my api sometimes need cache data sometimes and sometimes not required?

Question

my service sometimes need cache data sometimes and sometimes not required , so i would like to write an method that could clear cache when not needed AND #could someone help me creating a restful, java 8 spring boot#

score 0 · Accepted Answer · answered Jul 18 '18 at 06:02

Spring provides annotations that can help you with that purpose. If you conditionally need caching, you could for example use the condition parameter of the @Cacheable annotation, for example:

@Cacheable(cacheNames="stuff", condition="#cached")
public List<Stuff> findAll(boolean cached) {
    // ...
}

In this case, if you call findAll(true), it will return the cached result, while if you call findAll(false), it will act as if the annotation isn't there.

Creating a REST API from it isn't that difficult, since your cached parameter could come from a request parameter as well:

@GetMapping("/api/stuff")
@Cacheable(cacheNames="stuff", condition="#cached")
public List<Stuff> findAll(@RequestParam boolean cached) {
    // ...
}

Additionally, if you want to clear the cache, you can use the @CacheEvict annotation:

@CacheEvict("stuff")
public void clearCache() {
}

And just like before, you can turn this is an endpoint:

 @DeleteMapping("/api/stuff/cache")
 @CacheEvict("stuff")
 @ResponseStatus(HttpStatus.NO_CONTENT)
 public void clearCache() {

 }

so there is no need to write any code in clearcache(){...............}? — Srujan Batchu, Jul 18 '18 at 15:10
The `@CacheEvict` clears the cache for you, so basically you don't need any code indeed. — g00glen00b, Jul 18 '18 at 19:22

my api sometimes need cache data sometimes and sometimes not required?

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