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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 | 1x 1x 2x 2x 2x 2x 5x 5x 5x | import { IBackoffStrategy } from "./BackoffStrategy";
import { wait } from "./Wait";
/**
* Exponential backoff strategy that when supplied with a startMs value will
* increment the timeout based on powers of the base. It uses the general
* exponential function equation:
*
* ```
* timeout = ab^x
* ```
*/
export class ExponentialBackoff implements IBackoffStrategy {
public timeout: number;
public exp: number;
constructor(
readonly startMs: number,
readonly base: number,
readonly waitFn: (timeoutMs: number) => Promise<void> = wait,
) {
this.exp = 0;
}
public async backoff(): Promise<void> {
const timeout = this.startMs * Math.pow(this.base, this.exp);
await this.waitFn(timeout);
this.exp++;
}
}
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