| 1 | import type { IPoolWorker } from '../pool-worker' |
| 2 | import { AbstractWorkerChoiceStrategy } from './abstract-worker-choice-strategy' |
| 3 | |
| 4 | /** |
| 5 | * Selects the next worker in a round robin fashion. |
| 6 | * |
| 7 | * @template Worker Type of worker which manages the strategy. |
| 8 | * @template Data Type of data sent to the worker. This can only be serializable data. |
| 9 | * @template Response Type of response of execution. This can only be serializable data. |
| 10 | */ |
| 11 | export class RoundRobinWorkerChoiceStrategy< |
| 12 | Worker extends IPoolWorker, |
| 13 | Data, |
| 14 | Response |
| 15 | > extends AbstractWorkerChoiceStrategy<Worker, Data, Response> { |
| 16 | /** |
| 17 | * Index for the next worker. |
| 18 | */ |
| 19 | private nextWorkerIndex: number = 0 |
| 20 | |
| 21 | /** @inheritDoc */ |
| 22 | public reset (): boolean { |
| 23 | this.nextWorkerIndex = 0 |
| 24 | return true |
| 25 | } |
| 26 | |
| 27 | /** @inheritDoc */ |
| 28 | public choose (): Worker { |
| 29 | const chosenWorker = this.pool.workers[this.nextWorkerIndex] |
| 30 | this.nextWorkerIndex = |
| 31 | this.nextWorkerIndex === this.pool.workers.length - 1 |
| 32 | ? 0 |
| 33 | : this.nextWorkerIndex + 1 |
| 34 | return chosenWorker |
| 35 | } |
| 36 | } |