count of books in our repository every 10 seconds. To achieve this, we will make the necessary modifications to the BookPubApplication and StartupRunner classes.

How to do it...

1. Let's add an @EnableScheduling annotation to the BookPubApplication class, as follows:

@SpringBootApplication 
@EnableScheduling 
public class BookPubApplication {...}

2. As a @Scheduled annotation can be placed only on methods without arguments, let's add a new run() method to the StartupRunner class and annotate it with the @Scheduled annotation, as shown in the following line:

@Scheduled(initialDelay = 1000, fixedRate = 10000...