| 1 | import { randomUUID } from 'node:crypto' |
| 2 | import { performance } from 'node:perf_hooks' |
| 3 | import type { TransferListItem } from 'node:worker_threads' |
| 4 | import { EventEmitterAsyncResource } from 'node:events' |
| 5 | import { AsyncResource } from 'node:async_hooks' |
| 6 | import type { |
| 7 | MessageValue, |
| 8 | PromiseResponseWrapper, |
| 9 | Task |
| 10 | } from '../utility-types' |
| 11 | import { |
| 12 | DEFAULT_TASK_NAME, |
| 13 | DEFAULT_WORKER_CHOICE_STRATEGY_OPTIONS, |
| 14 | EMPTY_FUNCTION, |
| 15 | average, |
| 16 | exponentialDelay, |
| 17 | isKillBehavior, |
| 18 | isPlainObject, |
| 19 | max, |
| 20 | median, |
| 21 | min, |
| 22 | round, |
| 23 | sleep |
| 24 | } from '../utils' |
| 25 | import { KillBehaviors } from '../worker/worker-options' |
| 26 | import type { TaskFunction } from '../worker/task-functions' |
| 27 | import { |
| 28 | type IPool, |
| 29 | PoolEvents, |
| 30 | type PoolInfo, |
| 31 | type PoolOptions, |
| 32 | type PoolType, |
| 33 | PoolTypes, |
| 34 | type TasksQueueOptions |
| 35 | } from './pool' |
| 36 | import type { |
| 37 | IWorker, |
| 38 | IWorkerNode, |
| 39 | TaskStatistics, |
| 40 | WorkerInfo, |
| 41 | WorkerNodeEventDetail, |
| 42 | WorkerType, |
| 43 | WorkerUsage |
| 44 | } from './worker' |
| 45 | import { |
| 46 | type MeasurementStatisticsRequirements, |
| 47 | Measurements, |
| 48 | WorkerChoiceStrategies, |
| 49 | type WorkerChoiceStrategy, |
| 50 | type WorkerChoiceStrategyOptions |
| 51 | } from './selection-strategies/selection-strategies-types' |
| 52 | import { WorkerChoiceStrategyContext } from './selection-strategies/worker-choice-strategy-context' |
| 53 | import { version } from './version' |
| 54 | import { WorkerNode } from './worker-node' |
| 55 | import { |
| 56 | checkFilePath, |
| 57 | checkValidTasksQueueOptions, |
| 58 | checkValidWorkerChoiceStrategy, |
| 59 | updateMeasurementStatistics |
| 60 | } from './utils' |
| 61 | |
| 62 | /** |
| 63 | * Base class that implements some shared logic for all poolifier pools. |
| 64 | * |
| 65 | * @typeParam Worker - Type of worker which manages this pool. |
| 66 | * @typeParam Data - Type of data sent to the worker. This can only be structured-cloneable data. |
| 67 | * @typeParam Response - Type of execution response. This can only be structured-cloneable data. |
| 68 | */ |
| 69 | export abstract class AbstractPool< |
| 70 | Worker extends IWorker, |
| 71 | Data = unknown, |
| 72 | Response = unknown |
| 73 | > implements IPool<Worker, Data, Response> { |
| 74 | /** @inheritDoc */ |
| 75 | public readonly workerNodes: Array<IWorkerNode<Worker, Data>> = [] |
| 76 | |
| 77 | /** @inheritDoc */ |
| 78 | public emitter?: EventEmitterAsyncResource |
| 79 | |
| 80 | /** |
| 81 | * Dynamic pool maximum size property placeholder. |
| 82 | */ |
| 83 | protected readonly max?: number |
| 84 | |
| 85 | /** |
| 86 | * The task execution response promise map: |
| 87 | * - `key`: The message id of each submitted task. |
| 88 | * - `value`: An object that contains the worker, the execution response promise resolve and reject callbacks. |
| 89 | * |
| 90 | * When we receive a message from the worker, we get a map entry with the promise resolve/reject bound to the message id. |
| 91 | */ |
| 92 | protected promiseResponseMap: Map<string, PromiseResponseWrapper<Response>> = |
| 93 | new Map<string, PromiseResponseWrapper<Response>>() |
| 94 | |
| 95 | /** |
| 96 | * Worker choice strategy context referencing a worker choice algorithm implementation. |
| 97 | */ |
| 98 | protected workerChoiceStrategyContext: WorkerChoiceStrategyContext< |
| 99 | Worker, |
| 100 | Data, |
| 101 | Response |
| 102 | > |
| 103 | |
| 104 | /** |
| 105 | * The task functions added at runtime map: |
| 106 | * - `key`: The task function name. |
| 107 | * - `value`: The task function itself. |
| 108 | */ |
| 109 | private readonly taskFunctions: Map<string, TaskFunction<Data, Response>> |
| 110 | |
| 111 | /** |
| 112 | * Whether the pool is started or not. |
| 113 | */ |
| 114 | private started: boolean |
| 115 | /** |
| 116 | * Whether the pool is starting or not. |
| 117 | */ |
| 118 | private starting: boolean |
| 119 | /** |
| 120 | * Whether the pool is destroying or not. |
| 121 | */ |
| 122 | private destroying: boolean |
| 123 | /** |
| 124 | * Whether the pool ready event has been emitted or not. |
| 125 | */ |
| 126 | private readyEventEmitted: boolean |
| 127 | /** |
| 128 | * The start timestamp of the pool. |
| 129 | */ |
| 130 | private readonly startTimestamp |
| 131 | |
| 132 | /** |
| 133 | * Constructs a new poolifier pool. |
| 134 | * |
| 135 | * @param numberOfWorkers - Number of workers that this pool should manage. |
| 136 | * @param filePath - Path to the worker file. |
| 137 | * @param opts - Options for the pool. |
| 138 | */ |
| 139 | public constructor ( |
| 140 | protected readonly numberOfWorkers: number, |
| 141 | protected readonly filePath: string, |
| 142 | protected readonly opts: PoolOptions<Worker> |
| 143 | ) { |
| 144 | if (!this.isMain()) { |
| 145 | throw new Error( |
| 146 | 'Cannot start a pool from a worker with the same type as the pool' |
| 147 | ) |
| 148 | } |
| 149 | checkFilePath(this.filePath) |
| 150 | this.checkNumberOfWorkers(this.numberOfWorkers) |
| 151 | this.checkPoolOptions(this.opts) |
| 152 | |
| 153 | this.chooseWorkerNode = this.chooseWorkerNode.bind(this) |
| 154 | this.executeTask = this.executeTask.bind(this) |
| 155 | this.enqueueTask = this.enqueueTask.bind(this) |
| 156 | |
| 157 | if (this.opts.enableEvents === true) { |
| 158 | this.initializeEventEmitter() |
| 159 | } |
| 160 | this.workerChoiceStrategyContext = new WorkerChoiceStrategyContext< |
| 161 | Worker, |
| 162 | Data, |
| 163 | Response |
| 164 | >( |
| 165 | this, |
| 166 | this.opts.workerChoiceStrategy, |
| 167 | this.opts.workerChoiceStrategyOptions |
| 168 | ) |
| 169 | |
| 170 | this.setupHook() |
| 171 | |
| 172 | this.taskFunctions = new Map<string, TaskFunction<Data, Response>>() |
| 173 | |
| 174 | this.started = false |
| 175 | this.starting = false |
| 176 | this.destroying = false |
| 177 | this.readyEventEmitted = false |
| 178 | if (this.opts.startWorkers === true) { |
| 179 | this.start() |
| 180 | } |
| 181 | |
| 182 | this.startTimestamp = performance.now() |
| 183 | } |
| 184 | |
| 185 | private checkNumberOfWorkers (numberOfWorkers: number): void { |
| 186 | if (numberOfWorkers == null) { |
| 187 | throw new Error( |
| 188 | 'Cannot instantiate a pool without specifying the number of workers' |
| 189 | ) |
| 190 | } else if (!Number.isSafeInteger(numberOfWorkers)) { |
| 191 | throw new TypeError( |
| 192 | 'Cannot instantiate a pool with a non safe integer number of workers' |
| 193 | ) |
| 194 | } else if (numberOfWorkers < 0) { |
| 195 | throw new RangeError( |
| 196 | 'Cannot instantiate a pool with a negative number of workers' |
| 197 | ) |
| 198 | } else if (this.type === PoolTypes.fixed && numberOfWorkers === 0) { |
| 199 | throw new RangeError('Cannot instantiate a fixed pool with zero worker') |
| 200 | } |
| 201 | } |
| 202 | |
| 203 | private checkPoolOptions (opts: PoolOptions<Worker>): void { |
| 204 | if (isPlainObject(opts)) { |
| 205 | this.opts.startWorkers = opts.startWorkers ?? true |
| 206 | checkValidWorkerChoiceStrategy( |
| 207 | opts.workerChoiceStrategy as WorkerChoiceStrategy |
| 208 | ) |
| 209 | this.opts.workerChoiceStrategy = |
| 210 | opts.workerChoiceStrategy ?? WorkerChoiceStrategies.ROUND_ROBIN |
| 211 | this.checkValidWorkerChoiceStrategyOptions( |
| 212 | opts.workerChoiceStrategyOptions as WorkerChoiceStrategyOptions |
| 213 | ) |
| 214 | this.opts.workerChoiceStrategyOptions = { |
| 215 | ...DEFAULT_WORKER_CHOICE_STRATEGY_OPTIONS, |
| 216 | ...opts.workerChoiceStrategyOptions |
| 217 | } |
| 218 | this.opts.restartWorkerOnError = opts.restartWorkerOnError ?? true |
| 219 | this.opts.enableEvents = opts.enableEvents ?? true |
| 220 | this.opts.enableTasksQueue = opts.enableTasksQueue ?? false |
| 221 | if (this.opts.enableTasksQueue) { |
| 222 | checkValidTasksQueueOptions(opts.tasksQueueOptions as TasksQueueOptions) |
| 223 | this.opts.tasksQueueOptions = this.buildTasksQueueOptions( |
| 224 | opts.tasksQueueOptions as TasksQueueOptions |
| 225 | ) |
| 226 | } |
| 227 | } else { |
| 228 | throw new TypeError('Invalid pool options: must be a plain object') |
| 229 | } |
| 230 | } |
| 231 | |
| 232 | private checkValidWorkerChoiceStrategyOptions ( |
| 233 | workerChoiceStrategyOptions: WorkerChoiceStrategyOptions |
| 234 | ): void { |
| 235 | if ( |
| 236 | workerChoiceStrategyOptions != null && |
