build(deps): bump poolifier
[poolifier.git] / src / pools / worker-node.ts
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85aeb3f3 1import { MessageChannel } from 'node:worker_threads'
4b628b48 2import { CircularArray } from '../circular-array'
5c4d16da 3import type { Task } from '../utility-types'
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4import {
5 DEFAULT_TASK_NAME,
6 EMPTY_FUNCTION,
7 exponentialDelay,
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8 getWorkerId,
9 getWorkerType,
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10 sleep
11} from '../utils'
574b351d 12import { Deque } from '../deque'
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13import {
14 type IWorker,
15 type IWorkerNode,
f3a91bac 16 type StrategyData,
4b628b48 17 type WorkerInfo,
9f95d5eb 18 type WorkerNodeEventDetail,
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19 type WorkerType,
20 WorkerTypes,
21 type WorkerUsage
22} from './worker'
9a38f99e 23import { checkWorkerNodeArguments } from './utils'
4b628b48 24
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25/**
26 * Worker node.
27 *
28 * @typeParam Worker - Type of worker.
29 * @typeParam Data - Type of data sent to the worker. This can only be structured-cloneable data.
30 */
4b628b48 31export class WorkerNode<Worker extends IWorker, Data = unknown>
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32 extends EventTarget
33 implements IWorkerNode<Worker, Data> {
671d5154 34 /** @inheritdoc */
4b628b48 35 public readonly worker: Worker
671d5154 36 /** @inheritdoc */
4b628b48 37 public readonly info: WorkerInfo
671d5154 38 /** @inheritdoc */
4b628b48 39 public usage: WorkerUsage
20c6f652 40 /** @inheritdoc */
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41 public strategyData?: StrategyData
42 /** @inheritdoc */
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43 public messageChannel?: MessageChannel
44 /** @inheritdoc */
20c6f652 45 public tasksQueueBackPressureSize: number
574b351d 46 private readonly tasksQueue: Deque<Task<Data>>
47352846 47 private onBackPressureStarted: boolean
68cbdc84 48 private onEmptyQueueCount: number
26fb3c18 49 private readonly taskFunctionsUsage: Map<string, WorkerUsage>
4b628b48 50
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51 /**
52 * Constructs a new worker node.
53 *
54 * @param worker - The worker.
20c6f652 55 * @param tasksQueueBackPressureSize - The tasks queue back pressure size.
60664f48 56 */
75de9f41 57 constructor (worker: Worker, tasksQueueBackPressureSize: number) {
9f95d5eb 58 super()
9a38f99e 59 checkWorkerNodeArguments<Worker>(worker, tasksQueueBackPressureSize)
4b628b48 60 this.worker = worker
75de9f41 61 this.info = this.initWorkerInfo(worker)
26fb3c18 62 this.usage = this.initWorkerUsage()
75de9f41 63 if (this.info.type === WorkerTypes.thread) {
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64 this.messageChannel = new MessageChannel()
65 }
20c6f652 66 this.tasksQueueBackPressureSize = tasksQueueBackPressureSize
26fb3c18 67 this.tasksQueue = new Deque<Task<Data>>()
47352846 68 this.onBackPressureStarted = false
68cbdc84 69 this.onEmptyQueueCount = 0
26fb3c18 70 this.taskFunctionsUsage = new Map<string, WorkerUsage>()
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71 }
72
73 /** @inheritdoc */
74 public tasksQueueSize (): number {
75 return this.tasksQueue.size
76 }
77
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78 /** @inheritdoc */
79 public enqueueTask (task: Task<Data>): number {
72695f86 80 const tasksQueueSize = this.tasksQueue.push(task)
9f95d5eb 81 if (this.hasBackPressure() && !this.onBackPressureStarted) {
47352846 82 this.onBackPressureStarted = true
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83 this.dispatchEvent(
84 new CustomEvent<WorkerNodeEventDetail>('backpressure', {
85 detail: { workerId: this.info.id as number }
86 })
87 )
47352846 88 this.onBackPressureStarted = false
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89 }
90 return tasksQueueSize
91 }
92
93 /** @inheritdoc */
94 public unshiftTask (task: Task<Data>): number {
95 const tasksQueueSize = this.tasksQueue.unshift(task)
9f95d5eb 96 if (this.hasBackPressure() && !this.onBackPressureStarted) {
47352846 97 this.onBackPressureStarted = true
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98 this.dispatchEvent(
99 new CustomEvent<WorkerNodeEventDetail>('backpressure', {
100 detail: { workerId: this.info.id as number }
101 })
102 )
47352846 103 this.onBackPressureStarted = false
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104 }
105 return tasksQueueSize
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106 }
107
108 /** @inheritdoc */
109 public dequeueTask (): Task<Data> | undefined {
dd951876 110 const task = this.tasksQueue.shift()
9f95d5eb 111 if (this.tasksQueue.size === 0 && this.onEmptyQueueCount === 0) {
68cbdc84 112 this.startOnEmptyQueue().catch(EMPTY_FUNCTION)
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113 }
114 return task
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115 }
116
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117 /** @inheritdoc */
118 public popTask (): Task<Data> | undefined {
dd951876 119 const task = this.tasksQueue.pop()
9f95d5eb 120 if (this.tasksQueue.size === 0 && this.onEmptyQueueCount === 0) {
68cbdc84 121 this.startOnEmptyQueue().catch(EMPTY_FUNCTION)
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122 }
123 return task
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124 }
125
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126 /** @inheritdoc */
127 public clearTasksQueue (): void {
128 this.tasksQueue.clear()
129 }
130
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131 /** @inheritdoc */
132 public hasBackPressure (): boolean {
8735b4e5 133 return this.tasksQueue.size >= this.tasksQueueBackPressureSize
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134 }
135
