/**
* The next worker node key.
*/
- protected nextWorkerNodeKey: number = 0
+ protected nextWorkerNodeKey: number | undefined = 0
+
+ /**
+ * The previous worker node key.
+ */
+ protected previousWorkerNodeKey: number = 0
/** @inheritDoc */
public readonly strategyPolicy: StrategyPolicy = {
- useDynamicWorker: false
+ dynamicWorkerUsage: false,
+ dynamicWorkerReady: true
}
/** @inheritDoc */
protected readonly pool: IPool<Worker, Data, Response>,
protected opts: WorkerChoiceStrategyOptions = DEFAULT_WORKER_CHOICE_STRATEGY_OPTIONS
) {
+ this.opts = { ...DEFAULT_WORKER_CHOICE_STRATEGY_OPTIONS, ...opts }
this.choose = this.choose.bind(this)
}
}
}
+ protected resetWorkerNodeKeyProperties (): void {
+ this.nextWorkerNodeKey = 0
+ this.previousWorkerNodeKey = 0
+ }
+
/** @inheritDoc */
public abstract reset (): boolean
public abstract update (workerNodeKey: number): boolean
/** @inheritDoc */
- public abstract choose (): number
+ public abstract choose (): number | undefined
/** @inheritDoc */
public abstract remove (workerNodeKey: number): boolean
/** @inheritDoc */
public setOptions (opts: WorkerChoiceStrategyOptions): void {
- this.opts = opts ?? DEFAULT_WORKER_CHOICE_STRATEGY_OPTIONS
+ this.opts = { ...DEFAULT_WORKER_CHOICE_STRATEGY_OPTIONS, ...opts }
this.setTaskStatisticsRequirements(this.opts)
}
* @param workerNodeKey - The worker node key.
* @returns Whether the worker node is ready or not.
*/
- protected isWorkerNodeReady (workerNodeKey: number): boolean {
+ private isWorkerNodeReady (workerNodeKey: number): boolean {
return this.pool.workerNodes[workerNodeKey].info.ready
}
/**
- * Gets the worker task runtime.
+ * Whether the worker node has back pressure or not (i.e. its tasks queue is full).
+ *
+ * @param workerNodeKey - The worker node key.
+ * @returns `true` if the worker node has back pressure, `false` otherwise.
+ */
+ private hasWorkerNodeBackPressure (workerNodeKey: number): boolean {
+ return this.pool.hasWorkerNodeBackPressure(workerNodeKey)
+ }
+
+ /**
+ * Whether the worker node is eligible or not.
+ * A worker node is eligible if it is ready and does not have back pressure.
+ *
+ * @param workerNodeKey - The worker node key.
+ * @returns `true` if the worker node is eligible, `false` otherwise.
+ * @see {@link isWorkerNodeReady}
+ * @see {@link hasWorkerNodeBackPressure}
+ */
+ protected isWorkerNodeEligible (workerNodeKey: number): boolean {
+ return (
+ this.isWorkerNodeReady(workerNodeKey) &&
+ !this.hasWorkerNodeBackPressure(workerNodeKey)
+ )
+ }
+
+ /**
+ * Gets the worker node task runtime.
* If the task statistics require the average runtime, the average runtime is returned.
* If the task statistics require the median runtime , the median runtime is returned.
*
* @param workerNodeKey - The worker node key.
- * @returns The worker task runtime.
+ * @returns The worker node task runtime.
*/
- protected getWorkerTaskRunTime (workerNodeKey: number): number {
+ protected getWorkerNodeTaskRunTime (workerNodeKey: number): number {
return this.taskStatisticsRequirements.runTime.median
- ? this.pool.workerNodes[workerNodeKey].usage.runTime?.median ?? 0
- : this.pool.workerNodes[workerNodeKey].usage.runTime?.average ?? 0
+ ? this.pool.workerNodes[workerNodeKey].usage.runTime.median ?? 0
+ : this.pool.workerNodes[workerNodeKey].usage.runTime.average ?? 0
}
/**
- * Gets the worker task wait time.
+ * Gets the worker node task wait time.
* If the task statistics require the average wait time, the average wait time is returned.
* If the task statistics require the median wait time, the median wait time is returned.
*
* @param workerNodeKey - The worker node key.
- * @returns The worker task wait time.
+ * @returns The worker node task wait time.
*/
- protected getWorkerTaskWaitTime (workerNodeKey: number): number {
+ protected getWorkerNodeTaskWaitTime (workerNodeKey: number): number {
return this.taskStatisticsRequirements.waitTime.median
- ? this.pool.workerNodes[workerNodeKey].usage.waitTime?.median ?? 0
- : this.pool.workerNodes[workerNodeKey].usage.waitTime?.average ?? 0
+ ? this.pool.workerNodes[workerNodeKey].usage.waitTime.median ?? 0
+ : this.pool.workerNodes[workerNodeKey].usage.waitTime.average ?? 0
}
/**
- * Gets the worker task ELU.
+ * Gets the worker node task ELU.
* If the task statistics require the average ELU, the average ELU is returned.
* If the task statistics require the median ELU, the median ELU is returned.
*
* @param workerNodeKey - The worker node key.
- * @returns The worker task ELU.
+ * @returns The worker node task ELU.
*/
- protected getWorkerTaskElu (workerNodeKey: number): number {
+ protected getWorkerNodeTaskElu (workerNodeKey: number): number {
return this.taskStatisticsRequirements.elu.median
- ? this.pool.workerNodes[workerNodeKey].usage.elu.active?.median ?? 0
- : this.pool.workerNodes[workerNodeKey].usage.elu.active?.average ?? 0
+ ? this.pool.workerNodes[workerNodeKey].usage.elu.active.median ?? 0
+ : this.pool.workerNodes[workerNodeKey].usage.elu.active.average ?? 0
+ }
+
+ /**
+ * Sets safely the previous worker node key.
+ *
+ * @param workerNodeKey - The worker node key.
+ */
+ protected setPreviousWorkerNodeKey (workerNodeKey: number | undefined): void {
+ this.previousWorkerNodeKey = workerNodeKey ?? this.previousWorkerNodeKey
+ }
+
+ /**
+ * Check the next worker node eligibility.
+ */
+ protected checkNextWorkerNodeEligibility (): void {
+ if (!this.isWorkerNodeEligible(this.nextWorkerNodeKey as number)) {
+ delete this.nextWorkerNodeKey
+ }
}
protected computeDefaultWorkerWeight (): number {