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public final enum Source extends Enum<Source>

Configures the behavior of get() calls on DocumentReference and 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

Enum Values

public static final Source CACHE

Causes Cloud 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 get() call, get() will return an error and get() will return an empty QuerySnapshot with no documents.

public static final Source DEFAULT

Causes Cloud 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 Cloud 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).