-import crypto from 'node:crypto'
+import { randomUUID } from 'node:crypto'
import { performance } from 'node:perf_hooks'
-import type { MessageValue, PromiseResponseWrapper } from '../utility-types'
+import { existsSync } from 'node:fs'
+import { type TransferListItem } from 'node:worker_threads'
+import type {
+ MessageValue,
+ PromiseResponseWrapper,
+ Task
+} from '../utility-types'
import {
+ DEFAULT_TASK_NAME,
DEFAULT_WORKER_CHOICE_STRATEGY_OPTIONS,
EMPTY_FUNCTION,
+ average,
+ isKillBehavior,
isPlainObject,
- median
+ max,
+ median,
+ min,
+ round,
+ updateMeasurementStatistics
} from '../utils'
-import { KillBehaviors, isKillBehavior } from '../worker/worker-options'
-import { CircularArray } from '../circular-array'
-import { Queue } from '../queue'
+import { KillBehaviors } from '../worker/worker-options'
+import type { TaskFunction } from '../worker/task-functions'
import {
type IPool,
PoolEmitter,
type PoolOptions,
type PoolType,
PoolTypes,
- type TasksQueueOptions,
- type WorkerType
+ type TasksQueueOptions
} from './pool'
import type {
IWorker,
- Task,
- TaskStatistics,
- WorkerNode,
+ IWorkerNode,
+ WorkerInfo,
+ WorkerType,
WorkerUsage
} from './worker'
import {
+ type MeasurementStatisticsRequirements,
+ 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'
/**
* Base class that implements some shared logic for all poolifier pools.
*
* @typeParam Worker - Type of worker which manages this pool.
- * @typeParam Data - Type of data sent to the worker. This can only be serializable data.
- * @typeParam Response - Type of execution response. This can only be serializable data.
+ * @typeParam Data - Type of data sent to the worker. This can only be structured-cloneable data.
+ * @typeParam Response - Type of execution response. This can only be structured-cloneable data.
*/
export abstract class AbstractPool<
Worker extends IWorker,
Response = unknown
> implements IPool<Worker, Data, Response> {
/** @inheritDoc */
- public readonly workerNodes: Array<WorkerNode<Worker, Data>> = []
+ public readonly workerNodes: Array<IWorkerNode<Worker, Data>> = []
/** @inheritDoc */
public readonly emitter?: PoolEmitter
/**
- * 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.
Response
>
+ /**
+ * Dynamic pool maximum size property placeholder.
+ */
+ protected readonly max?: number
+
+ /**
+ * Whether the pool is starting or not.
+ */
+ private readonly starting: boolean
+ /**
+ * Whether the pool is started or not.
+ */
+ private started: boolean
+ /**
+ * The start timestamp of the pool.
+ */
+ private readonly startTimestamp
+
/**
* Constructs a new poolifier pool.
*
protected readonly opts: PoolOptions<Worker>
) {
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.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.setupHook()
- for (let i = 1; i <= this.numberOfWorkers; i++) {
- this.createAndSetupWorker()
- }
+ this.starting = true
+ this.startPool()
+ this.starting = false
+ this.started = true
+
+ 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 checkNumberOfWorkers (numberOfWorkers: number): void {
'Cannot instantiate a pool with a negative number of workers'
)
} else if (this.type === PoolTypes.fixed && numberOfWorkers === 0) {
- throw new Error('Cannot instantiate a fixed pool with no worker')
+ throw new RangeError('Cannot instantiate a fixed pool with zero worker')
+ }
+ }
+
+ protected checkDynamicPoolSize (min: number, max: number): void {
+ if (this.type === PoolTypes.dynamic) {
+ if (max == null) {
+ throw new TypeError(
+ 'Cannot instantiate a dynamic pool without specifying the maximum pool size'
+ )
+ } else if (!Number.isSafeInteger(max)) {
+ throw new TypeError(
+ 'Cannot instantiate a dynamic pool with a non safe integer maximum pool size'
+ )
+ } else 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 maximum 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'
+ )
+ }
}
}
this.opts.workerChoiceStrategy =
opts.workerChoiceStrategy ?? WorkerChoiceStrategies.ROUND_ROBIN
this.checkValidWorkerChoiceStrategy(this.opts.workerChoiceStrategy)
- this.opts.workerChoiceStrategyOptions =
- opts.workerChoiceStrategyOptions ??
