Use @Cacheable for non-argument method in Spring

Question

I'm using Spring cache API and was stuck with a problem: I have a Dao class with CRUD operations and all I want to do is to cache a no-argument method which returns me a Map of objects (Key - id, Value - entity)

class Dao implements IDao<Entity>{

    public Map<Integer, Entity> getAllEntities(){ /* retreiving from DB */ }

    public Entity getEntityByKey(Object key) { ... }

    public void insert(Entity entity){...}

    public void update(Entity entity){...}

    public void delete(Entity entity){...}

}

Can anybody tell me how exactly (and correctly) can I cache getAllEntities() method to get entities, cache getEntityByKey to get Entity by key and also to be able to update cache when I perform create, update or delete operations ? And is it possible to use cacheable version of the method getAllEntities after update (using operations insert, update, delete) ?

Answer 1

try this

class Dao implements IDao<Entity>{

    @Cacheable(value = "entity.all")
    public Map<Integer, Entity> getAllEntities(){ /* retreiving from DB */ }

    @Cacheable(value = "entity.item", key="#p0")
    public Entity getEntityByKey(Object key) { ... }

    @CacheEvict(value = {"entity.all", "entity.item"}, allEntries=true)
    public void insert(Entity entity){...}

    @CacheEvict(value = {"entity.all", "entity.item"}, allEntries=true)
    public void update(Entity entity){...}

    @CacheEvict(value = {"entity.all", "entity.item"}, allEntries=true)
    public void delete(Entity entity){...}

}