import type { IPoolInternal } from '../pool-internal'
import type { IPoolWorker } from '../pool-worker'
+import { FairShareWorkerChoiceStrategy } from './fair-share-worker-choice-strategy'
+import { LessBusyWorkerChoiceStrategy } from './less-busy-worker-choice-strategy'
+import { LessUsedWorkerChoiceStrategy } from './less-used-worker-choice-strategy'
+import { RoundRobinWorkerChoiceStrategy } from './round-robin-worker-choice-strategy'
import type {
IWorkerChoiceStrategy,
RequiredStatistics,
WorkerChoiceStrategy
} from './selection-strategies-types'
import { WorkerChoiceStrategies } from './selection-strategies-types'
-import { getWorkerChoiceStrategy } from './selection-strategies-utils'
+import { WeightedRoundRobinWorkerChoiceStrategy } from './weighted-round-robin-worker-choice-strategy'
/**
* The worker choice strategy context.
Data = unknown,
Response = unknown
> {
- private workerChoiceStrategy: IWorkerChoiceStrategy<Worker, Data, Response>
+ private readonly workerChoiceStrategies: Map<
+ WorkerChoiceStrategy,
+ IWorkerChoiceStrategy
+ >
/**
* Worker choice strategy context constructor.
*
* @param pool - The pool instance.
- * @param createWorkerCallback - The worker creation callback for dynamic pool.
- * @param workerChoiceStrategy - The worker choice strategy.
+ * @param workerChoiceStrategyType - The worker choice strategy.
*/
public constructor (
pool: IPoolInternal<Worker, Data, Response>,
- private readonly createWorkerCallback: () => number,
private workerChoiceStrategyType: WorkerChoiceStrategy = WorkerChoiceStrategies.ROUND_ROBIN
) {
this.execute.bind(this)
- this.workerChoiceStrategy = getWorkerChoiceStrategy<Worker, Data, Response>(
- pool,
- this.workerChoiceStrategyType
- )
+ this.workerChoiceStrategies = new Map<
+ WorkerChoiceStrategy,
+ IWorkerChoiceStrategy
+ >([
+ [
+ WorkerChoiceStrategies.ROUND_ROBIN,
+ new RoundRobinWorkerChoiceStrategy<Worker, Data, Response>(pool)
+ ],
+ [
+ WorkerChoiceStrategies.LESS_USED,
+ new LessUsedWorkerChoiceStrategy<Worker, Data, Response>(pool)
+ ],
+ [
+ WorkerChoiceStrategies.LESS_BUSY,
+ new LessBusyWorkerChoiceStrategy<Worker, Data, Response>(pool)
+ ],
+ [
+ WorkerChoiceStrategies.FAIR_SHARE,
+ new FairShareWorkerChoiceStrategy<Worker, Data, Response>(pool)
+ ],
+ [
+ WorkerChoiceStrategies.WEIGHTED_ROUND_ROBIN,
+ new WeightedRoundRobinWorkerChoiceStrategy<Worker, Data, Response>(pool)
+ ]
+ ])
}
/**
- * Gets the worker choice strategy required statistics.
+ * Gets the worker choice strategy in the context required statistics.
*
* @returns The required statistics.
*/
public getRequiredStatistics (): RequiredStatistics {
- return this.workerChoiceStrategy.requiredStatistics
+ return (
+ this.workerChoiceStrategies.get(
+ this.workerChoiceStrategyType
+ ) as IWorkerChoiceStrategy
+ ).requiredStatistics
}
/**
* @param workerChoiceStrategy - The worker choice strategy to set.
*/
public setWorkerChoiceStrategy (
- pool: IPoolInternal<Worker, Data, Response>,
workerChoiceStrategy: WorkerChoiceStrategy
): void {
- if (this.workerChoiceStrategyType === workerChoiceStrategy) {
- this.workerChoiceStrategy?.reset()
- } else {
+ if (this.workerChoiceStrategyType !== workerChoiceStrategy) {
this.workerChoiceStrategyType = workerChoiceStrategy
- this.workerChoiceStrategy = getWorkerChoiceStrategy<
- Worker,
- Data,
- Response
- >(pool, this.workerChoiceStrategyType)
}
+ this.workerChoiceStrategies.get(this.workerChoiceStrategyType)?.reset()
}
/**
- * Chooses a worker with the worker choice strategy.
+ * Executes the worker choice strategy algorithm in the context.
*
* @returns The key of the chosen one.
*/
public execute (): number {
- if (
- this.workerChoiceStrategy.isDynamicPool &&
- !this.workerChoiceStrategy.pool.full &&
- this.workerChoiceStrategy.pool.findFreeWorkerKey() === -1
- ) {
- return this.createWorkerCallback()
- }
- return this.workerChoiceStrategy.choose()
+ return (
+ this.workerChoiceStrategies.get(
+ this.workerChoiceStrategyType
+ ) as IWorkerChoiceStrategy
+ ).choose()
}
/**
- * Removes a worker in the worker choice strategy internals.
+ * Removes a worker from the worker choice strategy in the context.
*
* @param workerKey - The key of the worker to remove.
* @returns `true` if the removal is successful, `false` otherwise.
*/
public remove (workerKey: number): boolean {
- return this.workerChoiceStrategy.remove(workerKey)
+ return (
+ this.workerChoiceStrategies.get(
+ this.workerChoiceStrategyType
+ ) as IWorkerChoiceStrategy
+ ).remove(workerKey)
}
}