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ea7a90d3 | 1 | import type { IPoolWorker } from '../pool-worker' |
23ff945a | 2 | import { AbstractWorkerChoiceStrategy } from './abstract-worker-choice-strategy' |
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3 | import type { |
4 | IWorkerChoiceStrategy, | |
5 | RequiredStatistics | |
6 | } from './selection-strategies-types' | |
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7 | |
8 | /** | |
9 | * Worker virtual task timestamp. | |
10 | */ | |
78cea37e | 11 | interface WorkerVirtualTaskTimestamp { |
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12 | start: number |
13 | end: number | |
14 | } | |
15 | ||
16 | /** | |
17 | * Selects the next worker with a fair share scheduling algorithm. | |
18 | * Loosely modeled after the fair queueing algorithm: https://en.wikipedia.org/wiki/Fair_queuing. | |
19 | * | |
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20 | * @typeParam Worker - Type of worker which manages the strategy. |
21 | * @typeParam Data - Type of data sent to the worker. This can only be serializable data. | |
22 | * @typeParam Response - Type of response of execution. This can only be serializable data. | |
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23 | */ |
24 | export class FairShareWorkerChoiceStrategy< | |
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25 | Worker extends IPoolWorker, |
26 | Data, | |
27 | Response | |
28 | > | |
29 | extends AbstractWorkerChoiceStrategy<Worker, Data, Response> | |
30 | implements IWorkerChoiceStrategy { | |
38e795c1 | 31 | /** {@inheritDoc} */ |
ea7a90d3 | 32 | public readonly requiredStatistics: RequiredStatistics = { |
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33 | runTime: true |
34 | } | |
35 | ||
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36 | /** |
37 | * Worker last virtual task execution timestamp. | |
38 | */ | |
ea7a90d3 | 39 | private readonly workerLastVirtualTaskTimestamp: Map< |
c923ce56 | 40 | number, |
78cea37e | 41 | WorkerVirtualTaskTimestamp |
c923ce56 | 42 | > = new Map<number, WorkerVirtualTaskTimestamp>() |
23ff945a | 43 | |
38e795c1 | 44 | /** {@inheritDoc} */ |
a6f7f1b4 | 45 | public reset (): boolean { |
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46 | this.workerLastVirtualTaskTimestamp.clear() |
47 | return true | |
48 | } | |
49 | ||
38e795c1 | 50 | /** {@inheritDoc} */ |
c923ce56 | 51 | public choose (): number { |
23ff945a | 52 | let minWorkerVirtualTaskEndTimestamp = Infinity |
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53 | let chosenWorkerKey!: number |
54 | for (const [index] of this.pool.workers.entries()) { | |
55 | this.computeWorkerLastVirtualTaskTimestamp(index) | |
23ff945a | 56 | const workerLastVirtualTaskEndTimestamp = |
c923ce56 | 57 | this.workerLastVirtualTaskTimestamp.get(index)?.end ?? 0 |
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58 | if ( |
59 | workerLastVirtualTaskEndTimestamp < minWorkerVirtualTaskEndTimestamp | |
60 | ) { | |
61 | minWorkerVirtualTaskEndTimestamp = workerLastVirtualTaskEndTimestamp | |
c923ce56 | 62 | chosenWorkerKey = index |
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63 | } |
64 | } | |
c923ce56 | 65 | return chosenWorkerKey |
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66 | } |
67 | ||
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68 | /** {@inheritDoc} */ |
69 | public remove (workerKey: number): boolean { | |
70 | const workerDeleted = this.workerLastVirtualTaskTimestamp.delete(workerKey) | |
71 | for (const [key, value] of this.workerLastVirtualTaskTimestamp.entries()) { | |
72 | if (key > workerKey) { | |
73 | this.workerLastVirtualTaskTimestamp.set(key - 1, value) | |
74 | } | |
75 | } | |
76 | return workerDeleted | |
77 | } | |
78 | ||
23ff945a | 79 | /** |
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80 | * Computes worker last virtual task timestamp. |
81 | * | |
c923ce56 | 82 | * @param workerKey - The worker key. |
23ff945a | 83 | */ |
c923ce56 | 84 | private computeWorkerLastVirtualTaskTimestamp (workerKey: number): void { |
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85 | const workerVirtualTaskStartTimestamp = Math.max( |
86 | Date.now(), | |
c923ce56 | 87 | this.workerLastVirtualTaskTimestamp.get(workerKey)?.end ?? -Infinity |
11df3590 | 88 | ) |
c923ce56 | 89 | this.workerLastVirtualTaskTimestamp.set(workerKey, { |
11df3590 | 90 | start: workerVirtualTaskStartTimestamp, |
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91 | end: |
92 | workerVirtualTaskStartTimestamp + | |
c923ce56 | 93 | (this.pool.workers[workerKey].tasksUsage.avgRunTime ?? 0) |
11df3590 | 94 | }) |
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95 | } |
96 | } |