| 1 | import { AsyncResource } from 'node:async_hooks' |
| 2 | import type { Worker } from 'node:cluster' |
| 3 | import type { MessagePort } from 'node:worker_threads' |
| 4 | import { performance } from 'node:perf_hooks' |
| 5 | import type { |
| 6 | MessageValue, |
| 7 | Task, |
| 8 | TaskPerformance, |
| 9 | WorkerStatistics |
| 10 | } from '../utility-types' |
| 11 | import { |
| 12 | DEFAULT_TASK_NAME, |
| 13 | EMPTY_FUNCTION, |
| 14 | isAsyncFunction, |
| 15 | isPlainObject |
| 16 | } from '../utils' |
| 17 | import { KillBehaviors, type WorkerOptions } from './worker-options' |
| 18 | import type { |
| 19 | TaskAsyncFunction, |
| 20 | TaskFunction, |
| 21 | TaskFunctions, |
| 22 | TaskSyncFunction |
| 23 | } from './task-functions' |
| 24 | |
| 25 | const DEFAULT_MAX_INACTIVE_TIME = 60000 |
| 26 | const DEFAULT_WORKER_OPTIONS: WorkerOptions = { |
| 27 | /** |
| 28 | * The kill behavior option on this worker or its default value. |
| 29 | */ |
| 30 | killBehavior: KillBehaviors.SOFT, |
| 31 | /** |
| 32 | * The maximum time to keep this worker active while idle. |
| 33 | * The pool automatically checks and terminates this worker when the time expires. |
| 34 | */ |
| 35 | maxInactiveTime: DEFAULT_MAX_INACTIVE_TIME, |
| 36 | /** |
| 37 | * The function to call when the worker is killed. |
| 38 | */ |
| 39 | killHandler: EMPTY_FUNCTION |
| 40 | } |
| 41 | |
| 42 | /** |
| 43 | * Base class that implements some shared logic for all poolifier workers. |
| 44 | * |
| 45 | * @typeParam MainWorker - Type of main worker. |
| 46 | * @typeParam Data - Type of data this worker receives from pool's execution. This can only be structured-cloneable data. |
| 47 | * @typeParam Response - Type of response the worker sends back to the main worker. This can only be structured-cloneable data. |
| 48 | */ |
| 49 | export abstract class AbstractWorker< |
| 50 | MainWorker extends Worker | MessagePort, |
| 51 | Data = unknown, |
| 52 | Response = unknown |
| 53 | > extends AsyncResource { |
| 54 | /** |
| 55 | * Worker id. |
| 56 | */ |
| 57 | protected abstract id: number |
| 58 | /** |
| 59 | * Task function(s) processed by the worker when the pool's `execution` function is invoked. |
| 60 | */ |
| 61 | protected taskFunctions!: Map<string, TaskFunction<Data, Response>> |
| 62 | /** |
| 63 | * Timestamp of the last task processed by this worker. |
| 64 | */ |
| 65 | protected lastTaskTimestamp!: number |
| 66 | /** |
| 67 | * Performance statistics computation requirements. |
| 68 | */ |
| 69 | protected statistics!: WorkerStatistics |
| 70 | /** |
| 71 | * Handler id of the `activeInterval` worker activity check. |
| 72 | */ |
| 73 | protected activeInterval?: NodeJS.Timeout |
| 74 | /** |
| 75 | * Constructs a new poolifier worker. |
| 76 | * |
| 77 | * @param type - The type of async event. |
| 78 | * @param isMain - Whether this is the main worker or not. |
| 79 | * @param mainWorker - Reference to main worker. |
| 80 | * @param taskFunctions - Task function(s) processed by the worker when the pool's `execution` function is invoked. The first function is the default function. |
| 81 | * @param opts - Options for the worker. |
| 82 | */ |
| 83 | public constructor ( |
| 84 | type: string, |
| 85 | protected readonly isMain: boolean, |
| 86 | private readonly mainWorker: MainWorker, |
| 87 | taskFunctions: TaskFunction<Data, Response> | TaskFunctions<Data, Response>, |
| 88 | protected opts: WorkerOptions = DEFAULT_WORKER_OPTIONS |
| 89 | ) { |
| 90 | super(type) |
| 91 | this.checkWorkerOptions(this.opts) |
| 92 | this.checkTaskFunctions(taskFunctions) |
| 93 | if (!this.isMain) { |
| 94 | this.getMainWorker()?.on('message', this.handleReadyMessage.bind(this)) |