| 237 | !isPlainObject(workerChoiceStrategyOptions) |
| 238 | ) { |
| 239 | throw new TypeError( |
| 240 | 'Invalid worker choice strategy options: must be a plain object' |
| 241 | ) |
| 242 | } |
| 243 | if ( |
| 244 | workerChoiceStrategyOptions?.retries != null && |
| 245 | !Number.isSafeInteger(workerChoiceStrategyOptions.retries) |
| 246 | ) { |
| 247 | throw new TypeError( |
| 248 | 'Invalid worker choice strategy options: retries must be an integer' |
| 249 | ) |
| 250 | } |
| 251 | if ( |
| 252 | workerChoiceStrategyOptions?.retries != null && |
| 253 | workerChoiceStrategyOptions.retries < 0 |
| 254 | ) { |
| 255 | throw new RangeError( |
| 256 | `Invalid worker choice strategy options: retries '${workerChoiceStrategyOptions.retries}' must be greater or equal than zero` |
| 257 | ) |
| 258 | } |
| 259 | if ( |
| 260 | workerChoiceStrategyOptions?.weights != null && |
| 261 | Object.keys(workerChoiceStrategyOptions.weights).length !== this.maxSize |
| 262 | ) { |
| 263 | throw new Error( |
| 264 | 'Invalid worker choice strategy options: must have a weight for each worker node' |
| 265 | ) |
| 266 | } |
| 267 | if ( |
| 268 | workerChoiceStrategyOptions?.measurement != null && |
| 269 | !Object.values(Measurements).includes( |
| 270 | workerChoiceStrategyOptions.measurement |
| 271 | ) |
| 272 | ) { |
| 273 | throw new Error( |
| 274 | `Invalid worker choice strategy options: invalid measurement '${workerChoiceStrategyOptions.measurement}'` |
| 275 | ) |
| 276 | } |
| 277 | } |
| 278 | |
| 279 | private initializeEventEmitter (): void { |
| 280 | this.emitter = new EventEmitterAsyncResource({ |
| 281 | name: `poolifier:${this.type}-${this.worker}-pool` |
| 282 | }) |
| 283 | } |
| 284 | |
| 285 | /** @inheritDoc */ |
| 286 | public get info (): PoolInfo { |
| 287 | return { |
| 288 | version, |
| 289 | type: this.type, |
| 290 | worker: this.worker, |
| 291 | started: this.started, |
| 292 | ready: this.ready, |
| 293 | strategy: this.opts.workerChoiceStrategy as WorkerChoiceStrategy, |
| 294 | minSize: this.minSize, |
| 295 | maxSize: this.maxSize, |
| 296 | ...(this.workerChoiceStrategyContext.getTaskStatisticsRequirements() |
| 297 | .runTime.aggregate && |
| 298 | this.workerChoiceStrategyContext.getTaskStatisticsRequirements() |
| 299 | .waitTime.aggregate && { utilization: round(this.utilization) }), |
| 300 | workerNodes: this.workerNodes.length, |
| 301 | idleWorkerNodes: this.workerNodes.reduce( |
| 302 | (accumulator, workerNode) => |
| 303 | workerNode.usage.tasks.executing === 0 |
| 304 | ? accumulator + 1 |
| 305 | : accumulator, |
| 306 | 0 |
| 307 | ), |
| 308 | busyWorkerNodes: this.workerNodes.reduce( |
| 309 | (accumulator, _workerNode, workerNodeKey) => |
| 310 | this.isWorkerNodeBusy(workerNodeKey) ? accumulator + 1 : accumulator, |
| 311 | 0 |
| 312 | ), |
| 313 | executedTasks: this.workerNodes.reduce( |
| 314 | (accumulator, workerNode) => |
| 315 | accumulator + workerNode.usage.tasks.executed, |
| 316 | 0 |
| 317 | ), |
| 318 | executingTasks: this.workerNodes.reduce( |
| 319 | (accumulator, workerNode) => |
| 320 | accumulator + workerNode.usage.tasks.executing, |
| 321 | 0 |
| 322 | ), |
| 323 | ...(this.opts.enableTasksQueue === true && { |
| 324 | queuedTasks: this.workerNodes.reduce( |
| 325 | (accumulator, workerNode) => |
| 326 | accumulator + workerNode.usage.tasks.queued, |
| 327 | 0 |
| 328 | ) |
| 329 | }), |
| 330 | ...(this.opts.enableTasksQueue === true && { |
| 331 | maxQueuedTasks: this.workerNodes.reduce( |
| 332 | (accumulator, workerNode) => |
| 333 | accumulator + (workerNode.usage.tasks?.maxQueued ?? 0), |
| 334 | 0 |
| 335 | ) |
| 336 | }), |
| 337 | ...(this.opts.enableTasksQueue === true && { |
| 338 | backPressure: this.hasBackPressure() |
| 339 | }), |
| 340 | ...(this.opts.enableTasksQueue === true && { |
| 341 | stolenTasks: this.workerNodes.reduce( |
| 342 | (accumulator, workerNode) => |
| 343 | accumulator + workerNode.usage.tasks.stolen, |
| 344 | 0 |
| 345 | ) |
| 346 | }), |
| 347 | failedTasks: this.workerNodes.reduce( |
| 348 | (accumulator, workerNode) => |
| 349 | accumulator + workerNode.usage.tasks.failed, |
| 350 | 0 |
| 351 | ), |
| 352 | ...(this.workerChoiceStrategyContext.getTaskStatisticsRequirements() |
| 353 | .runTime.aggregate && { |
| 354 | runTime: { |
| 355 | minimum: round( |
| 356 | min( |
| 357 | ...this.workerNodes.map( |
| 358 | workerNode => workerNode.usage.runTime?.minimum ?? Infinity |
| 359 | ) |
| 360 | ) |
| 361 | ), |
| 362 | maximum: round( |
| 363 | max( |
| 364 | ...this.workerNodes.map( |
| 365 | workerNode => workerNode.usage.runTime?.maximum ?? -Infinity |
| 366 | ) |
| 367 | ) |
| 368 | ), |
| 369 | ...(this.workerChoiceStrategyContext.getTaskStatisticsRequirements() |
| 370 | .runTime.average && { |
| 371 | average: round( |
| 372 | average( |
| 373 | this.workerNodes.reduce<number[]>( |
| 374 | (accumulator, workerNode) => |
| 375 | accumulator.concat(workerNode.usage.runTime.history), |
| 376 | [] |
| 377 | ) |
| 378 | ) |
| 379 | ) |
| 380 | }), |
| 381 | ...(this.workerChoiceStrategyContext.getTaskStatisticsRequirements() |
| 382 | .runTime.median && { |
| 383 | median: round( |
| 384 | median( |
| 385 | this.workerNodes.reduce<number[]>( |
| 386 | (accumulator, workerNode) => |
| 387 | accumulator.concat(workerNode.usage.runTime.history), |
| 388 | [] |
| 389 | ) |
| 390 | ) |
| 391 | ) |
| 392 | }) |
| 393 | } |
| 394 | }), |
| 395 | ...(this.workerChoiceStrategyContext.getTaskStatisticsRequirements() |
| 396 | .waitTime.aggregate && { |
| 397 | waitTime: { |
| 398 | minimum: round( |
| 399 | min( |
| 400 | ...this.workerNodes.map( |
| 401 | workerNode => workerNode.usage.waitTime?.minimum ?? Infinity |
| 402 | ) |
| 403 | ) |
| 404 | ), |
| 405 | maximum: round( |
| 406 | max( |
| 407 | ...this.workerNodes.map( |
| 408 | workerNode => workerNode.usage.waitTime?.maximum ?? -Infinity |
| 409 | ) |
| 410 | ) |
| 411 | ), |
| 412 | ...(this.workerChoiceStrategyContext.getTaskStatisticsRequirements() |
| 413 | .waitTime.average && { |
| 414 | average: round( |
| 415 | average( |
| 416 | this.workerNodes.reduce<number[]>( |
| 417 | (accumulator, workerNode) => |
| 418 | accumulator.concat(workerNode.usage.waitTime.history), |
| 419 | [] |
| 420 | ) |
| 421 | ) |
| 422 | ) |
| 423 | }), |
| 424 | ...(this.workerChoiceStrategyContext.getTaskStatisticsRequirements() |
| 425 | .waitTime.median && { |
| 426 | median: round( |
| 427 | median( |
| 428 | this.workerNodes.reduce<number[]>( |
| 429 | (accumulator, workerNode) => |
| 430 | accumulator.concat(workerNode.usage.waitTime.history), |
| 431 | [] |
| 432 | ) |
| 433 | ) |
| 434 | ) |
| 435 | }) |
| 436 | } |
| 437 | }) |
| 438 | } |
| 439 | } |
| 440 | |
| 441 | /** |
| 442 | * The pool readiness boolean status. |
| 443 | */ |
| 444 | private get ready (): boolean { |
| 445 | return ( |
| 446 | this.workerNodes.reduce( |
| 447 | (accumulator, workerNode) => |
| 448 | !workerNode.info.dynamic && workerNode.info.ready |
| 449 | ? accumulator + 1 |
| 450 | : accumulator, |
| 451 | 0 |
| 452 | ) >= this.minSize |
| 453 | ) |
| 454 | } |
| 455 | |
| 456 | /** |
| 457 | * The approximate pool utilization. |
| 458 | * |
| 459 | * @returns The pool utilization. |
| 460 | */ |
| 461 | private get utilization (): number { |
| 462 | const poolTimeCapacity = |
| 463 | (performance.now() - this.startTimestamp) * this.maxSize |
| 464 | const totalTasksRunTime = this.workerNodes.reduce( |
| 465 | (accumulator, workerNode) => |
| 466 | accumulator + (workerNode.usage.runTime?.aggregate ?? 0), |
| 467 | 0 |
| 468 | ) |
| 469 | const totalTasksWaitTime = this.workerNodes.reduce( |
| 470 | (accumulator, workerNode) => |
| 471 | accumulator + (workerNode.usage.waitTime?.aggregate ?? 0), |
| 472 | 0 |
| 473 | ) |
| 474 | return (totalTasksRunTime + totalTasksWaitTime) / poolTimeCapacity |
| 475 | } |
| 476 | |
| 477 | /** |
| 478 | * The pool type. |
| 479 | * |
| 480 | * If it is `'dynamic'`, it provides the `max` property. |
| 481 | */ |
| 482 | protected abstract get type (): PoolType |
| 483 | |
| 484 | /** |
| 485 | * The worker type. |
| 486 | */ |
| 487 | protected abstract get worker (): WorkerType |
| 488 | |
| 489 | /** |
| 490 | * The pool minimum size. |
| 491 | */ |
| 492 | protected get minSize (): number { |
| 493 | return this.numberOfWorkers |
| 494 | } |
| 495 | |
| 496 | /** |
| 497 | * The pool maximum size. |
| 498 | */ |
| 499 | protected get maxSize (): number { |
| 500 | return this.max ?? this.numberOfWorkers |
| 501 | } |
| 502 | |
| 503 | /** |
