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1 // Copyright 2012 the V8 project authors. All rights reserved. | 1 // Copyright 2012 the V8 project authors. All rights reserved. |
2 // Redistribution and use in source and binary forms, with or without | 2 // Redistribution and use in source and binary forms, with or without |
3 // modification, are permitted provided that the following conditions are | 3 // modification, are permitted provided that the following conditions are |
4 // met: | 4 // met: |
5 // | 5 // |
6 // * Redistributions of source code must retain the above copyright | 6 // * Redistributions of source code must retain the above copyright |
7 // notice, this list of conditions and the following disclaimer. | 7 // notice, this list of conditions and the following disclaimer. |
8 // * Redistributions in binary form must reproduce the above | 8 // * Redistributions in binary form must reproduce the above |
9 // copyright notice, this list of conditions and the following | 9 // copyright notice, this list of conditions and the following |
10 // disclaimer in the documentation and/or other materials provided | 10 // disclaimer in the documentation and/or other materials provided |
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84 return !IS_UNDEFINED(this.get(key)); | 84 return !IS_UNDEFINED(this.get(key)); |
85 } | 85 } |
86 }; | 86 }; |
87 | 87 |
88 var callbackInfoMap = | 88 var callbackInfoMap = |
89 new ObservationWeakMap(observationState.callbackInfoMap); | 89 new ObservationWeakMap(observationState.callbackInfoMap); |
90 var objectInfoMap = new ObservationWeakMap(observationState.objectInfoMap); | 90 var objectInfoMap = new ObservationWeakMap(observationState.objectInfoMap); |
91 var notifierObjectInfoMap = | 91 var notifierObjectInfoMap = |
92 new ObservationWeakMap(observationState.notifierObjectInfoMap); | 92 new ObservationWeakMap(observationState.notifierObjectInfoMap); |
93 | 93 |
94 function nullProtoObject() { | |
95 return { __proto__: null }; | |
96 } | |
97 | |
94 function TypeMapCreate() { | 98 function TypeMapCreate() { |
95 return { __proto__: null }; | 99 return nullProtoObject(); |
96 } | 100 } |
97 | 101 |
98 function TypeMapAddType(typeMap, type, ignoreDuplicate) { | 102 function TypeMapAddType(typeMap, type, ignoreDuplicate) { |
99 typeMap[type] = ignoreDuplicate ? 1 : (typeMap[type] || 0) + 1; | 103 typeMap[type] = ignoreDuplicate ? 1 : (typeMap[type] || 0) + 1; |
100 } | 104 } |
101 | 105 |
102 function TypeMapRemoveType(typeMap, type) { | 106 function TypeMapRemoveType(typeMap, type) { |
103 typeMap[type]--; | 107 typeMap[type]--; |
104 } | 108 } |
105 | 109 |
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135 'reconfigure', | 139 'reconfigure', |
136 'preventExtensions' | 140 'preventExtensions' |
137 ]); | 141 ]); |
138 | 142 |
139 // An Observer is a registration to observe an object by a callback with | 143 // An Observer is a registration to observe an object by a callback with |
140 // a given set of accept types. If the set of accept types is the default | 144 // a given set of accept types. If the set of accept types is the default |
141 // set for Object.observe, the observer is represented as a direct reference | 145 // set for Object.observe, the observer is represented as a direct reference |
142 // to the callback. An observer never changes its accept types and thus never | 146 // to the callback. An observer never changes its accept types and thus never |
143 // needs to "normalize". | 147 // needs to "normalize". |
