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| 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 | |
| 3 // BSD-style license that can be found in the LICENSE file. | |
| 4 | |
| 5 part of dart.async; | |
| 6 | |
| 7 class _BroadcastStream<T> extends _ControllerStream<T> { | |
| 8 _BroadcastStream(_StreamControllerLifecycle controller) : super(controller); | |
| 9 | |
| 10 bool get isBroadcast => true; | |
| 11 } | |
| 12 | |
| 13 abstract class _BroadcastSubscriptionLink { | |
| 14 _BroadcastSubscriptionLink _next; | |
| 15 _BroadcastSubscriptionLink _previous; | |
| 16 } | |
| 17 | |
| 18 class _BroadcastSubscription<T> extends _ControllerSubscription<T> | |
| 19 implements _BroadcastSubscriptionLink { | |
| 20 static const int _STATE_EVENT_ID = 1; | |
| 21 static const int _STATE_FIRING = 2; | |
| 22 static const int _STATE_REMOVE_AFTER_FIRING = 4; | |
| 23 // TODO(lrn): Use the _state field on _ControllerSubscription to | |
| 24 // also store this state. Requires that the subscription implementation | |
| 25 // does not assume that it's use of the state integer is the only use. | |
| 26 int _eventState; | |
| 27 | |
| 28 _BroadcastSubscriptionLink _next; | |
| 29 _BroadcastSubscriptionLink _previous; | |
| 30 | |
| 31 _BroadcastSubscription(_StreamControllerLifecycle controller, | |
| 32 void onData(T data), | |
| 33 Function onError, | |
| 34 void onDone(), | |
| 35 bool cancelOnError) | |
| 36 : super(controller, onData, onError, onDone, cancelOnError) { | |
| 37 _next = _previous = this; | |
| 38 } | |
| 39 | |
| 40 _BroadcastStreamController<T> get _controller => super._controller; | |
| 41 | |
| 42 bool _expectsEvent(int eventId) => | |
| 43 (_eventState & _STATE_EVENT_ID) == eventId; | |
| 44 | |
| 45 void _toggleEventId() { | |
| 46 _eventState ^= _STATE_EVENT_ID; | |
| 47 } | |
| 48 | |
| 49 bool get _isFiring => (_eventState & _STATE_FIRING) != 0; | |
| 50 | |
| 51 void _setRemoveAfterFiring() { | |
| 52 assert(_isFiring); | |
| 53 _eventState |= _STATE_REMOVE_AFTER_FIRING; | |
| 54 } | |
| 55 | |
| 56 bool get _removeAfterFiring => | |
| 57 (_eventState & _STATE_REMOVE_AFTER_FIRING) != 0; | |
| 58 | |
| 59 // The controller._recordPause doesn't do anything for a broadcast controller, | |
| 60 // so we don't bother calling it. | |
| 61 void _onPause() { } | |
| 62 | |
| 63 // The controller._recordResume doesn't do anything for a broadcast | |
| 64 // controller, so we don't bother calling it. | |
| 65 void _onResume() { } | |
| 66 | |
| 67 // _onCancel is inherited. | |
| 68 } | |
| 69 | |
| 70 | |
| 71 abstract class _BroadcastStreamController<T> | |
| 72 implements StreamController<T>, | |
| 73 _StreamControllerLifecycle<T>, | |
| 74 _BroadcastSubscriptionLink, | |
| 75 _EventSink<T>, | |
| 76 _EventDispatch<T> { | |
| 77 static const int _STATE_INITIAL = 0; | |
| 78 static const int _STATE_EVENT_ID = 1; | |
| 79 static const int _STATE_FIRING = 2; | |
| 80 static const int _STATE_CLOSED = 4; | |
| 81 static const int _STATE_ADDSTREAM = 8; | |
| 82 | |
| 83 final _NotificationHandler _onListen; | |
| 84 final _NotificationHandler _onCancel; | |
| 85 | |
| 86 // State of the controller. | |
| 87 int _state; | |
| 88 | |
| 89 // Double-linked list of active listeners. | |
| 90 _BroadcastSubscriptionLink _next; | |
| 91 _BroadcastSubscriptionLink _previous; | |
| 92 | |
| 93 // Extra state used during an [addStream] call. | |
| 94 _AddStreamState<T> _addStreamState; | |
| 95 | |
| 96 /** | |
| 97 * Future returned by [close] and [done]. | |
| 98 * | |
| 99 * The future is completed whenever the done event has been sent to all | |
| 100 * relevant listeners. | |
| 101 * The relevant listeners are the ones that were listening when [close] was | |
