import type { IWorker } from '../worker'
import type { IPool } from '../pool'
-import { DEFAULT_WORKER_CHOICE_STRATEGY_OPTIONS } from '../../utils'
+import {
+ DEFAULT_MEASUREMENT_STATISTICS_REQUIREMENTS,
+ DEFAULT_WORKER_CHOICE_STRATEGY_OPTIONS
+} from '../../utils'
import { AbstractWorkerChoiceStrategy } from './abstract-worker-choice-strategy'
import type {
IWorkerChoiceStrategy,
- RequiredStatistics,
+ StrategyPolicy,
+ TaskStatisticsRequirements,
WorkerChoiceStrategyOptions
} from './selection-strategies-types'
* Loosely modeled after the weighted round robin queueing algorithm: https://en.wikipedia.org/wiki/Weighted_round_robin.
*
* @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 execution response. 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 class WeightedRoundRobinWorkerChoiceStrategy<
Worker extends IWorker,
extends AbstractWorkerChoiceStrategy<Worker, Data, Response>
implements IWorkerChoiceStrategy {
/** @inheritDoc */
- public readonly requiredStatistics: RequiredStatistics = {
- runTime: true,
- avgRunTime: true,
- medRunTime: false,
- waitTime: false,
- avgWaitTime: false,
- medWaitTime: false,
- elu: false
+ public readonly strategyPolicy: StrategyPolicy = {
+ useDynamicWorker: true
+ }
+
+ /** @inheritDoc */
+ public readonly taskStatisticsRequirements: TaskStatisticsRequirements = {
+ runTime: {
+ aggregate: true,
+ average: true,
+ median: false
+ },
+ waitTime: DEFAULT_MEASUREMENT_STATISTICS_REQUIREMENTS,
+ elu: DEFAULT_MEASUREMENT_STATISTICS_REQUIREMENTS
}
- /**
- * Worker node id where the current task will be submitted.
- */
- private currentWorkerNodeId: number = 0
/**
* Default worker weight.
*/
opts: WorkerChoiceStrategyOptions = DEFAULT_WORKER_CHOICE_STRATEGY_OPTIONS
) {
super(pool, opts)
- this.setRequiredStatistics(this.opts)
+ this.setTaskStatisticsRequirements(this.opts)
this.defaultWorkerWeight = this.computeDefaultWorkerWeight()
}
/** @inheritDoc */
public reset (): boolean {
- this.currentWorkerNodeId = 0
+ this.nextWorkerNodeKey = 0
this.workerVirtualTaskRunTime = 0
return true
}
/** @inheritDoc */
public choose (): number {
- const chosenWorkerNodeKey = this.currentWorkerNodeId
- const workerVirtualTaskRunTime = this.workerVirtualTaskRunTime
- const workerWeight =
- this.opts.weights?.[chosenWorkerNodeKey] ?? this.defaultWorkerWeight
- if (workerVirtualTaskRunTime < workerWeight) {
- this.workerVirtualTaskRunTime =
- workerVirtualTaskRunTime +
- this.getWorkerTaskRunTime(chosenWorkerNodeKey)
- } else {
- this.currentWorkerNodeId =
- this.currentWorkerNodeId === this.pool.workerNodes.length - 1
- ? 0
- : this.currentWorkerNodeId + 1
- this.workerVirtualTaskRunTime = 0
- }
+ const chosenWorkerNodeKey = this.nextWorkerNodeKey
+ do {
+ this.weightedRoundRobinNextWorkerNodeKey()
+ } while (!this.isWorkerNodeEligible(this.nextWorkerNodeKey))
return chosenWorkerNodeKey
}
/** @inheritDoc */
public remove (workerNodeKey: number): boolean {
- if (this.currentWorkerNodeId === workerNodeKey) {
+ if (this.nextWorkerNodeKey === workerNodeKey) {
if (this.pool.workerNodes.length === 0) {
- this.currentWorkerNodeId = 0
- } else if (this.currentWorkerNodeId > this.pool.workerNodes.length - 1) {
- this.currentWorkerNodeId = this.pool.workerNodes.length - 1
+ this.nextWorkerNodeKey = 0
+ } else if (this.nextWorkerNodeKey > this.pool.workerNodes.length - 1) {
+ this.nextWorkerNodeKey = this.pool.workerNodes.length - 1
}
this.workerVirtualTaskRunTime = 0
}
return true
}
+
+ private weightedRoundRobinNextWorkerNodeKey (): number {
+ const workerVirtualTaskRunTime = this.workerVirtualTaskRunTime
+ const workerWeight =
+ this.opts.weights?.[this.nextWorkerNodeKey] ?? this.defaultWorkerWeight
+ if (workerVirtualTaskRunTime < workerWeight) {
+ this.workerVirtualTaskRunTime =
+ workerVirtualTaskRunTime +
+ this.getWorkerTaskRunTime(this.nextWorkerNodeKey)
+ } else {
+ this.nextWorkerNodeKey =
+ this.nextWorkerNodeKey === this.pool.workerNodes.length - 1
+ ? 0
+ : this.nextWorkerNodeKey + 1
+ this.workerVirtualTaskRunTime = 0
+ }
+ return this.nextWorkerNodeKey
+ }
}