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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 /** Abstract and private interface for a place to put events. */ | 7 /** Abstract and private interface for a place to put events. */ |
8 abstract class _EventSink<T> { | 8 abstract class _EventSink<T> { |
9 void _add(T data); | 9 void _add(T data); |
10 void _addError(Object error, StackTrace stackTrace); | 10 void _addError(Object error, StackTrace stackTrace); |
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132 _pending.schedule(this); | 132 _pending.schedule(this); |
133 } | 133 } |
134 } | 134 } |
135 | 135 |
136 // StreamSubscription interface. | 136 // StreamSubscription interface. |
137 | 137 |
138 void onData(void handleData(T event)) { | 138 void onData(void handleData(T event)) { |
139 if (handleData == null) handleData = _nullDataHandler; | 139 if (handleData == null) handleData = _nullDataHandler; |
140 // TODO(floitsch): the return type should be 'void', and the type | 140 // TODO(floitsch): the return type should be 'void', and the type |
141 // should be inferred. | 141 // should be inferred. |
142 _onData = _zone.registerUnaryCallback/*<dynamic, T>*/(handleData); | 142 _onData = _zone.registerUnaryCallback<dynamic, T>(handleData); |
143 } | 143 } |
144 | 144 |
145 void onError(Function handleError) { | 145 void onError(Function handleError) { |
146 if (handleError == null) handleError = _nullErrorHandler; | 146 if (handleError == null) handleError = _nullErrorHandler; |
147 // We are not allowed to use 'void' as type argument for the generic type, | 147 // We are not allowed to use 'void' as type argument for the generic type, |
148 // so we use 'dynamic' instead. | 148 // so we use 'dynamic' instead. |
149 _onError = _registerErrorHandler/*<dynamic>*/(handleError, _zone); | 149 _onError = _registerErrorHandler<dynamic>(handleError, _zone); |
150 } | 150 } |
151 | 151 |
152 void onDone(void handleDone()) { | 152 void onDone(void handleDone()) { |
153 if (handleDone == null) handleDone = _nullDoneHandler; | 153 if (handleDone == null) handleDone = _nullDoneHandler; |
154 _onDone = _zone.registerCallback(handleDone); | 154 _onDone = _zone.registerCallback(handleDone); |
155 } | 155 } |
156 | 156 |
157 void pause([Future resumeSignal]) { | 157 void pause([Future resumeSignal]) { |
158 if (_isCanceled) return; | 158 if (_isCanceled) return; |
159 bool wasPaused = _isPaused; | 159 bool wasPaused = _isPaused; |
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186 // The user doesn't want to receive any further events. If there is an | 186 // The user doesn't want to receive any further events. If there is an |
187 // error or done event pending (waiting for the cancel to be done) discard | 187 // error or done event pending (waiting for the cancel to be done) discard |
188 // that event. | 188 // that event. |
189 _state &= ~_STATE_WAIT_FOR_CANCEL; | 189 _state &= ~_STATE_WAIT_FOR_CANCEL; |
190 if (!_isCanceled) { | 190 if (!_isCanceled) { |
191 _cancel(); | 191 _cancel(); |
192 } | 192 } |
193 return _cancelFuture ?? Future._nullFuture; | 193 return _cancelFuture ?? Future._nullFuture; |
194 } | 194 } |
195 | 195 |
196 Future/*<E>*/ asFuture/*<E>*/([var/*=E*/ futureValue]) { | 196 Future<E> asFuture<E>([E futureValue]) { |
197 _Future/*<E>*/ result = new _Future/*<E>*/(); | 197 _Future<E> result = new _Future<E>(); |
