| // 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. |
| /// |
| /// The returned stream will subscribe to this stream when its first subscriber |
| /// is added, and will stay subscribed until this stream ends, or a callback |
| /// cancels the subscription. |
| /// |
| /// @description Checks that if some subscriptions to broadcast stream cancel, |
| /// other still listen to completion. |
| /// @author ilya |
| |
| library asBroadcastStream_A01_t04; |
| import "dart:async"; |
| import "../../../Utils/expect.dart"; |
| |
| const int subscribersCount = 10; |
| const int dataSize = 1000; |
| |
| void multiListen(Stream<int> s) { |
| |
| for(int i = 0; i < subscribersCount; ++i) { |
| asyncStart(); |
| if (i.isEven) { |
| // listener that quits after half of data |
| var quitter; |
| quitter = s.listen( |
| (int data) { |
| if (data > dataSize / 2) { |
| quitter.cancel(); |
| asyncEnd(); |
| } |
| } |
| ); |
| } else { |
| // listener that works to completion |
| int processed = 0; |
| s.listen( |
| (int data) {++processed;}, |
| onDone: () { |
| Expect.equals(dataSize, processed); |
| asyncEnd(); |
| } |
| ); |
| } |
| } |
| } |
| |
| void test(CreateStreamFunction create) { |
| multiListen( |
| create(new Iterable<int>.generate(dataSize, (i) => i)).asBroadcastStream() |
| ); |
| } |