144 function ObserverCreate(callback, acceptList) { | 148 function ObserverCreate(callback, acceptList) { |
145 return IS_UNDEFINED(acceptList) ? callback : { | 149 if (IS_UNDEFINED(acceptList)) |
146 __proto__: null, | 150 return callback; |
147 callback: callback, | 151 var observer = nullProtoObject(); |
148 accept: TypeMapCreateFromList(acceptList) | 152 observer.callback = callback; |
149 }; | 153 observer.accept = TypeMapCreateFromList(acceptList); |
154 return observer; | |
150 } | 155 } |
151 | 156 |
152 function ObserverGetCallback(observer) { | 157 function ObserverGetCallback(observer) { |
153 return IS_SPEC_FUNCTION(observer) ? observer : observer.callback; | 158 return IS_SPEC_FUNCTION(observer) ? observer : observer.callback; |
154 } | 159 } |
155 | 160 |
156 function ObserverGetAcceptTypes(observer) { | 161 function ObserverGetAcceptTypes(observer) { |
157 return IS_SPEC_FUNCTION(observer) ? defaultAcceptTypes : observer.accept; | 162 return IS_SPEC_FUNCTION(observer) ? defaultAcceptTypes : observer.accept; |
158 } | 163 } |
159 | 164 |
160 function ObserverIsActive(observer, objectInfo) { | 165 function ObserverIsActive(observer, objectInfo) { |
161 return TypeMapIsDisjointFrom(ObjectInfoGetPerformingTypes(objectInfo), | 166 return TypeMapIsDisjointFrom(ObjectInfoGetPerformingTypes(objectInfo), |
162 ObserverGetAcceptTypes(observer)); | 167 ObserverGetAcceptTypes(observer)); |
163 } | 168 } |
164 | 169 |
165 function ObjectInfoGet(object) { | 170 function ObjectInfoGetOrCreate(object) { |
166 var objectInfo = objectInfoMap.get(object); | 171 var objectInfo = ObjectInfoGet(object); |
167 if (IS_UNDEFINED(objectInfo)) { | 172 if (IS_UNDEFINED(objectInfo)) { |
168 if (!%IsJSProxy(object)) | 173 if (!%IsJSProxy(object)) |
169 %SetIsObserved(object); | 174 %SetIsObserved(object); |
170 | 175 |
171 objectInfo = { | 176 objectInfo = { |
172 object: object, | 177 object: object, |
173 changeObservers: null, | 178 changeObservers: null, |
174 notifier: null, | 179 notifier: null, |
175 performing: null, | 180 performing: null, |
176 performingCount: 0, | 181 performingCount: 0, |
177 }; | 182 }; |
178 objectInfoMap.set(object, objectInfo); | 183 objectInfoMap.set(object, objectInfo); |
179 } | 184 } |
180 return objectInfo; | 185 return objectInfo; |
181 } | 186 } |
182 | 187 |
188 function ObjectInfoGet(object) { | |
189 return objectInfoMap.get(object); | |
190 } | |
191 | |
183 function ObjectInfoGetFromNotifier(notifier) { | 192 function ObjectInfoGetFromNotifier(notifier) { |
184 return notifierObjectInfoMap.get(notifier); | 193 return notifierObjectInfoMap.get(notifier); |
185 } | 194 } |
186 | 195 |
187 function ObjectInfoGetNotifier(objectInfo) { | 196 function ObjectInfoGetNotifier(objectInfo) { |
188 if (IS_NULL(objectInfo.notifier)) { | 197 if (IS_NULL(objectInfo.notifier)) { |
189 objectInfo.notifier = { __proto__: notifierPrototype }; | 198 objectInfo.notifier = { __proto__: notifierPrototype }; |
190 notifierObjectInfoMap.set(objectInfo.notifier, objectInfo); | 199 notifierObjectInfoMap.set(objectInfo.notifier, objectInfo); |
191 } | 200 } |
192 | 201 |
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205 // The set of observers on an object is called 'changeObservers'. The first | 214 // The set of observers on an object is called 'changeObservers'. The first |
206 // observer is referenced directly via objectInfo.changeObservers. When a second | 215 // observer is referenced directly via objectInfo.changeObservers. When a second |
207 // is added, changeObservers "normalizes" to become a mapping of callback | 216 // is added, changeObservers "normalizes" to become a mapping of callback |
