| // 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 onListen is provided, it is called with a subscription-like object that |
| /// represents the underlying subscription to this stream. It is possible to |
| /// pause, resume or cancel the subscription during the call to onListen. It |
| /// is not possible to change the event handlers, including using |
| /// StreamSubscription.asFuture. |
| /// |
| /// @description Checks that onListen callback is called when broadcast stream |
| /// gets its subscribers and if subscription to underlying stream is cancelled |
| /// in this callback, no onData events will be fired. |
| /// @author ilya |
| |
| library asBroadcastStream_A03_t01; |
| import "dart:async"; |
| import "../../../Utils/expect.dart"; |
| |
| void test(CreateStreamFunction create) { |
| Stream<int> s = create([1,2,3,4,5]); |
| |
| asyncStart(); |
| |
| Stream<int> b = s.asBroadcastStream(onListen: (StreamSubscription ss) { |
| ss.cancel(); |
| asyncEnd(); |
| }); |
| |
| b.listen((_) { |
| Expect.fail('unexpected onData event'); |
| }); |
| |
| b.listen((_) { |
| Expect.fail('unexpected onData event'); |
| }); |
| } |
| |