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ea7a90d3 | 1 | import type { IPoolWorker } from '../pool-worker' |
23ff945a | 2 | import { AbstractWorkerChoiceStrategy } from './abstract-worker-choice-strategy' |
10fcfaf4 | 3 | import type { RequiredStatistics } from './selection-strategies-types' |
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4 | |
5 | /** | |
6 | * Worker virtual task timestamp. | |
7 | */ | |
78cea37e | 8 | interface WorkerVirtualTaskTimestamp { |
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9 | start: number |
10 | end: number | |
11 | } | |
12 | ||
13 | /** | |
14 | * Selects the next worker with a fair share scheduling algorithm. | |
15 | * Loosely modeled after the fair queueing algorithm: https://en.wikipedia.org/wiki/Fair_queuing. | |
16 | * | |
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17 | * @typeParam Worker - Type of worker which manages the strategy. |
18 | * @typeParam Data - Type of data sent to the worker. This can only be serializable data. | |
19 | * @typeParam Response - Type of response of execution. This can only be serializable data. | |
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20 | */ |
21 | export class FairShareWorkerChoiceStrategy< | |
ea7a90d3 | 22 | Worker extends IPoolWorker, |
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23 | Data, |
24 | Response | |
25 | > extends AbstractWorkerChoiceStrategy<Worker, Data, Response> { | |
38e795c1 | 26 | /** {@inheritDoc} */ |
ea7a90d3 | 27 | public readonly requiredStatistics: RequiredStatistics = { |
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28 | runTime: true |
29 | } | |
30 | ||
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31 | /** |
32 | * Worker last virtual task execution timestamp. | |
33 | */ | |
ea7a90d3 | 34 | private readonly workerLastVirtualTaskTimestamp: Map< |
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35 | Worker, |
36 | WorkerVirtualTaskTimestamp | |
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37 | > = new Map<Worker, WorkerVirtualTaskTimestamp>() |
38 | ||
38e795c1 | 39 | /** {@inheritDoc} */ |
a6f7f1b4 | 40 | public reset (): boolean { |
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41 | this.workerLastVirtualTaskTimestamp.clear() |
42 | return true | |
43 | } | |
44 | ||
38e795c1 | 45 | /** {@inheritDoc} */ |
23ff945a | 46 | public choose (): Worker { |
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47 | let minWorkerVirtualTaskEndTimestamp = Infinity |
48 | let chosenWorker!: Worker | |
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49 | for (const value of this.pool.workers.values()) { |
50 | const worker = value.worker | |
11df3590 | 51 | this.computeWorkerLastVirtualTaskTimestamp(worker) |
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52 | const workerLastVirtualTaskEndTimestamp = |
53 | this.workerLastVirtualTaskTimestamp.get(worker)?.end ?? 0 | |
54 | if ( | |
55 | workerLastVirtualTaskEndTimestamp < minWorkerVirtualTaskEndTimestamp | |
56 | ) { | |
57 | minWorkerVirtualTaskEndTimestamp = workerLastVirtualTaskEndTimestamp | |
58 | chosenWorker = worker | |
59 | } | |
60 | } | |
61 | return chosenWorker | |
62 | } | |
63 | ||
64 | /** | |
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65 | * Computes worker last virtual task timestamp. |
66 | * | |
38e795c1 | 67 | * @param worker - The worker. |
23ff945a | 68 | */ |
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69 | private computeWorkerLastVirtualTaskTimestamp (worker: Worker): void { |
70 | const workerVirtualTaskStartTimestamp = Math.max( | |
71 | Date.now(), | |
72 | this.workerLastVirtualTaskTimestamp.get(worker)?.end ?? -Infinity | |
73 | ) | |
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74 | this.workerLastVirtualTaskTimestamp.set(worker, { |
75 | start: workerVirtualTaskStartTimestamp, | |
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76 | end: |
77 | workerVirtualTaskStartTimestamp + | |
78 | (this.pool.getWorkerAverageTasksRunTime(worker) ?? 0) | |
11df3590 | 79 | }) |
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80 | } |
81 | } |