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f06e48d8 | 1 | import type { IWorker } from '../worker' |
65d7a1c9 | 2 | import type { IPool } from '../pool' |
3c93feb9 JB |
3 | import { |
4 | DEFAULT_MEASUREMENT_STATISTICS_REQUIREMENTS, | |
5 | DEFAULT_WORKER_CHOICE_STRATEGY_OPTIONS | |
6 | } from '../../utils' | |
b3432a63 | 7 | import { AbstractWorkerChoiceStrategy } from './abstract-worker-choice-strategy' |
bf90656c JB |
8 | import type { |
9 | IWorkerChoiceStrategy, | |
6c6afb84 | 10 | StrategyPolicy, |
87de9ff5 | 11 | TaskStatisticsRequirements, |
da309861 | 12 | WorkerChoiceStrategyOptions |
bf90656c | 13 | } from './selection-strategies-types' |
b3432a63 | 14 | |
b3432a63 JB |
15 | /** |
16 | * Selects the next worker with a weighted round robin scheduling algorithm. | |
17 | * Loosely modeled after the weighted round robin queueing algorithm: https://en.wikipedia.org/wiki/Weighted_round_robin. | |
18 | * | |
38e795c1 | 19 | * @typeParam Worker - Type of worker which manages the strategy. |
e102732c JB |
20 | * @typeParam Data - Type of data sent to the worker. This can only be structured-cloneable data. |
21 | * @typeParam Response - Type of execution response. This can only be structured-cloneable data. | |
b3432a63 JB |
22 | */ |
23 | export class WeightedRoundRobinWorkerChoiceStrategy< | |
f06e48d8 | 24 | Worker extends IWorker, |
b2b1d84e JB |
25 | Data = unknown, |
26 | Response = unknown | |
bf90656c JB |
27 | > |
28 | extends AbstractWorkerChoiceStrategy<Worker, Data, Response> | |
17393ac8 | 29 | implements IWorkerChoiceStrategy { |
6c6afb84 JB |
30 | /** @inheritDoc */ |
31 | public readonly strategyPolicy: StrategyPolicy = { | |
32 | useDynamicWorker: true | |
33 | } | |
34 | ||
afc003b2 | 35 | /** @inheritDoc */ |
87de9ff5 | 36 | public readonly taskStatisticsRequirements: TaskStatisticsRequirements = { |
932fc8be JB |
37 | runTime: { |
38 | aggregate: true, | |
39 | average: true, | |
40 | median: false | |
41 | }, | |
3c93feb9 JB |
42 | waitTime: DEFAULT_MEASUREMENT_STATISTICS_REQUIREMENTS, |
43 | elu: DEFAULT_MEASUREMENT_STATISTICS_REQUIREMENTS | |
10fcfaf4 JB |
44 | } |
45 | ||
b3432a63 JB |
46 | /** |
47 | * Default worker weight. | |
48 | */ | |
777af0ac | 49 | private readonly defaultWorkerWeight: number |
b3432a63 | 50 | /** |
08f3f44c | 51 | * Worker virtual task runtime. |
b3432a63 | 52 | */ |
08f3f44c | 53 | private workerVirtualTaskRunTime: number = 0 |
b3432a63 | 54 | |
2fc5cae3 | 55 | /** @inheritDoc */ |
da309861 | 56 | public constructor ( |
c4855468 | 57 | pool: IPool<Worker, Data, Response>, |
2fc5cae3 | 58 | opts: WorkerChoiceStrategyOptions = DEFAULT_WORKER_CHOICE_STRATEGY_OPTIONS |
da309861 JB |
59 | ) { |
60 | super(pool, opts) | |
932fc8be | 61 | this.setTaskStatisticsRequirements(this.opts) |
08f3f44c | 62 | this.defaultWorkerWeight = this.computeDefaultWorkerWeight() |
b3432a63 JB |
63 | } |
64 | ||
afc003b2 | 65 | /** @inheritDoc */ |
a6f7f1b4 | 66 | public reset (): boolean { |
9b106837 | 67 | this.nextWorkerNodeKey = 0 |
08f3f44c | 68 | this.workerVirtualTaskRunTime = 0 |
ea7a90d3 JB |
69 | return true |
70 | } | |
71 | ||
138d29a8 JB |
72 | /** @inheritDoc */ |
73 | public update (): boolean { | |
74 | return true | |
75 | } | |
76 | ||
afc003b2 | 77 | /** @inheritDoc */ |
c923ce56 | 78 | public choose (): number { |
9b106837 | 79 | const chosenWorkerNodeKey = this.nextWorkerNodeKey |
949194eb JB |
80 | do { |
81 | this.weightedRoundRobinNextWorkerNodeKey() | |
82 | } while (!this.isWorkerNodeReady(this.nextWorkerNodeKey)) | |
f06e48d8 | 83 | return chosenWorkerNodeKey |
b3432a63 JB |
84 | } |
85 | ||
afc003b2 | 86 | /** @inheritDoc */ |
f06e48d8 | 87 | public remove (workerNodeKey: number): boolean { |
9b106837 | 88 | if (this.nextWorkerNodeKey === workerNodeKey) { |
f06e48d8 | 89 | if (this.pool.workerNodes.length === 0) { |
9b106837 JB |
90 | this.nextWorkerNodeKey = 0 |
91 | } else if (this.nextWorkerNodeKey > this.pool.workerNodes.length - 1) { | |
92 | this.nextWorkerNodeKey = this.pool.workerNodes.length - 1 | |
78ab2555 | 93 | } |
08f3f44c | 94 | this.workerVirtualTaskRunTime = 0 |
97a2abc3 | 95 | } |
08f3f44c | 96 | return true |
2377984d | 97 | } |
9b106837 | 98 | |
20016c79 | 99 | private weightedRoundRobinNextWorkerNodeKey (): number { |
9b106837 JB |
100 | const workerVirtualTaskRunTime = this.workerVirtualTaskRunTime |
101 | const workerWeight = | |
102 | this.opts.weights?.[this.nextWorkerNodeKey] ?? this.defaultWorkerWeight | |
103 | if (workerVirtualTaskRunTime < workerWeight) { | |
104 | this.workerVirtualTaskRunTime = | |
105 | workerVirtualTaskRunTime + | |
106 | this.getWorkerTaskRunTime(this.nextWorkerNodeKey) | |
107 | } else { | |
108 | this.nextWorkerNodeKey = | |
109 | this.nextWorkerNodeKey === this.pool.workerNodes.length - 1 | |
110 | ? 0 | |
111 | : this.nextWorkerNodeKey + 1 | |
112 | this.workerVirtualTaskRunTime = 0 | |
113 | } | |
20016c79 | 114 | return this.nextWorkerNodeKey |
9b106837 | 115 | } |
b3432a63 | 116 | } |