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d35e5717 | 1 | import type { IPool } from '../pool.js' |
e9ed6eee | 2 | import { DEFAULT_MEASUREMENT_STATISTICS_REQUIREMENTS } from '../utils.js' |
ded253e2 | 3 | import type { IWorker } from '../worker.js' |
d35e5717 | 4 | import { AbstractWorkerChoiceStrategy } from './abstract-worker-choice-strategy.js' |
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5 | import type { |
6 | IWorkerChoiceStrategy, | |
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7 | TaskStatisticsRequirements, |
8 | WorkerChoiceStrategyOptions | |
d35e5717 | 9 | } from './selection-strategies-types.js' |
b3432a63 | 10 | |
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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 | * | |
38e795c1 | 15 | * @typeParam Worker - Type of worker which manages the strategy. |
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16 | * @typeParam Data - Type of data sent to the worker. This can only be structured-cloneable data. |
17 | * @typeParam Response - Type of execution response. This can only be structured-cloneable 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 */ |
87de9ff5 | 27 | public readonly taskStatisticsRequirements: TaskStatisticsRequirements = { |
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28 | runTime: { |
29 | aggregate: true, | |
30 | average: true, | |
31 | median: false | |
32 | }, | |
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33 | waitTime: { |
34 | aggregate: true, | |
35 | average: true, | |
36 | median: false | |
37 | }, | |
3c93feb9 | 38 | elu: DEFAULT_MEASUREMENT_STATISTICS_REQUIREMENTS |
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39 | } |
40 | ||
b3432a63 | 41 | /** |
e0843544 | 42 | * Worker node virtual execution time. |
b3432a63 | 43 | */ |
e0843544 | 44 | private workerNodeVirtualTaskExecutionTime = 0 |
b3432a63 | 45 | |
2fc5cae3 | 46 | /** @inheritDoc */ |
da309861 | 47 | public constructor ( |
c4855468 | 48 | pool: IPool<Worker, Data, Response>, |
39618ede | 49 | opts?: WorkerChoiceStrategyOptions |
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50 | ) { |
51 | super(pool, opts) | |
050477bd | 52 | this.setTaskStatisticsRequirements(this.opts) |
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53 | } |
54 | ||
afc003b2 | 55 | /** @inheritDoc */ |
a6f7f1b4 | 56 | public reset (): boolean { |
39a43af7 | 57 | this.resetWorkerNodeKeyProperties() |
e0843544 | 58 | this.workerNodeVirtualTaskExecutionTime = 0 |
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59 | return true |
60 | } | |
61 | ||
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62 | /** @inheritDoc */ |
63 | public update (): boolean { | |
64 | return true | |
65 | } | |
66 | ||
afc003b2 | 67 | /** @inheritDoc */ |
b1aae695 | 68 | public choose (): number | undefined { |
baca80f7 | 69 | this.setPreviousWorkerNodeKey(this.nextWorkerNodeKey) |
a38b62f1 | 70 | this.weightedRoundRobinNextWorkerNodeKey() |
8e8d9101 | 71 | this.checkNextWorkerNodeKey() |
a38b62f1 | 72 | return this.nextWorkerNodeKey |
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73 | } |
74 | ||
afc003b2 | 75 | /** @inheritDoc */ |
f06e48d8 | 76 | public remove (workerNodeKey: number): boolean { |
226b02a3 JB |
77 | if (this.pool.workerNodes.length === 0) { |
78 | this.reset() | |
153179f2 | 79 | return true |
226b02a3 | 80 | } |
9b106837 | 81 | if (this.nextWorkerNodeKey === workerNodeKey) { |
e0843544 | 82 | this.workerNodeVirtualTaskExecutionTime = 0 |
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83 | if (this.nextWorkerNodeKey > this.pool.workerNodes.length - 1) { |
84 | this.nextWorkerNodeKey = this.pool.workerNodes.length - 1 | |
85 | } | |
97a2abc3 | 86 | } |
226b02a3 JB |
87 | if ( |
88 | this.previousWorkerNodeKey === workerNodeKey && | |
89 | this.previousWorkerNodeKey > this.pool.workerNodes.length - 1 | |
90 | ) { | |
91 | this.previousWorkerNodeKey = this.pool.workerNodes.length - 1 | |
92 | } | |
08f3f44c | 93 | return true |
2377984d | 94 | } |
9b106837 | 95 | |
b1aae695 | 96 | private weightedRoundRobinNextWorkerNodeKey (): number | undefined { |
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97 | const workerWeight = |
98 | // eslint-disable-next-line @typescript-eslint/no-non-null-assertion | |
52738541 | 99 | this.opts!.weights![this.nextWorkerNodeKey ?? this.previousWorkerNodeKey] |
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100 | if (this.workerNodeVirtualTaskExecutionTime < workerWeight) { |
101 | this.workerNodeVirtualTaskExecutionTime += | |
102 | this.getWorkerNodeTaskWaitTime( | |
103 | this.nextWorkerNodeKey ?? this.previousWorkerNodeKey | |
104 | ) + | |
a38b62f1 | 105 | this.getWorkerNodeTaskRunTime( |
7c7bb289 | 106 | this.nextWorkerNodeKey ?? this.previousWorkerNodeKey |
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107 | ) |
108 | } else { | |
109 | this.nextWorkerNodeKey = | |
110 | this.nextWorkerNodeKey === this.pool.workerNodes.length - 1 | |
111 | ? 0 | |
112 | : (this.nextWorkerNodeKey ?? this.previousWorkerNodeKey) + 1 | |
e0843544 | 113 | this.workerNodeVirtualTaskExecutionTime = 0 |
a38b62f1 | 114 | } |
20016c79 | 115 | return this.nextWorkerNodeKey |
9b106837 | 116 | } |
b3432a63 | 117 | } |