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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 | /** | |
e4543b14 | 11 | * Selects the least used worker. |
bdaf31cd | 12 | * |
38e795c1 | 13 | * @typeParam Worker - Type of worker which manages the strategy. |
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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 | 16 | */ |
e4543b14 | 17 | export class LeastUsedWorkerChoiceStrategy< |
f06e48d8 | 18 | Worker extends IWorker, |
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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 { |
ea7a90d3 JB |
35 | return true |
36 | } | |
37 | ||
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38 | /** @inheritDoc */ |
39 | public update (): boolean { | |
db703c75 JB |
40 | return true |
41 | } | |
42 | ||
43 | /** @inheritDoc */ | |
b1aae695 JB |
44 | public choose (): number | undefined { |
45 | const chosenWorkerNodeKey = this.leastUsedNextWorkerNodeKey() | |
46 | this.assignChosenWorkerNodeKey(chosenWorkerNodeKey) | |
47 | return this.nextWorkerNodeKey | |
9b106837 JB |
48 | } |
49 | ||
50 | /** @inheritDoc */ | |
51 | public remove (): boolean { | |
52 | return true | |
53 | } | |
54 | ||
b1aae695 | 55 | private leastUsedNextWorkerNodeKey (): number | undefined { |
f4ff1ce2 | 56 | let minNumberOfTasks = Infinity |
b1aae695 | 57 | let chosenWorkerNodeKey: number | undefined |
08f3f44c | 58 | for (const [workerNodeKey, workerNode] of this.pool.workerNodes.entries()) { |
465b2940 | 59 | const workerTaskStatistics = workerNode.usage.tasks |
a4e07f72 | 60 | const workerTasks = |
1c6fe997 JB |
61 | workerTaskStatistics.executed + |
62 | workerTaskStatistics.executing + | |
63 | workerTaskStatistics.queued | |
8990357d | 64 | if (this.isWorkerNodeEligible(workerNodeKey) && workerTasks === 0) { |
b1aae695 | 65 | chosenWorkerNodeKey = workerNodeKey |
5ea80606 | 66 | break |
19dbc45b | 67 | } else if ( |
8990357d | 68 | this.isWorkerNodeEligible(workerNodeKey) && |
19dbc45b JB |
69 | workerTasks < minNumberOfTasks |
70 | ) { | |
f4ff1ce2 | 71 | minNumberOfTasks = workerTasks |
b1aae695 | 72 | chosenWorkerNodeKey = workerNodeKey |
bdaf31cd JB |
73 | } |
74 | } | |
b1aae695 | 75 | return chosenWorkerNodeKey |
97a2abc3 | 76 | } |
bdaf31cd | 77 | } |