| 504 | * Checks if the worker id sent in the received message from a worker is valid. |
| 505 | * |
| 506 | * @param message - The received message. |
| 507 | * @throws {@link https://nodejs.org/api/errors.html#class-error} If the worker id is invalid. |
| 508 | */ |
| 509 | private checkMessageWorkerId (message: MessageValue<Data | Response>): void { |
| 510 | if (message.workerId == null) { |
| 511 | throw new Error('Worker message received without worker id') |
| 512 | } else if (this.getWorkerNodeKeyByWorkerId(message.workerId) === -1) { |
| 513 | throw new Error( |
| 514 | `Worker message received from unknown worker '${message.workerId}'` |
| 515 | ) |
| 516 | } |
| 517 | } |
| 518 | |
| 519 | /** |
| 520 | * Gets the given worker its worker node key. |
| 521 | * |
| 522 | * @param worker - The worker. |
| 523 | * @returns The worker node key if found in the pool worker nodes, `-1` otherwise. |
| 524 | */ |
| 525 | private getWorkerNodeKeyByWorker (worker: Worker): number { |
| 526 | return this.workerNodes.findIndex( |
| 527 | workerNode => workerNode.worker === worker |
| 528 | ) |
| 529 | } |
| 530 | |
| 531 | /** |
| 532 | * Gets the worker node key given its worker id. |
| 533 | * |
| 534 | * @param workerId - The worker id. |
| 535 | * @returns The worker node key if the worker id is found in the pool worker nodes, `-1` otherwise. |
| 536 | */ |
| 537 | private getWorkerNodeKeyByWorkerId (workerId: number | undefined): number { |
| 538 | return this.workerNodes.findIndex( |
| 539 | workerNode => workerNode.info.id === workerId |
| 540 | ) |
| 541 | } |
| 542 | |
| 543 | /** @inheritDoc */ |
| 544 | public setWorkerChoiceStrategy ( |
| 545 | workerChoiceStrategy: WorkerChoiceStrategy, |
| 546 | workerChoiceStrategyOptions?: WorkerChoiceStrategyOptions |
| 547 | ): void { |
| 548 | checkValidWorkerChoiceStrategy(workerChoiceStrategy) |
| 549 | this.opts.workerChoiceStrategy = workerChoiceStrategy |
| 550 | this.workerChoiceStrategyContext.setWorkerChoiceStrategy( |
| 551 | this.opts.workerChoiceStrategy |
| 552 | ) |
| 553 | if (workerChoiceStrategyOptions != null) { |
| 554 | this.setWorkerChoiceStrategyOptions(workerChoiceStrategyOptions) |
| 555 | } |
| 556 | for (const [workerNodeKey, workerNode] of this.workerNodes.entries()) { |
| 557 | workerNode.resetUsage() |
| 558 | this.sendStatisticsMessageToWorker(workerNodeKey) |
| 559 | } |
| 560 | } |
| 561 | |
| 562 | /** @inheritDoc */ |
| 563 | public setWorkerChoiceStrategyOptions ( |
| 564 | workerChoiceStrategyOptions: WorkerChoiceStrategyOptions |
| 565 | ): void { |
| 566 | this.checkValidWorkerChoiceStrategyOptions(workerChoiceStrategyOptions) |
| 567 | this.opts.workerChoiceStrategyOptions = { |
| 568 | ...DEFAULT_WORKER_CHOICE_STRATEGY_OPTIONS, |
| 569 | ...workerChoiceStrategyOptions |
| 570 | } |
| 571 | this.workerChoiceStrategyContext.setOptions( |
| 572 | this.opts.workerChoiceStrategyOptions |
| 573 | ) |
| 574 | } |
| 575 | |
| 576 | /** @inheritDoc */ |
| 577 | public enableTasksQueue ( |
| 578 | enable: boolean, |
| 579 | tasksQueueOptions?: TasksQueueOptions |
| 580 | ): void { |
| 581 | if (this.opts.enableTasksQueue === true && !enable) { |
| 582 | this.unsetTaskStealing() |
| 583 | this.unsetTasksStealingOnBackPressure() |
| 584 | this.flushTasksQueues() |
| 585 | } |
| 586 | this.opts.enableTasksQueue = enable |
| 587 | this.setTasksQueueOptions(tasksQueueOptions as TasksQueueOptions) |
| 588 | } |
| 589 | |
| 590 | /** @inheritDoc */ |
| 591 | public setTasksQueueOptions (tasksQueueOptions: TasksQueueOptions): void { |
| 592 | if (this.opts.enableTasksQueue === true) { |
| 593 | checkValidTasksQueueOptions(tasksQueueOptions) |
| 594 | this.opts.tasksQueueOptions = |
| 595 | this.buildTasksQueueOptions(tasksQueueOptions) |
| 596 | this.setTasksQueueSize(this.opts.tasksQueueOptions.size as number) |
| 597 | if (this.opts.tasksQueueOptions.taskStealing === true) { |
| 598 | this.unsetTaskStealing() |
| 599 | this.setTaskStealing() |
| 600 | } else { |
| 601 | this.unsetTaskStealing() |
| 602 | } |
| 603 | if (this.opts.tasksQueueOptions.tasksStealingOnBackPressure === true) { |
| 604 | this.unsetTasksStealingOnBackPressure() |
| 605 | this.setTasksStealingOnBackPressure() |
| 606 | } else { |
| 607 | this.unsetTasksStealingOnBackPressure() |
| 608 | } |
| 609 | } else if (this.opts.tasksQueueOptions != null) { |
| 610 | delete this.opts.tasksQueueOptions |
| 611 | } |
| 612 | } |
| 613 | |
| 614 | private buildTasksQueueOptions ( |
| 615 | tasksQueueOptions: TasksQueueOptions |
| 616 | ): TasksQueueOptions { |
| 617 | return { |
| 618 | ...{ |
| 619 | size: Math.pow(this.maxSize, 2), |
| 620 | concurrency: 1, |
| 621 | taskStealing: true, |
| 622 | tasksStealingOnBackPressure: true |
| 623 | }, |
| 624 | ...tasksQueueOptions |
| 625 | } |
| 626 | } |
| 627 | |
| 628 | private setTasksQueueSize (size: number): void { |
| 629 | for (const workerNode of this.workerNodes) { |
| 630 | workerNode.tasksQueueBackPressureSize = size |
| 631 | } |
| 632 | } |
| 633 | |
| 634 | private setTaskStealing (): void { |
| 635 | for (const [workerNodeKey] of this.workerNodes.entries()) { |
| 636 | this.workerNodes[workerNodeKey].on( |
| 637 | 'idleWorkerNode', |
| 638 | this.handleIdleWorkerNodeEvent |
| 639 | ) |
| 640 | } |
| 641 | } |
| 642 | |
| 643 | private unsetTaskStealing (): void { |
| 644 | for (const [workerNodeKey] of this.workerNodes.entries()) { |
| 645 | this.workerNodes[workerNodeKey].off( |
| 646 | 'idleWorkerNode', |
| 647 | this.handleIdleWorkerNodeEvent |
| 648 | ) |
| 649 | } |
| 650 | } |
| 651 | |
| 652 | private setTasksStealingOnBackPressure (): void { |
| 653 | for (const [workerNodeKey] of this.workerNodes.entries()) { |
| 654 | this.workerNodes[workerNodeKey].on( |
| 655 | 'backPressure', |
| 656 | this.handleBackPressureEvent |
| 657 | ) |
| 658 | } |
| 659 | } |
| 660 | |
| 661 | private unsetTasksStealingOnBackPressure (): void { |
| 662 | for (const [workerNodeKey] of this.workerNodes.entries()) { |
| 663 | this.workerNodes[workerNodeKey].off( |
| 664 | 'backPressure', |
| 665 | this.handleBackPressureEvent |
| 666 | ) |
| 667 | } |
| 668 | } |
| 669 | |
| 670 | /** |
| 671 | * Whether the pool is full or not. |
| 672 | * |
| 673 | * The pool filling boolean status. |
| 674 | */ |
| 675 | protected get full (): boolean { |
| 676 | return this.workerNodes.length >= this.maxSize |
| 677 | } |
| 678 | |
| 679 | /** |
| 680 | * Whether the pool is busy or not. |
| 681 | * |
| 682 | * The pool busyness boolean status. |
| 683 | */ |
| 684 | protected abstract get busy (): boolean |
| 685 | |
| 686 | /** |
| 687 | * Whether worker nodes are executing concurrently their tasks quota or not. |
| 688 | * |
| 689 | * @returns Worker nodes busyness boolean status. |
| 690 | */ |
| 691 | protected internalBusy (): boolean { |
| 692 | if (this.opts.enableTasksQueue === true) { |
| 693 | return ( |
| 694 | this.workerNodes.findIndex( |
| 695 | workerNode => |
| 696 | workerNode.info.ready && |
| 697 | workerNode.usage.tasks.executing < |
| 698 | (this.opts.tasksQueueOptions?.concurrency as number) |
| 699 | ) === -1 |
| 700 | ) |
| 701 | } |
| 702 | return ( |
| 703 | this.workerNodes.findIndex( |
| 704 | workerNode => |
| 705 | workerNode.info.ready && workerNode.usage.tasks.executing === 0 |
| 706 | ) === -1 |
| 707 | ) |
| 708 | } |
| 709 | |
| 710 | private isWorkerNodeBusy (workerNodeKey: number): boolean { |
| 711 | if (this.opts.enableTasksQueue === true) { |
| 712 | return ( |
| 713 | this.workerNodes[workerNodeKey].usage.tasks.executing >= |
| 714 | (this.opts.tasksQueueOptions?.concurrency as number) |
| 715 | ) |
| 716 | } |
| 717 | return this.workerNodes[workerNodeKey].usage.tasks.executing > 0 |
| 718 | } |
| 719 | |
| 720 | private async sendTaskFunctionOperationToWorker ( |
| 721 | workerNodeKey: number, |
| 722 | message: MessageValue<Data> |
| 723 | ): Promise<boolean> { |
| 724 | return await new Promise<boolean>((resolve, reject) => { |
| 725 | const taskFunctionOperationListener = ( |
| 726 | message: MessageValue<Response> |
| 727 | ): void => { |
| 728 | this.checkMessageWorkerId(message) |
| 729 | const workerId = this.getWorkerInfo(workerNodeKey).id as number |
| 730 | if ( |
| 731 | message.taskFunctionOperationStatus != null && |
| 732 | message.workerId === workerId |
| 733 | ) { |
| 734 | if (message.taskFunctionOperationStatus) { |
| 735 | resolve(true) |
| 736 | } else if (!message.taskFunctionOperationStatus) { |
| 737 | reject( |
| 738 | new Error( |
| 739 | `Task function operation '${ |
| 740 | message.taskFunctionOperation as string |
| 741 | }' failed on worker ${message.workerId} with error: '${ |