- DEFAULT_WORKER_CHOICE_STRATEGY_OPTIONS
+ this.opts.workerChoiceStrategyOptions = {
+ ...DEFAULT_WORKER_CHOICE_STRATEGY_OPTIONS,
+ ...opts.workerChoiceStrategyOptions
+ }
this.checkValidWorkerChoiceStrategyOptions(
this.opts.workerChoiceStrategyOptions
)
'Invalid worker choice strategy options: must be a plain object'
)
}
+ if (
+ workerChoiceStrategyOptions.retries != null &&
+ !Number.isSafeInteger(workerChoiceStrategyOptions.retries)
+ ) {
+ throw new TypeError(
+ 'Invalid worker choice strategy options: retries must be an integer'
+ )
+ }
+ if (
+ workerChoiceStrategyOptions.retries != null &&
+ workerChoiceStrategyOptions.retries < 0
+ ) {
+ throw new RangeError(
+ `Invalid worker choice strategy options: retries '${workerChoiceStrategyOptions.retries}' must be greater or equal than zero`
+ )
+ }
if (
workerChoiceStrategyOptions.weights != null &&
Object.keys(workerChoiceStrategyOptions.weights).length !== this.maxSize
'Invalid worker choice strategy options: must have a weight for each worker node'
)
}
+ if (
+ workerChoiceStrategyOptions.measurement != null &&
+ !Object.values(Measurements).includes(
+ workerChoiceStrategyOptions.measurement
+ )
+ ) {
+ throw new Error(
+ `Invalid worker choice strategy options: invalid measurement '${workerChoiceStrategyOptions.measurement}'`
+ )
+ }
}
private checkValidTasksQueueOptions (
if (tasksQueueOptions != null && !isPlainObject(tasksQueueOptions)) {
throw new TypeError('Invalid tasks queue options: must be a plain object')
}
- if ((tasksQueueOptions?.concurrency as number) <= 0) {
+ if (
+ tasksQueueOptions?.concurrency != null &&
+ !Number.isSafeInteger(tasksQueueOptions?.concurrency)
+ ) {
+ throw new TypeError(
+ 'Invalid worker node tasks concurrency: must be an integer'
+ )
+ }
+ if (
+ tasksQueueOptions?.concurrency != null &&
+ tasksQueueOptions?.concurrency <= 0
+ ) {
+ throw new RangeError(
+ `Invalid worker node tasks concurrency: ${tasksQueueOptions?.concurrency} is a negative integer or zero`
+ )
+ }
+ if (tasksQueueOptions?.queueMaxSize != null) {
throw new Error(
- `Invalid worker tasks concurrency '${
- tasksQueueOptions.concurrency as number
- }'`
+ 'Invalid tasks queue options: queueMaxSize is deprecated, please use size instead'
)
}
+ if (
+ tasksQueueOptions?.size != null &&
+ !Number.isSafeInteger(tasksQueueOptions?.size)
+ ) {
+ throw new TypeError(
+ 'Invalid worker node tasks queue size: must be an integer'
+ )
+ }
+ if (tasksQueueOptions?.size != null && tasksQueueOptions?.size <= 0) {
+ throw new RangeError(
+ `Invalid worker node tasks queue size: ${tasksQueueOptions?.size} is a negative integer or zero`
+ )
+ }
+ }
+
+ private startPool (): void {
+ while (
+ this.workerNodes.reduce(
+ (accumulator, workerNode) =>
+ !workerNode.info.dynamic ? accumulator + 1 : accumulator,
+ 0
+ ) < this.numberOfWorkers
+ ) {
+ this.createAndSetupWorkerNode()
+ }
}
/** @inheritDoc */
public get info (): PoolInfo {
return {
+ version,
type: this.type,
worker: this.worker,
+ ready: this.ready,
+ strategy: this.opts.workerChoiceStrategy as WorkerChoiceStrategy,
minSize: this.minSize,
maxSize: this.maxSize,
+ ...(this.workerChoiceStrategyContext.getTaskStatisticsRequirements()
+ .runTime.aggregate &&
+ this.workerChoiceStrategyContext.getTaskStatisticsRequirements()
+ .waitTime.aggregate && { utilization: round(this.utilization) }),
workerNodes: this.workerNodes.length,
idleWorkerNodes: this.workerNodes.reduce(
(accumulator, workerNode) =>
- workerNode.workerUsage.tasks.executing === 0
+ workerNode.usage.tasks.executing === 0
? accumulator + 1
: accumulator,
0
),
busyWorkerNodes: this.workerNodes.reduce(
(accumulator, workerNode) =>
- workerNode.workerUsage.tasks.executing > 0
- ? accumulator + 1
- : accumulator,
+ workerNode.usage.tasks.executing > 0 ? accumulator + 1 : accumulator,
0
),
executedTasks: this.workerNodes.reduce(
(accumulator, workerNode) =>
- accumulator + workerNode.workerUsage.tasks.executed,
+ accumulator + workerNode.usage.tasks.executed,
0
),
executingTasks: this.workerNodes.reduce(
(accumulator, workerNode) =>
- accumulator + workerNode.workerUsage.tasks.executing,
+ accumulator + workerNode.usage.tasks.executing,
0
),
- queuedTasks: this.workerNodes.reduce(
- (accumulator, workerNode) => accumulator + workerNode.tasksQueue.size,
- 0
- ),
- maxQueuedTasks: this.workerNodes.reduce(
+ ...(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.tasksQueue.maxSize,
+ accumulator + workerNode.usage.tasks.failed,
0
),
- failedTasks: this.workerNodes.reduce(
+ ...(this.workerChoiceStrategyContext.getTaskStatisticsRequirements()
+ .runTime.aggregate && {
+ runTime: {
+ minimum: round(
+ min(
+ ...this.workerNodes.map(
+ workerNode => workerNode.usage.runTime?.minimum ?? Infinity
+ )
+ )
+ ),
+ maximum: round(
+ max(
+ ...this.workerNodes.map(
+ workerNode => workerNode.usage.runTime?.maximum ?? -Infinity
+ )
+ )
+ ),
+ ...(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.reduce<number[]>(
+ (accumulator, workerNode) =>
+ accumulator.concat(workerNode.usage.runTime.history),
+ []
+ )
+ )
+ )
+ })
+ }
+ }),
+ ...(this.workerChoiceStrategyContext.getTaskStatisticsRequirements()
+ .waitTime.aggregate && {
+ waitTime: {
+ minimum: round(
+ min(
+ ...this.workerNodes.map(
+ workerNode => workerNode.usage.waitTime?.minimum ?? Infinity
+ )
+ )
+ ),
+ maximum: round(
+ max(
+ ...this.workerNodes.map(
+ workerNode => workerNode.usage.waitTime?.maximum ?? -Infinity
+ )
+ )
+ ),
+ ...(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.reduce<number[]>(
+ (accumulator, workerNode) =>
+ accumulator.concat(workerNode.usage.waitTime.history),
+ []
+ )
+ )
+ )
+ })
+ }
+ })
+ }
+ }
+
+ /**
+ * The pool readiness boolean status.
