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| 1 // Copyright (c) 2014, the Dart project authors. Please see the AUTHORS file | 1 // Copyright (c) 2014, 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 cancelable_future; | 5 library cancelable_future; |
| 6 | 6 |
| 7 import 'dart:async'; | 7 import 'dart:async'; |
| 8 | 8 |
| 9 /** | 9 /** |
| 10 * Type of callback called when the future returned by a CancelableCompleter | 10 * Type of callback called when the future returned by a CancelableCompleter |
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| 221 * never succeed--futures that have already completed retain their final | 221 * never succeed--futures that have already completed retain their final |
| 222 * state forever. | 222 * state forever. |
| 223 */ | 223 */ |
| 224 void cancel(); | 224 void cancel(); |
| 225 } | 225 } |
| 226 | 226 |
| 227 /** | 227 /** |
| 228 * Error which is used to complete any [CancelableFuture] which has been | 228 * Error which is used to complete any [CancelableFuture] which has been |
| 229 * successfully canceled by calling its 'cancel' method. | 229 * successfully canceled by calling its 'cancel' method. |
| 230 */ | 230 */ |
| 231 class FutureCanceledError { | 231 class FutureCanceledError {} |
| 232 } | |
| 233 | 232 |
| 234 class _CancelableCompleterFuture<T> implements CancelableFuture<T> { | 233 class _CancelableCompleterFuture<T> implements CancelableFuture<T> { |
| 235 final CancelableCompleter<T> _completer; | 234 final CancelableCompleter<T> _completer; |
| 236 | 235 |
| 237 _CancelableCompleterFuture(this._completer); | 236 _CancelableCompleterFuture(this._completer); |
| 238 | 237 |
| 239 @override | 238 @override |
| 240 Stream<T> asStream() { | 239 Stream<T> asStream() { |
| 241 // TODO(paulberry): Implement this in such a way that | 240 // TODO(paulberry): Implement this in such a way that |
| 242 // StreamSubscription.cancel() cancels the future. | 241 // StreamSubscription.cancel() cancels the future. |
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| 253 _completer._outerCompleter.future.catchError(onError, test: test); | 252 _completer._outerCompleter.future.catchError(onError, test: test); |
| 254 | 253 |
| 255 @override | 254 @override |
| 256 Future then(onValue(T value), {Function onError}) => | 255 Future then(onValue(T value), {Function onError}) => |
| 257 _completer._outerCompleter.future.then(onValue, onError: onError); | 256 _completer._outerCompleter.future.then(onValue, onError: onError); |
| 258 | 257 |
| 259 @override | 258 @override |
| 260 Future timeout(Duration timeLimit, {onTimeout()}) { | 259 Future timeout(Duration timeLimit, {onTimeout()}) { |
| 261 // TODO(paulberry): Implement this in such a way that a timeout cancels | 260 // TODO(paulberry): Implement this in such a way that a timeout cancels |
| 262 // the future. | 261 // the future. |
| 263 return _completer._outerCompleter.future.timeout( | 262 return _completer._outerCompleter.future.timeout(timeLimit, |
| 264 timeLimit, | |
| 265 onTimeout: onTimeout); | 263 onTimeout: onTimeout); |
| 266 } | 264 } |
| 267 | 265 |
| 268 @override | 266 @override |
| 269 Future<T> whenComplete(action()) => | 267 Future<T> whenComplete(action()) => |
| 270 _completer._outerCompleter.future.whenComplete(action); | 268 _completer._outerCompleter.future.whenComplete(action); |
| 271 } | 269 } |
| 272 | 270 |
| 273 /** | 271 /** |
| 274 * A CancelableFuture that wraps an ordinary Future. Attempting to cancel a | 272 * A CancelableFuture that wraps an ordinary Future. Attempting to cancel a |
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| 293 Future then(onValue(value), {Function onError}) => | 291 Future then(onValue(value), {Function onError}) => |
| 294 _future.then(onValue, onError: onError); | 292 _future.then(onValue, onError: onError); |
| 295 | 293 |
| 296 @override | 294 @override |
| 297 Future timeout(Duration timeLimit, {onTimeout()}) => | 295 Future timeout(Duration timeLimit, {onTimeout()}) => |
| 298 _future.timeout(timeLimit, onTimeout: onTimeout); | 296 _future.timeout(timeLimit, onTimeout: onTimeout); |
| 299 | 297 |
| 300 @override | 298 @override |
| 301 Future whenComplete(action()) => _future.whenComplete(action); | 299 Future whenComplete(action()) => _future.whenComplete(action); |
| 302 } | 300 } |
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