| 742 | message.workerError?.message as string |
| 743 | }'` |
| 744 | ) |
| 745 | ) |
| 746 | } |
| 747 | this.deregisterWorkerMessageListener( |
| 748 | this.getWorkerNodeKeyByWorkerId(message.workerId), |
| 749 | taskFunctionOperationListener |
| 750 | ) |
| 751 | } |
| 752 | } |
| 753 | this.registerWorkerMessageListener( |
| 754 | workerNodeKey, |
| 755 | taskFunctionOperationListener |
| 756 | ) |
| 757 | this.sendToWorker(workerNodeKey, message) |
| 758 | }) |
| 759 | } |
| 760 | |
| 761 | private async sendTaskFunctionOperationToWorkers ( |
| 762 | message: MessageValue<Data> |
| 763 | ): Promise<boolean> { |
| 764 | return await new Promise<boolean>((resolve, reject) => { |
| 765 | const responsesReceived = new Array<MessageValue<Response>>() |
| 766 | const taskFunctionOperationsListener = ( |
| 767 | message: MessageValue<Response> |
| 768 | ): void => { |
| 769 | this.checkMessageWorkerId(message) |
| 770 | if (message.taskFunctionOperationStatus != null) { |
| 771 | responsesReceived.push(message) |
| 772 | if (responsesReceived.length === this.workerNodes.length) { |
| 773 | if ( |
| 774 | responsesReceived.every( |
| 775 | message => message.taskFunctionOperationStatus === true |
| 776 | ) |
| 777 | ) { |
| 778 | resolve(true) |
| 779 | } else if ( |
| 780 | responsesReceived.some( |
| 781 | message => message.taskFunctionOperationStatus === false |
| 782 | ) |
| 783 | ) { |
| 784 | const errorResponse = responsesReceived.find( |
| 785 | response => response.taskFunctionOperationStatus === false |
| 786 | ) |
| 787 | reject( |
| 788 | new Error( |
| 789 | `Task function operation '${ |
| 790 | message.taskFunctionOperation as string |
| 791 | }' failed on worker ${ |
| 792 | errorResponse?.workerId as number |
| 793 | } with error: '${ |
| 794 | errorResponse?.workerError?.message as string |
| 795 | }'` |
| 796 | ) |
| 797 | ) |
| 798 | } |
| 799 | this.deregisterWorkerMessageListener( |
| 800 | this.getWorkerNodeKeyByWorkerId(message.workerId), |
| 801 | taskFunctionOperationsListener |
| 802 | ) |
| 803 | } |
| 804 | } |
| 805 | } |
| 806 | for (const [workerNodeKey] of this.workerNodes.entries()) { |
| 807 | this.registerWorkerMessageListener( |
| 808 | workerNodeKey, |
| 809 | taskFunctionOperationsListener |
| 810 | ) |
| 811 | this.sendToWorker(workerNodeKey, message) |
| 812 | } |
| 813 | }) |
| 814 | } |
| 815 | |
| 816 | /** @inheritDoc */ |
| 817 | public hasTaskFunction (name: string): boolean { |
| 818 | for (const workerNode of this.workerNodes) { |
| 819 | if ( |
| 820 | Array.isArray(workerNode.info.taskFunctionNames) && |
| 821 | workerNode.info.taskFunctionNames.includes(name) |
| 822 | ) { |
| 823 | return true |
| 824 | } |
| 825 | } |
| 826 | return false |
| 827 | } |
| 828 | |
| 829 | /** @inheritDoc */ |
| 830 | public async addTaskFunction ( |
| 831 | name: string, |
| 832 | fn: TaskFunction<Data, Response> |
| 833 | ): Promise<boolean> { |
| 834 | if (typeof name !== 'string') { |
| 835 | throw new TypeError('name argument must be a string') |
| 836 | } |
| 837 | if (typeof name === 'string' && name.trim().length === 0) { |
| 838 | throw new TypeError('name argument must not be an empty string') |
| 839 | } |
| 840 | if (typeof fn !== 'function') { |
| 841 | throw new TypeError('fn argument must be a function') |
| 842 | } |
| 843 | const opResult = await this.sendTaskFunctionOperationToWorkers({ |
| 844 | taskFunctionOperation: 'add', |
| 845 | taskFunctionName: name, |
| 846 | taskFunction: fn.toString() |
| 847 | }) |
| 848 | this.taskFunctions.set(name, fn) |
| 849 | return opResult |
| 850 | } |
| 851 | |
| 852 | /** @inheritDoc */ |
| 853 | public async removeTaskFunction (name: string): Promise<boolean> { |
| 854 | if (!this.taskFunctions.has(name)) { |
| 855 | throw new Error( |
| 856 | 'Cannot remove a task function not handled on the pool side' |
| 857 | ) |
| 858 | } |
| 859 | const opResult = await this.sendTaskFunctionOperationToWorkers({ |
| 860 | taskFunctionOperation: 'remove', |
| 861 | taskFunctionName: name |
| 862 | }) |
| 863 | this.deleteTaskFunctionWorkerUsages(name) |
| 864 | this.taskFunctions.delete(name) |
| 865 | return opResult |
| 866 | } |
| 867 | |
| 868 | /** @inheritDoc */ |
| 869 | public listTaskFunctionNames (): string[] { |
| 870 | for (const workerNode of this.workerNodes) { |
| 871 | if ( |
| 872 | Array.isArray(workerNode.info.taskFunctionNames) && |
| 873 | workerNode.info.taskFunctionNames.length > 0 |
| 874 | ) { |
| 875 | return workerNode.info.taskFunctionNames |
| 876 | } |
| 877 | } |
| 878 | return [] |
| 879 | } |
| 880 | |
| 881 | /** @inheritDoc */ |
| 882 | public async setDefaultTaskFunction (name: string): Promise<boolean> { |
| 883 | return await this.sendTaskFunctionOperationToWorkers({ |
| 884 | taskFunctionOperation: 'default', |
| 885 | taskFunctionName: name |
| 886 | }) |
| 887 | } |
| 888 | |
| 889 | private deleteTaskFunctionWorkerUsages (name: string): void { |
| 890 | for (const workerNode of this.workerNodes) { |
| 891 | workerNode.deleteTaskFunctionWorkerUsage(name) |
| 892 | } |
| 893 | } |
| 894 | |
| 895 | private shallExecuteTask (workerNodeKey: number): boolean { |
| 896 | return ( |
| 897 | this.tasksQueueSize(workerNodeKey) === 0 && |
| 898 | this.workerNodes[workerNodeKey].usage.tasks.executing < |
| 899 | (this.opts.tasksQueueOptions?.concurrency as number) |
| 900 | ) |
| 901 | } |
| 902 | |
| 903 | /** @inheritDoc */ |
| 904 | public async execute ( |
| 905 | data?: Data, |
| 906 | name?: string, |
| 907 | transferList?: TransferListItem[] |
| 908 | ): Promise<Response> { |
| 909 | return await new Promise<Response>((resolve, reject) => { |
| 910 | if (!this.started) { |
| 911 | reject(new Error('Cannot execute a task on not started pool')) |
| 912 | return |
| 913 | } |
| 914 | if (this.destroying) { |
| 915 | reject(new Error('Cannot execute a task on destroying pool')) |
| 916 | return |
| 917 | } |
| 918 | if (name != null && typeof name !== 'string') { |
| 919 | reject(new TypeError('name argument must be a string')) |
| 920 | return |
| 921 | } |
| 922 | if ( |
| 923 | name != null && |
| 924 | typeof name === 'string' && |
| 925 | name.trim().length === 0 |
| 926 | ) { |
| 927 | reject(new TypeError('name argument must not be an empty string')) |
| 928 | return |
| 929 | } |
| 930 | if (transferList != null && !Array.isArray(transferList)) { |
| 931 | reject(new TypeError('transferList argument must be an array')) |
| 932 | return |
| 933 | } |
| 934 | const timestamp = performance.now() |
| 935 | const workerNodeKey = this.chooseWorkerNode() |
| 936 | const task: Task<Data> = { |
| 937 | name: name ?? DEFAULT_TASK_NAME, |
| 938 | // eslint-disable-next-line @typescript-eslint/consistent-type-assertions |
| 939 | data: data ?? ({} as Data), |
| 940 | transferList, |
| 941 | timestamp, |
| 942 | taskId: randomUUID() |
| 943 | } |
| 944 | this.promiseResponseMap.set(task.taskId as string, { |
| 945 | resolve, |
| 946 | reject, |
| 947 | workerNodeKey, |
| 948 | ...(this.emitter != null && { |
| 949 | asyncResource: new AsyncResource('poolifier:task', { |
| 950 | triggerAsyncId: this.emitter.asyncId, |
| 951 | requireManualDestroy: true |
| 952 | }) |
| 953 | }) |
| 954 | }) |
| 955 | if ( |
| 956 | this.opts.enableTasksQueue === false || |
| 957 | (this.opts.enableTasksQueue === true && |
| 958 | this.shallExecuteTask(workerNodeKey)) |
| 959 | ) { |
| 960 | this.executeTask(workerNodeKey, task) |
| 961 | } else { |
| 962 | this.enqueueTask(workerNodeKey, task) |
| 963 | } |
| 964 | }) |
| 965 | } |
| 966 | |
| 967 | /** @inheritdoc */ |
| 968 | public start (): void { |
| 969 | if (this.started) { |
| 970 | throw new Error('Cannot start an already started pool') |
| 971 | } |
| 972 | if (this.starting) { |
| 973 | throw new Error('Cannot start an already starting pool') |
| 974 | } |
| 975 | if (this.destroying) { |
| 976 | throw new Error('Cannot start a destroying pool') |
| 977 | } |
| 978 | this.starting = true |
| 979 | while ( |
| 980 | this.workerNodes.reduce( |
| 981 | (accumulator, workerNode) => |
| 982 | !workerNode.info.dynamic ? accumulator + 1 : accumulator, |
| 983 | 0 |
| 984 | ) < this.numberOfWorkers |
| 985 | ) { |
| 986 | this.createAndSetupWorkerNode() |
| 987 | } |
| 988 | this.starting = false |
| 989 | this.started = true |
| 990 | } |
| 991 | |
| 992 | /** @inheritDoc */ |
| 993 | public async destroy (): Promise<void> { |
| 994 | if (!this.started) { |
| 995 | throw new Error('Cannot destroy an already destroyed pool') |
| 996 | } |
| 997 | if (this.starting) { |
