1 import { DEFAULT_WORKER_CHOICE_STRATEGY_OPTIONS
} from
'../../utils'
2 import type { IPool
} from
'../pool'
3 import type { IWorker
} from
'../worker'
4 import { AbstractWorkerChoiceStrategy
} from
'./abstract-worker-choice-strategy'
7 WorkerChoiceStrategyOptions
8 } from
'./selection-strategies-types'
11 * Selects the least used worker.
13 * @typeParam Worker - Type of worker which manages the strategy.
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.
17 export class LeastUsedWorkerChoiceStrategy
<
18 Worker
extends IWorker
,
22 extends AbstractWorkerChoiceStrategy
<Worker
, Data
, Response
>
23 implements IWorkerChoiceStrategy
{
26 pool
: IPool
<Worker
, Data
, Response
>,
27 opts
: WorkerChoiceStrategyOptions
= DEFAULT_WORKER_CHOICE_STRATEGY_OPTIONS
30 this.setTaskStatisticsRequirements(this.opts
)
34 public reset (): boolean {
39 public update (): boolean {
44 public choose (): number {
45 return this.leastUsedNextWorkerNodeKey()
49 public remove (): boolean {
53 private leastUsedNextWorkerNodeKey (): number {
54 let minNumberOfTasks
= Infinity
55 for (const [workerNodeKey
, workerNode
] of this.pool
.workerNodes
.entries()) {
56 const workerTaskStatistics
= workerNode
.usage
.tasks
58 workerTaskStatistics
.executed
+
59 workerTaskStatistics
.executing
+
60 workerTaskStatistics
.queued
61 if (this.isWorkerNodeReady(workerNodeKey
) && workerTasks
=== 0) {
62 this.nextWorkerNodeKey
= workerNodeKey
65 this.isWorkerNodeReady(workerNodeKey
) &&
66 workerTasks
< minNumberOfTasks
68 minNumberOfTasks
= workerTasks
69 this.nextWorkerNodeKey
= workerNodeKey
72 return this.nextWorkerNodeKey