File size: 833 Bytes
4e1096a | 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 | export class AsyncQueue<T> {
private queue: T[] = [];
private resolves: ((value: void) => void)[] = [];
private done = false;
enqueue(item: T) {
this.queue.push(item);
if (this.resolves.length > 0) {
const resolve = this.resolves.shift();
resolve?.();
}
}
finish() {
this.done = true;
while (this.resolves.length > 0) {
const resolve = this.resolves.shift();
resolve?.();
}
}
async dequeue(): Promise<T | null> {
if (this.queue.length > 0) {
return this.queue.shift()!;
}
if (this.done) {
return null;
}
return new Promise<T | null>((resolve) => {
this.resolves.push(() => {
if (this.queue.length > 0) {
resolve(this.queue.shift()!);
} else {
resolve(null);
}
});
});
}
}
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