-import type { IPoolInternal } from '../pool-internal'
-import { PoolType } from '../pool-internal'
-import type { IPoolWorker } from '../pool-worker'
+import { cpus } from 'node:os'
+import {
+ DEFAULT_MEASUREMENT_STATISTICS_REQUIREMENTS,
+ DEFAULT_WORKER_CHOICE_STRATEGY_OPTIONS
+} from '../../utils'
+import type { IPool } from '../pool'
+import type { IWorker } from '../worker'
import type {
IWorkerChoiceStrategy,
- RequiredStatistics
+ MeasurementStatisticsRequirements,
+ StrategyPolicy,
+ TaskStatisticsRequirements,
+ WorkerChoiceStrategyOptions
} from './selection-strategies-types'
/**
* Worker choice strategy abstract base class.
*
* @typeParam Worker - Type of worker which manages the strategy.
- * @typeParam Data - Type of data sent to the worker. This can only be serializable data.
- * @typeParam Response - Type of response of execution. This can only be serializable data.
+ * @typeParam Data - Type of data sent to the worker. This can only be structured-cloneable data.
+ * @typeParam Response - Type of execution response. This can only be structured-cloneable data.
*/
export abstract class AbstractWorkerChoiceStrategy<
- Worker extends IPoolWorker,
+ Worker extends IWorker,
Data = unknown,
Response = unknown
-> implements IWorkerChoiceStrategy<Worker, Data, Response> {
- /** {@inheritDoc} */
- public readonly isDynamicPool: boolean
- /** {@inheritDoc} */
- public requiredStatistics: RequiredStatistics = {
- runTime: false,
- avgRunTime: false
+> implements IWorkerChoiceStrategy {
+ /**
+ * The next worker node key.
+ */
+ protected nextWorkerNodeKey: number | undefined = 0
+
+ /**
+ * The previous worker node key.
+ */
+ protected previousWorkerNodeKey: number = 0
+
+ /** @inheritDoc */
+ public readonly strategyPolicy: StrategyPolicy = {
+ dynamicWorkerUsage: false,
+ dynamicWorkerReady: true
+ }
+
+ /** @inheritDoc */
+ public readonly taskStatisticsRequirements: TaskStatisticsRequirements = {
+ runTime: DEFAULT_MEASUREMENT_STATISTICS_REQUIREMENTS,
+ waitTime: DEFAULT_MEASUREMENT_STATISTICS_REQUIREMENTS,
+ elu: DEFAULT_MEASUREMENT_STATISTICS_REQUIREMENTS
}
/**
* Constructs a worker choice strategy bound to the pool.
*
* @param pool - The pool instance.
+ * @param opts - The worker choice strategy options.
*/
public constructor (
- public readonly pool: IPoolInternal<Worker, Data, Response>
+ protected readonly pool: IPool<Worker, Data, Response>,
+ protected opts: WorkerChoiceStrategyOptions = DEFAULT_WORKER_CHOICE_STRATEGY_OPTIONS
) {
- this.isDynamicPool = this.pool.type === PoolType.DYNAMIC
- this.choose.bind(this)
+ this.opts = { ...DEFAULT_WORKER_CHOICE_STRATEGY_OPTIONS, ...opts }
+ this.choose = this.choose.bind(this)
+ }
+
+ protected setTaskStatisticsRequirements (
+ opts: WorkerChoiceStrategyOptions
+ ): void {
+ this.toggleMedianMeasurementStatisticsRequirements(
+ this.taskStatisticsRequirements.runTime,
+ opts.runTime?.median as boolean
+ )
+ this.toggleMedianMeasurementStatisticsRequirements(
+ this.taskStatisticsRequirements.waitTime,
+ opts.waitTime?.median as boolean
+ )
+ this.toggleMedianMeasurementStatisticsRequirements(
+ this.taskStatisticsRequirements.elu,
+ opts.elu?.median as boolean
+ )
+ }
+
+ private toggleMedianMeasurementStatisticsRequirements (
+ measurementStatisticsRequirements: MeasurementStatisticsRequirements,
+ toggleMedian: boolean
+ ): void {
+ if (measurementStatisticsRequirements.average && toggleMedian) {
+ measurementStatisticsRequirements.average = false
+ measurementStatisticsRequirements.median = toggleMedian
+ }
+ if (measurementStatisticsRequirements.median && !toggleMedian) {
+ measurementStatisticsRequirements.average = true
+ measurementStatisticsRequirements.median = toggleMedian
+ }
}
- /** {@inheritDoc} */
+ protected resetWorkerNodeKeyProperties (): void {
+ this.nextWorkerNodeKey = 0
+ this.previousWorkerNodeKey = 0
+ }
+
+ /** @inheritDoc */
public abstract reset (): boolean
- /** {@inheritDoc} */
- public abstract choose (): number
+ /** @inheritDoc */
+ public abstract update (workerNodeKey: number): boolean
+
+ /** @inheritDoc */
+ public abstract choose (): number | undefined
+
+ /** @inheritDoc */
+ public abstract remove (workerNodeKey: number): boolean
+
+ /** @inheritDoc */
+ public setOptions (opts: WorkerChoiceStrategyOptions): void {
+ this.opts = { ...DEFAULT_WORKER_CHOICE_STRATEGY_OPTIONS, ...opts }
+ this.setTaskStatisticsRequirements(this.opts)
+ }
+
+ /**
+ * Whether the worker node is ready or not.
+ *
+ * @param workerNodeKey - The worker node key.
+ * @returns Whether the worker node is ready or not.
+ */
+ protected isWorkerNodeReady (workerNodeKey: number): boolean {
+ return this.pool.workerNodes[workerNodeKey]?.info?.ready ?? false
+ }
+
+ /**
+ * Check the next worker node readiness.
+ */
+ protected checkNextWorkerNodeReadiness (): void {
+ if (!this.isWorkerNodeReady(this.nextWorkerNodeKey as number)) {
+ delete this.nextWorkerNodeKey
+ }
+ }
+
+ /**
+ * 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 node task runtime.
+ */
+ 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
+ }
+
+ /**
+ * 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 node task wait time.
+ */
+ 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
+ }
+
+ /**
+ * 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 node task ELU.
+ */
+ 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
+ }
- /** {@inheritDoc} */
- public abstract remove (workerKey: number): boolean
+ /**
+ * Sets safely the previous worker node key.
+ *
+ * @param workerNodeKey - The worker node key.
+ */
+ protected setPreviousWorkerNodeKey (workerNodeKey: number | undefined): void {
+ this.previousWorkerNodeKey = workerNodeKey ?? this.previousWorkerNodeKey
+ }
+
+ protected computeDefaultWorkerWeight (): number {
+ let cpusCycleTimeWeight = 0
+ for (const cpu of cpus()) {
+ // CPU estimated cycle time
+ const numberOfDigits = cpu.speed.toString().length - 1
+ const cpuCycleTime = 1 / (cpu.speed / Math.pow(10, numberOfDigits))
+ cpusCycleTimeWeight += cpuCycleTime * Math.pow(10, numberOfDigits)
+ }
+ return Math.round(cpusCycleTimeWeight / cpus().length)
+ }
}