| 95 | } |
| 96 | } |
| 97 | |
| 98 | private checkWorkerOptions (opts: WorkerOptions): void { |
| 99 | this.opts = { ...DEFAULT_WORKER_OPTIONS, ...opts } |
| 100 | delete this.opts.async |
| 101 | } |
| 102 | |
| 103 | /** |
| 104 | * Checks if the `taskFunctions` parameter is passed to the constructor. |
| 105 | * |
| 106 | * @param taskFunctions - The task function(s) parameter that should be checked. |
| 107 | */ |
| 108 | private checkTaskFunctions ( |
| 109 | taskFunctions: TaskFunction<Data, Response> | TaskFunctions<Data, Response> |
| 110 | ): void { |
| 111 | if (taskFunctions == null) { |
| 112 | throw new Error('taskFunctions parameter is mandatory') |
| 113 | } |
| 114 | this.taskFunctions = new Map<string, TaskFunction<Data, Response>>() |
| 115 | if (typeof taskFunctions === 'function') { |
| 116 | const boundFn = taskFunctions.bind(this) |
| 117 | this.taskFunctions.set(DEFAULT_TASK_NAME, boundFn) |
| 118 | this.taskFunctions.set( |
| 119 | typeof taskFunctions.name === 'string' && |
| 120 | taskFunctions.name.trim().length > 0 |
| 121 | ? taskFunctions.name |
| 122 | : 'fn1', |
| 123 | boundFn |
| 124 | ) |
| 125 | } else if (isPlainObject(taskFunctions)) { |
| 126 | let firstEntry = true |
| 127 | for (const [name, fn] of Object.entries(taskFunctions)) { |
| 128 | if (typeof name !== 'string') { |
| 129 | throw new TypeError( |
| 130 | 'A taskFunctions parameter object key is not a string' |
| 131 | ) |
| 132 | } |
| 133 | if (typeof name === 'string' && name.trim().length === 0) { |
| 134 | throw new TypeError( |
| 135 | 'A taskFunctions parameter object key an empty string' |
| 136 | ) |
| 137 | } |
| 138 | if (typeof fn !== 'function') { |
| 139 | throw new TypeError( |
| 140 | 'A taskFunctions parameter object value is not a function' |
| 141 | ) |
| 142 | } |
| 143 | const boundFn = fn.bind(this) |
| 144 | if (firstEntry) { |
| 145 | this.taskFunctions.set(DEFAULT_TASK_NAME, boundFn) |
| 146 | firstEntry = false |
| 147 | } |
| 148 | this.taskFunctions.set(name, boundFn) |
| 149 | } |
| 150 | if (firstEntry) { |
| 151 | throw new Error('taskFunctions parameter object is empty') |
| 152 | } |
| 153 | } else { |
| 154 | throw new TypeError( |
| 155 | 'taskFunctions parameter is not a function or a plain object' |
| 156 | ) |
| 157 | } |
| 158 | } |
| 159 | |
| 160 | /** |
| 161 | * Checks if the worker has a task function with the given name. |
| 162 | * |
| 163 | * @param name - The name of the task function to check. |
| 164 | * @returns Whether the worker has a task function with the given name or not. |
| 165 | * @throws {@link https://nodejs.org/api/errors.html#class-typeerror} If the `name` parameter is not a string or an empty string. |
| 166 | */ |
| 167 | public hasTaskFunction (name: string): boolean { |
| 168 | this.checkTaskFunctionName(name) |
| 169 | return this.taskFunctions.has(name) |
| 170 | } |
| 171 | |
| 172 | /** |
| 173 | * Adds a task function to the worker. |
| 174 | * If a task function with the same name already exists, it is replaced. |
| 175 | * |
| 176 | * @param name - The name of the task function to add. |
| 177 | * @param fn - The task function to add. |
| 178 | * @returns Whether the task function was added or not. |
| 179 | * @throws {@link https://nodejs.org/api/errors.html#class-typeerror} If the `name` parameter is not a string or an empty string. |
| 180 | * @throws {@link https://nodejs.org/api/errors.html#class-error} If the `name` parameter is the default task function reserved name. |
| 181 | * @throws {@link https://nodejs.org/api/errors.html#class-typeerror} If the `fn` parameter is not a function. |
| 182 | */ |
| 183 | public addTaskFunction ( |
| 184 | name: string, |
