-import type { AbstractPoolWorker } from '../abstract-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 { RequiredStatistics } from './selection-strategies-types'
+import type {
+ IWorkerChoiceStrategy,
+ RequiredStatistics,
+ WorkerChoiceStrategyOptions
+} from './selection-strategies-types'
/**
* Worker virtual task timestamp.
*/
-type WorkerVirtualTaskTimestamp = {
+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.
*
- * @template Worker Type of worker which manages the strategy.
- * @template Data Type of data sent to the worker. This can only be serializable data.
- * @template Response Type of response of execution. This can only be serializable data.
+ * @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.
*/
export class FairShareWorkerChoiceStrategy<
- Worker extends AbstractPoolWorker,
- Data,
- Response
-> extends AbstractWorkerChoiceStrategy<Worker, Data, Response> {
+ Worker extends IWorker,
+ Data = unknown,
+ Response = unknown
+ >
+ extends AbstractWorkerChoiceStrategy<Worker, Data, Response>
+ implements IWorkerChoiceStrategy {
/** @inheritDoc */
- public requiredStatistics: RequiredStatistics = {
- runTime: true
+ public readonly requiredStatistics: RequiredStatistics = {
+ runTime: true,
+ avgRunTime: true,
+ medRunTime: false
}
/**
- * Worker last virtual task execution timestamp.
+ * Worker last virtual task execution timestamp.
*/
- private workerLastVirtualTaskTimestamp: Map<
- Worker,
- WorkerVirtualTaskTimestamp
- > = new Map<Worker, WorkerVirtualTaskTimestamp>()
+ private readonly workerLastVirtualTaskTimestamp: Map<
+ number,
+ WorkerVirtualTaskTimestamp
+ > = new Map<number, WorkerVirtualTaskTimestamp>()
/** @inheritDoc */
- public choose (): Worker {
- this.updateWorkerLastVirtualTaskTimestamp()
+ 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()
+ return true
+ }
+
+ /** @inheritDoc */
+ public choose (): number {
let minWorkerVirtualTaskEndTimestamp = Infinity
- let chosenWorker!: Worker
- for (const worker of this.pool.workers) {
+ let chosenWorkerNodeKey!: number
+ for (const [index] of this.pool.workerNodes.entries()) {
+ this.computeWorkerLastVirtualTaskTimestamp(index)
const workerLastVirtualTaskEndTimestamp =
- this.workerLastVirtualTaskTimestamp.get(worker)?.end ?? 0
+ this.workerLastVirtualTaskTimestamp.get(index)?.end ?? 0
if (
workerLastVirtualTaskEndTimestamp < minWorkerVirtualTaskEndTimestamp
) {
minWorkerVirtualTaskEndTimestamp = workerLastVirtualTaskEndTimestamp
- chosenWorker = worker
+ chosenWorkerNodeKey = index
}
}
- return chosenWorker
+ 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
}
/**
- * Computes workers last virtual task timestamp.
+ * Computes worker last virtual task timestamp.
+ *
+ * @param workerNodeKey - The worker node key.
*/
- private updateWorkerLastVirtualTaskTimestamp () {
- for (const worker of this.pool.workers) {
- const workerVirtualTaskStartTimestamp = Math.max(
- Date.now(),
- this.workerLastVirtualTaskTimestamp.get(worker)?.end ?? -Infinity
- )
- const workerVirtualTaskEndTimestamp =
- workerVirtualTaskStartTimestamp +
- (this.pool.getWorkerAverageTasksRunTime(worker) ?? 0)
- this.workerLastVirtualTaskTimestamp.set(worker, {
- start: workerVirtualTaskStartTimestamp,
- end: workerVirtualTaskEndTimestamp
- })
- }
+ private computeWorkerLastVirtualTaskTimestamp (workerNodeKey: number): void {
+ const workerVirtualTaskStartTimestamp = Math.max(
+ performance.now(),
+ this.workerLastVirtualTaskTimestamp.get(workerNodeKey)?.end ?? -Infinity
+ )
+ const workerVirtualTaskTRunTime = 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)
+ })
}
}