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feec6e8c JB |
1 | import type { IWorker } from '../worker' |
2 | import type { IPool } from '../pool' | |
3 | import { DEFAULT_WORKER_CHOICE_STRATEGY_OPTIONS } from '../../utils' | |
4 | import { AbstractWorkerChoiceStrategy } from './abstract-worker-choice-strategy' | |
5 | import type { | |
6 | IWorkerChoiceStrategy, | |
feec6e8c JB |
7 | WorkerChoiceStrategyOptions |
8 | } from './selection-strategies-types' | |
9 | ||
10 | /** | |
11 | * Selects the next worker with an interleaved weighted round robin scheduling algorithm. | |
12 | * | |
13 | * @typeParam Worker - Type of worker which manages the strategy. | |
14 | * @typeParam Data - Type of data sent to the worker. This can only be serializable data. | |
15 | * @typeParam Response - Type of execution response. This can only be serializable data. | |
16 | */ | |
17 | export class InterleavedWeightedRoundRobinWorkerChoiceStrategy< | |
18 | Worker extends IWorker, | |
19 | Data = unknown, | |
20 | Response = unknown | |
21 | > | |
22 | extends AbstractWorkerChoiceStrategy<Worker, Data, Response> | |
23 | implements IWorkerChoiceStrategy { | |
feec6e8c JB |
24 | /** |
25 | * Worker node id where the current task will be submitted. | |
26 | */ | |
27 | private currentWorkerNodeId: number = 0 | |
28 | /** | |
29 | * Current round id. | |
30 | * This is used to determine the current round weight. | |
31 | */ | |
32 | private currentRoundId: number = 0 | |
33 | /** | |
34 | * Round weights. | |
35 | */ | |
e4854a4e | 36 | private roundWeights: number[] |
feec6e8c JB |
37 | /** |
38 | * Default worker weight. | |
39 | */ | |
40 | private readonly defaultWorkerWeight: number | |
41 | ||
42 | /** @inheritDoc */ | |
43 | public constructor ( | |
44 | pool: IPool<Worker, Data, Response>, | |
45 | opts: WorkerChoiceStrategyOptions = DEFAULT_WORKER_CHOICE_STRATEGY_OPTIONS | |
46 | ) { | |
47 | super(pool, opts) | |
b6b32453 | 48 | this.setTaskStatistics(this.opts) |
feec6e8c JB |
49 | this.defaultWorkerWeight = this.computeDefaultWorkerWeight() |
50 | this.roundWeights = this.getRoundWeights() | |
51 | } | |
52 | ||
53 | /** @inheritDoc */ | |
54 | public reset (): boolean { | |
55 | this.currentWorkerNodeId = 0 | |
56 | this.currentRoundId = 0 | |
57 | return true | |
58 | } | |
59 | ||
60 | /** @inheritDoc */ | |
61 | public update (): boolean { | |
62 | return true | |
63 | } | |
64 | ||
65 | /** @inheritDoc */ | |
66 | public choose (): number { | |
297f3bbe JB |
67 | let roundId: number | undefined |
68 | let workerNodeId: number | undefined | |
69 | for ( | |
d3127e84 JB |
70 | let roundIndex = this.currentRoundId; |
71 | roundIndex < this.roundWeights.length; | |
72 | roundIndex++ | |
297f3bbe | 73 | ) { |
feec6e8c | 74 | for ( |
297f3bbe JB |
75 | let workerNodeKey = this.currentWorkerNodeId; |
76 | workerNodeKey < this.pool.workerNodes.length; | |
77 | workerNodeKey++ | |
feec6e8c | 78 | ) { |
297f3bbe JB |
79 | const workerWeight = |
80 | this.opts.weights?.[workerNodeKey] ?? this.defaultWorkerWeight | |
d3127e84 JB |
81 | if (workerWeight >= this.roundWeights[roundIndex]) { |
82 | roundId = roundIndex | |
297f3bbe JB |
83 | workerNodeId = workerNodeKey |
84 | break | |
feec6e8c JB |
85 | } |
86 | } | |
297f3bbe JB |
87 | } |
88 | this.currentRoundId = roundId ?? 0 | |
89 | this.currentWorkerNodeId = workerNodeId ?? 0 | |
90 | const chosenWorkerNodeKey = this.currentWorkerNodeId | |
91 | if (this.currentWorkerNodeId === this.pool.workerNodes.length - 1) { | |
92 | this.currentWorkerNodeId = 0 | |
93 | this.currentRoundId = | |
94 | this.currentRoundId === this.roundWeights.length - 1 | |
95 | ? 0 | |
96 | : this.currentRoundId + 1 | |
97 | } else { | |
98 | this.currentWorkerNodeId = this.currentWorkerNodeId + 1 | |
feec6e8c JB |
99 | } |
100 | return chosenWorkerNodeKey | |
101 | } | |
102 | ||
103 | /** @inheritDoc */ | |
104 | public remove (workerNodeKey: number): boolean { | |
105 | if (this.currentWorkerNodeId === workerNodeKey) { | |
106 | if (this.pool.workerNodes.length === 0) { | |
107 | this.currentWorkerNodeId = 0 | |
cac70359 JB |
108 | } else if (this.currentWorkerNodeId > this.pool.workerNodes.length - 1) { |
109 | this.currentWorkerNodeId = this.pool.workerNodes.length - 1 | |
110 | this.currentRoundId = | |
111 | this.currentRoundId === this.roundWeights.length - 1 | |
112 | ? 0 | |
113 | : this.currentRoundId + 1 | |
feec6e8c JB |
114 | } |
115 | } | |
116 | return true | |
117 | } | |
118 | ||
e4854a4e JB |
119 | /** @inheritDoc */ |
120 | public setOptions (opts: WorkerChoiceStrategyOptions): void { | |
121 | super.setOptions(opts) | |
122 | this.roundWeights = this.getRoundWeights() | |
123 | } | |
124 | ||
feec6e8c JB |
125 | private getRoundWeights (): number[] { |
126 | if (this.opts.weights == null) { | |
127 | return [this.defaultWorkerWeight] | |
128 | } | |
129 | return [ | |
130 | ...new Set( | |
131 | Object.values(this.opts.weights) | |
132 | .slice() | |
133 | .sort((a, b) => a - b) | |
134 | ) | |
135 | ] | |
136 | } | |
137 | } |