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| 1 // Copyright (c) 2012, the Dart project authors. Please see the AUTHORS file | 1 // Copyright (c) 2012, 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 * A [Future] is used to obtain a value sometime in the future. Receivers of a | 8 * A [Future] is used to obtain a value sometime in the future. Receivers of a |
| 9 * [Future] can obtain the value by passing a callback to [then]. For example: | 9 * [Future] can obtain the value by passing a callback to [then]. For example: |
| 10 * | 10 * |
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| 126 * | 126 * |
| 127 * Completer completer = new Completer(); | 127 * Completer completer = new Completer(); |
| 128 * // send future object back to client... | 128 * // send future object back to client... |
| 129 * return completer.future; | 129 * return completer.future; |
| 130 * ... | 130 * ... |
| 131 * | 131 * |
| 132 * // later when value is available, call: | 132 * // later when value is available, call: |
| 133 * completer.complete(value); | 133 * completer.complete(value); |
| 134 * | 134 * |
| 135 * // alternatively, if the service cannot produce the value, it | 135 * // alternatively, if the service cannot produce the value, it |
| 136 * // can provide an exception: | 136 * // can provide an error: |
| 137 * completer.completeException(exception); | 137 * completer.completeError(error); |
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nweiz
2013/01/09 01:24:07
You may want to at least cc Florian on this.
Bob Nystrom
2013/01/09 01:31:35
Good call. It's just a doc change, but I'll add hi
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| 138 * | 138 * |
| 139 */ | 139 */ |
| 140 abstract class Completer<T> { | 140 abstract class Completer<T> { |
| 141 | 141 |
| 142 factory Completer() => new _CompleterImpl<T>(); | 142 factory Completer() => new _CompleterImpl<T>(); |
| 143 | 143 |
| 144 /** The future that will contain the result provided to this completer. */ | 144 /** The future that will contain the result provided to this completer. */ |
| 145 Future get future; | 145 Future get future; |
| 146 | 146 |
| 147 /** | 147 /** |
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| 185 */ | 185 */ |
| 186 static Future forEach(Iterable input, Future f(element)) { | 186 static Future forEach(Iterable input, Future f(element)) { |
| 187 var iterator = input.iterator; | 187 var iterator = input.iterator; |
| 188 Future nextElement(_) { | 188 Future nextElement(_) { |
| 189 if (!iterator.moveNext()) return new Future.immediate(null); | 189 if (!iterator.moveNext()) return new Future.immediate(null); |
| 190 return f(iterator.current).then(nextElement); | 190 return f(iterator.current).then(nextElement); |
| 191 } | 191 } |
| 192 return nextElement(null); | 192 return nextElement(null); |
| 193 } | 193 } |
| 194 } | 194 } |
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