import { randomUUID } from 'node:crypto'
import { performance } from 'node:perf_hooks'
-import { existsSync } from 'node:fs'
+import type { TransferListItem } from 'node:worker_threads'
+import { EventEmitterAsyncResource } from 'node:events'
+import { AsyncResource } from 'node:async_hooks'
import type {
MessageValue,
PromiseResponseWrapper,
Task
-} from '../utility-types'
+} from '../utility-types.js'
import {
DEFAULT_TASK_NAME,
- DEFAULT_WORKER_CHOICE_STRATEGY_OPTIONS,
EMPTY_FUNCTION,
+ average,
+ exponentialDelay,
isKillBehavior,
isPlainObject,
+ max,
median,
- round
-} from '../utils'
-import { KillBehaviors } from '../worker/worker-options'
+ min,
+ round,
+ sleep
+} from '../utils.js'
+import { KillBehaviors } from '../worker/worker-options.js'
+import type { TaskFunction } from '../worker/task-functions.js'
import {
type IPool,
- PoolEmitter,
PoolEvents,
type PoolInfo,
type PoolOptions,
type PoolType,
PoolTypes,
type TasksQueueOptions
-} from './pool'
+} from './pool.js'
import type {
IWorker,
IWorkerNode,
- MessageHandler,
WorkerInfo,
- WorkerType,
- WorkerUsage
-} from './worker'
+ WorkerNodeEventDetail,
+ WorkerType
+} from './worker.js'
import {
Measurements,
WorkerChoiceStrategies,
type WorkerChoiceStrategy,
type WorkerChoiceStrategyOptions
-} from './selection-strategies/selection-strategies-types'
-import { WorkerChoiceStrategyContext } from './selection-strategies/worker-choice-strategy-context'
-import { version } from './version'
-import { WorkerNode } from './worker-node'
+} from './selection-strategies/selection-strategies-types.js'
+import { WorkerChoiceStrategyContext } from './selection-strategies/worker-choice-strategy-context.js'
+import { version } from './version.js'
+import { WorkerNode } from './worker-node.js'
+import {
+ checkFilePath,
+ checkValidTasksQueueOptions,
+ checkValidWorkerChoiceStrategy,
+ getDefaultTasksQueueOptions,
+ updateEluWorkerUsage,
+ updateRunTimeWorkerUsage,
+ updateTaskStatisticsWorkerUsage,
+ updateWaitTimeWorkerUsage,
+ waitWorkerNodeEvents
+} from './utils.js'
/**
* Base class that implements some shared logic for all poolifier pools.
public readonly workerNodes: Array<IWorkerNode<Worker, Data>> = []
/** @inheritDoc */
- public readonly emitter?: PoolEmitter
+ public emitter?: EventEmitterAsyncResource
/**
- * The execution response promise map.
- *
+ * The task execution response promise map:
* - `key`: The message id of each submitted task.
* - `value`: An object that contains the worker, the execution response promise resolve and reject callbacks.
*
* When we receive a message from the worker, we get a map entry with the promise resolve/reject bound to the message id.
*/
- protected promiseResponseMap: Map<
- string,
- PromiseResponseWrapper<Worker, Response>
- > = new Map<string, PromiseResponseWrapper<Worker, Response>>()
+ protected promiseResponseMap: Map<string, PromiseResponseWrapper<Response>> =
+ new Map<string, PromiseResponseWrapper<Response>>()
/**
* Worker choice strategy context referencing a worker choice algorithm implementation.
*/
- protected workerChoiceStrategyContext: WorkerChoiceStrategyContext<
+ protected workerChoiceStrategyContext?: WorkerChoiceStrategyContext<
Worker,
Data,
Response
>
+ /**
+ * The task functions added at runtime map:
+ * - `key`: The task function name.
+ * - `value`: The task function itself.
+ */
+ private readonly taskFunctions: Map<string, TaskFunction<Data, Response>>
+
+ /**
+ * Whether the pool is started or not.
+ */
+ private started: boolean
+ /**
+ * Whether the pool is starting or not.
+ */
+ private starting: boolean
+ /**
+ * Whether the pool is destroying or not.
+ */
+ private destroying: boolean
+ /**
+ * Whether the pool ready event has been emitted or not.
+ */
+ private readyEventEmitted: boolean
/**
* The start timestamp of the pool.
*/
/**
* Constructs a new poolifier pool.
*
- * @param numberOfWorkers - Number of workers that this pool should manage.
+ * @param minimumNumberOfWorkers - Minimum number of workers that this pool manages.
* @param filePath - Path to the worker file.
* @param opts - Options for the pool.
+ * @param maximumNumberOfWorkers - Maximum number of workers that this pool manages.
*/
public constructor (
- protected readonly numberOfWorkers: number,
+ protected readonly minimumNumberOfWorkers: number,
protected readonly filePath: string,
- protected readonly opts: PoolOptions<Worker>
+ protected readonly opts: PoolOptions<Worker>,
+ protected readonly maximumNumberOfWorkers?: number
) {
if (!this.isMain()) {
- throw new Error('Cannot start a pool from a worker!')
+ throw new Error(
+ 'Cannot start a pool from a worker with the same type as the pool'
+ )
}
- this.checkNumberOfWorkers(this.numberOfWorkers)
- this.checkFilePath(this.filePath)
+ this.checkPoolType()
+ checkFilePath(this.filePath)
+ this.checkMinimumNumberOfWorkers(this.minimumNumberOfWorkers)
this.checkPoolOptions(this.opts)
this.chooseWorkerNode = this.chooseWorkerNode.bind(this)
this.executeTask = this.executeTask.bind(this)
this.enqueueTask = this.enqueueTask.bind(this)
- this.checkAndEmitEvents = this.checkAndEmitEvents.bind(this)
if (this.opts.enableEvents === true) {
- this.emitter = new PoolEmitter()
+ this.initializeEventEmitter()
}
this.workerChoiceStrategyContext = new WorkerChoiceStrategyContext<
Worker,
this.setupHook()
- while (
- this.workerNodes.reduce(
- (accumulator, workerNode) =>
- !workerNode.info.dynamic ? accumulator + 1 : accumulator,
- 0
- ) < this.numberOfWorkers
- ) {
- this.createAndSetupWorker()
+ this.taskFunctions = new Map<string, TaskFunction<Data, Response>>()
+
+ this.started = false
+ this.starting = false
+ this.destroying = false
+ this.readyEventEmitted = false
+ if (this.opts.startWorkers === true) {
+ this.start()
}
this.startTimestamp = performance.now()
}
- private checkFilePath (filePath: string): void {
- if (
- filePath == null ||
- typeof filePath !== 'string' ||
- (typeof filePath === 'string' && filePath.trim().length === 0)
- ) {
- throw new Error('Please specify a file with a worker implementation')
- }
- if (!existsSync(filePath)) {
- throw new Error(`Cannot find the worker file '${filePath}'`)
+ private checkPoolType (): void {
+ if (this.type === PoolTypes.fixed && this.maximumNumberOfWorkers != null) {
+ throw new Error(
+ 'Cannot instantiate a fixed pool with a maximum number of workers specified at initialization'
+ )
}
}
- private checkNumberOfWorkers (numberOfWorkers: number): void {
- if (numberOfWorkers == null) {
+ private checkMinimumNumberOfWorkers (
+ minimumNumberOfWorkers: number | undefined
+ ): void {
+ if (minimumNumberOfWorkers == null) {
throw new Error(
'Cannot instantiate a pool without specifying the number of workers'
)
- } else if (!Number.isSafeInteger(numberOfWorkers)) {
+ } else if (!Number.isSafeInteger(minimumNumberOfWorkers)) {
throw new TypeError(
'Cannot instantiate a pool with a non safe integer number of workers'
)
- } else if (numberOfWorkers < 0) {
+ } else if (minimumNumberOfWorkers < 0) {
throw new RangeError(
'Cannot instantiate a pool with a negative number of workers'
)
- } else if (this.type === PoolTypes.fixed && numberOfWorkers === 0) {
+ } else if (this.type === PoolTypes.fixed && minimumNumberOfWorkers === 0) {
throw new RangeError('Cannot instantiate a fixed pool with zero worker')
}
}
- protected checkDynamicPoolSize (min: number, max: number): void {
- if (this.type === PoolTypes.dynamic) {
- if (min > max) {
- throw new RangeError(
- 'Cannot instantiate a dynamic pool with a maximum pool size inferior to the minimum pool size'
- )
- } else if (max === 0) {
- throw new RangeError(
- 'Cannot instantiate a dynamic pool with a pool size equal to zero'
- )
- } else if (min === max) {
- throw new RangeError(
- 'Cannot instantiate a dynamic pool with a minimum pool size equal to the maximum pool size. Use a fixed pool instead'
- )
- }
- }
- }
-
private checkPoolOptions (opts: PoolOptions<Worker>): void {
if (isPlainObject(opts)) {
+ this.opts.startWorkers = opts.startWorkers ?? true
+ checkValidWorkerChoiceStrategy(opts.workerChoiceStrategy)
this.opts.workerChoiceStrategy =
opts.workerChoiceStrategy ?? WorkerChoiceStrategies.ROUND_ROBIN
- this.checkValidWorkerChoiceStrategy(this.opts.workerChoiceStrategy)
- this.opts.workerChoiceStrategyOptions =
- opts.workerChoiceStrategyOptions ??