198 | 198 |
199 // Overwrite the onDone and onError handlers. | 199 // Overwrite the onDone and onError handlers. |
200 _onDone = () { result._complete(futureValue); }; | 200 _onDone = () { result._complete(futureValue); }; |
201 _onError = (error, stackTrace) { | 201 _onError = (error, stackTrace) { |
202 Future cancelFuture = cancel(); | 202 Future cancelFuture = cancel(); |
203 if (!identical(cancelFuture, Future._nullFuture)) { | 203 if (!identical(cancelFuture, Future._nullFuture)) { |
204 cancelFuture.whenComplete(() { | 204 cancelFuture.whenComplete(() { |
205 result._completeError(error, stackTrace); | 205 result._completeError(error, stackTrace); |
206 }); | 206 }); |
207 } else { | 207 } else { |
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250 } | 250 } |
251 | 251 |
252 // _EventSink interface. | 252 // _EventSink interface. |
253 | 253 |
254 void _add(T data) { | 254 void _add(T data) { |
255 assert(!_isClosed); | 255 assert(!_isClosed); |
256 if (_isCanceled) return; | 256 if (_isCanceled) return; |
257 if (_canFire) { | 257 if (_canFire) { |
258 _sendData(data); | 258 _sendData(data); |
259 } else { | 259 } else { |
260 _addPending(new _DelayedData<dynamic /*=T*/>(data)); | 260 _addPending(new _DelayedData<T>(data)); |
261 } | 261 } |
262 } | 262 } |
263 | 263 |
264 void _addError(Object error, StackTrace stackTrace) { | 264 void _addError(Object error, StackTrace stackTrace) { |
265 if (_isCanceled) return; | 265 if (_isCanceled) return; |
266 if (_canFire) { | 266 if (_canFire) { |
267 _sendError(error, stackTrace); // Reports cancel after sending. | 267 _sendError(error, stackTrace); // Reports cancel after sending. |
268 } else { | 268 } else { |
269 _addPending(new _DelayedError(error, stackTrace)); | 269 _addPending(new _DelayedError(error, stackTrace)); |
270 } | 270 } |
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302 | 302 |
303 /** | 303 /** |
304 * Add a pending event. | 304 * Add a pending event. |
305 * | 305 * |
306 * If the subscription is not paused, this also schedules a firing | 306 * If the subscription is not paused, this also schedules a firing |
307 * of pending events later (if necessary). | 307 * of pending events later (if necessary). |
308 */ | 308 */ |
309 void _addPending(_DelayedEvent event) { | 309 void _addPending(_DelayedEvent event) { |
310 _StreamImplEvents<T> pending = _pending; | 310 _StreamImplEvents<T> pending = _pending; |
311 if (_pending == null) { | 311 if (_pending == null) { |
312 pending = _pending = new _StreamImplEvents<dynamic /*=T*/>(); | 312 pending = _pending = new _StreamImplEvents<T>(); |
313 } | 313 } |
314 pending.add(event); | 314 pending.add(event); |
315 if (!_hasPending) { | 315 if (!_hasPending) { |
316 _state |= _STATE_HAS_PENDING; | 316 _state |= _STATE_HAS_PENDING; |
317 if (!_isPaused) { | 317 if (!_isPaused) { |
318 _pending.schedule(this); | 318 _pending.schedule(this); |
319 } | 319 } |
320 } | 320 } |
321 } | 321 } |
322 | 322 |
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342 void sendError() { | 342 void sendError() { |
343 // If the subscription has been canceled while waiting for the cancel | 343 // If the subscription has been canceled while waiting for the cancel |
344 // future to finish we must not report the error. | 344 // future to finish we must not report the error. |
