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/*
This file is part of GNU Taler
(C) 2019 GNUnet e.V.
GNU 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.
GNU 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
GNU Taler; see the file COPYING. If not, see <http://www.gnu.org/licenses/>
*/
export interface MemoEntry<T> {
p: Promise<T>;
t: number;
n: number;
}
export class AsyncOpMemo<T> {
private n = 0;
private memo: { [k: string]: MemoEntry<T> } = {};
put(key: string, p: Promise<T>): Promise<T> {
const n = this.n++;
this.memo[key] = {
p,
n,
t: new Date().getTime(),
};
p.finally(() => {
const r = this.memo[key];
if (r && r.n === n) {
delete this.memo[key];
}
});
return p;
}
find(key: string): Promise<T> | undefined {
const res = this.memo[key];
const tNow = new Date().getTime();
if (res && res.t < tNow - 10 * 1000) {
delete this.memo[key];
return;
} else if (res) {
return res.p;
}
return;
}
}
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