208 // priority -> observer and is then stored on objectInfo.changeObservers. | 217 // priority -> observer and is then stored on objectInfo.changeObservers. |
209 function ObjectInfoNormalizeChangeObservers(objectInfo) { | 218 function ObjectInfoNormalizeChangeObservers(objectInfo) { |
210 if (ChangeObserversIsOptimized(objectInfo.changeObservers)) { | 219 if (ChangeObserversIsOptimized(objectInfo.changeObservers)) { |
211 var observer = objectInfo.changeObservers; | 220 var observer = objectInfo.changeObservers; |
212 var callback = ObserverGetCallback(observer); | 221 var callback = ObserverGetCallback(observer); |
213 var callbackInfo = CallbackInfoGet(callback); | 222 var callbackInfo = CallbackInfoGet(callback); |
214 var priority = CallbackInfoGetPriority(callbackInfo); | 223 var priority = CallbackInfoGetPriority(callbackInfo); |
215 objectInfo.changeObservers = { __proto__: null }; | 224 objectInfo.changeObservers = nullProtoObject(); |
216 objectInfo.changeObservers[priority] = observer; | 225 objectInfo.changeObservers[priority] = observer; |
217 } | 226 } |
218 } | 227 } |
219 | 228 |
220 function ObjectInfoAddObserver(objectInfo, callback, acceptList) { | 229 function ObjectInfoAddObserver(objectInfo, callback, acceptList) { |
221 var callbackInfo = CallbackInfoGetOrCreate(callback); | 230 var callbackInfo = CallbackInfoGetOrCreate(callback); |
222 var observer = ObserverCreate(callback, acceptList); | 231 var observer = ObserverCreate(callback, acceptList); |
223 | 232 |
224 if (!objectInfo.changeObservers) { | 233 if (!objectInfo.changeObservers) { |
225 objectInfo.changeObservers = observer; | 234 objectInfo.changeObservers = observer; |
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236 return; | 245 return; |
237 | 246 |
238 if (ChangeObserversIsOptimized(objectInfo.changeObservers)) { | 247 if (ChangeObserversIsOptimized(objectInfo.changeObservers)) { |
239 if (callback === ObserverGetCallback(objectInfo.changeObservers)) | 248 if (callback === ObserverGetCallback(objectInfo.changeObservers)) |
240 objectInfo.changeObservers = null; | 249 objectInfo.changeObservers = null; |
241 return; | 250 return; |
242 } | 251 } |
243 | 252 |
244 var callbackInfo = CallbackInfoGet(callback); | 253 var callbackInfo = CallbackInfoGet(callback); |
245 var priority = CallbackInfoGetPriority(callbackInfo); | 254 var priority = CallbackInfoGetPriority(callbackInfo); |
246 delete objectInfo.changeObservers[priority]; | 255 objectInfo.changeObservers[priority] = null; |
247 } | 256 } |
248 | 257 |
249 function ObjectInfoHasActiveObservers(objectInfo) { | 258 function ObjectInfoHasActiveObservers(objectInfo) { |
250 if (IS_UNDEFINED(objectInfo) || !objectInfo.changeObservers) | 259 if (IS_UNDEFINED(objectInfo) || !objectInfo.changeObservers) |
251 return false; | 260 return false; |
252 | 261 |
253 if (ChangeObserversIsOptimized(objectInfo.changeObservers)) | 262 if (ChangeObserversIsOptimized(objectInfo.changeObservers)) |
254 return ObserverIsActive(objectInfo.changeObservers, objectInfo); | 263 return ObserverIsActive(objectInfo.changeObservers, objectInfo); |
255 | 264 |
256 for (var priority in objectInfo.changeObservers) { | 265 for (var priority in objectInfo.changeObservers) { |
257 if (ObserverIsActive(objectInfo.changeObservers[priority], objectInfo)) | 266 var observer = objectInfo.changeObservers[priority]; |
267 if (!observer) | |
adamk
2014/01/03 01:00:32
Not sure how much is matters, but this could be IS
rossberg
2014/01/07 17:27:00
Yes, please use IS_NULL.