- DEFAULT_WORKER_CHOICE_STRATEGY_OPTIONS
this.checkValidWorkerChoiceStrategyOptions(
- this.opts.workerChoiceStrategyOptions
+ opts.workerChoiceStrategyOptions
)
+ if (opts.workerChoiceStrategyOptions != null) {
+ this.opts.workerChoiceStrategyOptions = opts.workerChoiceStrategyOptions
+ }
this.opts.restartWorkerOnError = opts.restartWorkerOnError ?? true
this.opts.enableEvents = opts.enableEvents ?? true
this.opts.enableTasksQueue = opts.enableTasksQueue ?? false
if (this.opts.enableTasksQueue) {
- this.checkValidTasksQueueOptions(
- opts.tasksQueueOptions as TasksQueueOptions
- )
+ checkValidTasksQueueOptions(opts.tasksQueueOptions)
this.opts.tasksQueueOptions = this.buildTasksQueueOptions(
- opts.tasksQueueOptions as TasksQueueOptions
+ opts.tasksQueueOptions
)
}
} else {
}
}
- private checkValidWorkerChoiceStrategy (
- workerChoiceStrategy: WorkerChoiceStrategy
- ): void {
- if (!Object.values(WorkerChoiceStrategies).includes(workerChoiceStrategy)) {
- throw new Error(
- `Invalid worker choice strategy '${workerChoiceStrategy}'`
- )
- }
- }
-
private checkValidWorkerChoiceStrategyOptions (
- workerChoiceStrategyOptions: WorkerChoiceStrategyOptions
+ workerChoiceStrategyOptions: WorkerChoiceStrategyOptions | undefined
): void {
- if (!isPlainObject(workerChoiceStrategyOptions)) {
+ if (
+ workerChoiceStrategyOptions != null &&
+ !isPlainObject(workerChoiceStrategyOptions)
+ ) {
throw new TypeError(
'Invalid worker choice strategy options: must be a plain object'
)
}
if (
- workerChoiceStrategyOptions.weights != null &&
- Object.keys(workerChoiceStrategyOptions.weights).length !== this.maxSize
+ workerChoiceStrategyOptions?.weights != null &&
+ Object.keys(workerChoiceStrategyOptions.weights).length !==
+ (this.maximumNumberOfWorkers ?? this.minimumNumberOfWorkers)
) {
throw new Error(
'Invalid worker choice strategy options: must have a weight for each worker node'
)
}
if (
- workerChoiceStrategyOptions.measurement != null &&
+ workerChoiceStrategyOptions?.measurement != null &&
!Object.values(Measurements).includes(
workerChoiceStrategyOptions.measurement
)
}
}
- private checkValidTasksQueueOptions (
- tasksQueueOptions: TasksQueueOptions
- ): void {
- if (tasksQueueOptions != null && !isPlainObject(tasksQueueOptions)) {
- throw new TypeError('Invalid tasks queue options: must be a plain object')
- }
- if (
- tasksQueueOptions?.concurrency != null &&
- !Number.isSafeInteger(tasksQueueOptions.concurrency)
- ) {
- throw new TypeError(
- 'Invalid worker tasks concurrency: must be an integer'
- )
- }
- if (
- tasksQueueOptions?.concurrency != null &&
- tasksQueueOptions.concurrency <= 0
- ) {
- throw new Error(
- `Invalid worker tasks concurrency '${tasksQueueOptions.concurrency}'`
- )
- }
+ private initializeEventEmitter (): void {
+ this.emitter = new EventEmitterAsyncResource({
+ name: `poolifier:${this.type}-${this.worker}-pool`
+ })
}
/** @inheritDoc */
version,
type: this.type,
worker: this.worker,
+ started: this.started,
ready: this.ready,
- strategy: this.opts.workerChoiceStrategy as WorkerChoiceStrategy,
- minSize: this.minSize,
- maxSize: this.maxSize,
- ...(this.workerChoiceStrategyContext.getTaskStatisticsRequirements()
- .runTime.aggregate &&
+ // eslint-disable-next-line @typescript-eslint/no-non-null-assertion
+ strategy: this.opts.workerChoiceStrategy!,
+ strategyRetries: this.workerChoiceStrategyContext?.retriesCount ?? 0,
+ minSize: this.minimumNumberOfWorkers,
+ maxSize: this.maximumNumberOfWorkers ?? this.minimumNumberOfWorkers,
+ ...(this.workerChoiceStrategyContext?.getTaskStatisticsRequirements()
+ .runTime.aggregate === true &&
this.workerChoiceStrategyContext.getTaskStatisticsRequirements()
- .waitTime.aggregate && { utilization: round(this.utilization) }),
+ .waitTime.aggregate && {
+ utilization: round(this.utilization)
+ }),
workerNodes: this.workerNodes.length,
idleWorkerNodes: this.workerNodes.reduce(
(accumulator, workerNode) =>
: accumulator,
0
),
+ ...(this.opts.enableTasksQueue === true && {
+ stealingWorkerNodes: this.workerNodes.reduce(
+ (accumulator, workerNode) =>
+ workerNode.info.stealing ? accumulator + 1 : accumulator,
+ 0
+ )
+ }),
busyWorkerNodes: this.workerNodes.reduce(
- (accumulator, workerNode) =>
- workerNode.usage.tasks.executing > 0 ? accumulator + 1 : accumulator,
+ (accumulator, _workerNode, workerNodeKey) =>
+ this.isWorkerNodeBusy(workerNodeKey) ? accumulator + 1 : accumulator,
0
),
executedTasks: this.workerNodes.reduce(
accumulator + workerNode.usage.tasks.executing,
0
),
- queuedTasks: this.workerNodes.reduce(
- (accumulator, workerNode) =>
- accumulator + workerNode.usage.tasks.queued,
- 0
- ),
- maxQueuedTasks: this.workerNodes.reduce(
- (accumulator, workerNode) =>
- accumulator + (workerNode.usage.tasks?.maxQueued ?? 0),
- 0
- ),
+ ...(this.opts.enableTasksQueue === true && {
+ queuedTasks: this.workerNodes.reduce(
+ (accumulator, workerNode) =>
+ accumulator + workerNode.usage.tasks.queued,
+ 0
+ )
+ }),
+ ...(this.opts.enableTasksQueue === true && {
+ maxQueuedTasks: this.workerNodes.reduce(
+ (accumulator, workerNode) =>
+ accumulator + (workerNode.usage.tasks.maxQueued ?? 0),
+ 0
+ )
+ }),
+ ...(this.opts.enableTasksQueue === true && {
+ backPressure: this.hasBackPressure()
+ }),
+ ...(this.opts.enableTasksQueue === true && {
+ stolenTasks: this.workerNodes.reduce(
+ (accumulator, workerNode) =>
+ accumulator + workerNode.usage.tasks.stolen,
+ 0
+ )
+ }),
failedTasks: this.workerNodes.reduce(
(accumulator, workerNode) =>
accumulator + workerNode.usage.tasks.failed,
0
),
- ...(this.workerChoiceStrategyContext.getTaskStatisticsRequirements()
- .runTime.aggregate && {
+ ...(this.workerChoiceStrategyContext?.getTaskStatisticsRequirements()
+ .runTime.aggregate === true && {
runTime: {
minimum: round(
- Math.min(
+ min(
...this.workerNodes.map(
- workerNode => workerNode.usage.runTime?.minimum ?? Infinity
+ workerNode => workerNode.usage.runTime.minimum ?? Infinity
)
)
),
maximum: round(
- Math.max(
+ max(
...this.workerNodes.map(
- workerNode => workerNode.usage.runTime?.maximum ?? -Infinity
+ workerNode => workerNode.usage.runTime.maximum ?? -Infinity
)
)
),
- average: round(
- this.workerNodes.reduce(
- (accumulator, workerNode) =>
- accumulator + (workerNode.usage.runTime?.aggregate ?? 0),
- 0
- ) /
- this.workerNodes.reduce(
- (accumulator, workerNode) =>
- accumulator + (workerNode.usage.tasks?.executed ?? 0),
- 0
+ ...(this.workerChoiceStrategyContext.getTaskStatisticsRequirements()
+ .runTime.average && {
+ average: round(
+ average(
+ this.workerNodes.reduce<number[]>(
+ (accumulator, workerNode) =>
+ accumulator.concat(workerNode.usage.runTime.history),
+ []
+ )
)
- ),
+ )
+ }),
...(this.workerChoiceStrategyContext.getTaskStatisticsRequirements()
.runTime.median && {
median: round(
median(
- this.workerNodes.map(
- workerNode => workerNode.usage.runTime?.median ?? 0
+ this.workerNodes.reduce<number[]>(
+ (accumulator, workerNode) =>
+ accumulator.concat(workerNode.usage.runTime.history),
+ []
)
)
)
})
}
}),
- ...(this.workerChoiceStrategyContext.getTaskStatisticsRequirements()
- .waitTime.aggregate && {
+ ...(this.workerChoiceStrategyContext?.getTaskStatisticsRequirements()
+ .waitTime.aggregate === true && {
waitTime: {
minimum: round(
- Math.min(
+ min(
...this.workerNodes.map(
- workerNode => workerNode.usage.waitTime?.minimum ?? Infinity
+ workerNode => workerNode.usage.waitTime.minimum ?? Infinity
)
)
),
maximum: round(
- Math.max(
+ max(
...this.workerNodes.map(
- workerNode => workerNode.usage.waitTime?.maximum ?? -Infinity
+ workerNode => workerNode.usage.waitTime.maximum ?? -Infinity
)
)
),
- average: round(
- this.workerNodes.reduce(
- (accumulator, workerNode) =>
- accumulator + (workerNode.usage.waitTime?.aggregate ?? 0),
- 0
- ) /
- this.workerNodes.reduce(
- (accumulator, workerNode) =>
- accumulator + (workerNode.usage.tasks?.executed ?? 0),
- 0
+ ...(this.workerChoiceStrategyContext.getTaskStatisticsRequirements()
+ .waitTime.average && {
+ average: round(
+ average(
+ this.workerNodes.reduce<number[]>(
+ (accumulator, workerNode) =>
+ accumulator.concat(workerNode.usage.waitTime.history),
+ []
+ )
)
- ),
+ )
+ }),
...(this.workerChoiceStrategyContext.getTaskStatisticsRequirements()
.waitTime.median && {
median: round(
median(
- this.workerNodes.map(
- workerNode => workerNode.usage.waitTime?.median ?? 0
+ this.workerNodes.reduce<number[]>(
+ (accumulator, workerNode) =>
+ accumulator.concat(workerNode.usage.waitTime.history),
+ []
)
)
)
}
}
- private get starting (): boolean {
- return (
- this.workerNodes.reduce(
- (accumulator, workerNode) =>
- !workerNode.info.dynamic ? accumulator + 1 : accumulator,
- 0
- ) < this.minSize
- )
- }
-
+ /**
+ * The pool readiness boolean status.
+ */
private get ready (): boolean {
+ if (this.empty) {
+ return false
+ }
return (
this.workerNodes.reduce(
(accumulator, workerNode) =>
? accumulator + 1
: accumulator,
0
- ) >= this.minSize
+ ) >= this.minimumNumberOfWorkers
)
}
/**
- * Gets the approximate pool utilization.
+ * The pool emptiness boolean status.
+ */
+ protected get empty (): boolean {
+ return this.minimumNumberOfWorkers === 0 && this.workerNodes.length === 0
+ }
+
+ /**
+ * The approximate pool utilization.
*
* @returns The pool utilization.
*/
private get utilization (): number {
const poolTimeCapacity =
- (performance.now() - this.startTimestamp) * this.maxSize
+ (performance.now() - this.startTimestamp) *
+ (this.maximumNumberOfWorkers ?? this.minimumNumberOfWorkers)
const totalTasksRunTime = this.workerNodes.reduce(
(accumulator, workerNode) =>
- accumulator + (workerNode.usage.runTime?.aggregate ?? 0),
+ accumulator + (workerNode.usage.runTime.aggregate ?? 0),
0
)
const totalTasksWaitTime = this.workerNodes.reduce(
(accumulator, workerNode) =>
- accumulator + (workerNode.usage.waitTime?.aggregate ?? 0),
+ accumulator + (workerNode.usage.waitTime.aggregate ?? 0),
0
)
return (totalTasksRunTime + totalTasksWaitTime) / poolTimeCapacity
}
/**
- * Pool type.
+ * The pool type.
*
* If it is `'dynamic'`, it provides the `max` property.
*/
protected abstract get type (): PoolType
/**
- * Gets the worker type.
+ * The worker type.
*/
protected abstract get worker (): WorkerType
- /**
- * Pool minimum size.
- */
- protected abstract get minSize (): number
-
- /**
- * Pool maximum size.
- */
- protected abstract get maxSize (): number
-
- /**
- * Get the worker given its id.
- *
- * @param workerId - The worker id.
- * @returns The worker if found in the pool worker nodes, `undefined` otherwise.
- */
- private getWorkerById (workerId: number): Worker | undefined {
- return this.workerNodes.find(workerNode => workerNode.info.id === workerId)
- ?.worker
- }
-
/**
* Checks if the worker id sent in the received message from a worker is valid.
*
* @param message - The received message.
* @throws {@link https://nodejs.org/api/errors.html#class-error} If the worker id is invalid.
