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/*
This file is part of GNU Taler
(C) 2019 GNUnet e.V.
TALER is free software; you can redistribute it and/or modify it under the
terms of the GNU General Public License as published by the Free Software
Foundation; either version 3, or (at your option) any later version.
TALER is distributed in the hope that it will be useful, but WITHOUT ANY
WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
A PARTICULAR PURPOSE. See the GNU General Public License for more details.
You should have received a copy of the GNU General Public License along with
TALER; see the file COPYING. If not, see <http://www.gnu.org/licenses/>
*/
export interface OpenedPromise<T> {
promise: Promise<T>;
resolve: (val: T) => void;
reject: (err: any) => void;
}
/**
* Get an unresolved promise together with its extracted resolve / reject
* function.
*/
export function openPromise<T>(): OpenedPromise<T> {
let resolve: ((x?: any) => void) | null = null;
let reject: ((reason?: any) => void) | null = null;
const promise = new Promise<T>((res, rej) => {
resolve = res;
reject = rej;
});
if (!(resolve && reject)) {
// Never happens, unless JS implementation is broken
throw Error();
}
return { resolve, reject, promise };
}
export class AsyncCondition {
private _waitPromise: Promise<void>;
private _resolveWaitPromise: (val: void) => void;
constructor() {
const op = openPromise<void>();
this._waitPromise = op.promise;
this._resolveWaitPromise = op.resolve;
}
wait(): Promise<void> {
return this._waitPromise;
}
trigger(): void {
this._resolveWaitPromise();
const op = openPromise<void>();
this._waitPromise = op.promise;
this._resolveWaitPromise = op.resolve;
}
}
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