| 185 | fn: TaskFunction<Data, Response> |
| 186 | ): boolean { |
| 187 | this.checkTaskFunctionName(name) |
| 188 | if (name === DEFAULT_TASK_NAME) { |
| 189 | throw new Error( |
| 190 | 'Cannot add a task function with the default reserved name' |
| 191 | ) |
| 192 | } |
| 193 | if (typeof fn !== 'function') { |
| 194 | throw new TypeError('fn parameter is not a function') |
| 195 | } |
| 196 | try { |
| 197 | const boundFn = fn.bind(this) |
| 198 | if ( |
| 199 | this.taskFunctions.get(name) === |
| 200 | this.taskFunctions.get(DEFAULT_TASK_NAME) |
| 201 | ) { |
| 202 | this.taskFunctions.set(DEFAULT_TASK_NAME, boundFn) |
| 203 | } |
| 204 | this.taskFunctions.set(name, boundFn) |
| 205 | this.sendTaskFunctionsListToMainWorker() |
| 206 | return true |
| 207 | } catch { |
| 208 | return false |
| 209 | } |
| 210 | } |
| 211 | |
| 212 | /** |
| 213 | * Removes a task function from the worker. |
| 214 | * |
| 215 | * @param name - The name of the task function to remove. |
| 216 | * @returns Whether the task function existed and was removed or not. |
| 217 | * @throws {@link https://nodejs.org/api/errors.html#class-typeerror} If the `name` parameter is not a string or an empty string. |
| 218 | * @throws {@link https://nodejs.org/api/errors.html#class-error} If the `name` parameter is the default task function reserved name. |
| 219 | * @throws {@link https://nodejs.org/api/errors.html#class-error} If the `name` parameter is the task function used as default task function. |
| 220 | */ |
| 221 | public removeTaskFunction (name: string): boolean { |
| 222 | this.checkTaskFunctionName(name) |
| 223 | if (name === DEFAULT_TASK_NAME) { |
| 224 | throw new Error( |
| 225 | 'Cannot remove the task function with the default reserved name' |
| 226 | ) |
| 227 | } |
| 228 | if ( |
| 229 | this.taskFunctions.get(name) === this.taskFunctions.get(DEFAULT_TASK_NAME) |
| 230 | ) { |
| 231 | throw new Error( |
| 232 | 'Cannot remove the task function used as the default task function' |
| 233 | ) |
| 234 | } |
| 235 | const deleteStatus = this.taskFunctions.delete(name) |
| 236 | this.sendTaskFunctionsListToMainWorker() |
| 237 | return deleteStatus |
| 238 | } |
| 239 | |
| 240 | /** |
| 241 | * Lists the names of the worker's task functions. |
| 242 | * |
| 243 | * @returns The names of the worker's task functions. |
| 244 | */ |
| 245 | public listTaskFunctions (): string[] { |
| 246 | const names: string[] = [...this.taskFunctions.keys()] |
| 247 | let defaultTaskFunctionName: string = DEFAULT_TASK_NAME |
| 248 | for (const [name, fn] of this.taskFunctions) { |
| 249 | if ( |
| 250 | name !== DEFAULT_TASK_NAME && |
| 251 | fn === this.taskFunctions.get(DEFAULT_TASK_NAME) |
| 252 | ) { |
| 253 | defaultTaskFunctionName = name |
| 254 | break |
| 255 | } |
| 256 | } |
| 257 | return [ |
| 258 | names[names.indexOf(DEFAULT_TASK_NAME)], |
| 259 | defaultTaskFunctionName, |
| 260 | ...names.filter( |
| 261 | (name) => name !== DEFAULT_TASK_NAME && name !== defaultTaskFunctionName |
| 262 | ) |
| 263 | ] |
| 264 | } |
| 265 | |
| 266 | /** |
| 267 | * Sets the default task function to use in the worker. |
| 268 | * |
| 269 | * @param name - The name of the task function to use as default task function. |
| 270 | * @returns Whether the default task function was set or not. |
| 271 | * @throws {@link https://nodejs.org/api/errors.html#class-typeerror} If the `name` parameter is not a string or an empty string. |
| 272 | * @throws {@link https://nodejs.org/api/errors.html#class-error} If the `name` parameter is the default task function reserved name. |
| 273 | * @throws {@link https://nodejs.org/api/errors.html#class-error} If the `name` parameter is a non-existing task function. |