| 998 | throw new Error('Cannot destroy an starting pool') |
| 999 | } |
| 1000 | if (this.destroying) { |
| 1001 | throw new Error('Cannot destroy an already destroying pool') |
| 1002 | } |
| 1003 | this.destroying = true |
| 1004 | await Promise.all( |
| 1005 | this.workerNodes.map(async (_workerNode, workerNodeKey) => { |
| 1006 | await this.destroyWorkerNode(workerNodeKey) |
| 1007 | }) |
| 1008 | ) |
| 1009 | this.emitter?.emit(PoolEvents.destroy, this.info) |
| 1010 | this.emitter?.emitDestroy() |
| 1011 | this.emitter?.removeAllListeners() |
| 1012 | this.readyEventEmitted = false |
| 1013 | this.destroying = false |
| 1014 | this.started = false |
| 1015 | } |
| 1016 | |
| 1017 | protected async sendKillMessageToWorker ( |
| 1018 | workerNodeKey: number |
| 1019 | ): Promise<void> { |
| 1020 | await new Promise<void>((resolve, reject) => { |
| 1021 | const killMessageListener = (message: MessageValue<Response>): void => { |
| 1022 | this.checkMessageWorkerId(message) |
| 1023 | if (message.kill === 'success') { |
| 1024 | resolve() |
| 1025 | } else if (message.kill === 'failure') { |
| 1026 | reject( |
| 1027 | new Error( |
| 1028 | `Kill message handling failed on worker ${ |
| 1029 | message.workerId as number |
| 1030 | }` |
| 1031 | ) |
| 1032 | ) |
| 1033 | } |
| 1034 | } |
| 1035 | // FIXME: should be registered only once |
| 1036 | this.registerWorkerMessageListener(workerNodeKey, killMessageListener) |
| 1037 | this.sendToWorker(workerNodeKey, { kill: true }) |
| 1038 | }) |
| 1039 | } |
| 1040 | |
| 1041 | /** |
| 1042 | * Terminates the worker node given its worker node key. |
| 1043 | * |
| 1044 | * @param workerNodeKey - The worker node key. |
| 1045 | */ |
| 1046 | protected abstract destroyWorkerNode (workerNodeKey: number): Promise<void> |
| 1047 | |
| 1048 | /** |
| 1049 | * Setup hook to execute code before worker nodes are created in the abstract constructor. |
| 1050 | * Can be overridden. |
| 1051 | * |
| 1052 | * @virtual |
| 1053 | */ |
| 1054 | protected setupHook (): void { |
| 1055 | /* Intentionally empty */ |
| 1056 | } |
| 1057 | |
| 1058 | /** |
| 1059 | * Should return whether the worker is the main worker or not. |
| 1060 | */ |
| 1061 | protected abstract isMain (): boolean |
| 1062 | |
| 1063 | /** |
| 1064 | * Hook executed before the worker task execution. |
| 1065 | * Can be overridden. |
| 1066 | * |
| 1067 | * @param workerNodeKey - The worker node key. |
| 1068 | * @param task - The task to execute. |
| 1069 | */ |
| 1070 | protected beforeTaskExecutionHook ( |
| 1071 | workerNodeKey: number, |
| 1072 | task: Task<Data> |
| 1073 | ): void { |
| 1074 | if (this.workerNodes[workerNodeKey]?.usage != null) { |
| 1075 | const workerUsage = this.workerNodes[workerNodeKey].usage |
| 1076 | ++workerUsage.tasks.executing |
| 1077 | this.updateWaitTimeWorkerUsage(workerUsage, task) |
| 1078 | } |
| 1079 | if ( |
| 1080 | this.shallUpdateTaskFunctionWorkerUsage(workerNodeKey) && |
| 1081 | this.workerNodes[workerNodeKey].getTaskFunctionWorkerUsage( |
| 1082 | task.name as string |
| 1083 | ) != null |
| 1084 | ) { |
| 1085 | const taskFunctionWorkerUsage = this.workerNodes[ |
| 1086 | workerNodeKey |
| 1087 | ].getTaskFunctionWorkerUsage(task.name as string) as WorkerUsage |
| 1088 | ++taskFunctionWorkerUsage.tasks.executing |
| 1089 | this.updateWaitTimeWorkerUsage(taskFunctionWorkerUsage, task) |
| 1090 | } |
| 1091 | } |
| 1092 | |
| 1093 | /** |
| 1094 | * Hook executed after the worker task execution. |
| 1095 | * Can be overridden. |
| 1096 | * |
| 1097 | * @param workerNodeKey - The worker node key. |
| 1098 | * @param message - The received message. |
| 1099 | */ |
| 1100 | protected afterTaskExecutionHook ( |
| 1101 | workerNodeKey: number, |
| 1102 | message: MessageValue<Response> |
| 1103 | ): void { |
| 1104 | if (this.workerNodes[workerNodeKey]?.usage != null) { |
| 1105 | const workerUsage = this.workerNodes[workerNodeKey].usage |
| 1106 | this.updateTaskStatisticsWorkerUsage(workerUsage, message) |
| 1107 | this.updateRunTimeWorkerUsage(workerUsage, message) |
| 1108 | this.updateEluWorkerUsage(workerUsage, message) |
| 1109 | } |
| 1110 | if ( |
| 1111 | this.shallUpdateTaskFunctionWorkerUsage(workerNodeKey) && |
| 1112 | this.workerNodes[workerNodeKey].getTaskFunctionWorkerUsage( |
| 1113 | message.taskPerformance?.name as string |
| 1114 | ) != null |
| 1115 | ) { |
| 1116 | const taskFunctionWorkerUsage = this.workerNodes[ |
| 1117 | workerNodeKey |
| 1118 | ].getTaskFunctionWorkerUsage( |
| 1119 | message.taskPerformance?.name as string |
| 1120 | ) as WorkerUsage |
| 1121 | this.updateTaskStatisticsWorkerUsage(taskFunctionWorkerUsage, message) |
| 1122 | this.updateRunTimeWorkerUsage(taskFunctionWorkerUsage, message) |
| 1123 | this.updateEluWorkerUsage(taskFunctionWorkerUsage, message) |
| 1124 | } |
| 1125 | } |
| 1126 | |
| 1127 | /** |
| 1128 | * Whether the worker node shall update its task function worker usage or not. |
| 1129 | * |
| 1130 | * @param workerNodeKey - The worker node key. |
| 1131 | * @returns `true` if the worker node shall update its task function worker usage, `false` otherwise. |
| 1132 | */ |
| 1133 | private shallUpdateTaskFunctionWorkerUsage (workerNodeKey: number): boolean { |
| 1134 | const workerInfo = this.getWorkerInfo(workerNodeKey) |
| 1135 | return ( |
| 1136 | workerInfo != null && |
| 1137 | Array.isArray(workerInfo.taskFunctionNames) && |
| 1138 | workerInfo.taskFunctionNames.length > 2 |
| 1139 | ) |
| 1140 | } |
| 1141 | |
| 1142 | private updateTaskStatisticsWorkerUsage ( |
| 1143 | workerUsage: WorkerUsage, |
| 1144 | message: MessageValue<Response> |
| 1145 | ): void { |
| 1146 | const workerTaskStatistics = workerUsage.tasks |
| 1147 | if ( |
| 1148 | workerTaskStatistics.executing != null && |
| 1149 | workerTaskStatistics.executing > 0 |
| 1150 | ) { |
| 1151 | --workerTaskStatistics.executing |
| 1152 | } |
| 1153 | if (message.workerError == null) { |
| 1154 | ++workerTaskStatistics.executed |
| 1155 | } else { |
| 1156 | ++workerTaskStatistics.failed |
| 1157 | } |
| 1158 | } |
| 1159 | |
| 1160 | private updateRunTimeWorkerUsage ( |
| 1161 | workerUsage: WorkerUsage, |
| 1162 | message: MessageValue<Response> |
| 1163 | ): void { |
| 1164 | if (message.workerError != null) { |
| 1165 | return |
| 1166 | } |
| 1167 | updateMeasurementStatistics( |
| 1168 | workerUsage.runTime, |
| 1169 | this.workerChoiceStrategyContext.getTaskStatisticsRequirements().runTime, |
| 1170 | message.taskPerformance?.runTime ?? 0 |
| 1171 | ) |
| 1172 | } |
| 1173 | |
| 1174 | private updateWaitTimeWorkerUsage ( |
| 1175 | workerUsage: WorkerUsage, |
| 1176 | task: Task<Data> |
| 1177 | ): void { |
| 1178 | const timestamp = performance.now() |
| 1179 | const taskWaitTime = timestamp - (task.timestamp ?? timestamp) |
| 1180 | updateMeasurementStatistics( |
| 1181 | workerUsage.waitTime, |
| 1182 | this.workerChoiceStrategyContext.getTaskStatisticsRequirements().waitTime, |
| 1183 | taskWaitTime |
| 1184 | ) |
| 1185 | } |
| 1186 | |
| 1187 | private updateEluWorkerUsage ( |
| 1188 | workerUsage: WorkerUsage, |
| 1189 | message: MessageValue<Response> |
| 1190 | ): void { |
| 1191 | if (message.workerError != null) { |
| 1192 | return |
| 1193 | } |
| 1194 | const eluTaskStatisticsRequirements: MeasurementStatisticsRequirements = |
| 1195 | this.workerChoiceStrategyContext.getTaskStatisticsRequirements().elu |
| 1196 | updateMeasurementStatistics( |
| 1197 | workerUsage.elu.active, |
| 1198 | eluTaskStatisticsRequirements, |
| 1199 | message.taskPerformance?.elu?.active ?? 0 |
| 1200 | ) |
| 1201 | updateMeasurementStatistics( |
| 1202 | workerUsage.elu.idle, |
| 1203 | eluTaskStatisticsRequirements, |
| 1204 | message.taskPerformance?.elu?.idle ?? 0 |
| 1205 | ) |
| 1206 | if (eluTaskStatisticsRequirements.aggregate) { |
| 1207 | if (message.taskPerformance?.elu != null) { |
| 1208 | if (workerUsage.elu.utilization != null) { |
| 1209 | workerUsage.elu.utilization = |
| 1210 | (workerUsage.elu.utilization + |
| 1211 | message.taskPerformance.elu.utilization) / |
| 1212 | 2 |
| 1213 | } else { |
| 1214 | workerUsage.elu.utilization = message.taskPerformance.elu.utilization |
| 1215 | } |
| 1216 | } |
| 1217 | } |
| 1218 | } |
| 1219 | |
| 1220 | /** |
| 1221 | * Chooses a worker node for the next task. |
| 1222 | * |
| 1223 | * The default worker choice strategy uses a round robin algorithm to distribute the tasks. |
| 1224 | * |
| 1225 | * @returns The chosen worker node key |
| 1226 | */ |
| 1227 | private chooseWorkerNode (): number { |
| 1228 | if (this.shallCreateDynamicWorker()) { |
