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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 | |
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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 */ | |
44 | public choose (): number { | |
f4ff1ce2 | 45 | let minNumberOfTasks = Infinity |
08f3f44c | 46 | for (const [workerNodeKey, workerNode] of this.pool.workerNodes.entries()) { |
465b2940 | 47 | const workerTaskStatistics = workerNode.usage.tasks |
a4e07f72 | 48 | const workerTasks = |
1c6fe997 JB |
49 | workerTaskStatistics.executed + |
50 | workerTaskStatistics.executing + | |
51 | workerTaskStatistics.queued | |
cf9c7b65 | 52 | if (workerTasks === 0) { |
d33be430 | 53 | this.nextWorkerNodeId = workerNodeKey |
5ea80606 | 54 | break |
f4ff1ce2 JB |
55 | } else if (workerTasks < minNumberOfTasks) { |
56 | minNumberOfTasks = workerTasks | |
d33be430 | 57 | this.nextWorkerNodeId = workerNodeKey |
bdaf31cd JB |
58 | } |
59 | } | |
d33be430 | 60 | return this.nextWorkerNodeId |
bdaf31cd | 61 | } |
97a2abc3 | 62 | |
afc003b2 | 63 | /** @inheritDoc */ |
a4958de2 | 64 | public remove (): boolean { |
97a2abc3 JB |
65 | return true |
66 | } | |
bdaf31cd | 67 | } |