2 DEFAULT_MEASUREMENT_STATISTICS_REQUIREMENTS
,
3 DEFAULT_WORKER_CHOICE_STRATEGY_OPTIONS
5 import type { IPool
} from
'../pool'
6 import type { IWorker
} from
'../worker'
7 import { AbstractWorkerChoiceStrategy
} from
'./abstract-worker-choice-strategy'
10 TaskStatisticsRequirements
,
11 WorkerChoiceStrategyOptions
12 } from
'./selection-strategies-types'
15 * Selects the least busy worker.
17 * @typeParam Worker - Type of worker which manages the strategy.
18 * @typeParam Data - Type of data sent to the worker. This can only be structured-cloneable data.
19 * @typeParam Response - Type of execution response. This can only be structured-cloneable data.
21 export class LeastBusyWorkerChoiceStrategy
<
22 Worker
extends IWorker
,
26 extends AbstractWorkerChoiceStrategy
<Worker
, Data
, Response
>
27 implements IWorkerChoiceStrategy
{
29 public readonly taskStatisticsRequirements
: TaskStatisticsRequirements
= {
40 elu
: DEFAULT_MEASUREMENT_STATISTICS_REQUIREMENTS
45 pool
: IPool
<Worker
, Data
, Response
>,
46 opts
: WorkerChoiceStrategyOptions
= DEFAULT_WORKER_CHOICE_STRATEGY_OPTIONS
49 this.setTaskStatisticsRequirements(this.opts
)
53 public reset (): boolean {
58 public update (): boolean {
63 public choose (): number | undefined {
64 this.setPreviousWorkerNodeKey(this.nextWorkerNodeKey
)
65 this.nextWorkerNodeKey
= this.leastBusyNextWorkerNodeKey()
66 return this.nextWorkerNodeKey
70 public remove (): boolean {
74 private leastBusyNextWorkerNodeKey (): number | undefined {
75 return this.pool
.workerNodes
.reduce(
76 (minWorkerNodeKey
, workerNode
, workerNodeKey
, workerNodes
) => {
77 return (workerNode
.usage
.runTime
?.aggregate
?? 0) +
78 (workerNode
.usage
.waitTime
?.aggregate
?? 0) <
79 (workerNodes
[minWorkerNodeKey
].usage
.runTime
?.aggregate
?? 0) +
80 (workerNodes
[minWorkerNodeKey
].usage
.waitTime
?.aggregate
?? 0)