src/pools/selection-strategies/less-used-worker-choice-strategy.ts

   1 import type { IPoolWorker } from '../pool-worker'
   2 import { AbstractWorkerChoiceStrategy } from './abstract-worker-choice-strategy'
   3
   4 /**
   5  * Selects the less 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 LessUsedWorkerChoiceStrategy<
  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 (): number {
  23     let minNumberOfTasks = Infinity
  24     let lessUsedWorkerKey!: number
  25     for (const [index, workerItem] of this.pool.workers.entries()) {
  26       const tasksUsage = workerItem.tasksUsage
  27       const workerTasks = tasksUsage?.run + tasksUsage?.running
  28       if (!this.isDynamicPool && workerTasks === 0) {
  29         return index
  30       } else if (workerTasks < minNumberOfTasks) {
  31         minNumberOfTasks = workerTasks
  32         lessUsedWorkerKey = index
  33       }
  34     }
  35     return lessUsedWorkerKey
  36   }
  37
  38   /** {@inheritDoc} */
  39   public remove (workerKey: number): boolean {
  40     return true
  41   }
  42 }