Also, you can just merge
rafaelw
2014/01/07 20:16:14
Done.
| |
268 continue; | |
269 if (ObserverIsActive(observer, objectInfo)) | |
258 return true; | 270 return true; |
259 } | 271 } |
260 | 272 |
261 return false; | 273 return false; |
262 } | 274 } |
263 | 275 |
264 function ObjectInfoAddPerformingType(objectInfo, type) { | 276 function ObjectInfoAddPerformingType(objectInfo, type) { |
265 objectInfo.performing = objectInfo.performing || TypeMapCreate(); | 277 objectInfo.performing = objectInfo.performing || TypeMapCreate(); |
266 TypeMapAddType(objectInfo.performing, type); | 278 TypeMapAddType(objectInfo.performing, type); |
267 objectInfo.performingCount++; | 279 objectInfo.performingCount++; |
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326 function ObjectObserve(object, callback, acceptList) { | 338 function ObjectObserve(object, callback, acceptList) { |
327 if (!IS_SPEC_OBJECT(object)) | 339 if (!IS_SPEC_OBJECT(object)) |
328 throw MakeTypeError("observe_non_object", ["observe"]); | 340 throw MakeTypeError("observe_non_object", ["observe"]); |
329 if (!IS_SPEC_FUNCTION(callback)) | 341 if (!IS_SPEC_FUNCTION(callback)) |
330 throw MakeTypeError("observe_non_function", ["observe"]); | 342 throw MakeTypeError("observe_non_function", ["observe"]); |
331 if (ObjectIsFrozen(callback)) | 343 if (ObjectIsFrozen(callback)) |
332 throw MakeTypeError("observe_callback_frozen"); | 344 throw MakeTypeError("observe_callback_frozen"); |
333 if (!AcceptArgIsValid(acceptList)) | 345 if (!AcceptArgIsValid(acceptList)) |
334 throw MakeTypeError("observe_accept_invalid"); | 346 throw MakeTypeError("observe_accept_invalid"); |
335 | 347 |
336 var objectInfo = ObjectInfoGet(object); | 348 var objectInfo = ObjectInfoGetOrCreate(object); |
337 ObjectInfoAddObserver(objectInfo, callback, acceptList); | 349 ObjectInfoAddObserver(objectInfo, callback, acceptList); |
338 return object; | 350 return object; |
339 } | 351 } |
340 | 352 |
341 function ObjectUnobserve(object, callback) { | 353 function ObjectUnobserve(object, callback) { |
342 if (!IS_SPEC_OBJECT(object)) | 354 if (!IS_SPEC_OBJECT(object)) |
343 throw MakeTypeError("observe_non_object", ["unobserve"]); | 355 throw MakeTypeError("observe_non_object", ["unobserve"]); |
344 if (!IS_SPEC_FUNCTION(callback)) | 356 if (!IS_SPEC_FUNCTION(callback)) |
345 throw MakeTypeError("observe_non_function", ["unobserve"]); | 357 throw MakeTypeError("observe_non_function", ["unobserve"]); |
346 | 358 |
347 var objectInfo = objectInfoMap.get(object); | 359 var objectInfo = ObjectInfoGet(object); |
348 if (IS_UNDEFINED(objectInfo)) | 360 if (IS_UNDEFINED(objectInfo)) |
349 return object; | 361 return object; |
350 | 362 |
351 ObjectInfoRemoveObserver(objectInfo, callback); | 363 ObjectInfoRemoveObserver(objectInfo, callback); |
352 return object; | 364 return object; |
353 } | 365 } |
354 | 366 |
355 function ArrayObserve(object, callback) { | 367 function ArrayObserve(object, callback) { |
356 return ObjectObserve(object, callback, ['add', | 368 return ObjectObserve(object, callback, ['add', |
357 'update', | 369 'update', |
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374 if (needsAccessCheck && | 386 if (needsAccessCheck && |
375 // Drop all splice records on the floor for access-checked objects | 387 // Drop all splice records on the floor for access-checked objects |
376 (changeRecord.type == 'splice' || | 388 (changeRecord.type == 'splice' || |
377 !%IsAccessAllowedForObserver( | 389 !%IsAccessAllowedForObserver( |
378 callback, changeRecord.object, changeRecord.name))) { | 390 callback, changeRecord.object, changeRecord.name))) { |
