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2fc5cae3 JB |
1 | import { DEFAULT_WORKER_CHOICE_STRATEGY_OPTIONS } from '../../utils' |
2 | import type { IPool } from '../pool' | |
f06e48d8 | 3 | import type { IWorker } from '../worker' |
bdaf31cd | 4 | import { AbstractWorkerChoiceStrategy } from './abstract-worker-choice-strategy' |
2fc5cae3 JB |
5 | import type { |
6 | IWorkerChoiceStrategy, | |
7 | WorkerChoiceStrategyOptions | |
8 | } from './selection-strategies-types' | |
bdaf31cd JB |
9 | |
10 | /** | |
11 | * Selects the next worker in a round robin fashion. | |
12 | * | |
38e795c1 | 13 | * @typeParam Worker - Type of worker which manages the strategy. |
e102732c JB |
14 | * @typeParam Data - Type of data sent to the worker. This can only be structured-cloneable data. |
15 | * @typeParam Response - Type of execution response. This can only be structured-cloneable data. | |
bdaf31cd JB |
16 | */ |
17 | export class RoundRobinWorkerChoiceStrategy< | |
f06e48d8 | 18 | Worker extends IWorker, |
b2b1d84e JB |
19 | Data = unknown, |
20 | Response = unknown | |
bf90656c JB |
21 | > |
22 | extends AbstractWorkerChoiceStrategy<Worker, Data, Response> | |
17393ac8 | 23 | implements IWorkerChoiceStrategy { |
2fc5cae3 JB |
24 | /** @inheritDoc */ |
25 | public constructor ( | |
26 | pool: IPool<Worker, Data, Response>, | |
27 | opts: WorkerChoiceStrategyOptions = DEFAULT_WORKER_CHOICE_STRATEGY_OPTIONS | |
28 | ) { | |
29 | super(pool, opts) | |
932fc8be | 30 | this.setTaskStatisticsRequirements(this.opts) |
2fc5cae3 JB |
31 | } |
32 | ||
afc003b2 | 33 | /** @inheritDoc */ |
a6f7f1b4 | 34 | public reset (): boolean { |
39a43af7 | 35 | this.resetWorkerNodeKeyProperties() |
ea7a90d3 JB |
36 | return true |
37 | } | |
38 | ||
138d29a8 JB |
39 | /** @inheritDoc */ |
40 | public update (): boolean { | |
41 | return true | |
42 | } | |
43 | ||
afc003b2 | 44 | /** @inheritDoc */ |
b1aae695 | 45 | public choose (): number | undefined { |
9b106837 | 46 | const chosenWorkerNodeKey = this.nextWorkerNodeKey |
b1aae695 | 47 | this.roundRobinNextWorkerNodeKey() |
f06e48d8 | 48 | return chosenWorkerNodeKey |
bdaf31cd | 49 | } |
97a2abc3 | 50 | |
afc003b2 | 51 | /** @inheritDoc */ |
f06e48d8 | 52 | public remove (workerNodeKey: number): boolean { |
9b106837 | 53 | if (this.nextWorkerNodeKey === workerNodeKey) { |
f06e48d8 | 54 | if (this.pool.workerNodes.length === 0) { |
9b106837 JB |
55 | this.nextWorkerNodeKey = 0 |
56 | } else if (this.nextWorkerNodeKey > this.pool.workerNodes.length - 1) { | |
57 | this.nextWorkerNodeKey = this.pool.workerNodes.length - 1 | |
78ab2555 | 58 | } |
97a2abc3 JB |
59 | } |
60 | return true | |
61 | } | |
9b106837 | 62 | |
b1aae695 | 63 | private roundRobinNextWorkerNodeKey (): number | undefined { |
9b106837 JB |
64 | this.nextWorkerNodeKey = |
65 | this.nextWorkerNodeKey === this.pool.workerNodes.length - 1 | |
66 | ? 0 | |
7c7bb289 | 67 | : (this.nextWorkerNodeKey ?? this.previousWorkerNodeKey) + 1 |
20016c79 | 68 | return this.nextWorkerNodeKey |
9b106837 | 69 | } |
bdaf31cd | 70 | } |