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37 lines (29 loc) · 1.01 KB
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/*---------------------------------------------------------------------------------------------
* Copyright (c) Microsoft Corporation. All rights reserved.
* Licensed under the MIT License. See License.txt in the project root for license information.
*--------------------------------------------------------------------------------------------*/
import { CancellationToken, CancellationTokenSource } from 'vs/base/common/cancellation';
import { IDisposable } from 'vs/base/common/lifecycle';
export interface CacheResult<T> extends IDisposable {
promise: Promise<T>;
}
export class Cache<T> {
private result: CacheResult<T> | null = null;
constructor(private task: (ct: CancellationToken) => Promise<T>) { }
get(): CacheResult<T> {
if (this.result) {
return this.result;
}
const cts = new CancellationTokenSource();
const promise = this.task(cts.token);
this.result = {
promise,
dispose: () => {
this.result = null;
cts.cancel();
cts.dispose();
}
};
return this.result;
}
}