FirebaseFirestore

public class FirebaseFirestore extends Object

Represents a Cloud Firestore database and is the entry point for all Cloud Firestore operations.

Subclassing Note: Cloud Firestore classes are not meant to be subclassed except for use in test mocks. Subclassing is not supported in production code and new SDK releases may break code that does so.

Public Method Summary

ListenerRegistration	addSnapshotsInSyncListener(Runnable runnable) Attaches a listener for a snapshots-in-sync event.
ListenerRegistration	addSnapshotsInSyncListener(Executor executor, Runnable runnable) Attaches a listener for a snapshots-in-sync event.
ListenerRegistration	addSnapshotsInSyncListener(Activity activity, Runnable runnable) Attaches a listener for a snapshots-in-sync event.
WriteBatch	batch() Creates a write batch, used for performing multiple writes as a single atomic operation.
Task<Void>	clearPersistence() Clears the persistent storage, including pending writes and cached documents.
CollectionReference	collection(String collectionPath) Gets a `CollectionReference` instance that refers to the collection at the specified path within the database.
Query	collectionGroup(String collectionId) Creates and returns a new `Query` that includes all documents in the database that are contained in a collection or subcollection with the given `collectionId`.
Task<Void>	disableNetwork() Disables network access for this instance.
DocumentReference	document(String documentPath) Gets a `DocumentReference` instance that refers to the document at the specified path within the database.
Task<Void>	enableNetwork() Re-enables network usage for this instance after a prior call to `disableNetwork()`.
FirebaseApp	getApp() Returns the FirebaseApp instance to which this `FirebaseFirestore` belongs.
FirebaseFirestoreSettings	getFirestoreSettings() Returns the settings used by this `FirebaseFirestore` object.
static FirebaseFirestore	getInstance()
static FirebaseFirestore	getInstance(FirebaseApp app)
Task<Void>	runBatch(WriteBatch.Function batchFunction) Executes a batchFunction on a newly created `WriteBatch` and then commits all of the writes made by the batchFunction as a single atomic unit.
<TResult> Task<TResult>	runTransaction(Function<TResult> updateFunction) Executes the given updateFunction and then attempts to commit the changes applied within the transaction.
void	setFirestoreSettings(FirebaseFirestoreSettings settings) Sets any custom settings used to configure this `FirebaseFirestore` object.
static void	setLoggingEnabled(boolean loggingEnabled) Globally enables / disables Cloud Firestore logging for the SDK.
Task<Void>	terminate() Terminates this `FirebaseFirestore` instance.
void	useEmulator(String host, int port) Modifies this FirebaseDatabase instance to communicate with the Cloud Firestore emulator.
Task<Void>	waitForPendingWrites() Waits until all currently pending writes for the active user have been acknowledged by the backend.

Inherited Method Summary

From class java.lang.Object

Object	clone()
boolean	equals(Object arg0)
void	finalize()
final Class<?>	getClass()
int	hashCode()
final void	notify()
final void	notifyAll()
String	toString()
final void	wait(long arg0, int arg1)
final void	wait(long arg0)
final void	wait()

Public Methods

public ListenerRegistration addSnapshotsInSyncListener (Runnable runnable)

Attaches a listener for a snapshots-in-sync event. The snapshots-in-sync event indicates that all listeners affected by a given change have fired, even if a single server-generated change affects multiple listeners.

NOTE: The snapshots-in-sync event only indicates that listeners are in sync with each other, but does not relate to whether those snapshots are in sync with the server. Use SnapshotMetadata in the individual listeners to determine if a snapshot is from the cache or the server.

Parameters

runnable	A callback to be called every time all snapshot listeners are in sync with each other.

Returns

A registration object that can be used to remove the listener.

public ListenerRegistration addSnapshotsInSyncListener (Executor executor, Runnable runnable)

Parameters

executor	The executor to use to call the listener.
runnable	A callback to be called every time all snapshot listeners are in sync with each other.

Returns

A registration object that can be used to remove the listener.

public ListenerRegistration addSnapshotsInSyncListener (Activity activity, Runnable runnable)

Parameters

activity	The activity to scope the listener to.
runnable	A callback to be called every time all snapshot listeners are in sync with each other.

Returns

A registration object that can be used to remove the listener.

public WriteBatch batch ()

Creates a write batch, used for performing multiple writes as a single atomic operation.

The maximum number of writes allowed in a single batch is 500, but note that each usage of serverTimestamp(), arrayUnion(Object), arrayRemove(Object), or increment(long) inside a transaction counts as an additional write.

Returns

The created WriteBatch object.

public Task<Void> clearPersistence ()

Clears the persistent storage, including pending writes and cached documents.

