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Side by Side Diff: sdk/lib/async/stream.dart

Issue 16125005: Make new StreamController be async by default. (Closed) Base URL: https://dart.googlecode.com/svn/branches/bleeding_edge/dart
Patch Set: Created 7 years, 6 months ago
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1 // Copyright (c) 2013, the Dart project authors. Please see the AUTHORS file 1 // Copyright (c) 2013, 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 part of dart.async; 5 part of dart.async;
6 6
7 // ------------------------------------------------------------------- 7 // -------------------------------------------------------------------
8 // Core Stream types 8 // Core Stream types
9 // ------------------------------------------------------------------- 9 // -------------------------------------------------------------------
10 10
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55 abstract class Stream<T> { 55 abstract class Stream<T> {
56 Stream(); 56 Stream();
57 57
58 /** 58 /**
59 * Creates a new single-subscription stream from the future. 59 * Creates a new single-subscription stream from the future.
60 * 60 *
61 * When the future completes, the stream will fire one event, either 61 * When the future completes, the stream will fire one event, either
62 * data or error, and then close with a done-event. 62 * data or error, and then close with a done-event.
63 */ 63 */
64 factory Stream.fromFuture(Future<T> future) { 64 factory Stream.fromFuture(Future<T> future) {
65 StreamController<T> controller = new StreamController<T>(); 65 StreamController<T> controller = new StreamController<T>(sync: true);
66 future.then((value) { 66 future.then((value) {
67 controller.add(value); 67 controller.add(value);
68 controller.close(); 68 controller.close();
69 }, 69 },
70 onError: (error) { 70 onError: (error) {
71 controller.addError(error); 71 controller.addError(error);
72 controller.close(); 72 controller.close();
73 }); 73 });
74 return controller.stream; 74 return controller.stream;
75 } 75 }
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107 controller.add(data); 107 controller.add(data);
108 } 108 }
109 109
110 void startPeriodicTimer() { 110 void startPeriodicTimer() {
111 assert(timer == null); 111 assert(timer == null);
112 timer = new Timer.periodic(period, (Timer timer) { 112 timer = new Timer.periodic(period, (Timer timer) {
113 sendEvent(); 113 sendEvent();
114 }); 114 });
115 } 115 }
116 116
117 controller = new StreamController<T>( 117 controller = new StreamController<T>(sync: true,
118 onListen: () { 118 onListen: () {
119 watch.start(); 119 watch.start();
120 startPeriodicTimer(); 120 startPeriodicTimer();
121 }, 121 },
122 onPause: () { 122 onPause: () {
123 timer.cancel(); 123 timer.cancel();
124 timer = null; 124 timer = null;
125 watch.stop(); 125 watch.stop();
126 }, 126 },
127 onResume: () { 127 onResume: () {
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1241 * 1241 *
1242 * If a [moveNext] call has been made, it will complete with `false` as value, 1242 * If a [moveNext] call has been made, it will complete with `false` as value,
1243 * as will all further calls to [moveNext]. 1243 * as will all further calls to [moveNext].
1244 * 1244 *
1245 * If you need to stop listening for values before the stream iterator is 1245 * If you need to stop listening for values before the stream iterator is
1246 * automatically closed, you must call [cancel] to ensure that the stream 1246 * automatically closed, you must call [cancel] to ensure that the stream
1247 * is properly closed. 1247 * is properly closed.
1248 */ 1248 */
1249 void cancel(); 1249 void cancel();
1250 } 1250 }
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