345 if (_isCanceled && !_waitsForCancel) return; | 345 if (_isCanceled && !_waitsForCancel) return; |
346 _state |= _STATE_IN_CALLBACK; | 346 _state |= _STATE_IN_CALLBACK; |
347 if (_onError is ZoneBinaryCallback<dynamic, Object, StackTrace>) { | 347 if (_onError is ZoneBinaryCallback<dynamic, Object, StackTrace>) { |
348 ZoneBinaryCallback<dynamic, Object, StackTrace> errorCallback = _onError | 348 ZoneBinaryCallback<dynamic, Object, StackTrace> errorCallback = _onError |
349 as Object /*=ZoneBinaryCallback<dynamic, Object, StackTrace>*/; | 349 as Object /*=ZoneBinaryCallback<dynamic, Object, StackTrace>*/; |
350 _zone.runBinaryGuarded(errorCallback, error, stackTrace); | 350 _zone.runBinaryGuarded(errorCallback, error, stackTrace); |
351 } else { | 351 } else { |
352 _zone.runUnaryGuarded/*<dynamic, dynamic>*/( | 352 _zone.runUnaryGuarded<dynamic, dynamic>( |
353 _onError as Object /*=ZoneUnaryCallback<dynamic, dynamic>*/, error); | 353 _onError as Object /*=ZoneUnaryCallback<dynamic, dynamic>*/, error); |
354 } | 354 } |
355 _state &= ~_STATE_IN_CALLBACK; | 355 _state &= ~_STATE_IN_CALLBACK; |
356 } | 356 } |
357 | 357 |
358 if (_cancelOnError) { | 358 if (_cancelOnError) { |
359 _state |= _STATE_WAIT_FOR_CANCEL; | 359 _state |= _STATE_WAIT_FOR_CANCEL; |
360 _cancel(); | 360 _cancel(); |
361 if (_cancelFuture is Future && | 361 if (_cancelFuture is Future && |
362 !identical(_cancelFuture, Future._nullFuture)) { | 362 !identical(_cancelFuture, Future._nullFuture)) { |
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753 if (isPaused) { | 753 if (isPaused) { |
754 _state -= _PAUSED; | 754 _state -= _PAUSED; |
755 if (!isPaused && !_isSent) { | 755 if (!isPaused && !_isSent) { |
756 _schedule(); | 756 _schedule(); |
757 } | 757 } |
758 } | 758 } |
759 } | 759 } |
760 | 760 |
761 Future cancel() => Future._nullFuture; | 761 Future cancel() => Future._nullFuture; |
762 | 762 |
763 Future/*<E>*/ asFuture/*<E>*/([var/*=E*/ futureValue]) { | 763 Future<E> asFuture<E>([E futureValue]) { |
764 _Future/*<E>*/ result = new _Future/*<E>*/(); | 764 _Future<E> result = new _Future<E>(); |
765 _onDone = () { result._completeWithValue(null); }; | 765 _onDone = () { result._completeWithValue(null); }; |
766 return result; | 766 return result; |
767 } | 767 } |
768 | 768 |
769 void _sendDone() { | 769 void _sendDone() { |
770 _state &= ~_SCHEDULED; | 770 _state &= ~_SCHEDULED; |
771 if (isPaused) return; | 771 if (isPaused) return; |
772 _state |= _DONE_SENT; | 772 _state |= _DONE_SENT; |
773 if (_onDone != null) _zone.runGuarded(_onDone); | 773 if (_onDone != null) _zone.runGuarded(_onDone); |
774 } | 774 } |
775 } | 775 } |
776 | 776 |
777 class _AsBroadcastStream<T> extends Stream<T> { | 777 class _AsBroadcastStream<T> extends Stream<T> { |
778 final Stream<T> _source; | 778 final Stream<T> _source; |
779 final _BroadcastCallback<T> _onListenHandler; | 779 final _BroadcastCallback<T> _onListenHandler; |
780 final _BroadcastCallback<T> _onCancelHandler; | 780 final _BroadcastCallback<T> _onCancelHandler; |
781 final Zone _zone; | 781 final Zone _zone; |
782 | 782 |
783 _AsBroadcastStreamController<T> _controller; | 783 _AsBroadcastStreamController<T> _controller; |
784 StreamSubscription<T> _subscription; | 784 StreamSubscription<T> _subscription; |
785 | 785 |
786 _AsBroadcastStream(this._source, | 786 _AsBroadcastStream(this._source, |