*/
- private checkMessageWorkerId (message: MessageValue<Response>): void {
- if (
- message.workerId != null &&
- this.getWorkerById(message.workerId) == null
- ) {
+ private checkMessageWorkerId (message: MessageValue<Data | Response>): void {
+ if (message.workerId == null) {
+ throw new Error('Worker message received without worker id')
+ } else if (this.getWorkerNodeKeyByWorkerId(message.workerId) === -1) {
throw new Error(
`Worker message received from unknown worker '${message.workerId}'`
)
}
/**
- * Gets the given worker its worker node key.
+ * Gets the worker node key given its worker id.
*
- * @param worker - The worker.
- * @returns The worker node key if found in the pool worker nodes, `-1` otherwise.
+ * @param workerId - The worker id.
+ * @returns The worker node key if the worker id is found in the pool worker nodes, `-1` otherwise.
*/
- private getWorkerNodeKey (worker: Worker): number {
+ private getWorkerNodeKeyByWorkerId (workerId: number | undefined): number {
return this.workerNodes.findIndex(
- workerNode => workerNode.worker === worker
+ workerNode => workerNode.info.id === workerId
)
}
workerChoiceStrategy: WorkerChoiceStrategy,
workerChoiceStrategyOptions?: WorkerChoiceStrategyOptions
): void {
- this.checkValidWorkerChoiceStrategy(workerChoiceStrategy)
+ checkValidWorkerChoiceStrategy(workerChoiceStrategy)
this.opts.workerChoiceStrategy = workerChoiceStrategy
- this.workerChoiceStrategyContext.setWorkerChoiceStrategy(
+ this.workerChoiceStrategyContext?.setWorkerChoiceStrategy(
this.opts.workerChoiceStrategy
)
if (workerChoiceStrategyOptions != null) {
this.setWorkerChoiceStrategyOptions(workerChoiceStrategyOptions)
}
- for (const workerNode of this.workerNodes) {
+ for (const [workerNodeKey, workerNode] of this.workerNodes.entries()) {
workerNode.resetUsage()
- this.setWorkerStatistics(workerNode.worker)
+ this.sendStatisticsMessageToWorker(workerNodeKey)
}
}
/** @inheritDoc */
public setWorkerChoiceStrategyOptions (
- workerChoiceStrategyOptions: WorkerChoiceStrategyOptions
+ workerChoiceStrategyOptions: WorkerChoiceStrategyOptions | undefined
): void {
this.checkValidWorkerChoiceStrategyOptions(workerChoiceStrategyOptions)
- this.opts.workerChoiceStrategyOptions = workerChoiceStrategyOptions
- this.workerChoiceStrategyContext.setOptions(
+ if (workerChoiceStrategyOptions != null) {
+ this.opts.workerChoiceStrategyOptions = workerChoiceStrategyOptions
+ }
+ this.workerChoiceStrategyContext?.setOptions(
this.opts.workerChoiceStrategyOptions
)
}
tasksQueueOptions?: TasksQueueOptions
): void {
if (this.opts.enableTasksQueue === true && !enable) {
+ this.unsetTaskStealing()
+ this.unsetTasksStealingOnBackPressure()
this.flushTasksQueues()
}
this.opts.enableTasksQueue = enable
- this.setTasksQueueOptions(tasksQueueOptions as TasksQueueOptions)
+ this.setTasksQueueOptions(tasksQueueOptions)
}
/** @inheritDoc */
- public setTasksQueueOptions (tasksQueueOptions: TasksQueueOptions): void {
+ public setTasksQueueOptions (
+ tasksQueueOptions: TasksQueueOptions | undefined
+ ): void {
if (this.opts.enableTasksQueue === true) {
- this.checkValidTasksQueueOptions(tasksQueueOptions)
+ checkValidTasksQueueOptions(tasksQueueOptions)
this.opts.tasksQueueOptions =
this.buildTasksQueueOptions(tasksQueueOptions)
+ // eslint-disable-next-line @typescript-eslint/no-non-null-assertion
+ this.setTasksQueueSize(this.opts.tasksQueueOptions.size!)
+ if (this.opts.tasksQueueOptions.taskStealing === true) {
+ this.unsetTaskStealing()
+ this.setTaskStealing()
+ } else {
+ this.unsetTaskStealing()
+ }
+ if (this.opts.tasksQueueOptions.tasksStealingOnBackPressure === true) {
+ this.unsetTasksStealingOnBackPressure()
+ this.setTasksStealingOnBackPressure()
+ } else {
+ this.unsetTasksStealingOnBackPressure()
+ }
} else if (this.opts.tasksQueueOptions != null) {
delete this.opts.tasksQueueOptions
}
}
private buildTasksQueueOptions (
- tasksQueueOptions: TasksQueueOptions
+ tasksQueueOptions: TasksQueueOptions | undefined
): TasksQueueOptions {
return {
- concurrency: tasksQueueOptions?.concurrency ?? 1
+ ...getDefaultTasksQueueOptions(
+ this.maximumNumberOfWorkers ?? this.minimumNumberOfWorkers
+ ),
+ ...tasksQueueOptions
+ }
+ }
+
+ private setTasksQueueSize (size: number): void {
+ for (const workerNode of this.workerNodes) {
+ workerNode.tasksQueueBackPressureSize = size
+ }
+ }
+
+ private setTaskStealing (): void {
+ for (const [workerNodeKey] of this.workerNodes.entries()) {
+ this.workerNodes[workerNodeKey].on('idle', this.handleWorkerNodeIdleEvent)
+ }
+ }
+
+ private unsetTaskStealing (): void {
+ for (const [workerNodeKey] of this.workerNodes.entries()) {
+ this.workerNodes[workerNodeKey].off(
+ 'idle',
+ this.handleWorkerNodeIdleEvent
+ )
+ }
+ }
+
+ private setTasksStealingOnBackPressure (): void {
+ for (const [workerNodeKey] of this.workerNodes.entries()) {
+ this.workerNodes[workerNodeKey].on(
+ 'backPressure',
+ this.handleWorkerNodeBackPressureEvent
+ )
+ }
+ }
+
+ private unsetTasksStealingOnBackPressure (): void {
+ for (const [workerNodeKey] of this.workerNodes.entries()) {
+ this.workerNodes[workerNodeKey].off(
+ 'backPressure',
+ this.handleWorkerNodeBackPressureEvent
+ )
}
}
* The pool filling boolean status.
*/
protected get full (): boolean {
- return this.workerNodes.length >= this.maxSize
+ return (
+ this.workerNodes.length >=
+ (this.maximumNumberOfWorkers ?? this.minimumNumberOfWorkers)
+ )
}
/**
protected abstract get busy (): boolean
/**
- * Whether worker nodes are executing at least one task.
+ * Whether worker nodes are executing concurrently their tasks quota or not.
*
* @returns Worker nodes busyness boolean status.
*/
protected internalBusy (): boolean {
+ if (this.opts.enableTasksQueue === true) {
+ return (
+ this.workerNodes.findIndex(
+ workerNode =>
+ workerNode.info.ready &&
+ workerNode.usage.tasks.executing <
+ // eslint-disable-next-line @typescript-eslint/no-non-null-assertion
+ this.opts.tasksQueueOptions!.concurrency!
+ ) === -1
+ )
+ }
return (
- this.workerNodes.findIndex(workerNode => {
- return workerNode.usage.tasks.executing === 0
- }) === -1
+ this.workerNodes.findIndex(
+ workerNode =>
+ workerNode.info.ready && workerNode.usage.tasks.executing === 0
+ ) === -1
)
}
- /** @inheritDoc */
- public async execute (data?: Data, name?: string): Promise<Response> {
- const timestamp = performance.now()
- const workerNodeKey = this.chooseWorkerNode()
- const submittedTask: Task<Data> = {
- name: name ?? DEFAULT_TASK_NAME,
- // eslint-disable-next-line @typescript-eslint/consistent-type-assertions
- data: data ?? ({} as Data),
- timestamp,
- workerId: this.getWorkerInfo(workerNodeKey).id as number,
- id: randomUUID()
- }
- const res = new Promise<Response>((resolve, reject) => {
- this.promiseResponseMap.set(submittedTask.id as string, {
- resolve,
- reject,
- worker: this.workerNodes[workerNodeKey].worker
- })
- })
- if (
- this.opts.enableTasksQueue === true &&
- (this.busy ||
+ private isWorkerNodeBusy (workerNodeKey: number): boolean {
+ if (this.opts.enableTasksQueue === true) {
+ return (
this.workerNodes[workerNodeKey].usage.tasks.executing >=
- ((this.opts.tasksQueueOptions as TasksQueueOptions)
- .concurrency as number))
- ) {
- this.enqueueTask(workerNodeKey, submittedTask)
- } else {
- this.executeTask(workerNodeKey, submittedTask)
+ // eslint-disable-next-line @typescript-eslint/no-non-null-assertion
+ this.opts.tasksQueueOptions!.concurrency!
+ )
}
- this.checkAndEmitEvents()
- // eslint-disable-next-line @typescript-eslint/return-await
- return res
+ return this.workerNodes[workerNodeKey].usage.tasks.executing > 0
}
- /** @inheritDoc */
- public async destroy (): Promise<void> {
- await Promise.all(
- this.workerNodes.map(async (workerNode, workerNodeKey) => {
- this.flushTasksQueue(workerNodeKey)
- // FIXME: wait for tasks to be finished
- const workerExitPromise = new Promise<void>(resolve => {
- workerNode.worker.on('exit', () => {
- resolve()
- })
- })
- await this.destroyWorker(workerNode.worker)
- await workerExitPromise
- })
- )
+ private async sendTaskFunctionOperationToWorker (
+ workerNodeKey: number,
+ message: MessageValue<Data>
+ ): Promise<boolean> {
+ return await new Promise<boolean>((resolve, reject) => {
+ const taskFunctionOperationListener = (
+ message: MessageValue<Response>
+ ): void => {
+ this.checkMessageWorkerId(message)
+ const workerId = this.getWorkerInfo(workerNodeKey)?.id
+ if (
+ message.taskFunctionOperationStatus != null &&
+ message.workerId === workerId
+ ) {
+ if (message.taskFunctionOperationStatus) {
+ resolve(true)
+ } else {
+ reject(
+ new Error(
+ `Task function operation '${message.taskFunctionOperation}' failed on worker ${message.workerId} with error: '${message.workerError?.message}'`
+ )
+ )
+ }
+ this.deregisterWorkerMessageListener(
+ this.getWorkerNodeKeyByWorkerId(message.workerId),
+ taskFunctionOperationListener
+ )
+ }
+ }
+ this.registerWorkerMessageListener(
+ workerNodeKey,
+ taskFunctionOperationListener
+ )
+ this.sendToWorker(workerNodeKey, message)
+ })
}
- /**
- * Terminates the given worker.
- *
- * @param worker - A worker within `workerNodes`.
- */
- protected abstract destroyWorker (worker: Worker): void | Promise<void>
-
- /**
- * Setup hook to execute code before worker nodes are created in the abstract constructor.
- * Can be overridden.
