| 1 | import type { IWorker } from '../worker' |
| 2 | import type { IPool } from '../pool' |
| 3 | import { DEFAULT_MEASUREMENT_STATISTICS_REQUIREMENTS } from '../../utils' |
| 4 | import { AbstractWorkerChoiceStrategy } from './abstract-worker-choice-strategy' |
| 5 | import type { |
| 6 | IWorkerChoiceStrategy, |
| 7 | InternalWorkerChoiceStrategyOptions, |
| 8 | TaskStatisticsRequirements |
| 9 | } from './selection-strategies-types' |
| 10 | |
| 11 | /** |
| 12 | * Selects the next worker with an interleaved weighted round robin scheduling algorithm. |
| 13 | * |
| 14 | * @typeParam Worker - Type of worker which manages the strategy. |
| 15 | * @typeParam Data - Type of data sent to the worker. This can only be structured-cloneable data. |
| 16 | * @typeParam Response - Type of execution response. This can only be structured-cloneable data. |
| 17 | */ |
| 18 | export class InterleavedWeightedRoundRobinWorkerChoiceStrategy< |
| 19 | Worker extends IWorker, |
| 20 | Data = unknown, |
| 21 | Response = unknown |
| 22 | > |
| 23 | extends AbstractWorkerChoiceStrategy<Worker, Data, Response> |
| 24 | implements IWorkerChoiceStrategy { |
| 25 | /** @inheritDoc */ |
| 26 | public readonly taskStatisticsRequirements: TaskStatisticsRequirements = { |
| 27 | runTime: { |
| 28 | aggregate: true, |
| 29 | average: true, |
| 30 | median: false |
| 31 | }, |
| 32 | waitTime: DEFAULT_MEASUREMENT_STATISTICS_REQUIREMENTS, |
| 33 | elu: DEFAULT_MEASUREMENT_STATISTICS_REQUIREMENTS |
| 34 | } |
| 35 | |
| 36 | /** |
| 37 | * Round id. |
| 38 | */ |
| 39 | private roundId: number = 0 |
| 40 | /** |
| 41 | * Round weights. |
| 42 | */ |
| 43 | private roundWeights: number[] |
| 44 | /** |
| 45 | * Worker node id. |
| 46 | */ |
| 47 | private workerNodeId: number = 0 |
| 48 | /** |
| 49 | * Worker node virtual task runtime. |
| 50 | */ |
| 51 | private workerNodeVirtualTaskRunTime: number = 0 |
| 52 | |
| 53 | /** @inheritDoc */ |
| 54 | public constructor ( |
| 55 | pool: IPool<Worker, Data, Response>, |
| 56 | opts: InternalWorkerChoiceStrategyOptions |
| 57 | ) { |
| 58 | super(pool, opts) |
| 59 | this.setTaskStatisticsRequirements(this.opts) |
| 60 | this.roundWeights = this.getRoundWeights() |
| 61 | } |
| 62 | |
| 63 | /** @inheritDoc */ |
| 64 | public reset (): boolean { |
| 65 | this.resetWorkerNodeKeyProperties() |
| 66 | this.roundId = 0 |
| 67 | this.workerNodeId = 0 |
| 68 | this.workerNodeVirtualTaskRunTime = 0 |
| 69 | return true |
| 70 | } |
| 71 | |
| 72 | /** @inheritDoc */ |
| 73 | public update (): boolean { |
| 74 | return true |
| 75 | } |
| 76 | |
| 77 | /** @inheritDoc */ |
| 78 | public choose (): number | undefined { |
| 79 | for ( |
| 80 | let roundIndex = this.roundId; |
| 81 | roundIndex < this.roundWeights.length; |
| 82 | roundIndex++ |
| 83 | ) { |
| 84 | this.roundId = roundIndex |
| 85 | for ( |
| 86 | let workerNodeKey = this.workerNodeId; |
| 87 | workerNodeKey < this.pool.workerNodes.length; |
| 88 | workerNodeKey++ |
| 89 | ) { |
| 90 | this.workerNodeId = workerNodeKey |
| 91 | if ( |
| 92 | this.workerNodeId !== this.nextWorkerNodeKey && |
| 93 | this.workerNodeVirtualTaskRunTime !== 0 |
| 94 | ) { |
| 95 | this.workerNodeVirtualTaskRunTime = 0 |
| 96 | } |
| 97 | const workerWeight = this.opts.weights?.[workerNodeKey] as number |
| 98 | if ( |
| 99 | this.isWorkerNodeReady(workerNodeKey) && |
| 100 | workerWeight >= this.roundWeights[roundIndex] && |
| 101 | this.workerNodeVirtualTaskRunTime < workerWeight |
| 102 | ) { |
| 103 | this.workerNodeVirtualTaskRunTime = |
| 104 | this.workerNodeVirtualTaskRunTime + |
| 105 | this.getWorkerNodeTaskRunTime(workerNodeKey) |
| 106 | this.setPreviousWorkerNodeKey(this.nextWorkerNodeKey) |
| 107 | this.nextWorkerNodeKey = workerNodeKey |
| 108 | return this.nextWorkerNodeKey |
| 109 | } |
| 110 | } |
| 111 | } |
| 112 | this.interleavedWeightedRoundRobinNextWorkerNodeId() |
| 113 | } |
| 114 | |
| 115 | private interleavedWeightedRoundRobinNextWorkerNodeId (): void { |
| 116 | if ( |
| 117 | this.roundId === this.roundWeights.length - 1 && |
| 118 | this.workerNodeId === this.pool.workerNodes.length - 1 |
| 119 | ) { |
| 120 | this.roundId = 0 |
| 121 | this.workerNodeId = 0 |
| 122 | } else if (this.workerNodeId === this.pool.workerNodes.length - 1) { |
| 123 | this.roundId = this.roundId + 1 |
| 124 | this.workerNodeId = 0 |
| 125 | } else { |
| 126 | this.workerNodeId = this.workerNodeId + 1 |
| 127 | } |
| 128 | } |
| 129 | |
| 130 | /** @inheritDoc */ |
| 131 | public remove (workerNodeKey: number): boolean { |
| 132 | if (this.pool.workerNodes.length === 0) { |
| 133 | this.reset() |
| 134 | } |
| 135 | if ( |
| 136 | this.workerNodeId === workerNodeKey && |
| 137 | this.workerNodeId > this.pool.workerNodes.length - 1 |
| 138 | ) { |
| 139 | this.workerNodeId = this.pool.workerNodes.length - 1 |
| 140 | } |
| 141 | if ( |
| 142 | this.previousWorkerNodeKey === workerNodeKey && |
| 143 | this.previousWorkerNodeKey > this.pool.workerNodes.length - 1 |
| 144 | ) { |
| 145 | this.previousWorkerNodeKey = this.pool.workerNodes.length - 1 |
| 146 | } |
| 147 | return true |
| 148 | } |
| 149 | |
| 150 | /** @inheritDoc */ |
| 151 | public setOptions (opts: InternalWorkerChoiceStrategyOptions): void { |
| 152 | super.setOptions(opts) |
| 153 | this.roundWeights = this.getRoundWeights() |
| 154 | } |
| 155 | |
| 156 | private getRoundWeights (): number[] { |
| 157 | return [ |
| 158 | ...new Set( |
| 159 | Object.values(this.opts.weights as Record<number, number>) |
| 160 | .slice() |
| 161 | .sort((a, b) => a - b) |
| 162 | ) |
| 163 | ] |
| 164 | } |
| 165 | } |