How to bootstrap caching in dependency module in Springboot?

Question

I have a module that defines caches as per similar to this blog, which is being brought in as a dependency in another module.
However the caching isn't being bootstrapped in the main application. How do I configure springboot app to bootstrap the cache(s) defined in the dependency?

Answer 1

Caching happens on two possible scenario

1. On Method Invocation
2. Manually Put the object in the cache

going by the example in your question, let's understand the method below

@Service
public class NumberService {

    // ...
    @Cacheable(
      value = "squareCache", 
      key = "#number", 
      condition = "#number>10")
    public BigDecimal square(Long number) {
        BigDecimal square = BigDecimal.valueOf(number)
          .multiply(BigDecimal.valueOf(number));
        log.info("square of {} is {}", number, square);
        return square;
    }
}

The method square will cache the result for all inputs(let's say 1 to 10 ) if you want it to cache square of all possible input values, all you need to do call the method with all possible value. You can do this at startup.

This URL How to load @Cache on startup in spring? will help you

Below is one sample

@Service
public class NumberCacheScheduler {
    @Autowired
    NumberService numberService;


    @PostConstruct
    public void init() {
        update();

    }

    public void update() {
        for (long l=1l; i <=10,l++) {
            numberService.square(l);
        }
    }
}