+ */
+ private get ready (): boolean {
+ return (
+ this.workerNodes.reduce(
(accumulator, workerNode) =>
- accumulator + workerNode.workerUsage.tasks.failed,
+ !workerNode.info.dynamic && workerNode.info.ready
+ ? accumulator + 1
+ : accumulator,
0
- )
- }
+ ) >= this.minSize
+ )
+ }
+
+ /**
+ * The approximate pool utilization.
+ *
+ * @returns The pool utilization.
+ */
+ private get utilization (): number {
+ const poolTimeCapacity =
+ (performance.now() - this.startTimestamp) * this.maxSize
+ const totalTasksRunTime = this.workerNodes.reduce(
+ (accumulator, workerNode) =>
+ accumulator + (workerNode.usage.runTime?.aggregate ?? 0),
+ 0
+ )
+ const totalTasksWaitTime = this.workerNodes.reduce(
+ (accumulator, workerNode) =>
+ 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.
+ * The pool minimum size.
+ */
+ protected get minSize (): number {
+ return this.numberOfWorkers
+ }
+
+ /**
+ * The pool maximum size.
*/
- protected abstract get minSize (): number
+ protected get maxSize (): number {
+ return this.max ?? this.numberOfWorkers
+ }
/**
- * Pool maximum size.
+ * 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.
*/
- protected abstract get maxSize (): number
+ private checkMessageWorkerId (message: MessageValue<Response>): void {
+ if (message.workerId == null) {
+ throw new Error('Worker message received without worker id')
+ } else if (
+ message.workerId != null &&
+ this.getWorkerNodeKeyByWorkerId(message.workerId) === -1
+ ) {
+ throw new Error(
+ `Worker message received from unknown worker '${message.workerId}'`
+ )
+ }
+ }
/**
* Gets the given worker its worker node key.
*
* @param worker - The worker.
- * @returns The worker node key if the worker is found in the pool worker nodes, `-1` otherwise.
+ * @returns The worker node key if found in the pool worker nodes, `-1` otherwise.
*/
- private getWorkerNodeKey (worker: Worker): number {
+ private getWorkerNodeKeyByWorker (worker: Worker): number {
return this.workerNodes.findIndex(
workerNode => workerNode.worker === worker
)
}
+ /**
+ * Gets the worker node key given its worker id.
+ *
+ * @param workerId - The worker id.
+ * @returns The worker node key if the worker id is found in the pool worker nodes, `-1` otherwise.
