Configures the behavior of
get() calls on
Query. By providing
a Source value, these methods can be configured to fetch results only from the server, only
from the local cache, or attempt to fetch results from the server and fall back to the cache
(which is the default).
Inherited Method Summary
|static <T extends Enum<T>> T|
public static final Source CACHE
Causes Firestore to immediately return a value from the cache, ignoring the server
completely (implying that the returned value may be stale with respect to the value on
the server). If there is no data in the cache to satisfy the
will return an error and
will return an empty
with no documents.
public static final Source DEFAULT
Causes Firestore to try to retrieve an up-to-date (server-retrieved) snapshot, but fall back to returning cached data if the server can't be reached.
public static final Source SERVER
Causes Firestore to avoid the cache, generating an error if the server cannot be reached. Note that the cache will still be updated if the server request succeeds. Also note that latency-compensation still takes effect, so any pending write operations will be visible in the returned data (merged into the server-provided data).