Source

public 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).

Summary

Enum Values

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).

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.

SERVER

Causes Cloud Firestore to avoid the cache, generating an error if the server cannot be reached.

Public methods

static Source

Returns the enum constant of this type with the specified name.

static Source[]

Returns an array containing the constants of this enum type, in the order they're declared.

Enum Values

CACHE

Source 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.

DEFAULT

Source 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.

SERVER

Source 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).

Public methods

valueOf

public static Source valueOf(String name)

Returns the enum constant of this type with the specified name. The string must match exactly an identifier used to declare an enum constant in this type. (Extraneous whitespace characters are not permitted.)

Returns
Source

the enum constant with the specified name

Throws
java.lang.IllegalArgumentException java.lang.IllegalArgumentException

if this enum type has no constant with the specified name

values

public static Source[] values()

Returns an array containing the constants of this enum type, in the order they're declared. This method may be used to iterate over the constants.

Returns
Source[]

an array containing the constants of this enum type, in the order they're declared