| 102 * called. When all of these have been canceled (sending the done event makes | |
| 103 * them cancel, but they can also be canceled before sending the event), | |
| 104 * this future completes. | |
| 105 * | |
| 106 * Any attempt to listen after calling [close] will throw, so there won't | |
| 107 * be any further listeners. | |
| 108 */ | |
| 109 _Future _doneFuture; | |
| 110 | |
| 111 _BroadcastStreamController(this._onListen, this._onCancel) | |
| 112 : _state = _STATE_INITIAL { | |
| 113 _next = _previous = this; | |
| 114 } | |
| 115 | |
| 116 // StreamController interface. | |
| 117 | |
| 118 Stream<T> get stream => new _BroadcastStream<T>(this); | |
| 119 | |
| 120 StreamSink<T> get sink => new _StreamSinkWrapper<T>(this); | |
| 121 | |
| 122 bool get isClosed => (_state & _STATE_CLOSED) != 0; | |
| 123 | |
| 124 /** | |
| 125 * A broadcast controller is never paused. | |
| 126 * | |
| 127 * Each receiving stream may be paused individually, and they handle their | |
| 128 * own buffering. | |
| 129 */ | |
| 130 bool get isPaused => false; | |
| 131 | |
| 132 /** Whether there are currently one or more subscribers. */ | |
| 133 bool get hasListener => !_isEmpty; | |
| 134 | |
| 135 /** | |
| 136 * Test whether the stream has exactly one listener. | |
| 137 * | |
| 138 * Assumes that the stream has a listener (not [_isEmpty]). | |
| 139 */ | |
| 140 bool get _hasOneListener { | |
| 141 assert(!_isEmpty); | |
| 142 return identical(_next._next, this); | |
| 143 } | |
| 144 | |
| 145 /** Whether an event is being fired (sent to some, but not all, listeners). */ | |
| 146 bool get _isFiring => (_state & _STATE_FIRING) != 0; | |
| 147 | |
| 148 bool get _isAddingStream => (_state & _STATE_ADDSTREAM) != 0; | |
| 149 | |
| 150 bool get _mayAddEvent => (_state < _STATE_CLOSED); | |
| 151 | |
| 152 _Future _ensureDoneFuture() { | |
| 153 if (_doneFuture != null) return _doneFuture; | |
| 154 return _doneFuture = new _Future(); | |
| 155 } | |
| 156 | |
| 157 // Linked list helpers | |
| 158 | |
| 159 bool get _isEmpty => identical(_next, this); | |
| 160 | |
| 161 /** Adds subscription to linked list of active listeners. */ | |
| 162 void _addListener(_BroadcastSubscription<T> subscription) { | |
| 163 assert(identical(subscription._next, subscription)); | |
| 164 // Insert in linked list just before `this`. | |
| 165 subscription._previous = _previous; | |
| 166 subscription._next = this; | |
| 167 this._previous._next = subscription; | |
| 168 this._previous = subscription; | |
| 169 subscription._eventState = (_state & _STATE_EVENT_ID); | |
| 170 } | |
| 171 | |
| 172 void _removeListener(_BroadcastSubscription<T> subscription) { | |
| 173 assert(identical(subscription._controller, this)); | |
| 174 assert(!identical(subscription._next, subscription)); | |
| 175 _BroadcastSubscriptionLink previous = subscription._previous; | |
| 176 _BroadcastSubscriptionLink next = subscription._next; | |
| 177 previous._next = next; | |
| 178 next._previous = previous; | |
| 179 subscription._next = subscription._previous = subscription; | |
| 180 } | |
| 181 | |
| 182 // _StreamControllerLifecycle interface. | |
| 183 | |
| 184 StreamSubscription<T> _subscribe( | |
| 185 void onData(T data), | |
| 186 Function onError, | |
| 187 void onDone(), | |
| 188 bool cancelOnError) { | |
| 189 if (isClosed) { | |
| 190 if (onDone == null) onDone = _nullDoneHandler; | |
| 191 return new _DoneStreamSubscription<T>(onDone); | |
| 192 } | |
| 193 StreamSubscription subscription = | |
| 194 new _BroadcastSubscription<T>(this, onData, onError, onDone, | |
| 195 cancelOnError); | |
| 196 _addListener(subscription); | |
| 197 if (identical(_next, _previous)) { | |
| 198 // Only one listener, so it must be the first listener. | |
| 199 _runGuarded(_onListen); | |