787 void onListenHandler(StreamSubscription<T> subscription), | 787 void onListenHandler(StreamSubscription<T> subscription), |
788 void onCancelHandler(StreamSubscription<T> subscription)) | 788 void onCancelHandler(StreamSubscription<T> subscription)) |
789 // TODO(floitsch): the return type should be void and should be | 789 // TODO(floitsch): the return type should be void and should be |
790 // inferred. | 790 // inferred. |
791 : _onListenHandler = Zone.current.registerUnaryCallback | 791 : _onListenHandler = Zone.current.registerUnaryCallback |
792 /*<dynamic, StreamSubscription<T>>*/(onListenHandler), | 792 <dynamic, StreamSubscription<T>>(onListenHandler), |
793 _onCancelHandler = Zone.current.registerUnaryCallback | 793 _onCancelHandler = Zone.current.registerUnaryCallback |
794 /*<dynamic, StreamSubscription<T>>*/(onCancelHandler), | 794 <dynamic, StreamSubscription<T>>(onCancelHandler), |
795 _zone = Zone.current { | 795 _zone = Zone.current { |
796 _controller = new _AsBroadcastStreamController<T>(_onListen, _onCancel); | 796 _controller = new _AsBroadcastStreamController<T>(_onListen, _onCancel); |
797 } | 797 } |
798 | 798 |
799 bool get isBroadcast => true; | 799 bool get isBroadcast => true; |
800 | 800 |
801 StreamSubscription<T> listen(void onData(T data), | 801 StreamSubscription<T> listen(void onData(T data), |
802 { Function onError, | 802 { Function onError, |
803 void onDone(), | 803 void onDone(), |
804 bool cancelOnError}) { | 804 bool cancelOnError}) { |
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896 | 896 |
897 Future cancel() { | 897 Future cancel() { |
898 _stream._cancelSubscription(); | 898 _stream._cancelSubscription(); |
899 return Future._nullFuture; | 899 return Future._nullFuture; |
900 } | 900 } |
901 | 901 |
902 bool get isPaused { | 902 bool get isPaused { |
903 return _stream._isSubscriptionPaused; | 903 return _stream._isSubscriptionPaused; |
904 } | 904 } |
905 | 905 |
906 Future/*<E>*/ asFuture/*<E>*/([var/*=E*/ futureValue]) { | 906 Future<E> asFuture<E>([E futureValue]) { |
907 throw new UnsupportedError( | 907 throw new UnsupportedError( |
908 "Cannot change handlers of asBroadcastStream source subscription."); | 908 "Cannot change handlers of asBroadcastStream source subscription."); |
909 } | 909 } |
910 } | 910 } |
911 | 911 |
912 | 912 |
913 /** | 913 /** |
914 * Simple implementation of [StreamIterator]. | 914 * Simple implementation of [StreamIterator]. |
915 * | 915 * |
916 * Pauses the stream between calls to [moveNext]. | 916 * Pauses the stream between calls to [moveNext]. |
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1052 class _EmptyStream<T> extends Stream<T> { | 1052 class _EmptyStream<T> extends Stream<T> { |
1053 const _EmptyStream() : super._internal(); | 1053 const _EmptyStream() : super._internal(); |
1054 bool get isBroadcast => true; | 1054 bool get isBroadcast => true; |
1055 StreamSubscription<T> listen(void onData(T data), | 1055 StreamSubscription<T> listen(void onData(T data), |
1056 {Function onError, | 1056 {Function onError, |
1057 void onDone(), | 1057 void onDone(), |
1058 bool cancelOnError}) { | 1058 bool cancelOnError}) { |
1059 return new _DoneStreamSubscription<T>(onDone); | 1059 return new _DoneStreamSubscription<T>(onDone); |
1060 } | 1060 } |
1061 } | 1061 } |
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