-import type { AbstractPoolWorker } from '../abstract-pool-worker'
+import type { IPoolWorker } from '../pool-worker'
import { AbstractWorkerChoiceStrategy } from './abstract-worker-choice-strategy'
+import type { RequiredStatistics } 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 response of execution. This can only be serializable data.
*/
export class FairShareWorkerChoiceStrategy<
- Worker extends AbstractPoolWorker,
+ Worker extends IPoolWorker,
Data,
Response
> extends AbstractWorkerChoiceStrategy<Worker, Data, Response> {
+ /** {@inheritDoc} */
+ public readonly requiredStatistics: RequiredStatistics = {
+ runTime: true
+ }
+
/**
* Worker last virtual task execution timestamp.
*/
- private workerLastVirtualTaskTimestamp: Map<
- Worker,
- WorkerVirtualTaskTimestamp
+ private readonly workerLastVirtualTaskTimestamp: Map<
+ Worker,
+ WorkerVirtualTaskTimestamp
> = new Map<Worker, WorkerVirtualTaskTimestamp>()
- /** @inheritDoc */
+ /** {@inheritDoc} */
+ public reset (): boolean {
+ this.workerLastVirtualTaskTimestamp.clear()
+ return true
+ }
+
+ /** {@inheritDoc} */
public choose (): Worker {
- this.updateWorkerLastVirtualTaskTimestamp()
let minWorkerVirtualTaskEndTimestamp = Infinity
let chosenWorker!: Worker
for (const worker of this.pool.workers) {
+ this.computeWorkerLastVirtualTaskTimestamp(worker)
const workerLastVirtualTaskEndTimestamp =
this.workerLastVirtualTaskTimestamp.get(worker)?.end ?? 0
if (
}
/**
- * Compute workers last virtual task timestamp.
+ * Computes worker last virtual task timestamp.
+ *
+ * @param worker - The worker.
*/
- private updateWorkerLastVirtualTaskTimestamp () {
- for (const worker of this.pool.workers) {
- const workerVirtualTaskStartTimestamp = Math.max(
- Date.now(),
- this.workerLastVirtualTaskTimestamp.get(worker)?.end ?? 0
- )
- const workerVirtualTaskEndTimestamp =
+ private computeWorkerLastVirtualTaskTimestamp (worker: Worker): void {
+ const workerVirtualTaskStartTimestamp = Math.max(
+ Date.now(),
+ this.workerLastVirtualTaskTimestamp.get(worker)?.end ?? -Infinity
+ )
+ this.workerLastVirtualTaskTimestamp.set(worker, {
+ start: workerVirtualTaskStartTimestamp,
+ end:
workerVirtualTaskStartTimestamp +
(this.pool.getWorkerAverageTasksRunTime(worker) ?? 0)
- this.workerLastVirtualTaskTimestamp.set(worker, {
- start: workerVirtualTaskStartTimestamp,
- end: workerVirtualTaskEndTimestamp
- })
- }
+ })
}
}