+ */
+ private getWorkerNodeKeyByWorkerId (workerId: number): number {
+ return this.workerNodes.findIndex(
+ workerNode => workerNode.info.id === workerId
+ )
+ }
+
/** @inheritDoc */
public setWorkerChoiceStrategy (
workerChoiceStrategy: WorkerChoiceStrategy,
if (workerChoiceStrategyOptions != null) {
this.setWorkerChoiceStrategyOptions(workerChoiceStrategyOptions)
}
- for (const workerNode of this.workerNodes) {
- this.setWorkerNodeTasksUsage(
- workerNode,
- this.getWorkerUsage(workerNode.worker)
- )
- this.setWorkerStatistics(workerNode.worker)
+ for (const [workerNodeKey, workerNode] of this.workerNodes.entries()) {
+ workerNode.resetUsage()
+ this.sendStatisticsMessageToWorker(workerNodeKey)
}
}
workerChoiceStrategyOptions: WorkerChoiceStrategyOptions
): void {
this.checkValidWorkerChoiceStrategyOptions(workerChoiceStrategyOptions)
- this.opts.workerChoiceStrategyOptions = workerChoiceStrategyOptions
+ this.opts.workerChoiceStrategyOptions = {
+ ...DEFAULT_WORKER_CHOICE_STRATEGY_OPTIONS,
+ ...workerChoiceStrategyOptions
+ }
this.workerChoiceStrategyContext.setOptions(
this.opts.workerChoiceStrategyOptions
)
this.checkValidTasksQueueOptions(tasksQueueOptions)
this.opts.tasksQueueOptions =
this.buildTasksQueueOptions(tasksQueueOptions)
+ this.setTasksQueueSize(this.opts.tasksQueueOptions.size as number)
} else if (this.opts.tasksQueueOptions != null) {
delete this.opts.tasksQueueOptions
}
}
+ private setTasksQueueSize (size: number): void {
+ for (const workerNode of this.workerNodes) {
+ workerNode.tasksQueueBackPressureSize = size
+ }
+ }
+
private buildTasksQueueOptions (
tasksQueueOptions: TasksQueueOptions
): TasksQueueOptions {
return {
- concurrency: tasksQueueOptions?.concurrency ?? 1
+ ...{
+ size: Math.pow(this.maxSize, 2),
+ concurrency: 1
+ },
+ ...tasksQueueOptions
}
}
*/
protected abstract get busy (): boolean
+ /**
+ * 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 <
+ (this.opts.tasksQueueOptions?.concurrency as number)
+ ) === -1
+ )
+ } else {
+ return (
+ this.workerNodes.findIndex(
+ workerNode =>
+ workerNode.info.ready && workerNode.usage.tasks.executing === 0
+ ) === -1
+ )
+ }
+ }
+
+ private async sendTaskFunctionOperationToWorker (
+ message: Omit<MessageValue<Data>, 'workerId'>
+ ): Promise<boolean> {
+ return await new Promise<boolean>((resolve, reject) => {
+ const responsesReceived = new Array<MessageValue<Data | Response>>()
+ for (const [workerNodeKey] of this.workerNodes.entries()) {
+ this.registerWorkerMessageListener(workerNodeKey, message => {
+ if (message.taskFunctionOperationStatus != null) {
+ responsesReceived.push(message)
+ if (
+ responsesReceived.length === this.workerNodes.length &&
+ responsesReceived.every(
+ message => message.taskFunctionOperationStatus === true
+ )
+ ) {
+ resolve(true)
+ } else if (
+ responsesReceived.length === this.workerNodes.length &&
+ responsesReceived.some(
+ message => message.taskFunctionOperationStatus === false
+ )
+ ) {
+ reject(
+ new Error(
+ `Task function operation ${
+ message.taskFunctionOperation as string
+ } failed on worker ${message.workerId}`
+ )
+ )
+ }
+ }
+ })
+ this.sendToWorker(workerNodeKey, {
+ ...message,
+ workerId: this.getWorkerInfo(workerNodeKey).id as number
+ })
+ }
+ })
+ }
+
+ /** @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
+ }
+
+ /** @inheritDoc */
+ public async addTaskFunction (
+ name: string,
+ taskFunction: TaskFunction
+ ): Promise<boolean> {
+ return await this.sendTaskFunctionOperationToWorker({
+ taskFunctionOperation: 'add',
+ taskFunctionName: name,
+ taskFunction: taskFunction.toString()
+ })
+ }
+
+ /** @inheritDoc */
+ public async removeTaskFunction (name: string): Promise<boolean> {
+ return await this.sendTaskFunctionOperationToWorker({
+ taskFunctionOperation: 'remove',
+ taskFunctionName: name
+ })
+ }
+
+ /** @inheritDoc */
+ public listTaskFunctionNames (): string[] {
+ for (const workerNode of this.workerNodes) {
+ if (
+ Array.isArray(workerNode.info.taskFunctionNames) &&
+ workerNode.info.taskFunctionNames.length > 0
+ ) {
+ return workerNode.info.taskFunctionNames
+ }
+ }
+ return []
+ }
+
+ /** @inheritDoc */
+ public async setDefaultTaskFunction (name: string): Promise<boolean> {
+ return await this.sendTaskFunctionOperationToWorker({
+ taskFunctionOperation: 'default',
+ taskFunctionName: name
+ })
+ }
+
+ private shallExecuteTask (workerNodeKey: number): boolean {
return (
- this.workerNodes.findIndex(workerNode => {
