src/pools/selection-strategies/selection-strategies-types.ts

   1 /**
   2  * Enumeration of worker choice strategies.
   3  */
   4 export const WorkerChoiceStrategies = Object.freeze({
   5   /**
   6    * Round robin worker selection strategy.
   7    */
   8   ROUND_ROBIN: 'ROUND_ROBIN',
   9   /**
  10    * Less used worker selection strategy.
  11    */
  12   LESS_USED: 'LESS_USED',
  13   /**
  14    * Less busy worker selection strategy.
  15    */
  16   LESS_BUSY: 'LESS_BUSY',
  17   /**
  18    * Fair share worker selection strategy.
  19    */
  20   FAIR_SHARE: 'FAIR_SHARE',
  21   /**
  22    * Weighted round robin worker selection strategy.
  23    */
  24   WEIGHTED_ROUND_ROBIN: 'WEIGHTED_ROUND_ROBIN'
  25 } as const)
  26
  27 /**
  28  * Worker choice strategy.
  29  */
  30 export type WorkerChoiceStrategy = keyof typeof WorkerChoiceStrategies
  31
  32 /**
  33  * Worker choice strategy options.
  34  */
  35 export interface WorkerChoiceStrategyOptions {
  36   /**
  37    * Use tasks median run time instead of average run time.
  38    */
  39   medRunTime?: boolean
  40 }
  41
  42 /**
  43  * Pool worker tasks usage statistics requirements.
  44  */
  45 export interface RequiredStatistics {
  46   runTime: boolean
  47   avgRunTime: boolean
  48   medRunTime: boolean
  49 }
  50
  51 /**
  52  * Worker choice strategy interface.
  53  */
  54 export interface IWorkerChoiceStrategy {
  55   /**
  56    * Required tasks usage statistics.
  57    */
  58   readonly requiredStatistics: RequiredStatistics
  59   /**
  60    * Resets strategy internals (counters, statistics, etc.).
  61    */
  62   reset: () => boolean
  63   /**
  64    * Chooses a worker node in the pool and returns its key.
  65    */
  66   choose: () => number
  67   /**
  68    * Removes a worker node key from strategy internals.
  69    *
  70    * @param workerNodeKey - The worker node key.
  71    */
  72   remove: (workerNodeKey: number) => boolean
  73 }