SpringCache @Caching Anotasyonu

Açıklaması şöyle

@Caching : Regroups multiple cache operations to be applied on a method

evict Alanı

Açıklaması şöyle

@Caching: Java doesn’t allow you to use the same annotation type twice in a method or class. So, if you want to say @CacheEvict in two different caches in the same method @Cacheable can be used to aggregate other cache annotations.

Örnek

Şöyle yaparız

@Caching(evict = {
  @CacheEvict(“address”), 
  @CacheEvict(value=“employee”, key=”#employee.id”)
})
public Employee getEmployee(Employee employee) {
  // some code
}

Örnek

Şöyle yaparız. Burada aynı anda iki cache'ten birden silme işlemi olduğu için @Caching kullanılıyor

@RestController("/")
public class TodoListController {

  private ToDoList sample = new ToDoList(1, new ArrayList<ToDo>(Arrays.asList(
    new ToDo(1, "Comment", false), 
    new ToDo(2, "Clap", false),
    new ToDo(3, "Follow Author", false))), false);

	
  @DeleteMapping("/todo/{id}")
  @Caching(evict = {
    @CacheEvict(value = "todo-single", key = "#id"),
    @CacheEvict(value="todo-list", key="'getList'")
  })
  public void deleteToDo(@PathVariable("id") long id) throws Exception {
    Optional<ToDo> item = sample.getTasks().stream()
      .filter(x -> x.getId() == id).findFirst();
    if (item.isPresent()) {
      sample.getTasks().remove(item.get());
    } else {
      throw new Exception("To Do item not found");
    }
  }
}

Geri kalan kodları şöyle yaparız

@Cacheable(value = "todo-list" , key="'getList'")
@GetMapping
public ToDoList getList() {
  return sample;
}

@Cacheable(value = "todo-single", key = "#id")
@GetMapping("/todo/{id}")
public Optional<ToDo> getToDo(@PathVariable("id") long id) {
  return sample.getTasks().stream().filter(x -> x.getId() == id).findFirst();
}

@PutMapping("/todo")
@CachePut(value = "todo-single", key = "#toDo.id")
@CacheEvict(value="todo-list" , key="'getList'")
public ToDoList addToDo(@RequestBody ToDo toDo) {
  sample.getTasks().add(toDo);
  return sample;
}

@PostMapping("/todo/{id}")
@CachePut(value = "todo-single", key = "#id")
@CacheEvict(value="todo-list", key="'getList'")
public ToDo updateToDo(@PathVariable("id") long id, @RequestBody ToDo toDo)
throws Exception {
  Optional<ToDo> item = sample.getTasks().stream()
    .filter(x -> x.getId() == id).findFirst();
  if (item.isPresent()) {
    item.get().setCompleted(toDo.isCompleted());
    return item.get();
  } else {
    throw new Exception("To Do item not found");
  }
}

Ve şöyle yaparız

@DeleteMapping("/todo/{id}")
@Caching(evict = {
  @CacheEvict(value = "todo-single", key = "#id"),
  @CacheEvict(value="todo-list", key="'getList'")
})
public void deleteToDo(@PathVariable("id") long id) throws Exception {
  Optional<ToDo> item = sample.getTasks().stream()
    .filter(x -> x.getId() == id).findFirst();
  if (item.isPresent()) {
    sample.getTasks().remove(item.get());
  } else {
    throw new Exception("To Do item not found");
  }
}