- *
- * @virtual
- */
- protected setupHook (): void {
- // Intentionally empty
+ private async sendTaskFunctionOperationToWorkers (
+ message: MessageValue<Data>
+ ): Promise<boolean> {
+ return await new Promise<boolean>((resolve, reject) => {
+ const responsesReceived = new Array<MessageValue<Response>>()
+ const taskFunctionOperationsListener = (
+ message: MessageValue<Response>
+ ): void => {
+ this.checkMessageWorkerId(message)
+ if (message.taskFunctionOperationStatus != null) {
+ responsesReceived.push(message)
+ if (responsesReceived.length === this.workerNodes.length) {
+ if (
+ responsesReceived.every(
+ message => message.taskFunctionOperationStatus === true
+ )
+ ) {
+ resolve(true)
+ } else if (
+ responsesReceived.some(
+ message => message.taskFunctionOperationStatus === false
+ )
+ ) {
+ const errorResponse = responsesReceived.find(
+ response => response.taskFunctionOperationStatus === false
+ )
+ reject(
+ new Error(
+ `Task function operation '${
+ message.taskFunctionOperation as string
+ }' failed on worker ${errorResponse?.workerId} with error: '${
+ errorResponse?.workerError?.message
+ }'`
+ )
+ )
+ }
+ this.deregisterWorkerMessageListener(
+ this.getWorkerNodeKeyByWorkerId(message.workerId),
+ taskFunctionOperationsListener
+ )
+ }
+ }
+ }
+ for (const [workerNodeKey] of this.workerNodes.entries()) {
+ this.registerWorkerMessageListener(
+ workerNodeKey,
+ taskFunctionOperationsListener
+ )
+ this.sendToWorker(workerNodeKey, message)
+ }
+ })
}
- /**
- * Should return whether the worker is the main worker or not.
- */
- protected abstract isMain (): boolean
-
- /**
- * Hook executed before the worker task execution.
- * Can be overridden.
- *
- * @param workerNodeKey - The worker node key.
- * @param task - The task to execute.
- */
- protected beforeTaskExecutionHook (
- workerNodeKey: number,
- task: Task<Data>
- ): void {
- const workerUsage = this.workerNodes[workerNodeKey].usage
- ++workerUsage.tasks.executing
- this.updateWaitTimeWorkerUsage(workerUsage, task)
- const taskWorkerUsage = this.workerNodes[workerNodeKey].getTaskWorkerUsage(
- task.name as string
- ) as WorkerUsage
- ++taskWorkerUsage.tasks.executing
- this.updateWaitTimeWorkerUsage(taskWorkerUsage, task)
+ /** @inheritDoc */
+ public hasTaskFunction (name: string): boolean {
+ for (const workerNode of this.workerNodes) {
+ if (
+ Array.isArray(workerNode.info.taskFunctionNames) &&
+ workerNode.info.taskFunctionNames.includes(name)
+ ) {
+ return true
+ }
+ }
+ return false
}
- /**
- * Hook executed after the worker task execution.
- * Can be overridden.
- *
- * @param worker - The worker.
- * @param message - The received message.
- */
- protected afterTaskExecutionHook (
- worker: Worker,
- message: MessageValue<Response>
- ): void {
- const workerNodeKey = this.getWorkerNodeKey(worker)
- const workerUsage = this.workerNodes[workerNodeKey].usage
- this.updateTaskStatisticsWorkerUsage(workerUsage, message)
- this.updateRunTimeWorkerUsage(workerUsage, message)
- this.updateEluWorkerUsage(workerUsage, message)
- const taskWorkerUsage = this.workerNodes[workerNodeKey].getTaskWorkerUsage(
- message.taskPerformance?.name ?? DEFAULT_TASK_NAME
- ) as WorkerUsage
- this.updateTaskStatisticsWorkerUsage(taskWorkerUsage, message)
- this.updateRunTimeWorkerUsage(taskWorkerUsage, message)
- this.updateEluWorkerUsage(taskWorkerUsage, message)
- }
-
- private updateTaskStatisticsWorkerUsage (
- workerUsage: WorkerUsage,
- message: MessageValue<Response>
- ): void {
- const workerTaskStatistics = workerUsage.tasks
- --workerTaskStatistics.executing
- if (message.taskError == null) {
- ++workerTaskStatistics.executed
- } else {
- ++workerTaskStatistics.failed
+ /** @inheritDoc */
+ public async addTaskFunction (
+ name: string,
+ fn: TaskFunction<Data, Response>
+ ): Promise<boolean> {
+ if (typeof name !== 'string') {
+ throw new TypeError('name argument must be a string')
+ }
+ if (typeof name === 'string' && name.trim().length === 0) {
+ throw new TypeError('name argument must not be an empty string')
}
+ if (typeof fn !== 'function') {
+ throw new TypeError('fn argument must be a function')
+ }
+ const opResult = await this.sendTaskFunctionOperationToWorkers({
+ taskFunctionOperation: 'add',
+ taskFunctionName: name,
+ taskFunction: fn.toString()
+ })
+ this.taskFunctions.set(name, fn)
+ return opResult
}
- private updateRunTimeWorkerUsage (
- workerUsage: WorkerUsage,
- message: MessageValue<Response>
- ): void {
- if (
- this.workerChoiceStrategyContext.getTaskStatisticsRequirements().runTime
- .aggregate
- ) {
- const taskRunTime = message.taskPerformance?.runTime ?? 0
- workerUsage.runTime.aggregate =
- (workerUsage.runTime.aggregate ?? 0) + taskRunTime
- workerUsage.runTime.minimum = Math.min(
- taskRunTime,
- workerUsage.runTime?.minimum ?? Infinity
- )
- workerUsage.runTime.maximum = Math.max(
- taskRunTime,
- workerUsage.runTime?.maximum ?? -Infinity
+ /** @inheritDoc */
+ public async removeTaskFunction (name: string): Promise<boolean> {
+ if (!this.taskFunctions.has(name)) {
+ throw new Error(
+ 'Cannot remove a task function not handled on the pool side'
)
- if (
- this.workerChoiceStrategyContext.getTaskStatisticsRequirements().runTime
- .average &&
- workerUsage.tasks.executed !== 0
- ) {
- workerUsage.runTime.average =
- workerUsage.runTime.aggregate / workerUsage.tasks.executed
- }
- if (
- this.workerChoiceStrategyContext.getTaskStatisticsRequirements().runTime
- .median &&
- message.taskPerformance?.runTime != null
- ) {
- workerUsage.runTime.history.push(message.taskPerformance.runTime)
- workerUsage.runTime.median = median(workerUsage.runTime.history)
- }
}
+ const opResult = await this.sendTaskFunctionOperationToWorkers({
+ taskFunctionOperation: 'remove',
+ taskFunctionName: name
+ })
+ this.deleteTaskFunctionWorkerUsages(name)
+ this.taskFunctions.delete(name)
+ return opResult
}
- private updateWaitTimeWorkerUsage (
- workerUsage: WorkerUsage,
- task: Task<Data>
- ): void {
- const timestamp = performance.now()
- const taskWaitTime = timestamp - (task.timestamp ?? timestamp)
- if (
- this.workerChoiceStrategyContext.getTaskStatisticsRequirements().waitTime
- .aggregate
- ) {
- workerUsage.waitTime.aggregate =
- (workerUsage.waitTime?.aggregate ?? 0) + taskWaitTime
- workerUsage.waitTime.minimum = Math.min(
- taskWaitTime,
- workerUsage.waitTime?.minimum ?? Infinity
- )
- workerUsage.waitTime.maximum = Math.max(
- taskWaitTime,
- workerUsage.waitTime?.maximum ?? -Infinity
- )
+ /** @inheritDoc */
+ public listTaskFunctionNames (): string[] {
+ for (const workerNode of this.workerNodes) {
if (
- this.workerChoiceStrategyContext.getTaskStatisticsRequirements()
- .waitTime.average &&
- workerUsage.tasks.executed !== 0
+ Array.isArray(workerNode.info.taskFunctionNames) &&
+ workerNode.info.taskFunctionNames.length > 0
) {
- workerUsage.waitTime.average =
- workerUsage.waitTime.aggregate / workerUsage.tasks.executed
+ return workerNode.info.taskFunctionNames
+ }
+ }
+ return []
+ }
+
+ /** @inheritDoc */
+ public async setDefaultTaskFunction (name: string): Promise<boolean> {
+ return await this.sendTaskFunctionOperationToWorkers({
+ taskFunctionOperation: 'default',
+ taskFunctionName: name
+ })
+ }
+
+ private deleteTaskFunctionWorkerUsages (name: string): void {
+ for (const workerNode of this.workerNodes) {
+ workerNode.deleteTaskFunctionWorkerUsage(name)
+ }
+ }
+
+ private shallExecuteTask (workerNodeKey: number): boolean {
+ return (
+ this.tasksQueueSize(workerNodeKey) === 0 &&
+ this.workerNodes[workerNodeKey].usage.tasks.executing <
+ // eslint-disable-next-line @typescript-eslint/no-non-null-assertion
+ this.opts.tasksQueueOptions!.concurrency!
+ )
+ }
+
+ /** @inheritDoc */
+ public async execute (
+ data?: Data,
+ name?: string,
+ transferList?: TransferListItem[]
+ ): Promise<Response> {
+ return await new Promise<Response>((resolve, reject) => {
+ if (!this.started) {
+ reject(new Error('Cannot execute a task on not started pool'))
+ return
+ }
+ if (this.destroying) {
+ reject(new Error('Cannot execute a task on destroying pool'))
+ return
+ }
+ if (name != null && typeof name !== 'string') {
+ reject(new TypeError('name argument must be a string'))
+ return
}
if (
- this.workerChoiceStrategyContext.getTaskStatisticsRequirements()
- .waitTime.median
+ name != null &&
+ typeof name === 'string' &&
+ name.trim().length === 0
) {
- workerUsage.waitTime.history.push(taskWaitTime)
- workerUsage.waitTime.median = median(workerUsage.waitTime.history)
+ reject(new TypeError('name argument must not be an empty string'))
+ return
+ }
+ if (transferList != null && !Array.isArray(transferList)) {
+ reject(new TypeError('transferList argument must be an array'))
+ return
}
+ const timestamp = performance.now()
+ const workerNodeKey = this.chooseWorkerNode()
+ const task: Task<Data> = {
+ name: name ?? DEFAULT_TASK_NAME,
+ // eslint-disable-next-line @typescript-eslint/consistent-type-assertions
+ data: data ?? ({} as Data),
+ transferList,
+ timestamp,
+ taskId: randomUUID()
+ }
+ // eslint-disable-next-line @typescript-eslint/no-non-null-assertion
+ this.promiseResponseMap.set(task.taskId!, {
+ resolve,
+ reject,
+ workerNodeKey,
+ ...(this.emitter != null && {
+ asyncResource: new AsyncResource('poolifier:task', {
+ triggerAsyncId: this.emitter.asyncId,
+ requireManualDestroy: true
+ })
+ })
+ })
+ if (
+ this.opts.enableTasksQueue === false ||
+ (this.opts.enableTasksQueue === true &&
+ this.shallExecuteTask(workerNodeKey))
+ ) {
+ this.executeTask(workerNodeKey, task)
+ } else {
+ this.enqueueTask(workerNodeKey, task)
+ }
+ })
+ }
+
+ /** @inheritdoc */
+ public start (): void {
+ if (this.started) {
+ throw new Error('Cannot start an already started pool')
+ }
+ if (this.starting) {
+ throw new Error('Cannot start an already starting pool')
+ }
+ if (this.destroying) {
+ throw new Error('Cannot start a destroying pool')
+ }
+ this.starting = true
+ while (
+ this.workerNodes.reduce(
+ (accumulator, workerNode) =>
+ !workerNode.info.dynamic ? accumulator + 1 : accumulator,
+ 0
+ ) < this.minimumNumberOfWorkers
+ ) {
+ this.createAndSetupWorkerNode()
+ }
+ this.starting = false
+ this.started = true
+ }
+
+ /** @inheritDoc */
+ public async destroy (): Promise<void> {
+ if (!this.started) {
+ throw new Error('Cannot destroy an already destroyed pool')
+ }
+ if (this.starting) {
+ throw new Error('Cannot destroy an starting pool')
+ }
+ if (this.destroying) {
+ throw new Error('Cannot destroy an already destroying pool')
+ }
+ this.destroying = true
+ await Promise.all(
+ this.workerNodes.map(async (_workerNode, workerNodeKey) => {
+ await this.destroyWorkerNode(workerNodeKey)
+ })
+ )
+ this.emitter?.emit(PoolEvents.destroy, this.info)
+ this.emitter?.emitDestroy()
+ this.emitter?.removeAllListeners()
+ this.readyEventEmitted = false
+ this.destroying = false
+ this.started = false
+ }
+
+ private async sendKillMessageToWorker (workerNodeKey: number): Promise<void> {
+ await new Promise<void>((resolve, reject) => {
+ // eslint-disable-next-line @typescript-eslint/no-unnecessary-condition
+ if (this.workerNodes[workerNodeKey] == null) {
+ resolve()
+ return
+ }
+ const killMessageListener = (message: MessageValue<Response>): void => {
+ this.checkMessageWorkerId(message)
+ if (message.kill === 'success') {
+ resolve()
+ } else if (message.kill === 'failure') {
+ reject(
+ new Error(
+ `Kill message handling failed on worker ${message.workerId}`
+ )
+ )
+ }
+ }
+ // FIXME: should be registered only once
+ this.registerWorkerMessageListener(workerNodeKey, killMessageListener)
+ this.sendToWorker(workerNodeKey, { kill: true })
+ })
+ }
+
+ /**
+ * Terminates the worker node given its worker node key.