| 1229 | const workerNodeKey = this.createAndSetupDynamicWorkerNode() |
| 1230 | if ( |
| 1231 | this.workerChoiceStrategyContext.getStrategyPolicy().dynamicWorkerUsage |
| 1232 | ) { |
| 1233 | return workerNodeKey |
| 1234 | } |
| 1235 | } |
| 1236 | return this.workerChoiceStrategyContext.execute() |
| 1237 | } |
| 1238 | |
| 1239 | /** |
| 1240 | * Conditions for dynamic worker creation. |
| 1241 | * |
| 1242 | * @returns Whether to create a dynamic worker or not. |
| 1243 | */ |
| 1244 | private shallCreateDynamicWorker (): boolean { |
| 1245 | return this.type === PoolTypes.dynamic && !this.full && this.internalBusy() |
| 1246 | } |
| 1247 | |
| 1248 | /** |
| 1249 | * Sends a message to worker given its worker node key. |
| 1250 | * |
| 1251 | * @param workerNodeKey - The worker node key. |
| 1252 | * @param message - The message. |
| 1253 | * @param transferList - The optional array of transferable objects. |
| 1254 | */ |
| 1255 | protected abstract sendToWorker ( |
| 1256 | workerNodeKey: number, |
| 1257 | message: MessageValue<Data>, |
| 1258 | transferList?: TransferListItem[] |
| 1259 | ): void |
| 1260 | |
| 1261 | /** |
| 1262 | * Creates a new worker. |
| 1263 | * |
| 1264 | * @returns Newly created worker. |
| 1265 | */ |
| 1266 | protected abstract createWorker (): Worker |
| 1267 | |
| 1268 | /** |
| 1269 | * Creates a new, completely set up worker node. |
| 1270 | * |
| 1271 | * @returns New, completely set up worker node key. |
| 1272 | */ |
| 1273 | protected createAndSetupWorkerNode (): number { |
| 1274 | const worker = this.createWorker() |
| 1275 | |
| 1276 | worker.on('online', this.opts.onlineHandler ?? EMPTY_FUNCTION) |
| 1277 | worker.on('message', this.opts.messageHandler ?? EMPTY_FUNCTION) |
| 1278 | worker.on('error', this.opts.errorHandler ?? EMPTY_FUNCTION) |
| 1279 | worker.on('error', error => { |
| 1280 | const workerNodeKey = this.getWorkerNodeKeyByWorker(worker) |
| 1281 | this.flagWorkerNodeAsNotReady(workerNodeKey) |
| 1282 | const workerInfo = this.getWorkerInfo(workerNodeKey) |
| 1283 | this.emitter?.emit(PoolEvents.error, error) |
| 1284 | this.workerNodes[workerNodeKey].closeChannel() |
| 1285 | if ( |
| 1286 | this.started && |
| 1287 | !this.starting && |
| 1288 | !this.destroying && |
| 1289 | this.opts.restartWorkerOnError === true |
| 1290 | ) { |
| 1291 | if (workerInfo.dynamic) { |
| 1292 | this.createAndSetupDynamicWorkerNode() |
| 1293 | } else { |
| 1294 | this.createAndSetupWorkerNode() |
| 1295 | } |
| 1296 | } |
| 1297 | if (this.started && this.opts.enableTasksQueue === true) { |
| 1298 | this.redistributeQueuedTasks(workerNodeKey) |
| 1299 | } |
| 1300 | }) |
| 1301 | worker.on('exit', this.opts.exitHandler ?? EMPTY_FUNCTION) |
| 1302 | worker.once('exit', () => { |
| 1303 | this.removeWorkerNode(worker) |
| 1304 | }) |
| 1305 | |
| 1306 | const workerNodeKey = this.addWorkerNode(worker) |
| 1307 | |
| 1308 | this.afterWorkerNodeSetup(workerNodeKey) |
| 1309 | |
| 1310 | return workerNodeKey |
| 1311 | } |
| 1312 | |
| 1313 | /** |
| 1314 | * Creates a new, completely set up dynamic worker node. |
| 1315 | * |
| 1316 | * @returns New, completely set up dynamic worker node key. |
| 1317 | */ |
| 1318 | protected createAndSetupDynamicWorkerNode (): number { |
| 1319 | const workerNodeKey = this.createAndSetupWorkerNode() |
| 1320 | this.registerWorkerMessageListener(workerNodeKey, message => { |
| 1321 | this.checkMessageWorkerId(message) |
| 1322 | const localWorkerNodeKey = this.getWorkerNodeKeyByWorkerId( |
| 1323 | message.workerId |
| 1324 | ) |
| 1325 | const workerUsage = this.workerNodes[localWorkerNodeKey].usage |
| 1326 | // Kill message received from worker |
| 1327 | if ( |
| 1328 | isKillBehavior(KillBehaviors.HARD, message.kill) || |
| 1329 | (isKillBehavior(KillBehaviors.SOFT, message.kill) && |
| 1330 | ((this.opts.enableTasksQueue === false && |
| 1331 | workerUsage.tasks.executing === 0) || |
| 1332 | (this.opts.enableTasksQueue === true && |
| 1333 | workerUsage.tasks.executing === 0 && |
| 1334 | this.tasksQueueSize(localWorkerNodeKey) === 0))) |
| 1335 | ) { |
| 1336 | // Flag the worker node as not ready immediately |
| 1337 | this.flagWorkerNodeAsNotReady(localWorkerNodeKey) |
| 1338 | this.destroyWorkerNode(localWorkerNodeKey).catch(error => { |
| 1339 | this.emitter?.emit(PoolEvents.error, error) |
| 1340 | }) |
| 1341 | } |
| 1342 | }) |
| 1343 | const workerInfo = this.getWorkerInfo(workerNodeKey) |
| 1344 | this.sendToWorker(workerNodeKey, { |
| 1345 | checkActive: true |
| 1346 | }) |
| 1347 | if (this.taskFunctions.size > 0) { |
| 1348 | for (const [taskFunctionName, taskFunction] of this.taskFunctions) { |
| 1349 | this.sendTaskFunctionOperationToWorker(workerNodeKey, { |
| 1350 | taskFunctionOperation: 'add', |
| 1351 | taskFunctionName, |
| 1352 | taskFunction: taskFunction.toString() |
| 1353 | }).catch(error => { |
| 1354 | this.emitter?.emit(PoolEvents.error, error) |
| 1355 | }) |
| 1356 | } |
| 1357 | } |
| 1358 | workerInfo.dynamic = true |
| 1359 | if ( |
| 1360 | this.workerChoiceStrategyContext.getStrategyPolicy().dynamicWorkerReady || |
| 1361 | this.workerChoiceStrategyContext.getStrategyPolicy().dynamicWorkerUsage |
| 1362 | ) { |
| 1363 | workerInfo.ready = true |
| 1364 | } |
| 1365 | this.checkAndEmitDynamicWorkerCreationEvents() |
| 1366 | return workerNodeKey |
| 1367 | } |
| 1368 | |
| 1369 | /** |
| 1370 | * Registers a listener callback on the worker given its worker node key. |
| 1371 | * |
| 1372 | * @param workerNodeKey - The worker node key. |
| 1373 | * @param listener - The message listener callback. |
| 1374 | */ |
| 1375 | protected abstract registerWorkerMessageListener< |
| 1376 | Message extends Data | Response |
| 1377 | >( |
| 1378 | workerNodeKey: number, |
| 1379 | listener: (message: MessageValue<Message>) => void |
| 1380 | ): void |
| 1381 | |
| 1382 | /** |
| 1383 | * Registers once a listener callback on the worker given its worker node key. |
| 1384 | * |
| 1385 | * @param workerNodeKey - The worker node key. |
| 1386 | * @param listener - The message listener callback. |
| 1387 | */ |
| 1388 | protected abstract registerOnceWorkerMessageListener< |
| 1389 | Message extends Data | Response |
| 1390 | >( |
| 1391 | workerNodeKey: number, |
| 1392 | listener: (message: MessageValue<Message>) => void |
| 1393 | ): void |
| 1394 | |
| 1395 | /** |
| 1396 | * Deregisters a listener callback on the worker given its worker node key. |
| 1397 | * |
| 1398 | * @param workerNodeKey - The worker node key. |
| 1399 | * @param listener - The message listener callback. |
| 1400 | */ |
| 1401 | protected abstract deregisterWorkerMessageListener< |
| 1402 | Message extends Data | Response |
| 1403 | >( |
| 1404 | workerNodeKey: number, |
| 1405 | listener: (message: MessageValue<Message>) => void |
| 1406 | ): void |
| 1407 | |
| 1408 | /** |
| 1409 | * Method hooked up after a worker node has been newly created. |
| 1410 | * Can be overridden. |
| 1411 | * |
| 1412 | * @param workerNodeKey - The newly created worker node key. |
| 1413 | */ |
| 1414 | protected afterWorkerNodeSetup (workerNodeKey: number): void { |
| 1415 | // Listen to worker messages. |
| 1416 | this.registerWorkerMessageListener( |
| 1417 | workerNodeKey, |
| 1418 | this.workerMessageListener |
| 1419 | ) |
| 1420 | // Send the startup message to worker. |
| 1421 | this.sendStartupMessageToWorker(workerNodeKey) |
| 1422 | // Send the statistics message to worker. |
| 1423 | this.sendStatisticsMessageToWorker(workerNodeKey) |
| 1424 | if (this.opts.enableTasksQueue === true) { |
| 1425 | if (this.opts.tasksQueueOptions?.taskStealing === true) { |
| 1426 | this.workerNodes[workerNodeKey].on( |
| 1427 | 'idleWorkerNode', |
| 1428 | this.handleIdleWorkerNodeEvent |
| 1429 | ) |
| 1430 | } |
| 1431 | if (this.opts.tasksQueueOptions?.tasksStealingOnBackPressure === true) { |
| 1432 | this.workerNodes[workerNodeKey].on( |
| 1433 | 'backPressure', |
| 1434 | this.handleBackPressureEvent |
| 1435 | ) |
| 1436 | } |
| 1437 | } |
| 1438 | } |
| 1439 | |
| 1440 | /** |
| 1441 | * Sends the startup message to worker given its worker node key. |
| 1442 | * |
| 1443 | * @param workerNodeKey - The worker node key. |
| 1444 | */ |
| 1445 | protected abstract sendStartupMessageToWorker (workerNodeKey: number): void |
| 1446 | |
| 1447 | /** |
| 1448 | * Sends the statistics message to worker given its worker node key. |
| 1449 | * |
| 1450 | * @param workerNodeKey - The worker node key. |
| 1451 | */ |
| 1452 | private sendStatisticsMessageToWorker (workerNodeKey: number): void { |