| 274 | */ |
| 275 | public setDefaultTaskFunction (name: string): boolean { |
| 276 | this.checkTaskFunctionName(name) |
| 277 | if (name === DEFAULT_TASK_NAME) { |
| 278 | throw new Error( |
| 279 | 'Cannot set the default task function reserved name as the default task function' |
| 280 | ) |
| 281 | } |
| 282 | if (!this.taskFunctions.has(name)) { |
| 283 | throw new Error( |
| 284 | 'Cannot set the default task function to a non-existing task function' |
| 285 | ) |
| 286 | } |
| 287 | try { |
| 288 | this.taskFunctions.set( |
| 289 | DEFAULT_TASK_NAME, |
| 290 | this.taskFunctions.get(name) as TaskFunction<Data, Response> |
| 291 | ) |
| 292 | return true |
| 293 | } catch { |
| 294 | return false |
| 295 | } |
| 296 | } |
| 297 | |
| 298 | private checkTaskFunctionName (name: string): void { |
| 299 | if (typeof name !== 'string') { |
| 300 | throw new TypeError('name parameter is not a string') |
| 301 | } |
| 302 | if (typeof name === 'string' && name.trim().length === 0) { |
| 303 | throw new TypeError('name parameter is an empty string') |
| 304 | } |
| 305 | } |
| 306 | |
| 307 | /** |
| 308 | * Handles the ready message sent by the main worker. |
| 309 | * |
| 310 | * @param message - The ready message. |
| 311 | */ |
| 312 | protected abstract handleReadyMessage (message: MessageValue<Data>): void |
| 313 | |
| 314 | /** |
| 315 | * Worker message listener. |
| 316 | * |
| 317 | * @param message - The received message. |
| 318 | */ |
| 319 | protected messageListener (message: MessageValue<Data>): void { |
| 320 | this.checkMessageWorkerId(message) |
| 321 | if (message.statistics != null) { |
| 322 | // Statistics message received |
| 323 | this.statistics = message.statistics |
| 324 | } else if (message.checkActive != null) { |
| 325 | // Check active message received |
| 326 | message.checkActive ? this.startCheckActive() : this.stopCheckActive() |
| 327 | } else if (message.taskId != null && message.data != null) { |
| 328 | // Task message received |
| 329 | this.run(message) |
| 330 | } else if (message.kill === true) { |
| 331 | // Kill message received |
| 332 | this.handleKillMessage(message) |
| 333 | } |
| 334 | } |
| 335 | |
| 336 | /** |
| 337 | * Handles a kill message sent by the main worker. |
| 338 | * |
| 339 | * @param message - The kill message. |
| 340 | */ |
| 341 | protected handleKillMessage (message: MessageValue<Data>): void { |
| 342 | this.stopCheckActive() |
| 343 | if (isAsyncFunction(this.opts.killHandler)) { |
| 344 | (this.opts.killHandler?.() as Promise<void>) |
| 345 | .then(() => { |
| 346 | this.sendToMainWorker({ kill: 'success', workerId: this.id }) |
| 347 | return null |
| 348 | }) |
| 349 | .catch(() => { |
| 350 | this.sendToMainWorker({ kill: 'failure', workerId: this.id }) |
| 351 | }) |
| 352 | .finally(() => { |
| 353 | this.emitDestroy() |
| 354 | }) |
| 355 | .catch(EMPTY_FUNCTION) |
| 356 | } else { |
| 357 | try { |
| 358 | // eslint-disable-next-line @typescript-eslint/no-invalid-void-type |
| 359 | this.opts.killHandler?.() as void |
| 360 | this.sendToMainWorker({ kill: 'success', workerId: this.id }) |
| 361 | } catch { |
| 362 | this.sendToMainWorker({ kill: 'failure', workerId: this.id }) |
| 363 | } finally { |
| 364 | this.emitDestroy() |
| 365 | } |
| 366 | } |
| 367 | } |
| 368 | |
| 369 | /** |
| 370 | * Check if the message worker id is set and matches the worker id. |
| 371 | * |
| 372 | * @param message - The message to check. |
| 373 | * @throws {@link https://nodejs.org/api/errors.html#class-error} If the message worker id is not set or does not match the worker id. |
| 374 | */ |
| 375 | private checkMessageWorkerId (message: MessageValue<Data>): void { |