+ *
+ * @param workerNodeKey - The worker node key.
+ */
+ protected async destroyWorkerNode (workerNodeKey: number): Promise<void> {
+ this.flagWorkerNodeAsNotReady(workerNodeKey)
+ const flushedTasks = this.flushTasksQueue(workerNodeKey)
+ const workerNode = this.workerNodes[workerNodeKey]
+ await waitWorkerNodeEvents(
+ workerNode,
+ 'taskFinished',
+ flushedTasks,
+ this.opts.tasksQueueOptions?.tasksFinishedTimeout ??
+ getDefaultTasksQueueOptions(
+ this.maximumNumberOfWorkers ?? this.minimumNumberOfWorkers
+ ).tasksFinishedTimeout
+ )
+ await this.sendKillMessageToWorker(workerNodeKey)
+ await workerNode.terminate()
+ }
+
+ /**
+ * Setup hook to execute code before worker nodes are created in the abstract constructor.
+ * Can be overridden.
+ *
+ * @virtual
+ */
+ protected setupHook (): void {
+ /* Intentionally empty */
+ }
+
+ /**
+ * Should return whether the worker is the main worker or not.
+ */
+ protected abstract isMain (): boolean
+
+ /**
+ * Hook executed before the worker task execution.
+ * Can be overridden.
+ *
+ * @param workerNodeKey - The worker node key.
+ * @param task - The task to execute.
+ */
+ protected beforeTaskExecutionHook (
+ workerNodeKey: number,
+ task: Task<Data>
+ ): void {
+ // eslint-disable-next-line @typescript-eslint/no-unnecessary-condition
+ if (this.workerNodes[workerNodeKey]?.usage != null) {
+ const workerUsage = this.workerNodes[workerNodeKey].usage
+ ++workerUsage.tasks.executing
+ updateWaitTimeWorkerUsage(
+ this.workerChoiceStrategyContext,
+ workerUsage,
+ task
+ )
+ }
+ if (
+ this.shallUpdateTaskFunctionWorkerUsage(workerNodeKey) &&
+ // eslint-disable-next-line @typescript-eslint/no-non-null-assertion
+ this.workerNodes[workerNodeKey].getTaskFunctionWorkerUsage(task.name!) !=
+ null
+ ) {
+ // eslint-disable-next-line @typescript-eslint/no-non-null-assertion
+ const taskFunctionWorkerUsage = this.workerNodes[
+ workerNodeKey
+ // eslint-disable-next-line @typescript-eslint/no-non-null-assertion
+ ].getTaskFunctionWorkerUsage(task.name!)!
+ ++taskFunctionWorkerUsage.tasks.executing
+ updateWaitTimeWorkerUsage(
+ this.workerChoiceStrategyContext,
+ taskFunctionWorkerUsage,
+ task
+ )
}
}
- private updateEluWorkerUsage (
- workerUsage: WorkerUsage,
+ /**
+ * Hook executed after the worker task execution.
+ * Can be overridden.
+ *
+ * @param workerNodeKey - The worker node key.
+ * @param message - The received message.
+ */
+ protected afterTaskExecutionHook (
+ workerNodeKey: number,
message: MessageValue<Response>
): void {
+ let needWorkerChoiceStrategyUpdate = false
+ // eslint-disable-next-line @typescript-eslint/no-unnecessary-condition
+ if (this.workerNodes[workerNodeKey]?.usage != null) {
+ const workerUsage = this.workerNodes[workerNodeKey].usage
+ updateTaskStatisticsWorkerUsage(workerUsage, message)
+ updateRunTimeWorkerUsage(
+ this.workerChoiceStrategyContext,
+ workerUsage,
+ message
+ )
+ updateEluWorkerUsage(
+ this.workerChoiceStrategyContext,
+ workerUsage,
+ message
+ )
+ needWorkerChoiceStrategyUpdate = true
+ }
if (
- this.workerChoiceStrategyContext.getTaskStatisticsRequirements().elu
- .aggregate
+ this.shallUpdateTaskFunctionWorkerUsage(workerNodeKey) &&
+ this.workerNodes[workerNodeKey].getTaskFunctionWorkerUsage(
+ // eslint-disable-next-line @typescript-eslint/no-non-null-assertion
+ message.taskPerformance!.name
+ ) != null
) {
- if (message.taskPerformance?.elu != null) {
- workerUsage.elu.idle.aggregate =
- (workerUsage.elu.idle?.aggregate ?? 0) +
- message.taskPerformance.elu.idle
- workerUsage.elu.active.aggregate =
- (workerUsage.elu.active?.aggregate ?? 0) +
- message.taskPerformance.elu.active
- if (workerUsage.elu.utilization != null) {
- workerUsage.elu.utilization =
- (workerUsage.elu.utilization +
- message.taskPerformance.elu.utilization) /
- 2
- } else {
- workerUsage.elu.utilization = message.taskPerformance.elu.utilization
- }
- workerUsage.elu.idle.minimum = Math.min(
- message.taskPerformance.elu.idle,
- workerUsage.elu.idle?.minimum ?? Infinity
- )
- workerUsage.elu.idle.maximum = Math.max(
- message.taskPerformance.elu.idle,
- workerUsage.elu.idle?.maximum ?? -Infinity
- )
- workerUsage.elu.active.minimum = Math.min(
- message.taskPerformance.elu.active,
- workerUsage.elu.active?.minimum ?? Infinity
- )
- workerUsage.elu.active.maximum = Math.max(
- message.taskPerformance.elu.active,
- workerUsage.elu.active?.maximum ?? -Infinity
- )
- if (
- this.workerChoiceStrategyContext.getTaskStatisticsRequirements().elu
- .average &&
- workerUsage.tasks.executed !== 0
- ) {
- workerUsage.elu.idle.average =
- workerUsage.elu.idle.aggregate / workerUsage.tasks.executed
- workerUsage.elu.active.average =
- workerUsage.elu.active.aggregate / workerUsage.tasks.executed
- }
- if (
- this.workerChoiceStrategyContext.getTaskStatisticsRequirements().elu
- .median
- ) {
- workerUsage.elu.idle.history.push(message.taskPerformance.elu.idle)
- workerUsage.elu.active.history.push(
- message.taskPerformance.elu.active
- )
- workerUsage.elu.idle.median = median(workerUsage.elu.idle.history)
- workerUsage.elu.active.median = median(workerUsage.elu.active.history)
- }
- }
+ // eslint-disable-next-line @typescript-eslint/no-non-null-assertion
+ const taskFunctionWorkerUsage = this.workerNodes[
+ workerNodeKey
+ // eslint-disable-next-line @typescript-eslint/no-non-null-assertion
+ ].getTaskFunctionWorkerUsage(message.taskPerformance!.name)!
+ updateTaskStatisticsWorkerUsage(taskFunctionWorkerUsage, message)
+ updateRunTimeWorkerUsage(
+ this.workerChoiceStrategyContext,
+ taskFunctionWorkerUsage,
+ message
+ )
+ updateEluWorkerUsage(
+ this.workerChoiceStrategyContext,
+ taskFunctionWorkerUsage,
+ message
+ )
+ needWorkerChoiceStrategyUpdate = true
+ }
+ if (needWorkerChoiceStrategyUpdate) {
+ this.workerChoiceStrategyContext?.update(workerNodeKey)
}
}
+ /**
+ * Whether the worker node shall update its task function worker usage or not.
+ *
+ * @param workerNodeKey - The worker node key.
+ * @returns `true` if the worker node shall update its task function worker usage, `false` otherwise.
+ */
+ private shallUpdateTaskFunctionWorkerUsage (workerNodeKey: number): boolean {
+ const workerInfo = this.getWorkerInfo(workerNodeKey)
+ return (
+ workerInfo != null &&
+ Array.isArray(workerInfo.taskFunctionNames) &&
+ workerInfo.taskFunctionNames.length > 2
+ )
+ }
+
/**
* Chooses a worker node for the next task.
*
* The default worker choice strategy uses a round robin algorithm to distribute the tasks.
*
- * @returns The worker node key
+ * @returns The chosen worker node key
*/
private chooseWorkerNode (): number {
if (this.shallCreateDynamicWorker()) {
- const worker = this.createAndSetupDynamicWorker()
+ const workerNodeKey = this.createAndSetupDynamicWorkerNode()
if (
- this.workerChoiceStrategyContext.getStrategyPolicy().useDynamicWorker
+ this.workerChoiceStrategyContext?.getStrategyPolicy()
+ .dynamicWorkerUsage === true
) {
- return this.getWorkerNodeKey(worker)
+ return workerNodeKey
}
}
- return this.workerChoiceStrategyContext.execute()
+ // eslint-disable-next-line @typescript-eslint/no-non-null-assertion
+ return this.workerChoiceStrategyContext!.execute()
}
/**
*
* @returns Whether to create a dynamic worker or not.
*/
- private shallCreateDynamicWorker (): boolean {
- return this.type === PoolTypes.dynamic && !this.full && this.internalBusy()
- }
+ protected abstract shallCreateDynamicWorker (): boolean
/**
- * Sends a message to the given worker.
+ * Sends a message to worker given its worker node key.
*
- * @param worker - The worker which should receive the message.
+ * @param workerNodeKey - The worker node key.
* @param message - The message.
+ * @param transferList - The optional array of transferable objects.
*/
protected abstract sendToWorker (
- worker: Worker,
- message: MessageValue<Data>
+ workerNodeKey: number,
+ message: MessageValue<Data>,
+ transferList?: TransferListItem[]
): void
/**
- * Creates a new worker.
- *
- * @returns Newly created worker.
- */
- protected abstract createWorker (): Worker
-
- /**
- * Creates a new worker and sets it up completely in the pool worker nodes.
+ * Creates a new, completely set up worker node.
*
- * @returns New, completely set up worker.
