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Side by Side Diff: sdk/lib/async/future.dart

Issue 2963743002: Revert "Make Zone API strong mode clean." (Closed)
Patch Set: Created 3 years, 5 months ago
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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 /// A type representing values that are either `Future<T>` or `T`. 7 /// A type representing values that are either `Future<T>` or `T`.
8 /// 8 ///
9 /// This class declaration is a public stand-in for an internal 9 /// This class declaration is a public stand-in for an internal
10 /// future-or-value generic type. References to this class are resolved to the 10 /// future-or-value generic type. References to this class are resolved to the
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512 * the previous call has returned, and if it returned a `Future<bool>`, not 512 * the previous call has returned, and if it returned a `Future<bool>`, not
513 * until that future has completed. 513 * until that future has completed.
514 */ 514 */
515 static Future doWhile(FutureOr<bool> action()) { 515 static Future doWhile(FutureOr<bool> action()) {
516 _Future doneSignal = new _Future(); 516 _Future doneSignal = new _Future();
517 var nextIteration; 517 var nextIteration;
518 // Bind this callback explicitly so that each iteration isn't bound in the 518 // Bind this callback explicitly so that each iteration isn't bound in the
519 // context of all the previous iterations' callbacks. 519 // context of all the previous iterations' callbacks.
520 // This avoids, e.g., deeply nested stack traces from the stack trace 520 // This avoids, e.g., deeply nested stack traces from the stack trace
521 // package. 521 // package.
522 nextIteration = Zone.current.bindUnaryCallbackGuarded((bool keepGoing) { 522 nextIteration = Zone.current.bindUnaryCallback((bool keepGoing) {
523 while (keepGoing) { 523 while (keepGoing) {
524 FutureOr<bool> result; 524 FutureOr<bool> result;
525 try { 525 try {
526 result = action(); 526 result = action();
527 } catch (error, stackTrace) { 527 } catch (error, stackTrace) {
528 // Cannot use _completeWithErrorCallback because it completes 528 // Cannot use _completeWithErrorCallback because it completes
529 // the future synchronously. 529 // the future synchronously.
530 _asyncCompleteWithErrorCallback(doneSignal, error, stackTrace); 530 _asyncCompleteWithErrorCallback(doneSignal, error, stackTrace);
531 return; 531 return;
532 } 532 }
533 if (result is Future<bool>) { 533 if (result is Future<bool>) {
534 result.then(nextIteration, onError: doneSignal._completeError); 534 result.then(nextIteration, onError: doneSignal._completeError);
535 return; 535 return;
536 } 536 }
537 keepGoing = result; 537 keepGoing = result;
538 } 538 }
539 doneSignal._complete(null); 539 doneSignal._complete(null);
540 }); 540 }, runGuarded: true);
541 nextIteration(true); 541 nextIteration(true);
542 return doneSignal; 542 return doneSignal;
543 } 543 }
544 544
545 /** 545 /**
546 * Register callbacks to be called when this future completes. 546 * Register callbacks to be called when this future completes.
547 * 547 *
548 * When this future completes with a value, 548 * When this future completes with a value,
549 * the [onValue] callback will be called with that value. 549 * the [onValue] callback will be called with that value.
550 * If this future is already completed, the callback will not be called 550 * If this future is already completed, the callback will not be called
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909 AsyncError replacement = Zone.current.errorCallback(error, stackTrace); 909 AsyncError replacement = Zone.current.errorCallback(error, stackTrace);
910 if (replacement != null) { 910 if (replacement != null) {
911 error = _nonNullError(replacement.error); 911 error = _nonNullError(replacement.error);
912 stackTrace = replacement.stackTrace; 912 stackTrace = replacement.stackTrace;
913 } 913 }
914 result._asyncCompleteError(error, stackTrace); 914 result._asyncCompleteError(error, stackTrace);
915 } 915 }
916 916
917 /** Helper function that converts `null` to a [NullThrownError]. */ 917 /** Helper function that converts `null` to a [NullThrownError]. */
918 Object _nonNullError(Object error) => error ?? new NullThrownError(); 918 Object _nonNullError(Object error) => error ?? new NullThrownError();
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