379 return; | 391 return; |
380 } | 392 } |
381 | 393 |
382 var callbackInfo = CallbackInfoNormalize(callback); | 394 var callbackInfo = CallbackInfoNormalize(callback); |
383 if (!observationState.pendingObservers) | 395 if (!observationState.pendingObservers) |
384 observationState.pendingObservers = { __proto__: null }; | 396 observationState.pendingObservers = nullProtoObject(); |
385 observationState.pendingObservers[callbackInfo.priority] = callback; | 397 observationState.pendingObservers[callbackInfo.priority] = callback; |
386 callbackInfo.push(changeRecord); | 398 callbackInfo.push(changeRecord); |
387 %SetMicrotaskPending(true); | 399 %SetMicrotaskPending(true); |
388 } | 400 } |
389 | 401 |
390 function ObjectInfoEnqueueExternalChangeRecord(objectInfo, changeRecord, type) { | 402 function ObjectInfoEnqueueExternalChangeRecord(objectInfo, changeRecord, type) { |
391 if (!ObjectInfoHasActiveObservers(objectInfo)) | 403 if (!ObjectInfoHasActiveObservers(objectInfo)) |
392 return; | 404 return; |
393 | 405 |
394 var hasType = !IS_UNDEFINED(type); | 406 var hasType = !IS_UNDEFINED(type); |
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417 | 429 |
418 if (ChangeObserversIsOptimized(objectInfo.changeObservers)) { | 430 if (ChangeObserversIsOptimized(objectInfo.changeObservers)) { |
419 var observer = objectInfo.changeObservers; | 431 var observer = objectInfo.changeObservers; |
420 ObserverEnqueueIfActive(observer, objectInfo, changeRecord, | 432 ObserverEnqueueIfActive(observer, objectInfo, changeRecord, |
421 needsAccessCheck); | 433 needsAccessCheck); |
422 return; | 434 return; |
423 } | 435 } |
424 | 436 |
425 for (var priority in objectInfo.changeObservers) { | 437 for (var priority in objectInfo.changeObservers) { |
426 var observer = objectInfo.changeObservers[priority]; | 438 var observer = objectInfo.changeObservers[priority]; |
439 if (!observer) | |
adamk
2014/01/03 01:00:32
Ditto
rafaelw
2014/01/07 20:16:14
Done.
| |
440 continue; | |
427 ObserverEnqueueIfActive(observer, objectInfo, changeRecord, | 441 ObserverEnqueueIfActive(observer, objectInfo, changeRecord, |
428 needsAccessCheck); | 442 needsAccessCheck); |
429 } | 443 } |
430 } | 444 } |
431 | 445 |
432 function BeginPerformSplice(array) { | 446 function BeginPerformSplice(array) { |
433 var objectInfo = objectInfoMap.get(array); | 447 var objectInfo = ObjectInfoGet(array); |
434 if (!IS_UNDEFINED(objectInfo)) | 448 if (!IS_UNDEFINED(objectInfo)) |
435 ObjectInfoAddPerformingType(objectInfo, 'splice'); | 449 ObjectInfoAddPerformingType(objectInfo, 'splice'); |
436 } | 450 } |
437 | 451 |
438 function EndPerformSplice(array) { | 452 function EndPerformSplice(array) { |
439 var objectInfo = objectInfoMap.get(array); | 453 var objectInfo = ObjectInfoGet(array); |
440 if (!IS_UNDEFINED(objectInfo)) | 454 if (!IS_UNDEFINED(objectInfo)) |
441 ObjectInfoRemovePerformingType(objectInfo, 'splice'); | 455 ObjectInfoRemovePerformingType(objectInfo, 'splice'); |
442 } | 456 } |
443 | 457 |
444 function EnqueueSpliceRecord(array, index, removed, addedCount) { | 458 function EnqueueSpliceRecord(array, index, removed, addedCount) { |
445 var objectInfo = objectInfoMap.get(array); | 459 var objectInfo = ObjectInfoGet(array); |
446 if (!ObjectInfoHasActiveObservers(objectInfo)) | 460 if (!ObjectInfoHasActiveObservers(objectInfo)) |
447 return; | 461 return; |
448 | 462 |
449 var changeRecord = { | 463 var changeRecord = { |
450 type: 'splice', | 464 type: 'splice', |
451 object: array, | 465 object: array, |
