| // 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 "../../../Utils/expect.dart"; |
| import "IsolateStream.dart" as IsolateStream; |
| |
| main() { |
| var s = IsolateStream.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); |
| } |