| 200 } | |
| 201 return subscription; | |
| 202 } | |
| 203 | |
| 204 Future _recordCancel(StreamSubscription<T> subscription) { | |
| 205 // If already removed by the stream, don't remove it again. | |
| 206 if (identical(subscription._next, subscription)) return null; | |
| 207 assert(!identical(subscription._next, subscription)); | |
| 208 if (subscription._isFiring) { | |
| 209 subscription._setRemoveAfterFiring(); | |
| 210 } else { | |
| 211 assert(!identical(subscription._next, subscription)); | |
| 212 _removeListener(subscription); | |
| 213 // If we are currently firing an event, the empty-check is performed at | |
| 214 // the end of the listener loop instead of here. | |
| 215 if (!_isFiring && _isEmpty) { | |
| 216 _callOnCancel(); | |
| 217 } | |
| 218 } | |
| 219 return null; | |
| 220 } | |
| 221 | |
| 222 void _recordPause(StreamSubscription<T> subscription) {} | |
| 223 void _recordResume(StreamSubscription<T> subscription) {} | |
| 224 | |
| 225 // EventSink interface. | |
| 226 | |
| 227 Error _addEventError() { | |
| 228 if (isClosed) { | |
| 229 return new StateError("Cannot add new events after calling close"); | |
| 230 } | |
| 231 assert(_isAddingStream); | |
| 232 return new StateError("Cannot add new events while doing an addStream"); | |
| 233 } | |
| 234 | |
| 235 void add(T data) { | |
| 236 if (!_mayAddEvent) throw _addEventError(); | |
| 237 _sendData(data); | |
| 238 } | |
| 239 | |
| 240 void addError(Object error, [StackTrace stackTrace]) { | |
| 241 error = _nonNullError(error); | |
| 242 if (!_mayAddEvent) throw _addEventError(); | |
| 243 AsyncError replacement = Zone.current.errorCallback(error, stackTrace); | |
| 244 if (replacement != null) { | |
| 245 error = _nonNullError(replacement.error); | |
| 246 stackTrace = replacement.stackTrace; | |
| 247 } | |
| 248 _sendError(error, stackTrace); | |
| 249 } | |
| 250 | |
| 251 Future close() { | |
| 252 if (isClosed) { | |
| 253 assert(_doneFuture != null); | |
| 254 return _doneFuture; | |
| 255 } | |
| 256 if (!_mayAddEvent) throw _addEventError(); | |
| 257 _state |= _STATE_CLOSED; | |
| 258 Future doneFuture = _ensureDoneFuture(); | |
| 259 _sendDone(); | |
| 260 return doneFuture; | |
| 261 } | |
| 262 | |
| 263 Future get done => _ensureDoneFuture(); | |
| 264 | |
| 265 Future addStream(Stream<T> stream, {bool cancelOnError: true}) { | |
| 266 if (!_mayAddEvent) throw _addEventError(); | |
| 267 _state |= _STATE_ADDSTREAM; | |
| 268 _addStreamState = new _AddStreamState(this, stream, cancelOnError); | |
| 269 return _addStreamState.addStreamFuture; | |
| 270 } | |
| 271 | |
| 272 // _EventSink interface, called from AddStreamState. | |
| 273 void _add(T data) { | |
| 274 _sendData(data); | |
| 275 } | |
| 276 | |
| 277 void _addError(Object error, StackTrace stackTrace) { | |
| 278 _sendError(error, stackTrace); | |
| 279 } | |
| 280 | |
| 281 void _close() { | |
| 282 assert(_isAddingStream); | |
| 283 _AddStreamState addState = _addStreamState; | |
| 284 _addStreamState = null; | |
| 285 _state &= ~_STATE_ADDSTREAM; | |
| 286 addState.complete(); | |
| 287 } | |
| 288 | |
| 289 // Event handling. | |
| 290 void _forEachListener( | |
| 291 void action(_BufferingStreamSubscription<T> subscription)) { | |
| 292 if (_isFiring) { | |
| 293 throw new StateError( | |
| 294 "Cannot fire new event. Controller is already firing an event"); | |
| 295 } | |
| 296 if (_isEmpty) return; | |
| 297 | |
| 298 // Get event id of this event. | |
| 299 int id = (_state & _STATE_EVENT_ID); | |
| 300 // Start firing (set the _STATE_FIRING bit). We don't do [_onCancel] | |
| 301 // callbacks while firing, and we prevent reentrancy of this function. | |
| 302 // | |
| 303 // Set [_state]'s event id to the next event's id. | |
