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