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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 JB |
13 | * @typeParam Worker - Type of worker which manages the strategy. |
14 | * @typeParam Data - Type of data sent to the worker. This can only be serializable data. | |
02706357 | 15 | * @typeParam Response - Type of execution response. This can only be serializable 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 { |
bdaf31cd | 24 | /** |
f06e48d8 | 25 | * Id of the next worker node. |
bdaf31cd | 26 | */ |
f06e48d8 | 27 | private nextWorkerNodeId: number = 0 |
bdaf31cd | 28 | |
2fc5cae3 JB |
29 | /** @inheritDoc */ |
30 | public constructor ( | |
31 | pool: IPool<Worker, Data, Response>, | |
32 | opts: WorkerChoiceStrategyOptions = DEFAULT_WORKER_CHOICE_STRATEGY_OPTIONS | |
33 | ) { | |
34 | super(pool, opts) | |
35 | this.checkOptions(opts) | |
36 | } | |
37 | ||
afc003b2 | 38 | /** @inheritDoc */ |
a6f7f1b4 | 39 | public reset (): boolean { |
f06e48d8 | 40 | this.nextWorkerNodeId = 0 |
ea7a90d3 JB |
41 | return true |
42 | } | |
43 | ||
afc003b2 | 44 | /** @inheritDoc */ |
c923ce56 | 45 | public choose (): number { |
f06e48d8 JB |
46 | const chosenWorkerNodeKey = this.nextWorkerNodeId |
47 | this.nextWorkerNodeId = | |
48 | this.nextWorkerNodeId === this.pool.workerNodes.length - 1 | |
bdaf31cd | 49 | ? 0 |
f06e48d8 JB |
50 | : this.nextWorkerNodeId + 1 |
51 | return chosenWorkerNodeKey | |
bdaf31cd | 52 | } |
97a2abc3 | 53 | |
afc003b2 | 54 | /** @inheritDoc */ |
f06e48d8 JB |
55 | public remove (workerNodeKey: number): boolean { |
56 | if (this.nextWorkerNodeId === workerNodeKey) { | |
57 | if (this.pool.workerNodes.length === 0) { | |
58 | this.nextWorkerNodeId = 0 | |
78ab2555 | 59 | } else { |
f06e48d8 JB |
60 | this.nextWorkerNodeId = |
61 | this.nextWorkerNodeId > this.pool.workerNodes.length - 1 | |
62 | ? this.pool.workerNodes.length - 1 | |
63 | : this.nextWorkerNodeId | |
78ab2555 | 64 | } |
97a2abc3 JB |
65 | } |
66 | return true | |
67 | } | |
bdaf31cd | 68 | } |