+import { DEFAULT_WORKER_CHOICE_STRATEGY_OPTIONS } from '../../utils'
+import type { IPool } from '../pool'
import type { IWorker } from '../worker'
import { AbstractWorkerChoiceStrategy } from './abstract-worker-choice-strategy'
import type {
IWorkerChoiceStrategy,
- RequiredStatistics
+ RequiredStatistics,
+ WorkerChoiceStrategyOptions
} from './selection-strategies-types'
-/**
- * Worker virtual task timestamp.
- */
-interface WorkerVirtualTaskTimestamp {
- start: number
- end: number
-}
-
/**
* Selects the next worker with a fair share scheduling algorithm.
* Loosely modeled after the fair queueing algorithm: https://en.wikipedia.org/wiki/Fair_queuing.
}
/**
- * Worker last virtual task execution timestamp.
+ * Workers' virtual task end execution timestamp.
*/
- private readonly workerLastVirtualTaskTimestamp: Map<
- number,
- WorkerVirtualTaskTimestamp
- > = new Map<number, WorkerVirtualTaskTimestamp>()
+ private workersVirtualTaskEndTimestamp: number[] = []
+
+ /** @inheritDoc */
+ public constructor (
+ pool: IPool<Worker, Data, Response>,
+ opts: WorkerChoiceStrategyOptions = DEFAULT_WORKER_CHOICE_STRATEGY_OPTIONS
+ ) {
+ super(pool, opts)
+ this.checkOptions(this.opts)
+ }
/** @inheritDoc */
public reset (): boolean {
- this.workerLastVirtualTaskTimestamp.clear()
+ this.workersVirtualTaskEndTimestamp = []
+ return true
+ }
+
+ /** @inheritDoc */
+ public update (workerNodeKey: number): boolean {
+ this.computeWorkerVirtualTaskEndTimestamp(workerNodeKey)
return true
}
public choose (): number {
let minWorkerVirtualTaskEndTimestamp = Infinity
let chosenWorkerNodeKey!: number
- for (const [index] of this.pool.workerNodes.entries()) {
- this.computeWorkerLastVirtualTaskTimestamp(index)
- const workerLastVirtualTaskEndTimestamp =
- this.workerLastVirtualTaskTimestamp.get(index)?.end ?? 0
- if (
- workerLastVirtualTaskEndTimestamp < minWorkerVirtualTaskEndTimestamp
- ) {
- minWorkerVirtualTaskEndTimestamp = workerLastVirtualTaskEndTimestamp
- chosenWorkerNodeKey = index
+ for (const [workerNodeKey] of this.pool.workerNodes.entries()) {
+ if (this.workersVirtualTaskEndTimestamp[workerNodeKey] == null) {
+ this.computeWorkerVirtualTaskEndTimestamp(workerNodeKey)
+ }
+ const workerVirtualTaskEndTimestamp =
+ this.workersVirtualTaskEndTimestamp[workerNodeKey]
+ if (workerVirtualTaskEndTimestamp < minWorkerVirtualTaskEndTimestamp) {
+ minWorkerVirtualTaskEndTimestamp = workerVirtualTaskEndTimestamp
+ chosenWorkerNodeKey = workerNodeKey
}
}
return chosenWorkerNodeKey
/** @inheritDoc */
public remove (workerNodeKey: number): boolean {
- const deleted = this.workerLastVirtualTaskTimestamp.delete(workerNodeKey)
- for (const [key, value] of this.workerLastVirtualTaskTimestamp.entries()) {
- if (key > workerNodeKey) {
- this.workerLastVirtualTaskTimestamp.set(key - 1, value)
- }
- }
- return deleted
+ this.workersVirtualTaskEndTimestamp.splice(workerNodeKey, 1)
+ return true
}
/**
- * Computes worker last virtual task timestamp.
+ * Computes the worker node key virtual task end timestamp.
*
* @param workerNodeKey - The worker node key.
*/
- private computeWorkerLastVirtualTaskTimestamp (workerNodeKey: number): void {
- const workerVirtualTaskStartTimestamp = Math.max(
- performance.now(),
- this.workerLastVirtualTaskTimestamp.get(workerNodeKey)?.end ?? -Infinity
- )
- const workerVirtualTaskTRunTime = this.requiredStatistics.medRunTime
+ private computeWorkerVirtualTaskEndTimestamp (workerNodeKey: number): void {
+ this.workersVirtualTaskEndTimestamp[workerNodeKey] =
+ this.getWorkerVirtualTaskEndTimestamp(
+ workerNodeKey,
+ this.getWorkerVirtualTaskStartTimestamp(workerNodeKey)
+ )
+ }
+
+ private getWorkerVirtualTaskEndTimestamp (
+ workerNodeKey: number,
+ workerVirtualTaskStartTimestamp: number
+ ): number {
+ const workerVirtualTaskRunTime = this.requiredStatistics.medRunTime
? this.pool.workerNodes[workerNodeKey].tasksUsage.medRunTime
: this.pool.workerNodes[workerNodeKey].tasksUsage.avgRunTime
- this.workerLastVirtualTaskTimestamp.set(workerNodeKey, {
- start: workerVirtualTaskStartTimestamp,
- end: workerVirtualTaskStartTimestamp + (workerVirtualTaskTRunTime ?? 0)
- })
+ return workerVirtualTaskStartTimestamp + workerVirtualTaskRunTime
+ }
+
+ private getWorkerVirtualTaskStartTimestamp (workerNodeKey: number): number {
+ return Math.max(
+ performance.now(),
+ this.workersVirtualTaskEndTimestamp[workerNodeKey] ?? -Infinity
+ )
}
}