+ * @returns New, completely set up worker node key.
*/
- protected createAndSetupWorker (): Worker {
- const worker = this.createWorker()
-
- worker.on('message', this.opts.messageHandler ?? EMPTY_FUNCTION)
- worker.on('error', this.opts.errorHandler ?? EMPTY_FUNCTION)
- worker.on('error', error => {
- const workerNodeKey = this.getWorkerNodeKey(worker)
- const workerInfo = this.getWorkerInfo(workerNodeKey)
- workerInfo.ready = false
- if (this.emitter != null) {
- this.emitter.emit(PoolEvents.error, error)
- }
- if (this.opts.restartWorkerOnError === true && !this.starting) {
- if (workerInfo.dynamic) {
- this.createAndSetupDynamicWorker()
+ protected createAndSetupWorkerNode (): number {
+ const workerNode = this.createWorkerNode()
+ workerNode.registerWorkerEventHandler(
+ 'online',
+ this.opts.onlineHandler ?? EMPTY_FUNCTION
+ )
+ workerNode.registerWorkerEventHandler(
+ 'message',
+ this.opts.messageHandler ?? EMPTY_FUNCTION
+ )
+ workerNode.registerWorkerEventHandler(
+ 'error',
+ this.opts.errorHandler ?? EMPTY_FUNCTION
+ )
+ workerNode.registerWorkerEventHandler('error', (error: Error) => {
+ workerNode.info.ready = false
+ this.emitter?.emit(PoolEvents.error, error)
+ if (
+ this.started &&
+ !this.destroying &&
+ this.opts.restartWorkerOnError === true
+ ) {
+ if (workerNode.info.dynamic) {
+ this.createAndSetupDynamicWorkerNode()
} else {
- this.createAndSetupWorker()
+ this.createAndSetupWorkerNode()
}
}
- if (this.opts.enableTasksQueue === true) {
- this.redistributeQueuedTasks(workerNodeKey)
+ if (
+ this.started &&
+ !this.destroying &&
+ this.opts.enableTasksQueue === true
+ ) {
+ this.redistributeQueuedTasks(this.workerNodes.indexOf(workerNode))
}
+ // eslint-disable-next-line @typescript-eslint/no-unnecessary-condition
+ workerNode?.terminate().catch(error => {
+ this.emitter?.emit(PoolEvents.error, error)
+ })
})
- worker.on('online', this.opts.onlineHandler ?? EMPTY_FUNCTION)
- worker.on('exit', this.opts.exitHandler ?? EMPTY_FUNCTION)
- worker.once('exit', () => {
- this.removeWorkerNode(worker)
+ workerNode.registerWorkerEventHandler(
+ 'exit',
+ this.opts.exitHandler ?? EMPTY_FUNCTION
+ )
+ workerNode.registerOnceWorkerEventHandler('exit', () => {
+ this.removeWorkerNode(workerNode)
})
-
- this.addWorkerNode(worker)
-
- this.afterWorkerSetup(worker)
-
- return worker
+ const workerNodeKey = this.addWorkerNode(workerNode)
+ this.afterWorkerNodeSetup(workerNodeKey)
+ return workerNodeKey
}
/**
- * Creates a new dynamic worker and sets it up completely in the pool worker nodes.
+ * Creates a new, completely set up dynamic worker node.
*
- * @returns New, completely set up dynamic worker.
+ * @returns New, completely set up dynamic worker node key.
*/
- protected createAndSetupDynamicWorker (): Worker {
- const worker = this.createAndSetupWorker()
- this.registerWorkerMessageListener(worker, message => {
- const workerNodeKey = this.getWorkerNodeKey(worker)
+ protected createAndSetupDynamicWorkerNode (): number {
+ const workerNodeKey = this.createAndSetupWorkerNode()
+ this.registerWorkerMessageListener(workerNodeKey, message => {
+ this.checkMessageWorkerId(message)
+ const localWorkerNodeKey = this.getWorkerNodeKeyByWorkerId(
+ message.workerId
+ )
+ const workerUsage = this.workerNodes[localWorkerNodeKey]?.usage
+ // Kill message received from worker
if (
isKillBehavior(KillBehaviors.HARD, message.kill) ||
- (message.kill != null &&
+ (isKillBehavior(KillBehaviors.SOFT, message.kill) &&
((this.opts.enableTasksQueue === false &&
- this.workerNodes[workerNodeKey].usage.tasks.executing === 0) ||
+ workerUsage.tasks.executing === 0) ||
(this.opts.enableTasksQueue === true &&
- this.workerNodes[workerNodeKey].usage.tasks.executing === 0 &&
- this.tasksQueueSize(workerNodeKey) === 0)))
+ workerUsage.tasks.executing === 0 &&
+ this.tasksQueueSize(localWorkerNodeKey) === 0)))
) {
- // Kill message received from the worker: no new tasks are submitted to that worker for a while ( > maxInactiveTime)
- void (this.destroyWorker(worker) as Promise<void>)
+ // Flag the worker node as not ready immediately
+ this.flagWorkerNodeAsNotReady(localWorkerNodeKey)
+ this.destroyWorkerNode(localWorkerNodeKey).catch(error => {
+ this.emitter?.emit(PoolEvents.error, error)
+ })
}
})
- const workerInfo = this.getWorkerInfo(this.getWorkerNodeKey(worker))
- workerInfo.dynamic = true
- if (this.workerChoiceStrategyContext.getStrategyPolicy().useDynamicWorker) {
- workerInfo.ready = true
- }
- this.sendToWorker(worker, {
- checkActive: true,
- workerId: workerInfo.id as number
+ this.sendToWorker(workerNodeKey, {
+ checkActive: true
})
- return worker
+ if (this.taskFunctions.size > 0) {
+ for (const [taskFunctionName, taskFunction] of this.taskFunctions) {
+ this.sendTaskFunctionOperationToWorker(workerNodeKey, {
+ taskFunctionOperation: 'add',
+ taskFunctionName,
+ taskFunction: taskFunction.toString()
+ }).catch(error => {
+ this.emitter?.emit(PoolEvents.error, error)
+ })
+ }
+ }
+ const workerNode = this.workerNodes[workerNodeKey]
+ workerNode.info.dynamic = true
+ if (
+ this.workerChoiceStrategyContext?.getStrategyPolicy()
+ .dynamicWorkerReady === true ||
+ this.workerChoiceStrategyContext?.getStrategyPolicy()
+ .dynamicWorkerUsage === true
+ ) {
+ workerNode.info.ready = true
+ }
+ this.checkAndEmitDynamicWorkerCreationEvents()
+ return workerNodeKey
}
/**
- * Registers a listener callback on the given worker.
+ * Registers a listener callback on the worker given its worker node key.
*
- * @param worker - The worker which should register a listener.
+ * @param workerNodeKey - The worker node key.
* @param listener - The message listener callback.
*/
- private registerWorkerMessageListener<Message extends Data | Response>(
- worker: Worker,
+ protected abstract registerWorkerMessageListener<
+ Message extends Data | Response
+ >(
+ workerNodeKey: number,
listener: (message: MessageValue<Message>) => void
- ): void {
- worker.on('message', listener as MessageHandler<Worker>)
- }
+ ): void
+
+ /**
+ * Registers once a listener callback on the worker given its worker node key.
+ *
+ * @param workerNodeKey - The worker node key.
+ * @param listener - The message listener callback.
+ */
+ protected abstract registerOnceWorkerMessageListener<
+ Message extends Data | Response
+ >(
+ workerNodeKey: number,
+ listener: (message: MessageValue<Message>) => void
+ ): void
+
+ /**
+ * Deregisters a listener callback on the worker given its worker node key.
+ *
+ * @param workerNodeKey - The worker node key.
+ * @param listener - The message listener callback.
+ */
+ protected abstract deregisterWorkerMessageListener<
+ Message extends Data | Response
+ >(
+ workerNodeKey: number,
+ listener: (message: MessageValue<Message>) => void
+ ): void
/**
- * Function that can be hooked up when a worker has been newly created and moved to the pool worker nodes.
+ * Method hooked up after a worker node has been newly created.
* Can be overridden.
*
- * @param worker - The newly created worker.
+ * @param workerNodeKey - The newly created worker node key.
*/
- protected afterWorkerSetup (worker: Worker): void {
+ protected afterWorkerNodeSetup (workerNodeKey: number): void {
// Listen to worker messages.
- this.registerWorkerMessageListener(worker, this.workerListener())
- // Send startup message to worker.
- this.sendWorkerStartupMessage(worker)
- // Setup worker task statistics computation.
- this.setWorkerStatistics(worker)
+ this.registerWorkerMessageListener(
+ workerNodeKey,
+ this.workerMessageListener
+ )
+ // Send the startup message to worker.
+ this.sendStartupMessageToWorker(workerNodeKey)
+ // Send the statistics message to worker.
+ this.sendStatisticsMessageToWorker(workerNodeKey)
+ if (this.opts.enableTasksQueue === true) {
+ if (this.opts.tasksQueueOptions?.taskStealing === true) {
+ this.workerNodes[workerNodeKey].on(
+ 'idle',
+ this.handleWorkerNodeIdleEvent
+ )
+ }
+ if (this.opts.tasksQueueOptions?.tasksStealingOnBackPressure === true) {
+ this.workerNodes[workerNodeKey].on(
+ 'backPressure',
+ this.handleWorkerNodeBackPressureEvent
+ )
+ }
+ }
}
- private sendWorkerStartupMessage (worker: Worker): void {
- this.sendToWorker(worker, {
- ready: false,
- workerId: this.getWorkerInfo(this.getWorkerNodeKey(worker)).id as number
+ /**
+ * Sends the startup message to worker given its worker node key.
+ *
+ * @param workerNodeKey - The worker node key.
+ */
+ protected abstract sendStartupMessageToWorker (workerNodeKey: number): void
+
+ /**
+ * Sends the statistics message to worker given its worker node key.
+ *
+ * @param workerNodeKey - The worker node key.
+ */
+ private sendStatisticsMessageToWorker (workerNodeKey: number): void {
+ this.sendToWorker(workerNodeKey, {
+ statistics: {
+ runTime:
+ this.workerChoiceStrategyContext?.getTaskStatisticsRequirements()
+ .runTime.aggregate ?? false,
+ elu:
+ this.workerChoiceStrategyContext?.getTaskStatisticsRequirements().elu
+ .aggregate ?? false
+ }
})
}
+ private cannotStealTask (): boolean {
+ return this.workerNodes.length <= 1 || this.info.queuedTasks === 0
+ }
+
+ private handleTask (workerNodeKey: number, task: Task<Data>): void {
+ if (this.shallExecuteTask(workerNodeKey)) {
+ this.executeTask(workerNodeKey, task)
+ } else {
+ this.enqueueTask(workerNodeKey, task)
+ }
+ }
+
private redistributeQueuedTasks (workerNodeKey: number): void {
+ if (workerNodeKey === -1 || this.cannotStealTask()) {
+ return
+ }
while (this.tasksQueueSize(workerNodeKey) > 0) {
- let targetWorkerNodeKey: number = workerNodeKey
- let minQueuedTasks = Infinity
- for (const [workerNodeId, workerNode] of this.workerNodes.entries()) {
- const workerInfo = this.getWorkerInfo(workerNodeId)
- if (
- workerNodeId !== workerNodeKey &&
- workerInfo.ready &&
- workerNode.usage.tasks.queued === 0
- ) {
- targetWorkerNodeKey = workerNodeId
- break
- }
- if (
- workerNodeId !== workerNodeKey &&
- workerInfo.ready &&
- workerNode.usage.tasks.queued < minQueuedTasks
- ) {
- minQueuedTasks = workerNode.usage.tasks.queued
- targetWorkerNodeKey = workerNodeId
- }
+ const destinationWorkerNodeKey = this.workerNodes.reduce(
+ (minWorkerNodeKey, workerNode, workerNodeKey, workerNodes) => {
+ return workerNode.info.ready &&
+ workerNode.usage.tasks.queued <
+ workerNodes[minWorkerNodeKey].usage.tasks.queued
+ ? workerNodeKey
+ : minWorkerNodeKey
+ },
+ 0
+ )
+ this.handleTask(
+ destinationWorkerNodeKey,
+ // eslint-disable-next-line @typescript-eslint/no-non-null-assertion
+ this.dequeueTask(workerNodeKey)!
