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bdaf31cd | 1 | import type { IPoolInternal } from '../pool-internal' |
ea7a90d3 | 2 | import type { IPoolWorker } from '../pool-worker' |
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3 | import type { |
4 | IWorkerChoiceStrategy, | |
97a2abc3 | 5 | RequiredStatistics, |
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6 | WorkerChoiceStrategy |
7 | } from './selection-strategies-types' | |
8 | import { WorkerChoiceStrategies } from './selection-strategies-types' | |
78cea37e | 9 | import { getWorkerChoiceStrategy } from './selection-strategies-utils' |
bdaf31cd JB |
10 | |
11 | /** | |
12 | * The worker choice strategy context. | |
13 | * | |
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14 | * @typeParam Worker - Type of worker. |
15 | * @typeParam Data - Type of data sent to the worker. This can only be serializable data. | |
16 | * @typeParam Response - Type of response of execution. This can only be serializable data. | |
bdaf31cd JB |
17 | */ |
18 | export class WorkerChoiceStrategyContext< | |
ea7a90d3 | 19 | Worker extends IPoolWorker, |
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20 | Data, |
21 | Response | |
22 | > { | |
3300e7bc | 23 | private workerChoiceStrategy: IWorkerChoiceStrategy<Worker, Data, Response> |
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24 | |
25 | /** | |
26 | * Worker choice strategy context constructor. | |
27 | * | |
38e795c1 | 28 | * @param pool - The pool instance. |
c923ce56 | 29 | * @param createWorkerCallback - The worker creation callback for dynamic pool. |
38e795c1 | 30 | * @param workerChoiceStrategy - The worker choice strategy. |
bdaf31cd JB |
31 | */ |
32 | public constructor ( | |
3300e7bc | 33 | pool: IPoolInternal<Worker, Data, Response>, |
c923ce56 | 34 | private readonly createWorkerCallback: () => number, |
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35 | workerChoiceStrategy: WorkerChoiceStrategy = WorkerChoiceStrategies.ROUND_ROBIN |
36 | ) { | |
1086026a | 37 | this.execute.bind(this) |
3300e7bc JB |
38 | this.workerChoiceStrategy = getWorkerChoiceStrategy<Worker, Data, Response>( |
39 | pool, | |
40 | workerChoiceStrategy | |
41 | ) | |
bdaf31cd JB |
42 | } |
43 | ||
97a2abc3 JB |
44 | /** |
45 | * Gets the worker choice strategy required statistics. | |
46 | * | |
47 | * @returns The required statistics. | |
48 | */ | |
49 | public getRequiredStatistics (): RequiredStatistics { | |
50 | return this.workerChoiceStrategy.requiredStatistics | |
51 | } | |
52 | ||
bdaf31cd | 53 | /** |
bdede008 | 54 | * Sets the worker choice strategy to use in the context. |
bdaf31cd | 55 | * |
38e795c1 | 56 | * @param workerChoiceStrategy - The worker choice strategy to set. |
bdaf31cd JB |
57 | */ |
58 | public setWorkerChoiceStrategy ( | |
3300e7bc | 59 | pool: IPoolInternal<Worker, Data, Response>, |
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60 | workerChoiceStrategy: WorkerChoiceStrategy |
61 | ): void { | |
a6f7f1b4 | 62 | this.workerChoiceStrategy?.reset() |
d59df138 | 63 | this.workerChoiceStrategy = getWorkerChoiceStrategy<Worker, Data, Response>( |
3300e7bc | 64 | pool, |
9cd39dd4 JB |
65 | workerChoiceStrategy |
66 | ) | |
bdaf31cd JB |
67 | } |
68 | ||
69 | /** | |
9cd39dd4 | 70 | * Chooses a worker with the worker choice strategy. |
bdaf31cd | 71 | * |
c923ce56 | 72 | * @returns The key of the chosen one. |
bdaf31cd | 73 | */ |
c923ce56 | 74 | public execute (): number { |
9cd39dd4 | 75 | if ( |
ccd49f03 | 76 | this.workerChoiceStrategy.isDynamicPool && |
3300e7bc JB |
77 | !this.workerChoiceStrategy.pool.full && |
78 | this.workerChoiceStrategy.pool.findFreeWorkerKey() === -1 | |
9cd39dd4 JB |
79 | ) { |
80 | return this.createWorkerCallback() | |
81 | } | |
bdaf31cd JB |
82 | return this.workerChoiceStrategy.choose() |
83 | } | |
97a2abc3 JB |
84 | |
85 | /** | |
9cd39dd4 | 86 | * Removes a worker in the worker choice strategy internals. |
97a2abc3 JB |
87 | * |
88 | * @param workerKey - The key of the worker to remove. | |
89 | * @returns `true` if the removal is successful, `false` otherwise. | |
90 | */ | |
91 | public remove (workerKey: number): boolean { | |
92 | return this.workerChoiceStrategy.remove(workerKey) | |
93 | } | |
bdaf31cd | 94 | } |