| 1 | import type { AbstractPoolWorker } from '../abstract-pool-worker' |
| 2 | import type { IPoolInternal } from '../pool-internal' |
| 3 | import { AbstractWorkerChoiceStrategy } from './abstract-worker-choice-strategy' |
| 4 | import type { |
| 5 | IWorkerChoiceStrategy, |
| 6 | WorkerChoiceStrategy |
| 7 | } from './selection-strategies-types' |
| 8 | import { WorkerChoiceStrategies } from './selection-strategies-types' |
| 9 | import { SelectionStrategiesUtils } from './selection-strategies-utils' |
| 10 | |
| 11 | /** |
| 12 | * Dynamically choose a worker. |
| 13 | * |
| 14 | * @template Worker Type of worker which manages the strategy. |
| 15 | * @template Data Type of data sent to the worker. This can only be serializable data. |
| 16 | * @template Response Type of response of execution. This can only be serializable data. |
| 17 | */ |
| 18 | export class DynamicPoolWorkerChoiceStrategy< |
| 19 | Worker extends AbstractPoolWorker, |
| 20 | Data, |
| 21 | Response |
| 22 | > extends AbstractWorkerChoiceStrategy<Worker, Data, Response> { |
| 23 | private workerChoiceStrategy: IWorkerChoiceStrategy<Worker> |
| 24 | |
| 25 | /** |
| 26 | * Constructs a worker choice strategy for dynamical pool. |
| 27 | * |
| 28 | * @param pool The pool instance. |
| 29 | * @param createDynamicallyWorkerCallback The worker creation callback for dynamic pool. |
| 30 | * @param workerChoiceStrategy The worker choice strategy when the pull is busy. |
| 31 | */ |
| 32 | public constructor ( |
| 33 | pool: IPoolInternal<Worker, Data, Response>, |
| 34 | private createDynamicallyWorkerCallback: () => Worker, |
| 35 | workerChoiceStrategy: WorkerChoiceStrategy = WorkerChoiceStrategies.ROUND_ROBIN |
| 36 | ) { |
| 37 | super(pool) |
| 38 | this.workerChoiceStrategy = SelectionStrategiesUtils.getWorkerChoiceStrategy( |
| 39 | this.pool, |
| 40 | workerChoiceStrategy |
| 41 | ) |
| 42 | } |
| 43 | |
| 44 | /** @inheritdoc */ |
| 45 | public choose (): Worker { |
| 46 | const freeWorker = this.pool.findFreeWorker() |
| 47 | if (freeWorker) { |
| 48 | return freeWorker |
| 49 | } |
| 50 | |
| 51 | if (this.pool.busy) { |
| 52 | return this.workerChoiceStrategy.choose() |
| 53 | } |
| 54 | |
| 55 | // All workers are busy, create a new worker |
| 56 | return this.createDynamicallyWorkerCallback() |
| 57 | } |
| 58 | } |