import type { IPoolWorker } from '../pool-worker'
import { AbstractWorkerChoiceStrategy } from './abstract-worker-choice-strategy'
-import type { RequiredStatistics } from './selection-strategies-types'
+import type {
+ IWorkerChoiceStrategy,
+ 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 IPoolWorker,
- Data,
- Response
-> extends AbstractWorkerChoiceStrategy<Worker, Data, Response> {
- /** @inheritDoc */
+ Worker extends IPoolWorker,
+ Data = unknown,
+ Response = unknown
+ >
+ extends AbstractWorkerChoiceStrategy<Worker, Data, Response>
+ implements IWorkerChoiceStrategy<Worker, Data, Response> {
+ /** {@inheritDoc} */
public readonly requiredStatistics: RequiredStatistics = {
- runTime: true
+ runTime: true,
+ avgRunTime: true
}
/**
* Worker last virtual task execution timestamp.
*/
private readonly workerLastVirtualTaskTimestamp: Map<
- Worker,
- WorkerVirtualTaskTimestamp
- > = new Map<Worker, WorkerVirtualTaskTimestamp>()
+ number,
+ WorkerVirtualTaskTimestamp
+ > = new Map<number, WorkerVirtualTaskTimestamp>()
- /** @inheritDoc */
+ /** {@inheritDoc} */
public reset (): boolean {
this.workerLastVirtualTaskTimestamp.clear()
return true
}
- /** @inheritDoc */
- public choose (): Worker {
+ /** {@inheritDoc} */
+ public choose (): number {
let minWorkerVirtualTaskEndTimestamp = Infinity
- let chosenWorker!: Worker
- for (const worker of this.pool.workers) {
- this.computeWorkerLastVirtualTaskTimestamp(worker)
+ let chosenWorkerKey!: number
+ for (const [index] of this.pool.workers.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
+ chosenWorkerKey = index
}
}
- return chosenWorker
+ return chosenWorkerKey
+ }
+
+ /** {@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
}
/**
* Computes worker last virtual task timestamp.
*
- * @param worker The worker.
+ * @param workerKey - The worker key.
*/
- private computeWorkerLastVirtualTaskTimestamp (worker: Worker): void {
+ private computeWorkerLastVirtualTaskTimestamp (workerKey: number): void {
const workerVirtualTaskStartTimestamp = Math.max(
Date.now(),
- this.workerLastVirtualTaskTimestamp.get(worker)?.end ?? -Infinity
+ this.workerLastVirtualTaskTimestamp.get(workerKey)?.end ?? -Infinity
)
- const workerVirtualTaskEndTimestamp =
- workerVirtualTaskStartTimestamp +
- (this.pool.getWorkerAverageTasksRunTime(worker) ?? 0)
- this.workerLastVirtualTaskTimestamp.set(worker, {
+ this.workerLastVirtualTaskTimestamp.set(workerKey, {
start: workerVirtualTaskStartTimestamp,
- end: workerVirtualTaskEndTimestamp
+ end:
+ workerVirtualTaskStartTimestamp +
+ (this.pool.workers[workerKey].tasksUsage.avgRunTime ?? 0)
})
}
}