+ )
+ }
+ }
+
+ private updateTaskStolenStatisticsWorkerUsage (
+ workerNodeKey: number,
+ taskName: string
+ ): void {
+ const workerNode = this.workerNodes[workerNodeKey]
+ // eslint-disable-next-line @typescript-eslint/no-unnecessary-condition
+ if (workerNode?.usage != null) {
+ ++workerNode.usage.tasks.stolen
+ }
+ if (
+ this.shallUpdateTaskFunctionWorkerUsage(workerNodeKey) &&
+ workerNode.getTaskFunctionWorkerUsage(taskName) != null
+ ) {
+ const taskFunctionWorkerUsage =
+ // eslint-disable-next-line @typescript-eslint/no-non-null-assertion
+ workerNode.getTaskFunctionWorkerUsage(taskName)!
+ ++taskFunctionWorkerUsage.tasks.stolen
+ }
+ }
+
+ private updateTaskSequentiallyStolenStatisticsWorkerUsage (
+ workerNodeKey: number
+ ): void {
+ const workerNode = this.workerNodes[workerNodeKey]
+ // eslint-disable-next-line @typescript-eslint/no-unnecessary-condition
+ if (workerNode?.usage != null) {
+ ++workerNode.usage.tasks.sequentiallyStolen
+ }
+ }
+
+ private updateTaskSequentiallyStolenStatisticsTaskFunctionWorkerUsage (
+ workerNodeKey: number,
+ taskName: string
+ ): void {
+ const workerNode = this.workerNodes[workerNodeKey]
+ if (
+ this.shallUpdateTaskFunctionWorkerUsage(workerNodeKey) &&
+ workerNode.getTaskFunctionWorkerUsage(taskName) != null
+ ) {
+ const taskFunctionWorkerUsage =
+ // eslint-disable-next-line @typescript-eslint/no-non-null-assertion
+ workerNode.getTaskFunctionWorkerUsage(taskName)!
+ ++taskFunctionWorkerUsage.tasks.sequentiallyStolen
+ }
+ }
+
+ private resetTaskSequentiallyStolenStatisticsWorkerUsage (
+ workerNodeKey: number
+ ): void {
+ const workerNode = this.workerNodes[workerNodeKey]
+ // eslint-disable-next-line @typescript-eslint/no-unnecessary-condition
+ if (workerNode?.usage != null) {
+ workerNode.usage.tasks.sequentiallyStolen = 0
+ }
+ }
+
+ private resetTaskSequentiallyStolenStatisticsTaskFunctionWorkerUsage (
+ workerNodeKey: number,
+ taskName: string
+ ): void {
+ const workerNode = this.workerNodes[workerNodeKey]
+ if (
+ this.shallUpdateTaskFunctionWorkerUsage(workerNodeKey) &&
+ workerNode.getTaskFunctionWorkerUsage(taskName) != null
+ ) {
+ const taskFunctionWorkerUsage =
+ // eslint-disable-next-line @typescript-eslint/no-non-null-assertion
+ workerNode.getTaskFunctionWorkerUsage(taskName)!
+ taskFunctionWorkerUsage.tasks.sequentiallyStolen = 0
+ }
+ }
+
+ private readonly handleWorkerNodeIdleEvent = (
+ eventDetail: WorkerNodeEventDetail,
+ previousStolenTask?: Task<Data>
+ ): void => {
+ const { workerNodeKey } = eventDetail
+ if (workerNodeKey == null) {
+ throw new Error(
+ "WorkerNode event detail 'workerNodeKey' property must be defined"
+ )
+ }
+ const workerInfo = this.getWorkerInfo(workerNodeKey)
+ if (
+ this.cannotStealTask() ||
+ (this.info.stealingWorkerNodes ?? 0) >
+ Math.floor(this.workerNodes.length / 2)
+ ) {
+ if (workerInfo != null && previousStolenTask != null) {
+ workerInfo.stealing = false
}
- this.enqueueTask(
- targetWorkerNodeKey,
- this.dequeueTask(workerNodeKey) as Task<Data>
+ return
+ }
+ const workerNodeTasksUsage = this.workerNodes[workerNodeKey].usage.tasks
+ if (
+ workerInfo != null &&
+ previousStolenTask != null &&
+ workerNodeTasksUsage.sequentiallyStolen > 0 &&
+ (workerNodeTasksUsage.executing > 0 ||
+ this.tasksQueueSize(workerNodeKey) > 0)
+ ) {
+ workerInfo.stealing = false
+ // eslint-disable-next-line @typescript-eslint/no-non-null-assertion
+ for (const taskName of this.workerNodes[workerNodeKey].info
+ .taskFunctionNames!) {
+ this.resetTaskSequentiallyStolenStatisticsTaskFunctionWorkerUsage(
+ workerNodeKey,
+ taskName
+ )
+ }
+ this.resetTaskSequentiallyStolenStatisticsWorkerUsage(workerNodeKey)
+ return
+ }
+ if (workerInfo == null) {
+ throw new Error(
+ `Worker node with key '${workerNodeKey}' not found in pool`
+ )
+ }
+ workerInfo.stealing = true
+ const stolenTask = this.workerNodeStealTask(workerNodeKey)
+ if (
+ this.shallUpdateTaskFunctionWorkerUsage(workerNodeKey) &&
+ stolenTask != null
+ ) {
+ // eslint-disable-next-line @typescript-eslint/no-non-null-assertion
+ const taskFunctionTasksWorkerUsage = this.workerNodes[
+ workerNodeKey
+ // eslint-disable-next-line @typescript-eslint/no-non-null-assertion
+ ].getTaskFunctionWorkerUsage(stolenTask.name!)!.tasks
+ if (
+ taskFunctionTasksWorkerUsage.sequentiallyStolen === 0 ||
+ (previousStolenTask != null &&
+ previousStolenTask.name === stolenTask.name &&
+ taskFunctionTasksWorkerUsage.sequentiallyStolen > 0)
+ ) {
+ this.updateTaskSequentiallyStolenStatisticsTaskFunctionWorkerUsage(
+ workerNodeKey,
+ // eslint-disable-next-line @typescript-eslint/no-non-null-assertion
+ stolenTask.name!
+ )
+ } else {
+ this.resetTaskSequentiallyStolenStatisticsTaskFunctionWorkerUsage(
+ workerNodeKey,
+ // eslint-disable-next-line @typescript-eslint/no-non-null-assertion
+ stolenTask.name!
+ )
+ }
+ }
+ sleep(exponentialDelay(workerNodeTasksUsage.sequentiallyStolen))
+ .then(() => {
+ this.handleWorkerNodeIdleEvent(eventDetail, stolenTask)
+ return undefined
+ })
+ .catch(error => {
+ this.emitter?.emit(PoolEvents.error, error)
+ })
+ }
+
+ private readonly workerNodeStealTask = (
+ workerNodeKey: number
+ ): Task<Data> | undefined => {
+ const workerNodes = this.workerNodes
+ .slice()
+ .sort(
+ (workerNodeA, workerNodeB) =>
+ workerNodeB.usage.tasks.queued - workerNodeA.usage.tasks.queued
)
+ const sourceWorkerNode = workerNodes.find(
+ (sourceWorkerNode, sourceWorkerNodeKey) =>
+ sourceWorkerNode.info.ready &&
+ !sourceWorkerNode.info.stealing &&
+ sourceWorkerNodeKey !== workerNodeKey &&
+ sourceWorkerNode.usage.tasks.queued > 0
+ )
+ if (sourceWorkerNode != null) {
+ // eslint-disable-next-line @typescript-eslint/no-non-null-assertion
+ const task = sourceWorkerNode.popTask()!
+ this.handleTask(workerNodeKey, task)
+ this.updateTaskSequentiallyStolenStatisticsWorkerUsage(workerNodeKey)
+ // eslint-disable-next-line @typescript-eslint/no-non-null-assertion
+ this.updateTaskStolenStatisticsWorkerUsage(workerNodeKey, task.name!)
+ return task
+ }
+ }
+
+ private readonly handleWorkerNodeBackPressureEvent = (
+ eventDetail: WorkerNodeEventDetail
+ ): void => {
+ if (
+ this.cannotStealTask() ||
+ (this.info.stealingWorkerNodes ?? 0) >
+ Math.floor(this.workerNodes.length / 2)
+ ) {
+ return
+ }
+ const { workerId } = eventDetail
+ const sizeOffset = 1
+ // eslint-disable-next-line @typescript-eslint/no-non-null-assertion
+ if (this.opts.tasksQueueOptions!.size! <= sizeOffset) {
+ return
+ }
+ const sourceWorkerNode =
+ this.workerNodes[this.getWorkerNodeKeyByWorkerId(workerId)]
+ const workerNodes = this.workerNodes
+ .slice()
+ .sort(
+ (workerNodeA, workerNodeB) =>
+ workerNodeA.usage.tasks.queued - workerNodeB.usage.tasks.queued
+ )
+ for (const [workerNodeKey, workerNode] of workerNodes.entries()) {
+ if (
+ sourceWorkerNode.usage.tasks.queued > 0 &&
+ workerNode.info.ready &&
+ !workerNode.info.stealing &&
+ workerNode.info.id !== workerId &&
+ workerNode.usage.tasks.queued <
+ // eslint-disable-next-line @typescript-eslint/no-non-null-assertion
+ this.opts.tasksQueueOptions!.size! - sizeOffset
+ ) {
+ const workerInfo = this.getWorkerInfo(workerNodeKey)
+ if (workerInfo == null) {
+ throw new Error(
+ `Worker node with key '${workerNodeKey}' not found in pool`
+ )
+ }
+ workerInfo.stealing = true
+ // eslint-disable-next-line @typescript-eslint/no-non-null-assertion
+ const task = sourceWorkerNode.popTask()!
+ this.handleTask(workerNodeKey, task)
+ // eslint-disable-next-line @typescript-eslint/no-non-null-assertion
+ this.updateTaskStolenStatisticsWorkerUsage(workerNodeKey, task.name!)
+ workerInfo.stealing = false
+ }
}
}
/**
- * This function is the listener registered for each worker message.
- *
- * @returns The listener function to execute when a message is received from a worker.
+ * This method is the message listener registered on each worker.
