| 1 | import type { IPoolWorker } from '../pool-worker' |
| 2 | import { AbstractWorkerChoiceStrategy } from './abstract-worker-choice-strategy' |
| 3 | |
| 4 | /** |
| 5 | * Selects the less recently used worker. |
| 6 | * |
| 7 | * @typeParam Worker - Type of worker which manages the strategy. |
| 8 | * @typeParam Data - Type of data sent to the worker. This can only be serializable data. |
| 9 | * @typeParam Response - Type of response of execution. This can only be serializable data. |
| 10 | */ |
| 11 | export class LessRecentlyUsedWorkerChoiceStrategy< |
| 12 | Worker extends IPoolWorker, |
| 13 | Data, |
| 14 | Response |
| 15 | > extends AbstractWorkerChoiceStrategy<Worker, Data, Response> { |
| 16 | /** {@inheritDoc} */ |
| 17 | public reset (): boolean { |
| 18 | return true |
| 19 | } |
| 20 | |
| 21 | /** {@inheritDoc} */ |
| 22 | public choose (): Worker { |
| 23 | let minNumberOfRunningTasks = Infinity |
| 24 | // A worker is always found because it picks the one with fewer tasks |
| 25 | let lessRecentlyUsedWorker!: Worker |
| 26 | for (const worker of this.pool.workers) { |
| 27 | const workerRunningTasks = this.pool.getWorkerRunningTasks( |
| 28 | worker |
| 29 | ) as number |
| 30 | if (!this.isDynamicPool && workerRunningTasks === 0) { |
| 31 | return worker |
| 32 | } else if (workerRunningTasks < minNumberOfRunningTasks) { |
| 33 | lessRecentlyUsedWorker = worker |
| 34 | minNumberOfRunningTasks = workerRunningTasks |
| 35 | } |
| 36 | } |
| 37 | return lessRecentlyUsedWorker |
| 38 | } |
| 39 | } |