-import type { IPoolWorker } from '../pool-worker'
-import { AbstractWorkerChoiceStrategy } from './abstract-worker-choice-strategy'
+import type { IPool } from '../pool.js'
+import type { IWorker } from '../worker.js'
+import { AbstractWorkerChoiceStrategy } from './abstract-worker-choice-strategy.js'
+import type {
+ IWorkerChoiceStrategy,
+ WorkerChoiceStrategyOptions,
+} from './selection-strategies-types.js'
/**
* Selects the next worker in a round robin fashion.
- *
* @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 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 RoundRobinWorkerChoiceStrategy<
- Worker extends IPoolWorker,
- Data,
- Response
-> extends AbstractWorkerChoiceStrategy<Worker, Data, Response> {
- /**
- * Id of the next worker.
- */
- private nextWorkerId: number = 0
+ Worker extends IWorker,
+ Data = unknown,
+ Response = unknown
+ >
+ extends AbstractWorkerChoiceStrategy<Worker, Data, Response>
+ implements IWorkerChoiceStrategy {
+ /** @inheritDoc */
+ public constructor (
+ pool: IPool<Worker, Data, Response>,
+ opts?: WorkerChoiceStrategyOptions
+ ) {
+ super(pool, opts)
+ }
- /** {@inheritDoc} */
+ /** @inheritDoc */
public reset (): boolean {
- this.nextWorkerId = 0
+ this.resetWorkerNodeKeyProperties()
+ return true
+ }
+
+ /** @inheritDoc */
+ public update (): boolean {
+ return true
+ }
+
+ /** @inheritDoc */
+ public choose (): number | undefined {
+ const chosenWorkerNodeKey = this.nextWorkerNodeKey
+ this.setPreviousWorkerNodeKey(chosenWorkerNodeKey)
+ this.roundRobinNextWorkerNodeKey()
+ this.checkNextWorkerNodeKey()
+ return chosenWorkerNodeKey
+ }
+
+ /** @inheritDoc */
+ public remove (workerNodeKey: number): boolean {
+ if (this.pool.workerNodes.length === 0) {
+ this.reset()
+ return true
+ }
+ if (
+ this.nextWorkerNodeKey === workerNodeKey &&
+ this.nextWorkerNodeKey > this.pool.workerNodes.length - 1
+ ) {
+ this.nextWorkerNodeKey = this.pool.workerNodes.length - 1
+ }
+ if (
+ this.previousWorkerNodeKey === workerNodeKey &&
+ this.previousWorkerNodeKey > this.pool.workerNodes.length - 1
+ ) {
+ this.previousWorkerNodeKey = this.pool.workerNodes.length - 1
+ }
return true
}
- /** {@inheritDoc} */
- public choose (): Worker {
- const chosenWorker = this.pool.workers[this.nextWorkerId].worker
- this.nextWorkerId =
- this.nextWorkerId === this.pool.workers.length - 1
+ private roundRobinNextWorkerNodeKey (): number | undefined {
+ this.nextWorkerNodeKey =
+ this.nextWorkerNodeKey === this.pool.workerNodes.length - 1
? 0
- : this.nextWorkerId + 1
- return chosenWorker
+ : (this.nextWorkerNodeKey ?? this.previousWorkerNodeKey) + 1
+ return this.nextWorkerNodeKey
}
}