- return workerNode.workerUsage.tasks.executing === 0
- }) === -1
+ this.tasksQueueSize(workerNodeKey) === 0 &&
+ this.workerNodes[workerNodeKey].usage.tasks.executing <
+ (this.opts.tasksQueueOptions?.concurrency as number)
)
}
/** @inheritDoc */
- public async execute (data?: Data, name?: string): Promise<Response> {
- const timestamp = performance.now()
- const workerNodeKey = this.chooseWorkerNode()
- const submittedTask: Task<Data> = {
- name,
- // eslint-disable-next-line @typescript-eslint/consistent-type-assertions
- data: data ?? ({} as Data),
- timestamp,
- id: crypto.randomUUID()
- }
- const res = new Promise<Response>((resolve, reject) => {
- this.promiseResponseMap.set(submittedTask.id as string, {
+ 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 destroyed pool'))
+ return
+ }
+ if (name != null && typeof name !== 'string') {
+ reject(new TypeError('name argument must be a string'))
+ return
+ }
+ if (
+ name != null &&
+ typeof name === 'string' &&
+ name.trim().length === 0
+ ) {
+ 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,
+ workerId: this.getWorkerInfo(workerNodeKey).id as number,
+ taskId: randomUUID()
+ }
+ this.promiseResponseMap.set(task.taskId as string, {
resolve,
reject,
- worker: this.workerNodes[workerNodeKey].worker
+ workerNodeKey
})
+ if (
+ this.opts.enableTasksQueue === false ||
+ (this.opts.enableTasksQueue === true &&
+ this.shallExecuteTask(workerNodeKey))
+ ) {
+ this.executeTask(workerNodeKey, task)
+ } else {
+ this.enqueueTask(workerNodeKey, task)
+ }
})
- if (
- this.opts.enableTasksQueue === true &&
- (this.busy ||
- this.workerNodes[workerNodeKey].workerUsage.tasks.executing >=
- ((this.opts.tasksQueueOptions as TasksQueueOptions)
- .concurrency as number))
- ) {
- this.enqueueTask(workerNodeKey, submittedTask)
- } else {
- this.executeTask(workerNodeKey, submittedTask)
- }
- this.workerChoiceStrategyContext.update(workerNodeKey)
- this.checkAndEmitEvents()
- // eslint-disable-next-line @typescript-eslint/return-await
- return res
}
/** @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
- await this.destroyWorker(workerNode.worker)
+ this.workerNodes.map(async (_, workerNodeKey) => {
+ await this.destroyWorkerNode(workerNodeKey)
})
)
+ this.emitter?.emit(PoolEvents.destroy, this.info)
+ this.started = false
+ }
+
+ protected async sendKillMessageToWorker (
+ workerNodeKey: number,
+ workerId: number
+ ): Promise<void> {
+ await new Promise<void>((resolve, reject) => {
+ this.registerWorkerMessageListener(workerNodeKey, message => {
+ if (message.kill === 'success') {
+ resolve()
+ } else if (message.kill === 'failure') {
+ reject(new Error(`Worker ${workerId} kill message handling failed`))
+ }
+ })
+ this.sendToWorker(workerNodeKey, { kill: true, workerId })
+ })
}
/**
- * Shutdowns the given worker.
+ * Terminates the worker node given its worker node key.
*
- * @param worker - A worker within `workerNodes`.
+ * @param workerNodeKey - The worker node key.
*/
- protected abstract destroyWorker (worker: Worker): void | Promise<void>
+ protected abstract destroyWorkerNode (workerNodeKey: number): Promise<void>
/**
- * Setup hook to execute code before worker node are created in the abstract constructor.
- * Can be overridden
+ * Setup hook to execute code before worker nodes are created in the abstract constructor.
+ * Can be overridden.
*
* @virtual
*/
protected setupHook (): void {
- // Intentionally empty
+ /* Intentionally empty */
}
/**
workerNodeKey: number,
task: Task<Data>
): void {
- const workerUsage = this.workerNodes[workerNodeKey].workerUsage
- ++workerUsage.tasks.executing
- this.updateWaitTimeWorkerUsage(workerUsage, task)
+ if (this.workerNodes[workerNodeKey]?.usage != null) {
+ const workerUsage = this.workerNodes[workerNodeKey].usage
+ ++workerUsage.tasks.executing
+ this.updateWaitTimeWorkerUsage(workerUsage, task)
+ }
+ if (
+ this.shallUpdateTaskFunctionWorkerUsage(workerNodeKey) &&
+ this.workerNodes[workerNodeKey].getTaskFunctionWorkerUsage(
+ task.name as string
+ ) != null
+ ) {
+ const taskFunctionWorkerUsage = this.workerNodes[
+ workerNodeKey
+ ].getTaskFunctionWorkerUsage(task.name as string) as WorkerUsage
+ ++taskFunctionWorkerUsage.tasks.executing
+ this.updateWaitTimeWorkerUsage(taskFunctionWorkerUsage, task)
+ }
}
/**
* Hook executed after the worker task execution.
* Can be overridden.
*
- * @param worker - The worker.
+ * @param workerNodeKey - The worker node key.
* @param message - The received message.
