| // 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)}) |
| /// Returns a multi-subscription stream that produces the same events as this. |
| /// |
| /// 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 the underlying stream ends. |
| /// @author ilya |
| |
| library asBroadcastStream_A04_t01; |
| import "dart:async"; |
| import "../../../Utils/expect.dart"; |
| |
| void test(CreateStreamFunction create) { |
| Stream<int> s = create([1, 2, 3]); |
| |
| asyncStart(); |
| Stream<int> b = s.asBroadcastStream( |
| onCancel: (StreamSubscription<int> subs) { |
| asyncEnd(); |
| } |
| ); |
| b.listen((_) {}); |
| b.listen((_) {}); |
| b.listen((_) {}); |
| } |