| 1453 | this.sendToWorker(workerNodeKey, { |
| 1454 | statistics: { |
| 1455 | runTime: |
| 1456 | this.workerChoiceStrategyContext.getTaskStatisticsRequirements() |
| 1457 | .runTime.aggregate, |
| 1458 | elu: this.workerChoiceStrategyContext.getTaskStatisticsRequirements() |
| 1459 | .elu.aggregate |
| 1460 | } |
| 1461 | }) |
| 1462 | } |
| 1463 | |
| 1464 | private handleTask (workerNodeKey: number, task: Task<Data>): void { |
| 1465 | if (this.shallExecuteTask(workerNodeKey)) { |
| 1466 | this.executeTask(workerNodeKey, task) |
| 1467 | } else { |
| 1468 | this.enqueueTask(workerNodeKey, task) |
| 1469 | } |
| 1470 | } |
| 1471 | |
| 1472 | private redistributeQueuedTasks (workerNodeKey: number): void { |
| 1473 | if (this.workerNodes.length <= 1) { |
| 1474 | return |
| 1475 | } |
| 1476 | while (this.tasksQueueSize(workerNodeKey) > 0) { |
| 1477 | const destinationWorkerNodeKey = this.workerNodes.reduce( |
| 1478 | (minWorkerNodeKey, workerNode, workerNodeKey, workerNodes) => { |
| 1479 | return workerNode.info.ready && |
| 1480 | workerNode.usage.tasks.queued < |
| 1481 | workerNodes[minWorkerNodeKey].usage.tasks.queued |
| 1482 | ? workerNodeKey |
| 1483 | : minWorkerNodeKey |
| 1484 | }, |
| 1485 | 0 |
| 1486 | ) |
| 1487 | this.handleTask( |
| 1488 | destinationWorkerNodeKey, |
| 1489 | this.dequeueTask(workerNodeKey) as Task<Data> |
| 1490 | ) |
| 1491 | } |
| 1492 | } |
| 1493 | |
| 1494 | private updateTaskStolenStatisticsWorkerUsage ( |
| 1495 | workerNodeKey: number, |
| 1496 | taskName: string |
| 1497 | ): void { |
| 1498 | const workerNode = this.workerNodes[workerNodeKey] |
| 1499 | if (workerNode?.usage != null) { |
| 1500 | ++workerNode.usage.tasks.stolen |
| 1501 | } |
| 1502 | if ( |
| 1503 | this.shallUpdateTaskFunctionWorkerUsage(workerNodeKey) && |
| 1504 | workerNode.getTaskFunctionWorkerUsage(taskName) != null |
| 1505 | ) { |
| 1506 | const taskFunctionWorkerUsage = workerNode.getTaskFunctionWorkerUsage( |
| 1507 | taskName |
| 1508 | ) as WorkerUsage |
| 1509 | ++taskFunctionWorkerUsage.tasks.stolen |
| 1510 | } |
| 1511 | } |
| 1512 | |
| 1513 | private updateTaskSequentiallyStolenStatisticsWorkerUsage ( |
| 1514 | workerNodeKey: number |
| 1515 | ): void { |
| 1516 | const workerNode = this.workerNodes[workerNodeKey] |
| 1517 | if (workerNode?.usage != null) { |
| 1518 | ++workerNode.usage.tasks.sequentiallyStolen |
| 1519 | } |
| 1520 | } |
| 1521 | |
| 1522 | private updateTaskSequentiallyStolenStatisticsTaskFunctionWorkerUsage ( |
| 1523 | workerNodeKey: number, |
| 1524 | taskName: string |
| 1525 | ): void { |
| 1526 | const workerNode = this.workerNodes[workerNodeKey] |
| 1527 | if ( |
| 1528 | this.shallUpdateTaskFunctionWorkerUsage(workerNodeKey) && |
| 1529 | workerNode.getTaskFunctionWorkerUsage(taskName) != null |
| 1530 | ) { |
| 1531 | const taskFunctionWorkerUsage = workerNode.getTaskFunctionWorkerUsage( |
| 1532 | taskName |
| 1533 | ) as WorkerUsage |
| 1534 | ++taskFunctionWorkerUsage.tasks.sequentiallyStolen |
| 1535 | } |
| 1536 | } |
| 1537 | |
| 1538 | private resetTaskSequentiallyStolenStatisticsWorkerUsage ( |
| 1539 | workerNodeKey: number |
| 1540 | ): void { |
| 1541 | const workerNode = this.workerNodes[workerNodeKey] |
| 1542 | if (workerNode?.usage != null) { |
| 1543 | workerNode.usage.tasks.sequentiallyStolen = 0 |
| 1544 | } |
| 1545 | } |
| 1546 | |
| 1547 | private resetTaskSequentiallyStolenStatisticsTaskFunctionWorkerUsage ( |
| 1548 | workerNodeKey: number, |
| 1549 | taskName: string |
| 1550 | ): void { |
| 1551 | const workerNode = this.workerNodes[workerNodeKey] |
| 1552 | if ( |
| 1553 | this.shallUpdateTaskFunctionWorkerUsage(workerNodeKey) && |
| 1554 | workerNode.getTaskFunctionWorkerUsage(taskName) != null |
| 1555 | ) { |
| 1556 | const taskFunctionWorkerUsage = workerNode.getTaskFunctionWorkerUsage( |
| 1557 | taskName |
| 1558 | ) as WorkerUsage |
| 1559 | taskFunctionWorkerUsage.tasks.sequentiallyStolen = 0 |
| 1560 | } |
| 1561 | } |
| 1562 | |
| 1563 | private readonly handleIdleWorkerNodeEvent = ( |
| 1564 | eventDetail: WorkerNodeEventDetail, |
| 1565 | previousStolenTask?: Task<Data> |
| 1566 | ): void => { |
| 1567 | if (this.workerNodes.length <= 1) { |
| 1568 | return |
| 1569 | } |
| 1570 | const { workerNodeKey } = eventDetail |
| 1571 | if (workerNodeKey == null) { |
| 1572 | throw new Error( |
| 1573 | 'WorkerNode event detail workerNodeKey attribute must be defined' |
| 1574 | ) |
| 1575 | } |
| 1576 | const workerNodeTasksUsage = this.workerNodes[workerNodeKey].usage.tasks |
| 1577 | if ( |
| 1578 | previousStolenTask != null && |
| 1579 | workerNodeTasksUsage.sequentiallyStolen > 0 && |
| 1580 | (workerNodeTasksUsage.executing > 0 || |
| 1581 | this.tasksQueueSize(workerNodeKey) > 0) |
| 1582 | ) { |
| 1583 | for (const taskName of this.workerNodes[workerNodeKey].info |
| 1584 | .taskFunctionNames as string[]) { |
| 1585 | this.resetTaskSequentiallyStolenStatisticsTaskFunctionWorkerUsage( |
| 1586 | workerNodeKey, |
| 1587 | taskName |
| 1588 | ) |
| 1589 | } |
| 1590 | this.resetTaskSequentiallyStolenStatisticsWorkerUsage(workerNodeKey) |
| 1591 | return |
| 1592 | } |
| 1593 | const stolenTask = this.workerNodeStealTask(workerNodeKey) |
| 1594 | if ( |
| 1595 | this.shallUpdateTaskFunctionWorkerUsage(workerNodeKey) && |
| 1596 | stolenTask != null |
| 1597 | ) { |
| 1598 | const taskFunctionTasksWorkerUsage = this.workerNodes[ |
| 1599 | workerNodeKey |
| 1600 | ].getTaskFunctionWorkerUsage(stolenTask.name as string) |
| 1601 | ?.tasks as TaskStatistics |
| 1602 | if ( |
| 1603 | taskFunctionTasksWorkerUsage.sequentiallyStolen === 0 || |
| 1604 | (previousStolenTask != null && |
| 1605 | previousStolenTask.name === stolenTask.name && |
| 1606 | taskFunctionTasksWorkerUsage.sequentiallyStolen > 0) |
| 1607 | ) { |
| 1608 | this.updateTaskSequentiallyStolenStatisticsTaskFunctionWorkerUsage( |
| 1609 | workerNodeKey, |
| 1610 | stolenTask.name as string |
| 1611 | ) |
| 1612 | } else { |
| 1613 | this.resetTaskSequentiallyStolenStatisticsTaskFunctionWorkerUsage( |
| 1614 | workerNodeKey, |
| 1615 | stolenTask.name as string |
| 1616 | ) |
| 1617 | } |
| 1618 | } |
| 1619 | sleep(exponentialDelay(workerNodeTasksUsage.sequentiallyStolen)) |
| 1620 | .then(() => { |
| 1621 | this.handleIdleWorkerNodeEvent(eventDetail, stolenTask) |
| 1622 | return undefined |
| 1623 | }) |
| 1624 | .catch(EMPTY_FUNCTION) |
| 1625 | } |
| 1626 | |
| 1627 | private readonly workerNodeStealTask = ( |
| 1628 | workerNodeKey: number |
| 1629 | ): Task<Data> | undefined => { |
| 1630 | const workerNodes = this.workerNodes |
| 1631 | .slice() |
| 1632 | .sort( |
| 1633 | (workerNodeA, workerNodeB) => |
| 1634 | workerNodeB.usage.tasks.queued - workerNodeA.usage.tasks.queued |
| 1635 | ) |
| 1636 | const sourceWorkerNode = workerNodes.find( |
| 1637 | (sourceWorkerNode, sourceWorkerNodeKey) => |
| 1638 | sourceWorkerNode.info.ready && |
| 1639 | sourceWorkerNodeKey !== workerNodeKey && |
| 1640 | sourceWorkerNode.usage.tasks.queued > 0 |
| 1641 | ) |
| 1642 | if (sourceWorkerNode != null) { |
| 1643 | const task = sourceWorkerNode.popTask() as Task<Data> |
| 1644 | this.handleTask(workerNodeKey, task) |
| 1645 | this.updateTaskSequentiallyStolenStatisticsWorkerUsage(workerNodeKey) |
| 1646 | this.updateTaskStolenStatisticsWorkerUsage( |
| 1647 | workerNodeKey, |
| 1648 | task.name as string |
| 1649 | ) |
| 1650 | return task |
| 1651 | } |
| 1652 | } |
| 1653 | |
| 1654 | private readonly handleBackPressureEvent = ( |
| 1655 | eventDetail: WorkerNodeEventDetail |
| 1656 | ): void => { |
| 1657 | if (this.workerNodes.length <= 1) { |
| 1658 | return |
| 1659 | } |
| 1660 | const { workerId } = eventDetail |
| 1661 | const sizeOffset = 1 |
| 1662 | if ((this.opts.tasksQueueOptions?.size as number) <= sizeOffset) { |
| 1663 | return |
| 1664 | } |
| 1665 | const sourceWorkerNode = |
| 1666 | this.workerNodes[this.getWorkerNodeKeyByWorkerId(workerId)] |
| 1667 | const workerNodes = this.workerNodes |
| 1668 | .slice() |
| 1669 | .sort( |
| 1670 | (workerNodeA, workerNodeB) => |
| 1671 | workerNodeA.usage.tasks.queued - workerNodeB.usage.tasks.queued |
| 1672 | ) |
| 1673 | for (const [workerNodeKey, workerNode] of workerNodes.entries()) { |
| 1674 | if ( |
| 1675 | sourceWorkerNode.usage.tasks.queued > 0 && |
| 1676 | workerNode.info.ready && |
| 1677 | workerNode.info.id !== workerId && |
| 1678 | workerNode.usage.tasks.queued < |
| 1679 | (this.opts.tasksQueueOptions?.size as number) - sizeOffset |
| 1680 | ) { |
| 1681 | const task = sourceWorkerNode.popTask() as Task<Data> |
| 1682 | this.handleTask(workerNodeKey, task) |
