MemLocker returns a Locker instance that uses a memcache lock bound to the current request ID.

DefaultCacheNamespace is the default datastore namespace for cache entries.

ErrDeleteCacheEntry is a sentinel error value that, if returned from a Handler's Refresh function, indicates that the cache key that is being refreshed is not necessary and should be deleted.

ErrFailedToLock is a sentinel error returned by Locker.TryWithLock if the lock is already held by another entity.

Cache defines a generic basic datastore cache.

Value is a cached value.

Handler is a cache handler for a specific type of data.

Locker is an interface to a generic locking function.