Examples with AsyncEventListener com.google.firebase.firestore.core.AsyncEventListener used on opensource projects

Example 1 with AsyncEventListener

use of com.google.firebase.firestore.core.AsyncEventListener in project firebase-android-sdk by firebase.

the class DocumentReference method addSnapshotListenerInternal.

/**
 * Internal helper method to create add a snapshot listener.
 *
 * <p>Will be Activity scoped if the activity parameter is non-{@code null}.
 *
 * @param userExecutor The executor to use to call the listener.
 * @param options The options to use for this listen.
 * @param activity Optional activity this listener is scoped to.
 * @param userListener The user-supplied event listener that will be called with document
 *     snapshots.
 * @return A registration object that can be used to remove the listener.
 */
private ListenerRegistration addSnapshotListenerInternal(Executor userExecutor, ListenOptions options, @Nullable Activity activity, EventListener<DocumentSnapshot> userListener) {
    // Convert from ViewSnapshots to DocumentSnapshots.
    EventListener<ViewSnapshot> viewListener = (snapshot, error) -> {
        if (error != null) {
            userListener.onEvent(null, error);
            return;
        }
        Assert.hardAssert(snapshot != null, "Got event without value or error set");
        Assert.hardAssert(snapshot.getDocuments().size() <= 1, "Too many documents returned on a document query");
        Document document = snapshot.getDocuments().getDocument(key);
        DocumentSnapshot documentSnapshot;
        if (document != null) {
            boolean hasPendingWrites = snapshot.getMutatedKeys().contains(document.getKey());
            documentSnapshot = DocumentSnapshot.fromDocument(firestore, document, snapshot.isFromCache(), hasPendingWrites);
        } else {
            // We don't raise `hasPendingWrites` for deleted documents.
            documentSnapshot = DocumentSnapshot.fromNoDocument(firestore, key, snapshot.isFromCache());
        }
        userListener.onEvent(documentSnapshot, null);
    };
    // Call the viewListener on the userExecutor.
    AsyncEventListener<ViewSnapshot> asyncListener = new AsyncEventListener<>(userExecutor, viewListener);
    com.google.firebase.firestore.core.Query query = asQuery();
    QueryListener queryListener = firestore.getClient().listen(query, options, asyncListener);
    return ActivityScope.bind(activity, new ListenerRegistrationImpl(firestore.getClient(), queryListener, asyncListener));
}

Example 2 with AsyncEventListener

use of com.google.firebase.firestore.core.AsyncEventListener in project firebase-android-sdk by firebase.

the class Query method addSnapshotListenerInternal.

/**
 * Internal helper method to create add a snapshot listener.
 *
 * <p>Will be Activity scoped if the activity parameter is non-{@code null}.
 *
 * @param executor The executor to use to call the listener.
 * @param options The options to use for this listen.
 * @param activity Optional activity this listener is scoped to.
 * @param userListener The user-supplied event listener that will be called with the snapshots.
 * @return A registration object that can be used to remove the listener.
 */
private ListenerRegistration addSnapshotListenerInternal(Executor executor, ListenOptions options, @Nullable Activity activity, EventListener<QuerySnapshot> userListener) {
    validateHasExplicitOrderByForLimitToLast();
    // Convert from ViewSnapshots to QuerySnapshots.
    EventListener<ViewSnapshot> viewListener = (@Nullable ViewSnapshot snapshot, @Nullable FirebaseFirestoreException error) -> {
        if (error != null) {
            userListener.onEvent(null, error);
            return;
        }
        hardAssert(snapshot != null, "Got event without value or error set");
        QuerySnapshot querySnapshot = new QuerySnapshot(this, snapshot, firestore);
        userListener.onEvent(querySnapshot, null);
    };
    // Call the viewListener on the userExecutor.
    AsyncEventListener<ViewSnapshot> asyncListener = new AsyncEventListener<>(executor, viewListener);
    QueryListener queryListener = firestore.getClient().listen(query, options, asyncListener);
    return ActivityScope.bind(activity, new ListenerRegistrationImpl(firestore.getClient(), queryListener, asyncListener));
}