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f06e48d8 | 1 | import type { IWorker } from '../worker' |
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2 | import type { IPool } from '../pool' |
3 | import { DEFAULT_WORKER_CHOICE_STRATEGY_OPTIONS } from '../../utils' | |
b3432a63 | 4 | import { AbstractWorkerChoiceStrategy } from './abstract-worker-choice-strategy' |
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5 | import type { |
6 | IWorkerChoiceStrategy, | |
da309861 JB |
7 | RequiredStatistics, |
8 | WorkerChoiceStrategyOptions | |
bf90656c | 9 | } from './selection-strategies-types' |
b3432a63 | 10 | |
b3432a63 JB |
11 | /** |
12 | * Selects the next worker with a weighted round robin scheduling algorithm. | |
13 | * Loosely modeled after the weighted round robin queueing algorithm: https://en.wikipedia.org/wiki/Weighted_round_robin. | |
14 | * | |
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15 | * @typeParam Worker - Type of worker which manages the strategy. |
16 | * @typeParam Data - Type of data sent to the worker. This can only be serializable data. | |
02706357 | 17 | * @typeParam Response - Type of execution response. This can only be serializable data. |
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18 | */ |
19 | export class WeightedRoundRobinWorkerChoiceStrategy< | |
f06e48d8 | 20 | Worker extends IWorker, |
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21 | Data = unknown, |
22 | Response = unknown | |
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23 | > |
24 | extends AbstractWorkerChoiceStrategy<Worker, Data, Response> | |
17393ac8 | 25 | implements IWorkerChoiceStrategy { |
afc003b2 | 26 | /** @inheritDoc */ |
ea7a90d3 | 27 | public readonly requiredStatistics: RequiredStatistics = { |
c6bd2650 | 28 | runTime: true, |
78099a15 | 29 | avgRunTime: true, |
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30 | medRunTime: false, |
31 | waitTime: false, | |
32 | avgWaitTime: false, | |
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33 | medWaitTime: false, |
34 | elu: false | |
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35 | } |
36 | ||
b3432a63 | 37 | /** |
f06e48d8 | 38 | * Worker node id where the current task will be submitted. |
b3432a63 | 39 | */ |
f06e48d8 | 40 | private currentWorkerNodeId: number = 0 |
b3432a63 JB |
41 | /** |
42 | * Default worker weight. | |
43 | */ | |
777af0ac | 44 | private readonly defaultWorkerWeight: number |
b3432a63 | 45 | /** |
08f3f44c | 46 | * Worker virtual task runtime. |
b3432a63 | 47 | */ |
08f3f44c | 48 | private workerVirtualTaskRunTime: number = 0 |
b3432a63 | 49 | |
2fc5cae3 | 50 | /** @inheritDoc */ |
da309861 | 51 | public constructor ( |
c4855468 | 52 | pool: IPool<Worker, Data, Response>, |
2fc5cae3 | 53 | opts: WorkerChoiceStrategyOptions = DEFAULT_WORKER_CHOICE_STRATEGY_OPTIONS |
da309861 JB |
54 | ) { |
55 | super(pool, opts) | |
49be33fe | 56 | this.setRequiredStatistics(this.opts) |
08f3f44c | 57 | this.defaultWorkerWeight = this.computeDefaultWorkerWeight() |
b3432a63 JB |
58 | } |
59 | ||
afc003b2 | 60 | /** @inheritDoc */ |
a6f7f1b4 | 61 | public reset (): boolean { |
f06e48d8 | 62 | this.currentWorkerNodeId = 0 |
08f3f44c | 63 | this.workerVirtualTaskRunTime = 0 |
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64 | return true |
65 | } | |
66 | ||
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67 | /** @inheritDoc */ |
68 | public update (): boolean { | |
69 | return true | |
70 | } | |
71 | ||
afc003b2 | 72 | /** @inheritDoc */ |
c923ce56 | 73 | public choose (): number { |
f06e48d8 | 74 | const chosenWorkerNodeKey = this.currentWorkerNodeId |
138d29a8 JB |
75 | const workerVirtualTaskRunTime = this.workerVirtualTaskRunTime |
76 | const workerWeight = | |
08f3f44c | 77 | this.opts.weights?.[chosenWorkerNodeKey] ?? this.defaultWorkerWeight |
138d29a8 | 78 | if (workerVirtualTaskRunTime < workerWeight) { |
08f3f44c | 79 | this.workerVirtualTaskRunTime = |
0d80593b | 80 | workerVirtualTaskRunTime + |
f6b641d6 | 81 | this.getWorkerTaskRunTime(chosenWorkerNodeKey) |
b3432a63 | 82 | } else { |
f06e48d8 JB |
83 | this.currentWorkerNodeId = |
84 | this.currentWorkerNodeId === this.pool.workerNodes.length - 1 | |
b3432a63 | 85 | ? 0 |
f06e48d8 | 86 | : this.currentWorkerNodeId + 1 |
08f3f44c | 87 | this.workerVirtualTaskRunTime = 0 |
b3432a63 | 88 | } |
f06e48d8 | 89 | return chosenWorkerNodeKey |
b3432a63 JB |
90 | } |
91 | ||
afc003b2 | 92 | /** @inheritDoc */ |
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93 | public remove (workerNodeKey: number): boolean { |
94 | if (this.currentWorkerNodeId === workerNodeKey) { | |
95 | if (this.pool.workerNodes.length === 0) { | |
96 | this.currentWorkerNodeId = 0 | |
97f4fd90 JB |
97 | } else if (this.currentWorkerNodeId > this.pool.workerNodes.length - 1) { |
98 | this.currentWorkerNodeId = this.pool.workerNodes.length - 1 | |
78ab2555 | 99 | } |
08f3f44c | 100 | this.workerVirtualTaskRunTime = 0 |
97a2abc3 | 101 | } |
08f3f44c | 102 | return true |
2377984d | 103 | } |
b3432a63 | 104 | } |