| /* |
| * Copyright (c) 2011, the Dart project authors. Please see the AUTHORS file |
| * for details. All rights reserved. Use of this source code is governed by a |
| * BSD-style license that can be found in the LICENSE file. |
| */ |
| /** |
| * @assertion Stream<T> asBroadcastStream ({void onListen(StreamSubscription<T> |
| * subscription), void onCancel(StreamSubscription<T> subscription)}) |
| * If onCancel is provided, it is called in a similar way to onListen when |
| * the returned stream stops having listener. If it later gets a new listener, |
| * the onListen function is called again. |
| * @description Checks that onCancel callback is called when broadcast stream |
| * stops having listeners because they all cancel subscription. |
| * @author ilya |
| */ |
| |
| import "dart:async"; |
| import "../../../Utils/async_utils.dart"; |
| |
| main() { |
| var s = new Stream.fromIterable([1,2,3]); |
| |
| asyncStart(); |
| var b = s.asBroadcastStream(onCancel: (subs) { |
| // cancel subscription to underlying stream |
| subs.cancel(); |
| asyncEnd(); |
| }); |
| |
| newSubscription(stream) { |
| // get one element and cancel |
| var subs = stream.listen(null); |
| subs.onData((_) {subs.cancel();}); |
| } |
| |
| newSubscription(b); |
| newSubscription(b); |
| newSubscription(b); |
| } |
| |