ff128cc9 136 /** @inheritdoc */
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137 public resetUsage (): void {
138 this.usage = this.initWorkerUsage()
db0e38ee 139 this.taskFunctionsUsage.clear()
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140 }
141
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142 /** @inheritdoc */
143 public closeChannel (): void {
7884d183 144 if (this.messageChannel != null) {
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145 this.messageChannel.port1.unref()
146 this.messageChannel.port2.unref()
147 this.messageChannel.port1.close()
148 this.messageChannel.port2.close()
7884d183 149 delete this.messageChannel
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150 }
151 }
152
ff128cc9 153 /** @inheritdoc */
db0e38ee 154 public getTaskFunctionWorkerUsage (name: string): WorkerUsage | undefined {
6703b9f4 155 if (!Array.isArray(this.info.taskFunctionNames)) {
71b2b6d8 156 throw new Error(
db0e38ee 157 `Cannot get task function worker usage for task function name '${name}' when task function names list is not yet defined`
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158 )
159 }
b558f6b5 160 if (
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161 Array.isArray(this.info.taskFunctionNames) &&
162 this.info.taskFunctionNames.length < 3
b558f6b5 163 ) {
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164 throw new Error(
165 `Cannot get task function worker usage for task function name '${name}' when task function names list has less than 3 elements`
166 )
167 }
168 if (name === DEFAULT_TASK_NAME) {
6703b9f4 169 name = this.info.taskFunctionNames[1]
b558f6b5 170 }
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171 if (!this.taskFunctionsUsage.has(name)) {
172 this.taskFunctionsUsage.set(name, this.initTaskFunctionWorkerUsage(name))
ff128cc9 173 }
db0e38ee 174 return this.taskFunctionsUsage.get(name)
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175 }
176
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177 /** @inheritdoc */
178 public deleteTaskFunctionWorkerUsage (name: string): boolean {
179 return this.taskFunctionsUsage.delete(name)
180 }
181
68cbdc84 182 private async startOnEmptyQueue (): Promise<void> {
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183 if (
184 this.onEmptyQueueCount > 0 &&
79b197bb 185 (this.usage.tasks.executing > 0 || this.tasksQueue.size > 0)
1f0766e7 186 ) {
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187 this.onEmptyQueueCount = 0
188 return
189 }
60b7a7cc 190 ++this.onEmptyQueueCount
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191 this.dispatchEvent(
192 new CustomEvent<WorkerNodeEventDetail>('emptyqueue', {
193 detail: { workerId: this.info.id as number }
194 })
195 )
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196 await sleep(exponentialDelay(this.onEmptyQueueCount))
197 await this.startOnEmptyQueue()
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198 }
199
75de9f41 200 private initWorkerInfo (worker: Worker): WorkerInfo {
4b628b48 201 return {
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202 id: getWorkerId(worker),
203 type: getWorkerType(worker) as WorkerType,
4b628b48 204 dynamic: false,
7884d183 205 ready: false
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206 }
207 }
208
209 private initWorkerUsage (): WorkerUsage {
210 const getTasksQueueSize = (): number => {
dd951876 211 return this.tasksQueue.size
4b628b48 212 }
bf4ef2ca 213 const getTasksQueueMaxSize = (): number => {
dd951876 214 return this.tasksQueue.maxSize
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215 }
216 return {
217 tasks: {
218 executed: 0,
219 executing: 0,
220 get queued (): number {
221 return getTasksQueueSize()
222 },
223 get maxQueued (): number {
bf4ef2ca 224 return getTasksQueueMaxSize()
4b628b48 225 },
68cbdc84 226 stolen: 0,
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227 failed: 0
228 },
229 runTime: {
c52475b8 230 history: new CircularArray<number>()
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231 },
232 waitTime: {
c52475b8 233 history: new CircularArray<number>()
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234 },
235 elu: {
236 idle: {
c52475b8 237 history: new CircularArray<number>()
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238 },
239 active: {
c52475b8 240 history: new CircularArray<number>()
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241 }
242 }
243 }
244 }
245
db0e38ee 246 private initTaskFunctionWorkerUsage (name: string): WorkerUsage {
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247 const getTaskFunctionQueueSize = (): number => {
248 let taskFunctionQueueSize = 0
b25a42cd 249 for (const task of this.tasksQueue) {
dd92a715 250 if (
e5ece61d 251 (task.name === DEFAULT_TASK_NAME &&
6703b9f4 252 name === (this.info.taskFunctionNames as string[])[1]) ||
e5ece61d 253 (task.name !== DEFAULT_TASK_NAME && name === task.name)
dd92a715 254 ) {
e5ece61d 255 ++taskFunctionQueueSize
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256 }
257 }
e5ece61d 258 return taskFunctionQueueSize
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259 }
260 return {
261 tasks: {
262 executed: 0,
263 executing: 0,
264 get queued (): number {
e5ece61d 265 return getTaskFunctionQueueSize()
b25a42cd 266 },
68cbdc84 267 stolen: 0,
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268 failed: 0
269 },
270 runTime: {
c52475b8 271 history: new CircularArray<number>()
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272 },
273 waitTime: {
c52475b8 274 history: new CircularArray<number>()
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275 },
276 elu: {
277 idle: {
c52475b8 278 history: new CircularArray<number>()
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279 },
280 active: {
c52475b8 281 history: new CircularArray<number>()
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282 }
283 }
284 }
285 }
4b628b48 286}