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bdaf31cd JB |
1 | import type { AbstractPoolWorker } from '../abstract-pool-worker' |
2 | import type { IPoolInternal } from '../pool-internal' | |
3 | import { PoolType } from '../pool-internal' | |
4 | import { DynamicPoolWorkerChoiceStrategy } from './dynamic-pool-worker-choice-strategy' | |
5 | import type { | |
6 | IWorkerChoiceStrategy, | |
7 | WorkerChoiceStrategy | |
8 | } from './selection-strategies-types' | |
9 | import { WorkerChoiceStrategies } from './selection-strategies-types' | |
10 | import { SelectionStrategiesUtils } from './selection-strategies-utils' | |
11 | ||
12 | /** | |
13 | * The worker choice strategy context. | |
14 | * | |
15 | * @template Worker Type of worker. | |
16 | * @template Data Type of data sent to the worker. This can only be serializable data. | |
17 | * @template Response Type of response of execution. This can only be serializable data. | |
18 | */ | |
19 | export class WorkerChoiceStrategyContext< | |
20 | Worker extends AbstractPoolWorker, | |
21 | Data, | |
22 | Response | |
23 | > { | |
bdaf31cd JB |
24 | private workerChoiceStrategy!: IWorkerChoiceStrategy<Worker> |
25 | ||
26 | /** | |
27 | * Worker choice strategy context constructor. | |
28 | * | |
29 | * @param pool The pool instance. | |
30 | * @param createDynamicallyWorkerCallback The worker creation callback for dynamic pool. | |
31 | * @param workerChoiceStrategy The worker choice strategy. | |
32 | */ | |
33 | public constructor ( | |
34 | private readonly pool: IPoolInternal<Worker, Data, Response>, | |
35 | private createDynamicallyWorkerCallback: () => Worker, | |
36 | workerChoiceStrategy: WorkerChoiceStrategy = WorkerChoiceStrategies.ROUND_ROBIN | |
37 | ) { | |
38 | this.setWorkerChoiceStrategy(workerChoiceStrategy) | |
39 | } | |
40 | ||
41 | /** | |
42 | * Get the worker choice strategy instance specific to the pool type. | |
43 | * | |
44 | * @param workerChoiceStrategy The worker choice strategy. | |
45 | * @returns The worker choice strategy instance for the pool type. | |
46 | */ | |
47 | private getPoolWorkerChoiceStrategy ( | |
48 | workerChoiceStrategy: WorkerChoiceStrategy = WorkerChoiceStrategies.ROUND_ROBIN | |
49 | ): IWorkerChoiceStrategy<Worker> { | |
50 | if (this.pool.type === PoolType.DYNAMIC) { | |
51 | return new DynamicPoolWorkerChoiceStrategy( | |
52 | this.pool, | |
53 | this.createDynamicallyWorkerCallback, | |
54 | workerChoiceStrategy | |
55 | ) | |
56 | } | |
57 | return SelectionStrategiesUtils.getWorkerChoiceStrategy( | |
58 | this.pool, | |
59 | workerChoiceStrategy | |
60 | ) | |
61 | } | |
62 | ||
10fcfaf4 JB |
63 | /** |
64 | * Get the worker choice strategy used in the context. | |
65 | * | |
66 | * @returns The worker choice strategy. | |
67 | */ | |
68 | public getWorkerChoiceStrategy (): IWorkerChoiceStrategy<Worker> { | |
69 | return this.workerChoiceStrategy | |
70 | } | |
71 | ||
bdaf31cd JB |
72 | /** |
73 | * Set the worker choice strategy to use in the context. | |
74 | * | |
75 | * @param workerChoiceStrategy The worker choice strategy to set. | |
76 | */ | |
77 | public setWorkerChoiceStrategy ( | |
78 | workerChoiceStrategy: WorkerChoiceStrategy | |
79 | ): void { | |
80 | this.workerChoiceStrategy = this.getPoolWorkerChoiceStrategy( | |
81 | workerChoiceStrategy | |
82 | ) | |
83 | } | |
84 | ||
85 | /** | |
86 | * Choose a worker with the underlying selection strategy. | |
87 | * | |
88 | * @returns The chosen one. | |
89 | */ | |
90 | public execute (): Worker { | |
91 | return this.workerChoiceStrategy.choose() | |
92 | } | |
93 | } |