*/
protected afterTaskExecutionHook (
- worker: Worker,
+ workerNodeKey: number,
+ message: MessageValue<Response>
+ ): void {
+ if (this.workerNodes[workerNodeKey]?.usage != null) {
+ const workerUsage = this.workerNodes[workerNodeKey].usage
+ this.updateTaskStatisticsWorkerUsage(workerUsage, message)
+ this.updateRunTimeWorkerUsage(workerUsage, message)
+ this.updateEluWorkerUsage(workerUsage, message)
+ }
+ if (
+ this.shallUpdateTaskFunctionWorkerUsage(workerNodeKey) &&
+ this.workerNodes[workerNodeKey].getTaskFunctionWorkerUsage(
+ message.taskPerformance?.name as string
+ ) != null
+ ) {
+ const taskFunctionWorkerUsage = this.workerNodes[
+ workerNodeKey
+ ].getTaskFunctionWorkerUsage(
+ message.taskPerformance?.name as string
+ ) as WorkerUsage
+ this.updateTaskStatisticsWorkerUsage(taskFunctionWorkerUsage, message)
+ this.updateRunTimeWorkerUsage(taskFunctionWorkerUsage, message)
+ this.updateEluWorkerUsage(taskFunctionWorkerUsage, message)
+ }
+ }
+
+ /**
+ * 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
+ )
+ }
+
+ private updateTaskStatisticsWorkerUsage (
+ workerUsage: WorkerUsage,
message: MessageValue<Response>
): void {
- const workerUsage =
- this.workerNodes[this.getWorkerNodeKey(worker)].workerUsage
const workerTaskStatistics = workerUsage.tasks
- --workerTaskStatistics.executing
- ++workerTaskStatistics.executed
- if (message.taskError != null) {
+ if (
+ workerTaskStatistics.executing != null &&
+ workerTaskStatistics.executing > 0
+ ) {
+ --workerTaskStatistics.executing
+ }
+ if (message.workerError == null) {
+ ++workerTaskStatistics.executed
+ } else {
++workerTaskStatistics.failed
}
- this.updateRunTimeWorkerUsage(workerUsage, message)
- this.updateEluWorkerUsage(workerUsage, message)
}
private updateRunTimeWorkerUsage (
workerUsage: WorkerUsage,
message: MessageValue<Response>
): void {
- if (
- this.workerChoiceStrategyContext.getTaskStatisticsRequirements().runTime
- .aggregate
- ) {
- workerUsage.runTime.aggregate += message.taskPerformance?.runTime ?? 0
- 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)
- }
+ if (message.workerError != null) {
+ return
}
+ updateMeasurementStatistics(
+ workerUsage.runTime,
+ this.workerChoiceStrategyContext.getTaskStatisticsRequirements().runTime,
+ message.taskPerformance?.runTime ?? 0
+ )
}
private updateWaitTimeWorkerUsage (
): void {
const timestamp = performance.now()
const taskWaitTime = timestamp - (task.timestamp ?? timestamp)
- if (
- this.workerChoiceStrategyContext.getTaskStatisticsRequirements().waitTime
- .aggregate
- ) {
- workerUsage.waitTime.aggregate += taskWaitTime ?? 0
- if (
- this.workerChoiceStrategyContext.getTaskStatisticsRequirements()
- .waitTime.average &&
- workerUsage.tasks.executed !== 0
- ) {
- workerUsage.waitTime.average =
- workerUsage.waitTime.aggregate / workerUsage.tasks.executed
- }
- if (
- this.workerChoiceStrategyContext.getTaskStatisticsRequirements()
- .waitTime.median &&
- taskWaitTime != null
- ) {
- workerUsage.waitTime.history.push(taskWaitTime)
- workerUsage.waitTime.median = median(workerUsage.waitTime.history)
- }
- }
+ updateMeasurementStatistics(
+ workerUsage.waitTime,
+ this.workerChoiceStrategyContext.getTaskStatisticsRequirements().waitTime,
+ taskWaitTime
+ )
}
private updateEluWorkerUsage (
workerUsage: WorkerUsage,
message: MessageValue<Response>
): void {
- if (
+ if (message.workerError != null) {
+ return
+ }
+ const eluTaskStatisticsRequirements: MeasurementStatisticsRequirements =
this.workerChoiceStrategyContext.getTaskStatisticsRequirements().elu
- .aggregate
- ) {
- if (workerUsage.elu != null && message.taskPerformance?.elu != null) {
- workerUsage.elu.idle.aggregate += message.taskPerformance.elu.idle
- workerUsage.elu.active.aggregate += message.taskPerformance.elu.active
- workerUsage.elu.utilization =
- (workerUsage.elu.utilization +
- message.taskPerformance.elu.utilization) /
- 2
- } else if (message.taskPerformance?.elu != null) {
- workerUsage.elu.idle.aggregate = message.taskPerformance.elu.idle
- workerUsage.elu.active.aggregate = message.taskPerformance.elu.active
- workerUsage.elu.utilization = message.taskPerformance.elu.utilization
- }
- 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
+ updateMeasurementStatistics(
+ workerUsage.elu.active,
+ eluTaskStatisticsRequirements,
+ message.taskPerformance?.elu?.active ?? 0
+ )
+ updateMeasurementStatistics(
+ workerUsage.elu.idle,
+ eluTaskStatisticsRequirements,
+ message.taskPerformance?.elu?.idle ?? 0
+ )
+ if (eluTaskStatisticsRequirements.aggregate) {
+ if (message.taskPerformance?.elu != null) {
+ if (workerUsage.elu.utilization != null) {
+ workerUsage.elu.utilization =
+ (workerUsage.elu.utilization +
+ message.taskPerformance.elu.utilization) /
+ 2
+ } else {
+ workerUsage.elu.utilization = message.taskPerformance.elu.utilization
+ }
}
+ }
+ }
+
+ /**
+ * Chooses a worker node for the next task.
+ *
+ * The default worker choice strategy uses a round robin algorithm to distribute the tasks.
