Merge branch 'master' of github.com:jerome-benoit/poolifier
[poolifier.git] / src / pools / worker.ts
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85aeb3f3 1import type { MessageChannel } from 'node:worker_threads'
f06e48d8 2import type { CircularArray } from '../circular-array'
5c4d16da 3import type { Task } from '../utility-types'
f06e48d8 4
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5/**
6 * Callback invoked when the worker has started successfully.
7 */
8export type OnlineHandler<Worker extends IWorker> = (this: Worker) => void
9
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10/**
11 * Callback invoked if the worker has received a message.
12 */
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13export type MessageHandler<Worker extends IWorker> = (
14 this: Worker,
e102732c 15 message: unknown
50e66724 16) => void
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17
18/**
19 * Callback invoked if the worker raised an error.
20 */
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21export type ErrorHandler<Worker extends IWorker> = (
22 this: Worker,
e102732c 23 error: Error
50e66724 24) => void
bdaf31cd 25
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26/**
27 * Callback invoked when the worker exits successfully.
28 */
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29export type ExitHandler<Worker extends IWorker> = (
30 this: Worker,
e102732c 31 exitCode: number
50e66724 32) => void
bdaf31cd 33
f06e48d8 34/**
cd4d348a 35 * Measurement statistics.
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36 *
37 * @internal
f06e48d8 38 */
cd4d348a 39export interface MeasurementStatistics {
02706357 40 /**
932fc8be 41 * Measurement aggregate.
02706357 42 */
71514351 43 aggregate?: number
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44 /**
45 * Measurement minimum.
46 */
71514351 47 minimum?: number
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48 /**
49 * Measurement maximum.
50 */
71514351 51 maximum?: number
02706357 52 /**
cd4d348a 53 * Measurement average.
02706357 54 */
71514351 55 average?: number
02706357 56 /**
cd4d348a 57 * Measurement median.
02706357 58 */
71514351 59 median?: number
02706357 60 /**
cd4d348a 61 * Measurement history.
02706357 62 */
eb7bf744 63 readonly history: CircularArray<number>
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64}
65
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66/**
67 * Event loop utilization measurement statistics.
68 *
69 * @internal
70 */
71export interface EventLoopUtilizationMeasurementStatistics {
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72 readonly idle: MeasurementStatistics
73 readonly active: MeasurementStatistics
f7510105 74 utilization?: number
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75}
76
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77/**
78 * Task statistics.
79 *
80 * @internal
81 */
a4e07f72 82export interface TaskStatistics {
02706357 83 /**
9a0613e9 84 * Number of executed tasks.
02706357 85 */
a4e07f72 86 executed: number
02706357 87 /**
9a0613e9 88 * Number of executing tasks.
02706357 89 */
a4e07f72 90 executing: number
0567595a 91 /**
9a0613e9 92 * Number of queued tasks.
0567595a 93 */
8604aaab 94 readonly queued: number
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95 /**
96 * Maximum number of queued tasks.
97 */
b25a42cd 98 readonly maxQueued?: number
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99 /**
100 * Number of stolen tasks.
101 */
102 stolen: number
0567595a 103 /**
9a0613e9 104 * Number of failed tasks.
0567595a 105 */
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106 failed: number
107}
108
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109/**
110 * Enumeration of worker types.
111 */
112export const WorkerTypes = Object.freeze({
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113 thread: 'thread',
114 cluster: 'cluster'
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115} as const)
116
117/**
118 * Worker type.
119 */
120export type WorkerType = keyof typeof WorkerTypes
121
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122/**
123 * Worker information.
124 *
125 * @internal
126 */
127export interface WorkerInfo {
128 /**
83fa0a36 129 * Worker id.
f59e1027 130 */
eb7bf744 131 readonly id: number | undefined
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132 /**
133 * Worker type.
134 */
5b49e864 135 readonly type: WorkerType
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136 /**
137 * Dynamic flag.
138 */
139 dynamic: boolean
f59e1027 140 /**
7c8381eb 141 * Ready flag.
f59e1027 142 */
7c8381eb 143 ready: boolean
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144 /**
145 * Task function names.
146 */
147 taskFunctions?: string[]
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148}
149
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150/**
151 * Worker usage statistics.
152 *
153 * @internal
154 */
155export interface WorkerUsage {
0567595a 156 /**
a4e07f72 157 * Tasks statistics.
0567595a 158 */
eb7bf744 159 readonly tasks: TaskStatistics
0567595a 160 /**
a4e07f72 161 * Tasks runtime statistics.
0567595a 162 */
eb7bf744 163 readonly runTime: MeasurementStatistics
02706357 164 /**
a4e07f72 165 * Tasks wait time statistics.
02706357 166 */
eb7bf744 167 readonly waitTime: MeasurementStatistics
62c15a68 168 /**
5df69fab 169 * Tasks event loop utilization statistics.
62c15a68 170 */
eb7bf744 171 readonly elu: EventLoopUtilizationMeasurementStatistics
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172}
173
174/**
175 * Worker interface.
