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[poolifier.git] / src / pools / selection-strategies / selection-strategies-types.ts

import type { AbstractPoolWorker } from '../abstract-pool-worker'

/**
 * Enumeration of worker choice strategies.
 */
export const WorkerChoiceStrategies = Object.freeze({
  /**
   * Round robin worker selection strategy.
   */
  ROUND_ROBIN: 'ROUND_ROBIN',
  /**
   * Less recently used worker selection strategy.
   */
  LESS_RECENTLY_USED: 'LESS_RECENTLY_USED',
  /**
   * Fair share worker selection strategy.
   */
  FAIR_SHARE: 'FAIR_SHARE',
  /**
   * Weighted round robin worker selection strategy.
   */
  WEIGHTED_ROUND_ROBIN: 'WEIGHTED_ROUND_ROBIN'
} as const)

/**
 * Worker choice strategy.
 */
export type WorkerChoiceStrategy = keyof typeof WorkerChoiceStrategies

/**
 * Worker choice strategy interface.
 *
 * @template Worker Type of worker which manages the strategy.
 */
export interface IWorkerChoiceStrategy<Worker extends AbstractPoolWorker> {
  /**
   * Is the pool attached to the strategy dynamic?.
   */
  isDynamicPool: boolean
  /**
   * Choose a worker in the pool.
   */
  choose(): Worker
}