+ *
+ * @returns The chosen worker node key
+ */
+ private chooseWorkerNode (): number {
+ if (this.shallCreateDynamicWorker()) {
+ const workerNodeKey = this.createAndSetupDynamicWorkerNode()
if (
- this.workerChoiceStrategyContext.getTaskStatisticsRequirements().elu
- .median &&
- message.taskPerformance?.elu != null
+ this.workerChoiceStrategyContext.getStrategyPolicy().dynamicWorkerUsage
) {
- 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)
+ return workerNodeKey
}
}
+ return this.workerChoiceStrategyContext.execute()
}
/**
- * Chooses a worker node for the next task.
+ * Conditions for dynamic worker creation.
*
- * The default worker choice strategy uses a round robin algorithm to distribute the load.
- *
- * @returns The worker node key
- */
- protected chooseWorkerNode (): number {
- let workerNodeKey: number
- if (this.type === PoolTypes.dynamic && !this.full && this.internalBusy()) {
- const workerCreated = this.createAndSetupWorker()
- this.registerWorkerMessageListener(workerCreated, message => {
- const currentWorkerNodeKey = this.getWorkerNodeKey(workerCreated)
- if (
- isKillBehavior(KillBehaviors.HARD, message.kill) ||
- (message.kill != null &&
- this.workerNodes[currentWorkerNodeKey].workerUsage.tasks
- .executing === 0)
- ) {
- // Kill message received from the worker: no new tasks are submitted to that worker for a while ( > maxInactiveTime)
- this.flushTasksQueue(currentWorkerNodeKey)
- // FIXME: wait for tasks to be finished
- void (this.destroyWorker(workerCreated) as Promise<void>)
- }
- })
- workerNodeKey = this.getWorkerNodeKey(workerCreated)
- } else {
- workerNodeKey = this.workerChoiceStrategyContext.execute()
- }
- return workerNodeKey
+ * @returns Whether to create a dynamic worker or not.
+ */
+ private shallCreateDynamicWorker (): boolean {
+ return this.type === PoolTypes.dynamic && !this.full && this.internalBusy()
}
/**
- * 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
/**
- * Registers a listener callback on the given worker.
+ * Creates a new worker.
*
- * @param worker - The worker which should register a listener.
- * @param listener - The message listener callback.
- */
- protected abstract registerWorkerMessageListener<
- Message extends Data | Response
- >(worker: Worker, listener: (message: MessageValue<Message>) => void): void
-
- /**
- * Returns a newly created worker.
+ * @returns Newly created worker.
*/
protected abstract createWorker (): Worker
/**
- * Function that can be hooked up when a worker has been newly created and moved to the pool worker nodes.
+ * Creates a new, completely set up worker node.
*
- * Can be used to update the `maxListeners` or binding the `main-worker`\<-\>`worker` connection if not bind by default.
- *
- * @param worker - The newly created worker.
+ * @returns New, completely set up worker node key.
*/
- protected abstract afterWorkerSetup (worker: Worker): void
-
- /**
- * Creates a new worker and sets it up completely in the pool worker nodes.
- *
- * @returns New, completely set up worker.
- */
- protected createAndSetupWorker (): Worker {
+ protected createAndSetupWorkerNode (): number {
const worker = this.createWorker()
+ worker.on('online', this.opts.onlineHandler ?? EMPTY_FUNCTION)
worker.on('message', this.opts.messageHandler ?? EMPTY_FUNCTION)
worker.on('error', this.opts.errorHandler ?? EMPTY_FUNCTION)
worker.on('error', error => {
- if (this.emitter != null) {
- this.emitter.emit(PoolEvents.error, error)
+ const workerNodeKey = this.getWorkerNodeKeyByWorker(worker)
+ const workerInfo = this.getWorkerInfo(workerNodeKey)
+ workerInfo.ready = false
+ this.workerNodes[workerNodeKey].closeChannel()
+ this.emitter?.emit(PoolEvents.error, error)
+ if (
+ this.opts.restartWorkerOnError === true &&
+ this.started &&
+ !this.starting
+ ) {
+ if (workerInfo.dynamic) {
+ this.createAndSetupDynamicWorkerNode()
+ } else {
+ this.createAndSetupWorkerNode()
+ }
}
- })
- worker.on('error', () => {
- if (this.opts.restartWorkerOnError === true) {
- this.createAndSetupWorker()
+ if (this.opts.enableTasksQueue === true) {
+ this.redistributeQueuedTasks(workerNodeKey)
}
})
- worker.on('online', this.opts.onlineHandler ?? EMPTY_FUNCTION)
worker.on('exit', this.opts.exitHandler ?? EMPTY_FUNCTION)
worker.once('exit', () => {
this.removeWorkerNode(worker)
})
- this.pushWorkerNode(worker)
+ const workerNodeKey = this.addWorkerNode(worker)
+
+ this.afterWorkerNodeSetup(workerNodeKey)
+
+ return workerNodeKey
+ }
+
+ /**
+ * Creates a new, completely set up dynamic worker node.
+ *
+ * @returns New, completely set up dynamic worker node key.