| 304 // Any listeners added while firing this event will expect the next event, | |
| 305 // not this one, and won't get notified. | |
| 306 _state ^= _STATE_EVENT_ID | _STATE_FIRING; | |
| 307 _BroadcastSubscriptionLink link = _next; | |
| 308 while (!identical(link, this)) { | |
| 309 _BroadcastSubscription<T> subscription = link; | |
| 310 if (subscription._expectsEvent(id)) { | |
| 311 subscription._eventState |= _BroadcastSubscription._STATE_FIRING; | |
| 312 action(subscription); | |
| 313 subscription._toggleEventId(); | |
| 314 link = subscription._next; | |
| 315 if (subscription._removeAfterFiring) { | |
| 316 _removeListener(subscription); | |
| 317 } | |
| 318 subscription._eventState &= ~_BroadcastSubscription._STATE_FIRING; | |
| 319 } else { | |
| 320 link = subscription._next; | |
| 321 } | |
| 322 } | |
| 323 _state &= ~_STATE_FIRING; | |
| 324 | |
| 325 if (_isEmpty) { | |
| 326 _callOnCancel(); | |
| 327 } | |
| 328 } | |
| 329 | |
| 330 void _callOnCancel() { | |
| 331 assert(_isEmpty); | |
| 332 if (isClosed && _doneFuture._mayComplete) { | |
| 333 // When closed, _doneFuture is not null. | |
| 334 _doneFuture._asyncComplete(null); | |
| 335 } | |
| 336 _runGuarded(_onCancel); | |
| 337 } | |
| 338 } | |
| 339 | |
| 340 class _SyncBroadcastStreamController<T> extends _BroadcastStreamController<T> { | |
| 341 _SyncBroadcastStreamController(void onListen(), void onCancel()) | |
| 342 : super(onListen, onCancel); | |
| 343 | |
| 344 // EventDispatch interface. | |
| 345 | |
| 346 void _sendData(T data) { | |
| 347 if (_isEmpty) return; | |
| 348 if (_hasOneListener) { | |
| 349 _state |= _BroadcastStreamController._STATE_FIRING; | |
| 350 _BroadcastSubscription subscription = _next; | |
| 351 subscription._add(data); | |
| 352 _state &= ~_BroadcastStreamController._STATE_FIRING; | |
| 353 if (_isEmpty) { | |
| 354 _callOnCancel(); | |
| 355 } | |
| 356 return; | |
| 357 } | |
| 358 _forEachListener((_BufferingStreamSubscription<T> subscription) { | |
| 359 subscription._add(data); | |
| 360 }); | |
| 361 } | |
| 362 | |
| 363 void _sendError(Object error, StackTrace stackTrace) { | |
| 364 if (_isEmpty) return; | |
| 365 _forEachListener((_BufferingStreamSubscription<T> subscription) { | |
| 366 subscription._addError(error, stackTrace); | |
| 367 }); | |
| 368 } | |
| 369 | |
| 370 void _sendDone() { | |
| 371 if (!_isEmpty) { | |
| 372 _forEachListener((_BroadcastSubscription<T> subscription) { | |
| 373 subscription._close(); | |
| 374 }); | |
| 375 } else { | |
| 376 assert(_doneFuture != null); | |
| 377 assert(_doneFuture._mayComplete); | |
| 378 _doneFuture._asyncComplete(null); | |
| 379 } | |
| 380 } | |
| 381 } | |
| 382 | |
| 383 class _AsyncBroadcastStreamController<T> extends _BroadcastStreamController<T> { | |
| 384 _AsyncBroadcastStreamController(void onListen(), void onCancel()) | |
| 385 : super(onListen, onCancel); | |
| 386 | |
| 387 // EventDispatch interface. | |
| 388 | |
| 389 void _sendData(T data) { | |
| 390 for (_BroadcastSubscriptionLink link = _next; | |
| 391 !identical(link, this); | |
| 392 link = link._next) { | |
| 393 _BroadcastSubscription<T> subscription = link; | |
| 394 subscription._addPending(new _DelayedData(data)); | |
| 395 } | |
| 396 } | |
| 397 | |
| 398 void _sendError(Object error, StackTrace stackTrace) { | |
| 399 for (_BroadcastSubscriptionLink link = _next; | |
| 400 !identical(link, this); | |
| 401 link = link._next) { | |
| 402 _BroadcastSubscription<T> subscription = link; | |
| 403 subscription._addPending(new _DelayedError(error, stackTrace)); | |
| 404 } | |
| 405 } | |
| 406 | |
| 407 void _sendDone() { | |
| 408 if (!_isEmpty) { | |
| 409 for (_BroadcastSubscriptionLink link = _next; | |
| 410 !identical(link, this); | |
