blob: e05ed8e14254367f4f9aed768102737458de93f2 [file] [log] [blame]
// Copyright (c) 2013, the Dart project authors. Please see the AUTHORS file
// for details. All rights reserved. Use of this source code is governed by a
// BSD-style license that can be found in the LICENSE file.
import 'package:expect/expect.dart';
import 'package:async_helper/async_helper.dart';
import 'dart:async';
main() {
Completer done = new Completer();
var valueToCapture;
var restoredValue;
Expect.identical(Zone.ROOT, Zone.current);
Zone forked = Zone.current.fork(specification: new ZoneSpecification(
registerCallback: (Zone self, ZoneDelegate parent, Zone origin, f()) {
// The zone is still the same as when was invoked, which
// is the root zone. (The origin zone hasn't been set yet).
Expect.identical(Zone.current, Zone.ROOT);
// Note that not forwarding is completely legal, though not encouraged.
var capturedValue = valueToCapture;
return parent.registerCallback(origin, () {
restoredValue = capturedValue;
return f();
valueToCapture = 499;
var fun = () => 99;
var registered = forked.registerCallback(fun);
Expect.isFalse(identical(fun, registered));
// It is legal to invoke the callback in a different zone. This is, of course,
// extremely discouraged.
var result = registered();
Expect.equals(99, result);
Expect.equals(499, restoredValue);