*/
- protected workerListener (): (message: MessageValue<Response>) => void {
- return message => {
- this.checkMessageWorkerId(message)
- if (message.ready != null) {
- // Worker ready response received
- this.handleWorkerReadyResponse(message)
- } else if (message.id != null) {
- // Task execution response received
- this.handleTaskExecutionResponse(message)
+ protected readonly workerMessageListener = (
+ message: MessageValue<Response>
+ ): void => {
+ this.checkMessageWorkerId(message)
+ const { workerId, ready, taskId, taskFunctionNames } = message
+ if (ready != null && taskFunctionNames != null) {
+ // Worker ready response received from worker
+ this.handleWorkerReadyResponse(message)
+ } else if (taskId != null) {
+ // Task execution response received from worker
+ this.handleTaskExecutionResponse(message)
+ } else if (taskFunctionNames != null) {
+ // Task function names message received from worker
+ const workerInfo = this.getWorkerInfo(
+ this.getWorkerNodeKeyByWorkerId(workerId)
+ )
+ if (workerInfo != null) {
+ workerInfo.taskFunctionNames = taskFunctionNames
}
}
}
+ private checkAndEmitReadyEvent (): void {
+ if (!this.readyEventEmitted && this.ready) {
+ this.emitter?.emit(PoolEvents.ready, this.info)
+ this.readyEventEmitted = true
+ }
+ }
+
private handleWorkerReadyResponse (message: MessageValue<Response>): void {
- const worker = this.getWorkerById(message.workerId)
- this.getWorkerInfo(this.getWorkerNodeKey(worker as Worker)).ready =
- message.ready as boolean
- if (this.emitter != null && this.ready) {
- this.emitter.emit(PoolEvents.ready, this.info)
+ const { workerId, ready, taskFunctionNames } = message
+ if (ready == null || !ready) {
+ throw new Error(`Worker ${workerId} failed to initialize`)
}
+ const workerNode =
+ this.workerNodes[this.getWorkerNodeKeyByWorkerId(workerId)]
+ workerNode.info.ready = ready
+ workerNode.info.taskFunctionNames = taskFunctionNames
+ this.checkAndEmitReadyEvent()
}
private handleTaskExecutionResponse (message: MessageValue<Response>): void {
- const promiseResponse = this.promiseResponseMap.get(message.id as string)
+ const { workerId, taskId, workerError, data } = message
+ // eslint-disable-next-line @typescript-eslint/no-non-null-assertion
+ const promiseResponse = this.promiseResponseMap.get(taskId!)
if (promiseResponse != null) {
- if (message.taskError != null) {
- if (this.emitter != null) {
- this.emitter.emit(PoolEvents.taskError, message.taskError)
- }
- promiseResponse.reject(message.taskError.message)
+ const { resolve, reject, workerNodeKey, asyncResource } = promiseResponse
+ const workerNode = this.workerNodes[workerNodeKey]
+ if (workerError != null) {
+ this.emitter?.emit(PoolEvents.taskError, workerError)
+ asyncResource != null
+ ? asyncResource.runInAsyncScope(
+ reject,
+ this.emitter,
+ workerError.message
+ )
+ : reject(workerError.message)
} else {
- promiseResponse.resolve(message.data as Response)
+ asyncResource != null
+ ? asyncResource.runInAsyncScope(resolve, this.emitter, data)
+ : resolve(data as Response)
}
- this.afterTaskExecutionHook(promiseResponse.worker, message)
- this.promiseResponseMap.delete(message.id as string)
- const workerNodeKey = this.getWorkerNodeKey(promiseResponse.worker)
+ asyncResource?.emitDestroy()
+ this.afterTaskExecutionHook(workerNodeKey, message)
+ // eslint-disable-next-line @typescript-eslint/no-non-null-assertion
+ this.promiseResponseMap.delete(taskId!)
+ // eslint-disable-next-line @typescript-eslint/no-unnecessary-condition
+ workerNode?.emit('taskFinished', taskId)
if (
this.opts.enableTasksQueue === true &&
- this.tasksQueueSize(workerNodeKey) > 0
+ !this.destroying &&
+ // eslint-disable-next-line @typescript-eslint/no-unnecessary-condition
+ workerNode != null
) {
- this.executeTask(
- workerNodeKey,
- this.dequeueTask(workerNodeKey) as Task<Data>
- )
+ const workerNodeTasksUsage = workerNode.usage.tasks
+ if (
+ this.tasksQueueSize(workerNodeKey) > 0 &&
+ workerNodeTasksUsage.executing <
+ // eslint-disable-next-line @typescript-eslint/no-non-null-assertion
+ this.opts.tasksQueueOptions!.concurrency!
+ ) {
+ // eslint-disable-next-line @typescript-eslint/no-non-null-assertion
+ this.executeTask(workerNodeKey, this.dequeueTask(workerNodeKey)!)
+ }
+ if (
+ workerNodeTasksUsage.executing === 0 &&
+ this.tasksQueueSize(workerNodeKey) === 0 &&
+ workerNodeTasksUsage.sequentiallyStolen === 0
+ ) {
+ workerNode.emit('idle', {
+ workerId,
+ workerNodeKey
+ })
+ }
}
- this.workerChoiceStrategyContext.update(workerNodeKey)
}
}
- private checkAndEmitEvents (): void {
- if (this.emitter != null) {
- if (this.busy) {
- this.emitter.emit(PoolEvents.busy, this.info)
- }
- if (this.type === PoolTypes.dynamic && this.full) {
- this.emitter.emit(PoolEvents.full, this.info)
- }
+ private checkAndEmitTaskExecutionEvents (): void {
+ if (this.busy) {
+ this.emitter?.emit(PoolEvents.busy, this.info)
}
}
+ private checkAndEmitTaskQueuingEvents (): void {
+ if (this.hasBackPressure()) {
+ this.emitter?.emit(PoolEvents.backPressure, this.info)
+ }
+ }
+
+ /**
+ * Emits dynamic worker creation events.
+ */
+ protected abstract checkAndEmitDynamicWorkerCreationEvents (): void
+
/**
- * Gets the worker information.
+ * Gets the worker information given its worker node key.
*
* @param workerNodeKey - The worker node key.
+ * @returns The worker information.
*/
- private getWorkerInfo (workerNodeKey: number): WorkerInfo {
- return this.workerNodes[workerNodeKey].info
+ protected getWorkerInfo (workerNodeKey: number): WorkerInfo | undefined {
+ return this.workerNodes[workerNodeKey]?.info
}
/**
- * Adds the given worker in the pool worker nodes.
+ * Creates a worker node.
*
- * @param worker - The worker.
- * @returns The worker nodes length.
+ * @returns The created worker node.
*/
- private addWorkerNode (worker: Worker): number {
- const workerNode = new WorkerNode<Worker, Data>(worker, this.worker)
+ private createWorkerNode (): IWorkerNode<Worker, Data> {
+ const workerNode = new WorkerNode<Worker, Data>(
+ this.worker,
+ this.filePath,
+ {
+ env: this.opts.env,
+ workerOptions: this.opts.workerOptions,
+ tasksQueueBackPressureSize:
+ this.opts.tasksQueueOptions?.size ??
+ getDefaultTasksQueueOptions(
+ this.maximumNumberOfWorkers ?? this.minimumNumberOfWorkers
+ ).size
+ }
+ )
// Flag the worker node as ready at pool startup.
if (this.starting) {
workerNode.info.ready = true
}
- return this.workerNodes.push(workerNode)
+ return workerNode
+ }
+
+ /**
+ * Adds the given worker node in the pool worker nodes.
+ *
+ * @param workerNode - The worker node.
+ * @returns The added worker node key.
+ * @throws {@link https://nodejs.org/api/errors.html#class-error} If the added worker node is not found.
+ */
+ private addWorkerNode (workerNode: IWorkerNode<Worker, Data>): number {
+ this.workerNodes.push(workerNode)
+ const workerNodeKey = this.workerNodes.indexOf(workerNode)
+ if (workerNodeKey === -1) {
+ throw new Error('Worker added not found in worker nodes')
+ }
+ return workerNodeKey
+ }
+
+ private checkAndEmitEmptyEvent (): void {
+ if (this.empty) {
+ this.emitter?.emit(PoolEvents.empty, this.info)
+ this.readyEventEmitted = false
+ }
}
/**
- * Removes the given worker from the pool worker nodes.
+ * Removes the worker node from the pool worker nodes.
*
- * @param worker - The worker.
+ * @param workerNode - The worker node.
*/
- private removeWorkerNode (worker: Worker): void {
- const workerNodeKey = this.getWorkerNodeKey(worker)
+ private removeWorkerNode (workerNode: IWorkerNode<Worker, Data>): void {
+ const workerNodeKey = this.workerNodes.indexOf(workerNode)
if (workerNodeKey !== -1) {
this.workerNodes.splice(workerNodeKey, 1)
- this.workerChoiceStrategyContext.remove(workerNodeKey)
+ this.workerChoiceStrategyContext?.remove(workerNodeKey)
}
+ this.checkAndEmitEmptyEvent()
+ }
+
+ protected flagWorkerNodeAsNotReady (workerNodeKey: number): void {
+ const workerInfo = this.getWorkerInfo(workerNodeKey)
+ if (workerInfo != null) {
+ workerInfo.ready = false
+ }
+ }
+
+ private hasBackPressure (): boolean {
+ return (
+ this.opts.enableTasksQueue === true &&
+ this.workerNodes.findIndex(
+ workerNode => !workerNode.hasBackPressure()
+ ) === -1
+ )
}
/**
- * Executes the given task on the given worker.
+ * Executes the given task on the worker given its worker node key.
*
- * @param worker - The worker.
+ * @param workerNodeKey - The worker node key.
* @param task - The task to execute.
*/
private executeTask (workerNodeKey: number, task: Task<Data>): void {
this.beforeTaskExecutionHook(workerNodeKey, task)
- this.sendToWorker(this.workerNodes[workerNodeKey].worker, task)
+ this.sendToWorker(workerNodeKey, task, task.transferList)
+ this.checkAndEmitTaskExecutionEvents()
}
private enqueueTask (workerNodeKey: number, task: Task<Data>): number {
- return this.workerNodes[workerNodeKey].enqueueTask(task)
+ const tasksQueueSize = this.workerNodes[workerNodeKey].enqueueTask(task)
+ this.checkAndEmitTaskQueuingEvents()
+ return tasksQueueSize
}
private dequeueTask (workerNodeKey: number): Task<Data> | undefined {
return this.workerNodes[workerNodeKey].tasksQueueSize()
}
- private flushTasksQueue (workerNodeKey: number): void {
+ protected flushTasksQueue (workerNodeKey: number): number {
+ let flushedTasks = 0
while (this.tasksQueueSize(workerNodeKey) > 0) {
- this.executeTask(
- workerNodeKey,
- this.dequeueTask(workerNodeKey) as Task<Data>
- )
+ // eslint-disable-next-line @typescript-eslint/no-non-null-assertion
+ this.executeTask(workerNodeKey, this.dequeueTask(workerNodeKey)!)
+ ++flushedTasks
}
this.workerNodes[workerNodeKey].clearTasksQueue()
+ return flushedTasks
}
private flushTasksQueues (): void {
this.flushTasksQueue(workerNodeKey)
}
}
-
- private setWorkerStatistics (worker: Worker): void {
- this.sendToWorker(worker, {
- statistics: {
- runTime:
- this.workerChoiceStrategyContext.getTaskStatisticsRequirements()
- .runTime.aggregate,
- elu: this.workerChoiceStrategyContext.getTaskStatisticsRequirements()
- .elu.aggregate
- },
- workerId: this.getWorkerInfo(this.getWorkerNodeKey(worker)).id as number
- })
- }
}
repositories / poolifier.git / blobdiff