| 1683 | this.updateTaskStolenStatisticsWorkerUsage( |
| 1684 | workerNodeKey, |
| 1685 | task.name as string |
| 1686 | ) |
| 1687 | } |
| 1688 | } |
| 1689 | } |
| 1690 | |
| 1691 | /** |
| 1692 | * This method is the message listener registered on each worker. |
| 1693 | */ |
| 1694 | protected readonly workerMessageListener = ( |
| 1695 | message: MessageValue<Response> |
| 1696 | ): void => { |
| 1697 | this.checkMessageWorkerId(message) |
| 1698 | const { workerId, ready, taskId, taskFunctionNames } = message |
| 1699 | if (ready != null && taskFunctionNames != null) { |
| 1700 | // Worker ready response received from worker |
| 1701 | this.handleWorkerReadyResponse(message) |
| 1702 | } else if (taskId != null) { |
| 1703 | // Task execution response received from worker |
| 1704 | this.handleTaskExecutionResponse(message) |
| 1705 | } else if (taskFunctionNames != null) { |
| 1706 | // Task function names message received from worker |
| 1707 | this.getWorkerInfo( |
| 1708 | this.getWorkerNodeKeyByWorkerId(workerId) |
| 1709 | ).taskFunctionNames = taskFunctionNames |
| 1710 | } |
| 1711 | } |
| 1712 | |
| 1713 | private handleWorkerReadyResponse (message: MessageValue<Response>): void { |
| 1714 | const { workerId, ready, taskFunctionNames } = message |
| 1715 | if (ready === false) { |
| 1716 | throw new Error(`Worker ${workerId as number} failed to initialize`) |
| 1717 | } |
| 1718 | const workerInfo = this.getWorkerInfo( |
| 1719 | this.getWorkerNodeKeyByWorkerId(workerId) |
| 1720 | ) |
| 1721 | workerInfo.ready = ready as boolean |
| 1722 | workerInfo.taskFunctionNames = taskFunctionNames |
| 1723 | if (!this.readyEventEmitted && this.ready) { |
| 1724 | this.readyEventEmitted = true |
| 1725 | this.emitter?.emit(PoolEvents.ready, this.info) |
| 1726 | } |
| 1727 | } |
| 1728 | |
| 1729 | private handleTaskExecutionResponse (message: MessageValue<Response>): void { |
| 1730 | const { workerId, taskId, workerError, data } = message |
| 1731 | const promiseResponse = this.promiseResponseMap.get(taskId as string) |
| 1732 | if (promiseResponse != null) { |
| 1733 | const { resolve, reject, workerNodeKey, asyncResource } = promiseResponse |
| 1734 | if (workerError != null) { |
| 1735 | this.emitter?.emit(PoolEvents.taskError, workerError) |
| 1736 | asyncResource != null |
| 1737 | ? asyncResource.runInAsyncScope( |
| 1738 | reject, |
| 1739 | this.emitter, |
| 1740 | workerError.message |
| 1741 | ) |
| 1742 | : reject(workerError.message) |
| 1743 | } else { |
| 1744 | asyncResource != null |
| 1745 | ? asyncResource.runInAsyncScope(resolve, this.emitter, data) |
| 1746 | : resolve(data as Response) |
| 1747 | } |
| 1748 | asyncResource?.emitDestroy() |
| 1749 | this.afterTaskExecutionHook(workerNodeKey, message) |
| 1750 | this.workerChoiceStrategyContext.update(workerNodeKey) |
| 1751 | this.promiseResponseMap.delete(taskId as string) |
| 1752 | if (this.opts.enableTasksQueue === true) { |
| 1753 | const workerNodeTasksUsage = this.workerNodes[workerNodeKey].usage.tasks |
| 1754 | if ( |
| 1755 | this.tasksQueueSize(workerNodeKey) > 0 && |
| 1756 | workerNodeTasksUsage.executing < |
| 1757 | (this.opts.tasksQueueOptions?.concurrency as number) |
| 1758 | ) { |
| 1759 | this.executeTask( |
| 1760 | workerNodeKey, |
| 1761 | this.dequeueTask(workerNodeKey) as Task<Data> |
| 1762 | ) |
| 1763 | } |
| 1764 | if ( |
| 1765 | workerNodeTasksUsage.executing === 0 && |
| 1766 | this.tasksQueueSize(workerNodeKey) === 0 && |
| 1767 | workerNodeTasksUsage.sequentiallyStolen === 0 |
| 1768 | ) { |
| 1769 | this.workerNodes[workerNodeKey].emit('idleWorkerNode', { |
| 1770 | workerId: workerId as number, |
| 1771 | workerNodeKey |
| 1772 | }) |
| 1773 | } |
| 1774 | } |
| 1775 | } |
| 1776 | } |
| 1777 | |
| 1778 | private checkAndEmitTaskExecutionEvents (): void { |
| 1779 | if (this.busy) { |
| 1780 | this.emitter?.emit(PoolEvents.busy, this.info) |
| 1781 | } |
| 1782 | } |
| 1783 | |
| 1784 | private checkAndEmitTaskQueuingEvents (): void { |
| 1785 | if (this.hasBackPressure()) { |
| 1786 | this.emitter?.emit(PoolEvents.backPressure, this.info) |
| 1787 | } |
| 1788 | } |
| 1789 | |
| 1790 | private checkAndEmitDynamicWorkerCreationEvents (): void { |
| 1791 | if (this.type === PoolTypes.dynamic) { |
| 1792 | if (this.full) { |
| 1793 | this.emitter?.emit(PoolEvents.full, this.info) |
| 1794 | } |
| 1795 | } |
| 1796 | } |
| 1797 | |
| 1798 | /** |
| 1799 | * Gets the worker information given its worker node key. |
| 1800 | * |
| 1801 | * @param workerNodeKey - The worker node key. |
| 1802 | * @returns The worker information. |
| 1803 | */ |
| 1804 | protected getWorkerInfo (workerNodeKey: number): WorkerInfo { |
| 1805 | return this.workerNodes[workerNodeKey]?.info |
| 1806 | } |
| 1807 | |
| 1808 | /** |
| 1809 | * Adds the given worker in the pool worker nodes. |
| 1810 | * |
| 1811 | * @param worker - The worker. |
| 1812 | * @returns The added worker node key. |
| 1813 | * @throws {@link https://nodejs.org/api/errors.html#class-error} If the added worker node is not found. |
| 1814 | */ |
| 1815 | private addWorkerNode (worker: Worker): number { |
| 1816 | const workerNode = new WorkerNode<Worker, Data>( |
| 1817 | worker, |
| 1818 | this.opts.tasksQueueOptions?.size ?? Math.pow(this.maxSize, 2) |
| 1819 | ) |
| 1820 | // Flag the worker node as ready at pool startup. |
| 1821 | if (this.starting) { |
| 1822 | workerNode.info.ready = true |
| 1823 | } |
| 1824 | this.workerNodes.push(workerNode) |
| 1825 | const workerNodeKey = this.getWorkerNodeKeyByWorker(worker) |
| 1826 | if (workerNodeKey === -1) { |
| 1827 | throw new Error('Worker added not found in worker nodes') |
| 1828 | } |
| 1829 | return workerNodeKey |
| 1830 | } |
| 1831 | |
| 1832 | /** |
| 1833 | * Removes the given worker from the pool worker nodes. |
| 1834 | * |
| 1835 | * @param worker - The worker. |
| 1836 | */ |
| 1837 | private removeWorkerNode (worker: Worker): void { |
| 1838 | const workerNodeKey = this.getWorkerNodeKeyByWorker(worker) |
| 1839 | if (workerNodeKey !== -1) { |
| 1840 | this.workerNodes.splice(workerNodeKey, 1) |
| 1841 | this.workerChoiceStrategyContext.remove(workerNodeKey) |
| 1842 | } |
| 1843 | } |
| 1844 | |
| 1845 | protected flagWorkerNodeAsNotReady (workerNodeKey: number): void { |
| 1846 | this.getWorkerInfo(workerNodeKey).ready = false |
| 1847 | } |
| 1848 | |
| 1849 | /** @inheritDoc */ |
| 1850 | public hasWorkerNodeBackPressure (workerNodeKey: number): boolean { |
| 1851 | return ( |
| 1852 | this.opts.enableTasksQueue === true && |
| 1853 | this.workerNodes[workerNodeKey].hasBackPressure() |
| 1854 | ) |
| 1855 | } |
| 1856 | |
| 1857 | private hasBackPressure (): boolean { |
| 1858 | return ( |
| 1859 | this.opts.enableTasksQueue === true && |
| 1860 | this.workerNodes.findIndex( |
| 1861 | workerNode => !workerNode.hasBackPressure() |
| 1862 | ) === -1 |
| 1863 | ) |
| 1864 | } |
| 1865 | |
| 1866 | /** |
| 1867 | * Executes the given task on the worker given its worker node key. |
| 1868 | * |
| 1869 | * @param workerNodeKey - The worker node key. |
| 1870 | * @param task - The task to execute. |
| 1871 | */ |
| 1872 | private executeTask (workerNodeKey: number, task: Task<Data>): void { |
| 1873 | this.beforeTaskExecutionHook(workerNodeKey, task) |
| 1874 | this.sendToWorker(workerNodeKey, task, task.transferList) |
| 1875 | this.checkAndEmitTaskExecutionEvents() |
| 1876 | } |
| 1877 | |
| 1878 | private enqueueTask (workerNodeKey: number, task: Task<Data>): number { |
| 1879 | const tasksQueueSize = this.workerNodes[workerNodeKey].enqueueTask(task) |
| 1880 | this.checkAndEmitTaskQueuingEvents() |
| 1881 | return tasksQueueSize |
| 1882 | } |
| 1883 | |
| 1884 | private dequeueTask (workerNodeKey: number): Task<Data> | undefined { |
| 1885 | return this.workerNodes[workerNodeKey].dequeueTask() |
| 1886 | } |
| 1887 | |
| 1888 | private tasksQueueSize (workerNodeKey: number): number { |
| 1889 | return this.workerNodes[workerNodeKey].tasksQueueSize() |
| 1890 | } |
| 1891 | |
| 1892 | protected flushTasksQueue (workerNodeKey: number): void { |
| 1893 | while (this.tasksQueueSize(workerNodeKey) > 0) { |
| 1894 | this.executeTask( |
| 1895 | workerNodeKey, |
| 1896 | this.dequeueTask(workerNodeKey) as Task<Data> |
| 1897 | ) |
| 1898 | } |
| 1899 | this.workerNodes[workerNodeKey].clearTasksQueue() |
| 1900 | } |
| 1901 | |
| 1902 | private flushTasksQueues (): void { |
| 1903 | for (const [workerNodeKey] of this.workerNodes.entries()) { |
| 1904 | this.flushTasksQueue(workerNodeKey) |
| 1905 | } |
| 1906 | } |
| 1907 | } |