| 411 link = link._next) { | |
| 412 _BroadcastSubscription<T> subscription = link; | |
| 413 subscription._addPending(const _DelayedDone()); | |
| 414 } | |
| 415 } else { | |
| 416 assert(_doneFuture != null); | |
| 417 assert(_doneFuture._mayComplete); | |
| 418 _doneFuture._asyncComplete(null); | |
| 419 } | |
| 420 } | |
| 421 } | |
| 422 | |
| 423 /** | |
| 424 * Stream controller that is used by [Stream.asBroadcastStream]. | |
| 425 * | |
| 426 * This stream controller allows incoming events while it is firing | |
| 427 * other events. This is handled by delaying the events until the | |
| 428 * current event is done firing, and then fire the pending events. | |
| 429 * | |
| 430 * This class extends [_SyncBroadcastStreamController]. Events of | |
| 431 * an "asBroadcastStream" stream are always initiated by events | |
| 432 * on another stream, and it is fine to forward them synchronously. | |
| 433 */ | |
| 434 class _AsBroadcastStreamController<T> | |
| 435 extends _SyncBroadcastStreamController<T> | |
| 436 implements _EventDispatch<T> { | |
| 437 _StreamImplEvents _pending; | |
| 438 | |
| 439 _AsBroadcastStreamController(void onListen(), void onCancel()) | |
| 440 : super(onListen, onCancel); | |
| 441 | |
| 442 bool get _hasPending => _pending != null && ! _pending.isEmpty; | |
| 443 | |
| 444 void _addPendingEvent(_DelayedEvent event) { | |
| 445 if (_pending == null) { | |
| 446 _pending = new _StreamImplEvents(); | |
| 447 } | |
| 448 _pending.add(event); | |
| 449 } | |
| 450 | |
| 451 void add(T data) { | |
| 452 if (!isClosed && _isFiring) { | |
| 453 _addPendingEvent(new _DelayedData<T>(data)); | |
| 454 return; | |
| 455 } | |
| 456 super.add(data); | |
| 457 while (_hasPending) { | |
| 458 _pending.handleNext(this); | |
| 459 } | |
| 460 } | |
| 461 | |
| 462 void addError(Object error, [StackTrace stackTrace]) { | |
| 463 if (!isClosed && _isFiring) { | |
| 464 _addPendingEvent(new _DelayedError(error, stackTrace)); | |
| 465 return; | |
| 466 } | |
| 467 if (!_mayAddEvent) throw _addEventError(); | |
| 468 _sendError(error, stackTrace); | |
| 469 while (_hasPending) { | |
| 470 _pending.handleNext(this); | |
| 471 } | |
| 472 } | |
| 473 | |
| 474 Future close() { | |
| 475 if (!isClosed && _isFiring) { | |
| 476 _addPendingEvent(const _DelayedDone()); | |
| 477 _state |= _BroadcastStreamController._STATE_CLOSED; | |
| 478 return super.done; | |
| 479 } | |
| 480 Future result = super.close(); | |
| 481 assert(!_hasPending); | |
| 482 return result; | |
| 483 } | |
| 484 | |
| 485 void _callOnCancel() { | |
| 486 if (_hasPending) { | |
| 487 _pending.clear(); | |
| 488 _pending = null; | |
| 489 } | |
| 490 super._callOnCancel(); | |
| 491 } | |
| 492 } | |
| 493 | |
| 494 // A subscription that never receives any events. | |
| 495 // It can simulate pauses, but otherwise does nothing. | |
| 496 class _DoneSubscription<T> implements StreamSubscription<T> { | |
| 497 int _pauseCount = 0; | |
| 498 void onData(void handleData(T data)) {} | |
| 499 void onError(Function handleError) {} | |
| 500 void onDone(void handleDone()) {} | |
| 501 void pause([Future resumeSignal]) { | |
| 502 if (resumeSignal != null) resumeSignal.then(_resume); | |
| 503 _pauseCount++; | |
| 504 } | |
| 505 void resume() { _resume(null); } | |
| 506 void _resume(_) { | |
| 507 if (_pauseCount > 0) _pauseCount--; | |
| 508 } | |
| 509 Future cancel() { return new _Future.immediate(null); } | |
| 510 bool get isPaused => _pauseCount > 0; | |
| 511 Future asFuture([Object value]) => new _Future(); | |
| 512 } | |
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Chromium Code Reviews
Issue 1162723007:
remove generated_sdk from checked in code (Closed)
Base URL: git@github.com:dart-lang/dev_compiler.git@master