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Side by Side Diff: lib/src/single_subscription_transformer.dart

Issue 1777453002: Modernize the package's style. (Closed) Base URL: git@github.com:dart-lang/async.git@master
Patch Set: Created 4 years, 9 months ago
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1 // Copyright (c) 2016, the Dart project authors. Please see the AUTHORS file 1 // Copyright (c) 2016, the Dart project authors. Please see the AUTHORS file
2 // for details. All rights reserved. Use of this source code is governed by a 2 // for details. All rights reserved. Use of this source code is governed by a
3 // BSD-style license that can be found in the LICENSE file. 3 // BSD-style license that can be found in the LICENSE file.
4 4
5 library async.single_subscription_transformer;
6
7 import 'dart:async'; 5 import 'dart:async';
8 6
9 /// A transformer that converts a broadcast stream into a single-subscription 7 /// A transformer that converts a broadcast stream into a single-subscription
10 /// stream. 8 /// stream.
11 /// 9 ///
12 /// This buffers the broadcast stream's events, which means that it starts 10 /// This buffers the broadcast stream's events, which means that it starts
13 /// listening to a stream as soon as it's bound. 11 /// listening to a stream as soon as it's bound.
14 class SingleSubscriptionTransformer<S, T> implements StreamTransformer<S, T> { 12 class SingleSubscriptionTransformer<S, T> implements StreamTransformer<S, T> {
15 const SingleSubscriptionTransformer(); 13 const SingleSubscriptionTransformer();
16 14
17 Stream<T> bind(Stream<S> stream) { 15 Stream<T> bind(Stream<S> stream) {
18 var subscription; 16 var subscription;
19 var controller = new StreamController(sync: true, 17 var controller = new StreamController(sync: true,
20 onCancel: () => subscription.cancel()); 18 onCancel: () => subscription.cancel());
21 subscription = stream.listen(controller.add, 19 subscription = stream.listen(controller.add,
22 onError: controller.addError, onDone: controller.close); 20 onError: controller.addError, onDone: controller.close);
23 return controller.stream; 21 return controller.stream;
24 } 22 }
25 } 23 }
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