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a2b556b937
Change-Id: Ia5c41dda6503e1fbb8cc6099835d07588425e2ba Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/128310 Commit-Queue: Bob Nystrom <rnystrom@google.com> Auto-Submit: Bob Nystrom <rnystrom@google.com> Reviewed-by: Lasse R.H. Nielsen <lrn@google.com>
41 lines
1.4 KiB
Dart
41 lines
1.4 KiB
Dart
// Copyright (c) 2013, the Dart project authors. Please see the AUTHORS file
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// for details. All rights reserved. Use of this source code is governed by a
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// BSD-style license that can be found in the LICENSE file.
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import 'package:expect/expect.dart';
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import 'package:async_helper/async_helper.dart';
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import 'dart:async';
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main() {
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Completer done = new Completer();
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var valueToCapture;
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var restoredValue;
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Expect.identical(Zone.root, Zone.current);
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Zone forked = Zone.current.fork(specification: new ZoneSpecification(
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registerCallback:
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<R>(Zone self, ZoneDelegate parent, Zone origin, R f()) {
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// The zone is still the same as when origin.run was invoked, which
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// is the root zone. (The origin zone hasn't been set yet).
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Expect.identical(Zone.current, Zone.root);
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// Note that not forwarding is completely legal, though not encouraged.
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var capturedValue = valueToCapture;
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return parent.registerCallback(origin, () {
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restoredValue = capturedValue;
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return f();
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});
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}));
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valueToCapture = 499;
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var fun = () => 99;
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var registered = forked.registerCallback<dynamic>(fun);
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Expect.isFalse(identical(fun, registered));
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// It is legal to invoke the callback in a different zone. This is, of course,
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// extremely discouraged.
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var result = registered();
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Expect.equals(99, result);
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Expect.equals(499, restoredValue);
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}
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