452 index: index, | 466 index: index, |
453 removed: removed, | 467 removed: removed, |
454 addedCount: addedCount | 468 addedCount: addedCount |
455 }; | 469 }; |
456 | 470 |
457 ObjectFreeze(changeRecord); | 471 ObjectFreeze(changeRecord); |
458 ObjectFreeze(changeRecord.removed); | 472 ObjectFreeze(changeRecord.removed); |
459 ObjectInfoEnqueueInternalChangeRecord(objectInfo, changeRecord); | 473 ObjectInfoEnqueueInternalChangeRecord(objectInfo, changeRecord); |
460 } | 474 } |
461 | 475 |
462 function NotifyChange(type, object, name, oldValue) { | 476 function NotifyChange(type, object, name, oldValue) { |
463 var objectInfo = objectInfoMap.get(object); | 477 var objectInfo = ObjectInfoGet(object); |
464 if (!ObjectInfoHasActiveObservers(objectInfo)) | 478 if (!ObjectInfoHasActiveObservers(objectInfo)) |
465 return; | 479 return; |
466 | 480 |
467 var changeRecord; | 481 var changeRecord; |
468 if (arguments.length == 2) { | 482 if (arguments.length == 2) { |
469 changeRecord = { type: type, object: object }; | 483 changeRecord = { type: type, object: object }; |
470 } else if (arguments.length == 3) { | 484 } else if (arguments.length == 3) { |
471 changeRecord = { type: type, object: object, name: name }; | 485 changeRecord = { type: type, object: object, name: name }; |
472 } else { | 486 } else { |
473 changeRecord = { | 487 changeRecord = { |
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522 if (IS_SPEC_OBJECT(changeRecord)) | 536 if (IS_SPEC_OBJECT(changeRecord)) |
523 ObjectInfoEnqueueExternalChangeRecord(objectInfo, changeRecord, changeType); | 537 ObjectInfoEnqueueExternalChangeRecord(objectInfo, changeRecord, changeType); |
524 } | 538 } |
525 | 539 |
526 function ObjectGetNotifier(object) { | 540 function ObjectGetNotifier(object) { |
527 if (!IS_SPEC_OBJECT(object)) | 541 if (!IS_SPEC_OBJECT(object)) |
528 throw MakeTypeError("observe_non_object", ["getNotifier"]); | 542 throw MakeTypeError("observe_non_object", ["getNotifier"]); |
529 | 543 |
530 if (ObjectIsFrozen(object)) return null; | 544 if (ObjectIsFrozen(object)) return null; |
531 | 545 |
532 var objectInfo = ObjectInfoGet(object); | 546 var objectInfo = ObjectInfoGetOrCreate(object); |
533 return ObjectInfoGetNotifier(objectInfo); | 547 return ObjectInfoGetNotifier(objectInfo); |
534 } | 548 } |
535 | 549 |
536 function CallbackDeliverPending(callback) { | 550 function CallbackDeliverPending(callback) { |
537 var callbackInfo = callbackInfoMap.get(callback); | 551 var callbackInfo = callbackInfoMap.get(callback); |
538 if (IS_UNDEFINED(callbackInfo) || IS_NUMBER(callbackInfo)) | 552 if (IS_UNDEFINED(callbackInfo) || IS_NUMBER(callbackInfo)) |
539 return false; | 553 return false; |
540 | 554 |
541 // Clear the pending change records from callback and return it to its | 555 // Clear the pending change records from callback and return it to its |
542 // "optimized" state. | 556 // "optimized" state. |
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585 "observe", ArrayObserve, | 599 "observe", ArrayObserve, |
586 "unobserve", ArrayUnobserve | 600 "unobserve", ArrayUnobserve |
587 )); | 601 )); |
588 InstallFunctions(notifierPrototype, DONT_ENUM, $Array( | 602 InstallFunctions(notifierPrototype, DONT_ENUM, $Array( |
589 "notify", ObjectNotifierNotify, | 603 "notify", ObjectNotifierNotify, |
590 "performChange", ObjectNotifierPerformChange | 604 "performChange", ObjectNotifierPerformChange |
591 )); | 605 )); |
592 } | 606 } |
593 | 607 |
594 SetupObjectObserve(); | 608 SetupObjectObserve(); |
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