publishValue method Null safety
Convert the current Stream into a
that can be listened to multiple times. It will not begin emitting items
from the original Stream until the
connect method is invoked.
This is useful for converting a single-subscription stream into a broadcast Stream that replays the latest emitted value to any new listener. It also provides access to the latest value synchronously.
final source = Stream.fromIterable([1, 2, 3]); final connectable = source.publishValue(); // Does not print anything at first connectable.listen(print); // Start listening to the source Stream. Will cause the previous // line to start printing 1, 2, 3 final subscription = connectable.connect(); // Late subscribers will receive the last emitted value connectable.listen(print); // Prints 3 // Can access the latest emitted value synchronously. Prints 3 print(connectable.value); // Stop emitting items from the source stream and close the underlying // BehaviorSubject subscription.cancel();
ValueConnectableStream<T> publishValue() => ValueConnectableStream<T>(this, sync: true);