| 376 | if (message.workerId == null) { |
| 377 | throw new Error('Message worker id is not set') |
| 378 | } else if (message.workerId != null && message.workerId !== this.id) { |
| 379 | throw new Error( |
| 380 | `Message worker id ${message.workerId} does not match the worker id ${this.id}` |
| 381 | ) |
| 382 | } |
| 383 | } |
| 384 | |
| 385 | /** |
| 386 | * Starts the worker check active interval. |
| 387 | */ |
| 388 | private startCheckActive (): void { |
| 389 | this.lastTaskTimestamp = performance.now() |
| 390 | this.activeInterval = setInterval( |
| 391 | this.checkActive.bind(this), |
| 392 | (this.opts.maxInactiveTime ?? DEFAULT_MAX_INACTIVE_TIME) / 2 |
| 393 | ) |
| 394 | } |
| 395 | |
| 396 | /** |
| 397 | * Stops the worker check active interval. |
| 398 | */ |
| 399 | private stopCheckActive (): void { |
| 400 | if (this.activeInterval != null) { |
| 401 | clearInterval(this.activeInterval) |
| 402 | delete this.activeInterval |
| 403 | } |
| 404 | } |
| 405 | |
| 406 | /** |
| 407 | * Checks if the worker should be terminated, because its living too long. |
| 408 | */ |
| 409 | private checkActive (): void { |
| 410 | if ( |
| 411 | performance.now() - this.lastTaskTimestamp > |
| 412 | (this.opts.maxInactiveTime ?? DEFAULT_MAX_INACTIVE_TIME) |
| 413 | ) { |
| 414 | this.sendToMainWorker({ kill: this.opts.killBehavior, workerId: this.id }) |
| 415 | } |
| 416 | } |
| 417 | |
| 418 | /** |
| 419 | * Returns the main worker. |
| 420 | * |
| 421 | * @returns Reference to the main worker. |
| 422 | */ |
| 423 | protected getMainWorker (): MainWorker { |
| 424 | if (this.mainWorker == null) { |
| 425 | throw new Error('Main worker not set') |
| 426 | } |
| 427 | return this.mainWorker |
| 428 | } |
| 429 | |
| 430 | /** |
| 431 | * Sends a message to main worker. |
| 432 | * |
| 433 | * @param message - The response message. |
| 434 | */ |
| 435 | protected abstract sendToMainWorker ( |
| 436 | message: MessageValue<Response, Data> |
| 437 | ): void |
| 438 | |
| 439 | /** |
| 440 | * Sends the list of task function names to the main worker. |
| 441 | */ |
| 442 | protected sendTaskFunctionsListToMainWorker (): void { |
| 443 | this.sendToMainWorker({ |
| 444 | taskFunctions: this.listTaskFunctions(), |
| 445 | workerId: this.id |
| 446 | }) |
| 447 | } |
| 448 | |
| 449 | /** |
| 450 | * Handles an error and convert it to a string so it can be sent back to the main worker. |
| 451 | * |
| 452 | * @param e - The error raised by the worker. |
| 453 | * @returns The error message. |
| 454 | */ |
| 455 | protected handleError (e: Error | string): string { |
| 456 | return e instanceof Error ? e.message : e |
| 457 | } |
| 458 | |
| 459 | /** |
| 460 | * Runs the given task. |
| 461 | * |
| 462 | * @param task - The task to execute. |
| 463 | * @throws {@link https://nodejs.org/api/errors.html#class-error} If the task function is not found. |
| 464 | */ |
| 465 | protected run (task: Task<Data>): void { |
| 466 | const fn = this.getTaskFunction(task.name) |
| 467 | if (isAsyncFunction(fn)) { |
| 468 | this.runInAsyncScope(this.runAsync.bind(this), this, fn, task) |
| 469 | } else { |
| 470 | this.runInAsyncScope(this.runSync.bind(this), this, fn, task) |
| 471 | } |
| 472 | } |
| 473 | |
| 474 | /** |
| 475 | * Runs the given task function synchronously. |
| 476 | * |
| 477 | * @param fn - Task function that will be executed. |
| 478 | * @param task - Input data for the task function. |
| 479 | */ |
| 480 | protected runSync ( |
| 481 | fn: TaskSyncFunction<Data, Response>, |
| 482 | task: Task<Data> |
| 483 | ): void { |
| 484 | const { name, taskId, data } = task |
| 485 | try { |
