记忆快取中的实体金钥是否与资料储存库中的实体金钥相同

Question

When I set the key of a memcache entity like this

 syncCache.put(entityKey, entity);

where

 entityKey = entity.getKey();
 entityKeyIdFromDataStore = entityKey.getId();

and afterwards I retrieve the entity stored in memcache and retrieve the key id

 entity = (Entity) syncCache.get(entityKey);
 entityKeyIdFromCache = entity.getKey().getId();

will entityKeyIdFromDataStore and entityKeyIdFromCache be the same then?

Answer 1

Yes, it will be the same. Note that you can use an ID instead of a key:

syncCache.put(entityKey.getId(), entity);
entity = (Entity) syncCache.get(entityKey.getId());

An ID is much shorter than a key. This, of course, only works with entities that don't have parents, or if you store only one entity kind in Memcache.