blob: 822b7500c777e76766692a8e90c6a33f6ebbcad4 [file] [log] [blame]
// Copyright (c) 2021, 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.
class CancelableToken extends CancellationToken {
bool _isCancelled = false;
bool get isCancellationRequested => _isCancelled;
void cancel() => _isCancelled = true;
/// A token used to signal cancellation of an operation. This allows computation
/// to be skipped when a caller is no longer interested in the result, for example
/// when a $/cancel request is recieved for an in-progress request.
abstract class CancellationToken {
bool get isCancellationRequested;
/// A [CancellationToken] that cannot be cancelled.
class NotCancelableToken extends CancellationToken {
bool get isCancellationRequested => false;