| 486 | let taskPerformance = this.beginTaskPerformance(name) |
| 487 | const res = fn(data) |
| 488 | taskPerformance = this.endTaskPerformance(taskPerformance) |
| 489 | this.sendToMainWorker({ |
| 490 | data: res, |
| 491 | taskPerformance, |
| 492 | workerId: this.id, |
| 493 | taskId |
| 494 | }) |
| 495 | } catch (e) { |
| 496 | const errorMessage = this.handleError(e as Error | string) |
| 497 | this.sendToMainWorker({ |
| 498 | taskError: { |
| 499 | name: name as string, |
| 500 | message: errorMessage, |
| 501 | data |
| 502 | }, |
| 503 | workerId: this.id, |
| 504 | taskId |
| 505 | }) |
| 506 | } finally { |
| 507 | this.updateLastTaskTimestamp() |
| 508 | } |
| 509 | } |
| 510 | |
| 511 | /** |
| 512 | * Runs the given task function asynchronously. |
| 513 | * |
| 514 | * @param fn - Task function that will be executed. |
| 515 | * @param task - Input data for the task function. |
| 516 | */ |
| 517 | protected runAsync ( |
| 518 | fn: TaskAsyncFunction<Data, Response>, |
| 519 | task: Task<Data> |
| 520 | ): void { |
| 521 | const { name, taskId, data } = task |
| 522 | let taskPerformance = this.beginTaskPerformance(name) |
| 523 | fn(data) |
| 524 | .then((res) => { |
| 525 | taskPerformance = this.endTaskPerformance(taskPerformance) |
| 526 | this.sendToMainWorker({ |
| 527 | data: res, |
| 528 | taskPerformance, |
| 529 | workerId: this.id, |
| 530 | taskId |
| 531 | }) |
| 532 | return null |
| 533 | }) |
| 534 | .catch((e) => { |
| 535 | const errorMessage = this.handleError(e as Error | string) |
| 536 | this.sendToMainWorker({ |
| 537 | taskError: { |
| 538 | name: name as string, |
| 539 | message: errorMessage, |
| 540 | data |
| 541 | }, |
| 542 | workerId: this.id, |
| 543 | taskId |
| 544 | }) |
| 545 | }) |
| 546 | .finally(() => { |
| 547 | this.updateLastTaskTimestamp() |
| 548 | }) |
| 549 | .catch(EMPTY_FUNCTION) |
| 550 | } |
| 551 | |
| 552 | /** |
| 553 | * Gets the task function with the given name. |
| 554 | * |
| 555 | * @param name - Name of the task function that will be returned. |
| 556 | * @returns The task function. |
| 557 | * @throws {@link https://nodejs.org/api/errors.html#class-error} If the task function is not found. |
| 558 | */ |
| 559 | private getTaskFunction (name?: string): TaskFunction<Data, Response> { |
| 560 | name = name ?? DEFAULT_TASK_NAME |
| 561 | const fn = this.taskFunctions.get(name) |
| 562 | if (fn == null) { |
| 563 | throw new Error(`Task function '${name}' not found`) |
| 564 | } |
| 565 | return fn |
| 566 | } |
| 567 | |
| 568 | private beginTaskPerformance (name?: string): TaskPerformance { |
| 569 | this.checkStatistics() |
| 570 | return { |
| 571 | name: name ?? DEFAULT_TASK_NAME, |
| 572 | timestamp: performance.now(), |
| 573 | ...(this.statistics.elu && { elu: performance.eventLoopUtilization() }) |
| 574 | } |
| 575 | } |
| 576 | |
| 577 | private endTaskPerformance ( |
| 578 | taskPerformance: TaskPerformance |
| 579 | ): TaskPerformance { |
| 580 | this.checkStatistics() |
| 581 | return { |
| 582 | ...taskPerformance, |
| 583 | ...(this.statistics.runTime && { |
| 584 | runTime: performance.now() - taskPerformance.timestamp |
| 585 | }), |
| 586 | ...(this.statistics.elu && { |
| 587 | elu: performance.eventLoopUtilization(taskPerformance.elu) |
| 588 | }) |
| 589 | } |
| 590 | } |
| 591 | |
| 592 | private checkStatistics (): void { |
| 593 | if (this.statistics == null) { |
| 594 | throw new Error('Performance statistics computation requirements not set') |
| 595 | } |
| 596 | } |
| 597 | |
| 598 | private updateLastTaskTimestamp (): void { |
| 599 | if (this.activeInterval != null) { |
| 600 | this.lastTaskTimestamp = performance.now() |
| 601 | } |
| 602 | } |
| 603 | } |