Must be called while the FirebaseFirestore instance is not started (after the app is shutdown or when the app is first initialized). On startup, this method must be called before other methods (other than setFirestoreSettings(FirebaseFirestoreSettings)). If the FirebaseFirestore instance is still running, the Task will fail with an error code of FAILED_PRECONDITION.

Note: clearPersistence() is primarily intended to help write reliable tests that use Cloud Firestore. It uses an efficient mechanism for dropping existing data but does not attempt to securely overwrite or otherwise make cached data unrecoverable. For applications that are sensitive to the disclosure of cached data in between user sessions, we strongly recommend not enabling persistence at all.

Returns

A Task that is resolved when the persistent storage is cleared. Otherwise, the Task is rejected with an error.

public CollectionReference collection (String collectionPath)

Gets a CollectionReference instance that refers to the collection at the specified path within the database.

Parameters

collectionPath	A slash-separated path to a collection.

Returns

The CollectionReference instance.

public Query collectionGroup (String collectionId)

Creates and returns a new Query that includes all documents in the database that are contained in a collection or subcollection with the given collectionId.

Parameters

collectionId	Identifies the collections to query over. Every collection or subcollection with this ID as the last segment of its path will be included. Cannot contain a slash.

Returns

The created Query.

public Task<Void> disableNetwork ()

Disables network access for this instance. While the network is disabled, any snapshot listeners or get() calls will return results from cache, and any write operations will be queued until network usage is re-enabled via a call to enableNetwork().

Returns

A Task that will be completed once networking is disabled.

public DocumentReference document (String documentPath)

Gets a `DocumentReference` instance that refers to the document at the specified path within the database.

Parameters

documentPath	A slash-separated path to a document.

Returns

The DocumentReference instance.

public Task<Void> enableNetwork ()

Re-enables network usage for this instance after a prior call to disableNetwork().

Returns

A Task that will be completed once networking is enabled.

public FirebaseApp getApp ()

Returns the FirebaseApp instance to which this FirebaseFirestore belongs.

public FirebaseFirestoreSettings getFirestoreSettings ()

Returns the settings used by this FirebaseFirestore object.

public static FirebaseFirestore getInstance ()

public static FirebaseFirestore getInstance (FirebaseApp app)

public Task<Void> runBatch (WriteBatch.Function batchFunction)

Executes a batchFunction on a newly created WriteBatch and then commits all of the writes made by the batchFunction as a single atomic unit.

Parameters

batchFunction	The function to execute within the batch context.

Returns

A Task that will be resolved when the batch has been committed.

public Task<TResult> runTransaction (Function<TResult> updateFunction)

Executes the given updateFunction and then attempts to commit the changes applied within the transaction. If any document read within the transaction has changed, the updateFunction will be retried. If it fails to commit after 5 attempts, the transaction will fail.

Parameters

updateFunction	The function to execute within the transaction context.

Returns

The task returned from the updateFunction.

public void setFirestoreSettings (FirebaseFirestoreSettings settings)

Sets any custom settings used to configure this FirebaseFirestore object. This method can only be called before calling any other methods on this object.

public static void setLoggingEnabled (boolean loggingEnabled)

Globally enables / disables Cloud Firestore logging for the SDK.

public Task<Void> terminate ()

Terminates this FirebaseFirestore instance.

After calling terminate() only the clearPersistence() method may be used. Any other method will throw an IllegalStateException.

To restart after termination, simply create a new instance of FirebaseFirestore with getInstance() or getInstance(FirebaseApp).

terminate() does not cancel any pending writes and any tasks that are awaiting a response from the server will not be resolved. The next time you start this instance, it will resume attempting to send these writes to the server.

Note: Under normal circumstances, calling terminate() is not required. This method is useful only when you want to force this instance to release all of its resources or in combination with clearPersistence() to ensure that all local state is destroyed between test runs.

Returns

A Task that is resolved when the instance has been successfully terminated.

public void useEmulator (String host, int port)

Modifies this FirebaseDatabase instance to communicate with the Cloud Firestore emulator.

Note: Call this method before using the instance to do any database operations.

Parameters

host	the emulator host (for example, 10.0.2.2)
port	the emulator port (for example, 8080)

public Task<Void> waitForPendingWrites ()

Waits until all currently pending writes for the active user have been acknowledged by the backend.

The returned Task completes immediately if there are no outstanding writes. Otherwise, the Task waits for all previously issued writes (including those written in a previous app session), but it does not wait for writes that were added after the method is called. If you wish to wait for additional writes, you have to call waitForPendingWrites() again.

Any outstanding waitForPendingWrites() Tasks are cancelled during user changes.

Returns

A Task which resolves when all currently pending writes have been acknowledged by the backend.