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| 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 | 7x 1260x 1260x 7x 67x 67x 1260x 1260x 1260x 1167x 1167x 1260x 1260x 1260x 1253x 7x 1260x 1260x 1260x 1260x 93x 93x | import {Defer} from 'thingies/lib/Defer';
class Entry<T> {
constructor(
public readonly code: () => Promise<T>,
public readonly future: Defer<T>,
) {}
}
export class Mutex {
protected readonly queue = new Map<string, Entry<unknown>[]>();
public readonly acquire = async <T>(key: string, code: () => Promise<T>): Promise<T> => {
const queue = this.queue.get(key);
const entry = new Entry(code, new Defer<T>());
if (queue instanceof Array) queue.push(entry as Entry<unknown>);
else {
this.queue.set(key, []);
this.run(key, entry).catch(() => {});
}
return await entry.future.promise;
};
protected async run<T>(key: string, entry: Entry<T>): Promise<void> {
try {
const result = await entry.code();
entry.future.resolve(result);
} catch (error) {
entry.future.reject(error);
} finally {
const queue = this.queue;
const entries = queue.get(key);
Eif (entries instanceof Array) {
if (!entries.length) queue.delete(key);
else {
const next = entries.shift();
Eif (next instanceof Entry) this.run(key, next).catch(() => {});
}
}
}
}
}
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