176 */
177export interface IWorker {
f59e1027 178 /**
83fa0a36 179 * Worker id.
f59e1027 180 */
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181 readonly id?: number
182 readonly threadId?: number
bdaf31cd 183 /**
64383951 184 * Registers an event listener.
bdaf31cd 185 *
38e795c1 186 * @param event - The event.
48ef9107 187 * @param handler - The event handler.
bdaf31cd 188 */
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189 readonly on: ((event: 'online', handler: OnlineHandler<this>) => void) &
190 ((event: 'message', handler: MessageHandler<this>) => void) &
78cea37e 191 ((event: 'error', handler: ErrorHandler<this>) => void) &
78cea37e 192 ((event: 'exit', handler: ExitHandler<this>) => void)
bdaf31cd 193 /**
64383951 194 * Registers a listener to the exit event that will only be performed once.
bdaf31cd 195 *
9ece5893 196 * @param event - The `'exit'` event.
38e795c1 197 * @param handler - The exit handler.
bdaf31cd 198 */
4b628b48 199 readonly once: (event: 'exit', handler: ExitHandler<this>) => void
bdaf31cd 200}
f06e48d8 201
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202/**
203 * Worker node event callback.
204 *
205 * @param workerId - The worker id.
206 * @internal
207 */
a9780ad2 208export type WorkerNodeEventCallback = (workerId: number) => void
ec287edf 209
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210/**
211 * Worker node interface.
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212 *
213 * @typeParam Worker - Type of worker.
e102732c 214 * @typeParam Data - Type of data sent to the worker. This can only be structured-cloneable data.
c319c66b 215 * @internal
f06e48d8 216 */
4b628b48 217export interface IWorkerNode<Worker extends IWorker, Data = unknown> {
c319c66b 218 /**
ccd73e07 219 * Worker.
c319c66b 220 */
02706357 221 readonly worker: Worker
f59e1027 222 /**
ccd73e07 223 * Worker info.
f59e1027 224 */
eb7bf744 225 readonly info: WorkerInfo
c319c66b 226 /**
ccd73e07 227 * Worker usage statistics.
c319c66b 228 */
5b49e864 229 readonly usage: WorkerUsage
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230 /**
231 * Message channel (worker_threads only).
232 */
233 readonly messageChannel?: MessageChannel
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234 /**
235 * Tasks queue back pressure size.
236 * This is the number of tasks that can be enqueued before the worker node has back pressure.
237 */
238 tasksQueueBackPressureSize: number
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239 /**
240 * Callback invoked when worker node tasks queue is back pressured.
72695f86 241 */
a9780ad2 242 onBackPressure?: WorkerNodeEventCallback
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243 /**
244 * Callback invoked when worker node tasks queue is empty.
dd951876 245 */
a9780ad2 246 onEmptyQueue?: WorkerNodeEventCallback
c319c66b 247 /**
ccd73e07 248 * Tasks queue size.
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249 *
250 * @returns The tasks queue size.
251 */
252 readonly tasksQueueSize: () => number
253 /**
ccd73e07 254 * Enqueue task.
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255 *
256 * @param task - The task to queue.
a1763c54 257 * @returns The tasks queue size.
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258 */
259 readonly enqueueTask: (task: Task<Data>) => number
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260 /**
261 * Prepends a task to the tasks queue.
262 *
263 * @param task - The task to prepend.
264 * @returns The tasks queue size.
265 */
266 readonly unshiftTask: (task: Task<Data>) => number
4b628b48 267 /**
ccd73e07 268 * Dequeue task.
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269 *
270 * @returns The dequeued task.
271 */
272 readonly dequeueTask: () => Task<Data> | undefined
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273 /**
274 * Pops a task from the tasks queue.
275 *
276 * @returns The popped task.
277 */
278 readonly popTask: () => Task<Data> | undefined
4b628b48 279 /**
ccd73e07 280 * Clears tasks queue.
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281 */
282 readonly clearTasksQueue: () => void
671d5154 283 /**
e2b31e32 284 * Whether the worker node has back pressure (i.e. its tasks queue is full).
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285 *
286 * @returns `true` if the worker node has back pressure, `false` otherwise.
287 */
288 readonly hasBackPressure: () => boolean
4b628b48 289 /**
ff469b0e 290 * Resets usage statistics.
c319c66b 291 */
4b628b48 292 readonly resetUsage: () => void
3f09ed9f 293 /**
a5d15204 294 * Closes communication channel.
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295 */
296 readonly closeChannel: () => void
ff128cc9 297 /**
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298 * Gets task function worker usage statistics.
299 *
300 * @param name - The task function name.
301 * @returns The task function worker usage statistics if the task function worker usage statistics are initialized, `undefined` otherwise.
ff128cc9 302 */
db0e38ee 303 readonly getTaskFunctionWorkerUsage: (name: string) => WorkerUsage | undefined
f06e48d8 304}