/**
* Copyright 2017-2020 Plexus Interop Deutsche Bank AG
* SPDX-License-Identifier: Apache-2.0
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
import { ReadOnlyCancellationToken } from './ReadOnlyCancellationToken';
import { Logger, LoggerFactory } from '../../logger';
const logger: Logger = LoggerFactory.getLogger('CancellationToken');
export type CancelListener = (reason: any) => void;
export class CancellationToken implements ReadOnlyCancellationToken {
private cancelled: boolean = false;
private reason: string = 'Not defined';
private listeners: CancelListener[] = [];
constructor(private readonly baseToken?: CancellationToken) { }
public throwIfCanceled(): void {
if (this.isCancelled()) {
throw Error(this.getReason());
}
}
public onCancel(callback: CancelListener): void {
if (this.listeners.indexOf(callback) === -1) {
this.listeners.push(callback);
}
}
public isCancelled(): boolean {
Iif (this.baseToken) {
return this.cancelled || this.baseToken.isCancelled();
} else {
return this.cancelled;
}
}
public cancel(Ireason: string = 'Operation cancelled'): void {
Eif (!this.cancelled) {
this.reason = reason;
this.listeners.forEach(listener => {
try {
listener(reason);
} catch (error) {
logger.warn('Cancellation listener raised error', error);
}
});
this.cancelled = true;
}
}
public getReason(): string {
return this.baseToken && this.baseToken.cancelled ? this.baseToken.getReason() : this.reason;
}
} |