-import type { IPoolWorker } from '../pool-worker'
+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.
*
* @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 Response - Type of execution response. This can only be serializable data.
*/
export class FairShareWorkerChoiceStrategy<
- Worker extends IPoolWorker,
- Data,
- Response
+ Worker extends IWorker,
+ Data = unknown,
+ Response = unknown
>
extends AbstractWorkerChoiceStrategy<Worker, Data, Response>
implements IWorkerChoiceStrategy {
- /** {@inheritDoc} */
+ /** @inheritDoc */
public readonly requiredStatistics: RequiredStatistics = {
- runTime: true
+ runTime: true,
+ avgRunTime: true,
+ medRunTime: false
}
/**
- * 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} */
+ /** @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
}
- /** {@inheritDoc} */
+ /** @inheritDoc */
public choose (): number {
let minWorkerVirtualTaskEndTimestamp = Infinity
- let chosenWorkerKey!: number
- for (const [index] of this.pool.workers.entries()) {
- this.computeWorkerLastVirtualTaskTimestamp(index)
- const workerLastVirtualTaskEndTimestamp =
- this.workerLastVirtualTaskTimestamp.get(index)?.end ?? 0
- if (
- workerLastVirtualTaskEndTimestamp < minWorkerVirtualTaskEndTimestamp
- ) {
- minWorkerVirtualTaskEndTimestamp = workerLastVirtualTaskEndTimestamp
- chosenWorkerKey = index
+ let chosenWorkerNodeKey!: number
+ 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 chosenWorkerKey
+ return chosenWorkerNodeKey
}
- /** {@inheritDoc} */
- public remove (workerKey: number): boolean {
- const workerDeleted = this.workerLastVirtualTaskTimestamp.delete(workerKey)
- for (const [key, value] of this.workerLastVirtualTaskTimestamp.entries()) {
- if (key > workerKey) {
- this.workerLastVirtualTaskTimestamp.set(key - 1, value)
- }
- }
- return workerDeleted
+ /** @inheritDoc */
+ public remove (workerNodeKey: number): boolean {
+ this.workersVirtualTaskEndTimestamp.splice(workerNodeKey, 1)
+ return true
}
/**
- * Computes worker last virtual task timestamp.
+ * Computes the worker node key virtual task end timestamp.
*
- * @param workerKey - The worker key.
+ * @param workerNodeKey - The worker node key.
*/
- private computeWorkerLastVirtualTaskTimestamp (workerKey: number): void {
- const workerVirtualTaskStartTimestamp = Math.max(
- Date.now(),
- this.workerLastVirtualTaskTimestamp.get(workerKey)?.end ?? -Infinity
+ 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
+ return workerVirtualTaskStartTimestamp + workerVirtualTaskRunTime
+ }
+
+ private getWorkerVirtualTaskStartTimestamp (workerNodeKey: number): number {
+ return Math.max(
+ performance.now(),
+ this.workersVirtualTaskEndTimestamp[workerNodeKey] ?? -Infinity
)
- this.workerLastVirtualTaskTimestamp.set(workerKey, {
- start: workerVirtualTaskStartTimestamp,
- end:
- workerVirtualTaskStartTimestamp +
- (this.pool.workers[workerKey].tasksUsage.avgRunTime ?? 0)
- })
}
}