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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' |
23ff945a JB |
4 | |
5 | /** | |
6 | * Worker virtual task timestamp. | |
7 | */ | |
8 | type WorkerVirtualTaskTimestamp = { | |
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 | * | |
17 | * @template Worker Type of worker which manages the strategy. | |
18 | * @template Data Type of data sent to the worker. This can only be serializable data. | |
19 | * @template Response Type of response of execution. This can only be serializable data. | |
20 | */ | |
21 | export class FairShareWorkerChoiceStrategy< | |
ea7a90d3 | 22 | Worker extends IPoolWorker, |
23ff945a JB |
23 | Data, |
24 | Response | |
25 | > extends AbstractWorkerChoiceStrategy<Worker, Data, Response> { | |
10fcfaf4 | 26 | /** @inheritDoc */ |
ea7a90d3 | 27 | public readonly requiredStatistics: RequiredStatistics = { |
10fcfaf4 JB |
28 | runTime: true |
29 | } | |
30 | ||
23ff945a JB |
31 | /** |
32 | * Worker last virtual task execution timestamp. | |
33 | */ | |
ea7a90d3 | 34 | private readonly workerLastVirtualTaskTimestamp: Map< |
23ff945a JB |
35 | Worker, |
36 | WorkerVirtualTaskTimestamp | |
37 | > = new Map<Worker, WorkerVirtualTaskTimestamp>() | |
38 | ||
ea7a90d3 | 39 | /** @inheritDoc */ |
a6f7f1b4 | 40 | public reset (): boolean { |
ea7a90d3 JB |
41 | this.workerLastVirtualTaskTimestamp.clear() |
42 | return true | |
43 | } | |
44 | ||
23ff945a JB |
45 | /** @inheritDoc */ |
46 | public choose (): Worker { | |
23ff945a JB |
47 | let minWorkerVirtualTaskEndTimestamp = Infinity |
48 | let chosenWorker!: Worker | |
49 | for (const worker of this.pool.workers) { | |
11df3590 | 50 | this.computeWorkerLastVirtualTaskTimestamp(worker) |
23ff945a JB |
51 | const workerLastVirtualTaskEndTimestamp = |
52 | this.workerLastVirtualTaskTimestamp.get(worker)?.end ?? 0 | |
53 | if ( | |
54 | workerLastVirtualTaskEndTimestamp < minWorkerVirtualTaskEndTimestamp | |
55 | ) { | |
56 | minWorkerVirtualTaskEndTimestamp = workerLastVirtualTaskEndTimestamp | |
57 | chosenWorker = worker | |
58 | } | |
59 | } | |
60 | return chosenWorker | |
61 | } | |
62 | ||
63 | /** | |
11df3590 JB |
64 | * Computes worker last virtual task timestamp. |
65 | * | |
66 | * @param worker The worker. | |
23ff945a | 67 | */ |
11df3590 JB |
68 | private computeWorkerLastVirtualTaskTimestamp (worker: Worker): void { |
69 | const workerVirtualTaskStartTimestamp = Math.max( | |
70 | Date.now(), | |
71 | this.workerLastVirtualTaskTimestamp.get(worker)?.end ?? -Infinity | |
72 | ) | |
11df3590 JB |
73 | this.workerLastVirtualTaskTimestamp.set(worker, { |
74 | start: workerVirtualTaskStartTimestamp, | |
61d849ff JB |
75 | end: |
76 | workerVirtualTaskStartTimestamp + | |
77 | (this.pool.getWorkerAverageTasksRunTime(worker) ?? 0) | |
11df3590 | 78 | }) |
23ff945a JB |
79 | } |
80 | } |