+ */
+ protected createAndSetupDynamicWorkerNode (): number {
+ const workerNodeKey = this.createAndSetupWorkerNode()
+ this.registerWorkerMessageListener(workerNodeKey, message => {
+ const localWorkerNodeKey = this.getWorkerNodeKeyByWorkerId(
+ message.workerId
+ )
+ const workerUsage = this.workerNodes[localWorkerNodeKey].usage
+ // Kill message received from worker
+ if (
+ isKillBehavior(KillBehaviors.HARD, message.kill) ||
+ (isKillBehavior(KillBehaviors.SOFT, message.kill) &&
+ ((this.opts.enableTasksQueue === false &&
+ workerUsage.tasks.executing === 0) ||
+ (this.opts.enableTasksQueue === true &&
+ workerUsage.tasks.executing === 0 &&
+ this.tasksQueueSize(localWorkerNodeKey) === 0)))
+ ) {
+ this.destroyWorkerNode(localWorkerNodeKey).catch(error => {
+ this.emitter?.emit(PoolEvents.error, error)
+ })
+ }
+ })
+ const workerInfo = this.getWorkerInfo(workerNodeKey)
+ this.sendToWorker(workerNodeKey, {
+ checkActive: true,
+ workerId: workerInfo.id as number
+ })
+ workerInfo.dynamic = true
+ if (
+ this.workerChoiceStrategyContext.getStrategyPolicy().dynamicWorkerReady ||
+ this.workerChoiceStrategyContext.getStrategyPolicy().dynamicWorkerUsage
+ ) {
+ workerInfo.ready = true
+ }
+ this.checkAndEmitDynamicWorkerCreationEvents()
+ return workerNodeKey
+ }
+
+ /**
+ * Registers 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 registerWorkerMessageListener<
+ Message extends Data | Response
+ >(
+ workerNodeKey: number,
+ listener: (message: MessageValue<Message>) => void
+ ): void
+
+ /**
+ * Method hooked up after a worker node has been newly created.
+ * Can be overridden.
+ *
+ * @param workerNodeKey - The newly created worker node key.
+ */
+ protected afterWorkerNodeSetup (workerNodeKey: number): void {
+ // Listen to worker messages.
+ this.registerWorkerMessageListener(workerNodeKey, this.workerListener())
+ // Send the startup message to worker.
+ this.sendStartupMessageToWorker(workerNodeKey)
+ // Send the statistics message to worker.
+ this.sendStatisticsMessageToWorker(workerNodeKey)
+ if (this.opts.enableTasksQueue === true) {
+ this.workerNodes[workerNodeKey].onEmptyQueue =
+ this.taskStealingOnEmptyQueue.bind(this)
+ this.workerNodes[workerNodeKey].onBackPressure =
+ this.tasksStealingOnBackPressure.bind(this)
+ }
+ }
+
+ /**
+ * 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,
+ elu: this.workerChoiceStrategyContext.getTaskStatisticsRequirements()
+ .elu.aggregate
+ },
+ workerId: this.getWorkerInfo(workerNodeKey).id as number
+ })
+ }
+
+ private redistributeQueuedTasks (workerNodeKey: number): void {
+ while (this.tasksQueueSize(workerNodeKey) > 0) {
+ 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
+ )
+ const destinationWorkerNode = this.workerNodes[destinationWorkerNodeKey]
+ const task = {
+ ...(this.dequeueTask(workerNodeKey) as Task<Data>),
+ workerId: destinationWorkerNode.info.id as number
+ }
+ if (this.shallExecuteTask(destinationWorkerNodeKey)) {
+ this.executeTask(destinationWorkerNodeKey, task)
+ } else {
+ this.enqueueTask(destinationWorkerNodeKey, task)
+ }
+ }
+ }
- this.setWorkerStatistics(worker)
+ private updateTaskStolenStatisticsWorkerUsage (
+ workerNodeKey: number,
+ taskName: string
+ ): void {
+ const workerNode = this.workerNodes[workerNodeKey]
+ if (workerNode?.usage != null) {
+ ++workerNode.usage.tasks.stolen
+ }
+ if (
+ this.shallUpdateTaskFunctionWorkerUsage(workerNodeKey) &&
+ workerNode.getTaskFunctionWorkerUsage(taskName) != null
+ ) {
+ const taskFunctionWorkerUsage = workerNode.getTaskFunctionWorkerUsage(
+ taskName
+ ) as WorkerUsage
+ ++taskFunctionWorkerUsage.tasks.stolen
+ }
+ }
- this.afterWorkerSetup(worker)
+ private taskStealingOnEmptyQueue (workerId: number): void {
+ const destinationWorkerNodeKey = this.getWorkerNodeKeyByWorkerId(workerId)
+ const destinationWorkerNode = this.workerNodes[destinationWorkerNodeKey]
+ const workerNodes = this.workerNodes
+ .slice()
+ .sort(
+ (workerNodeA, workerNodeB) =>
+ workerNodeB.usage.tasks.queued - workerNodeA.usage.tasks.queued
+ )
+ const sourceWorkerNode = workerNodes.find(
+ workerNode =>
+ workerNode.info.ready &&
+ workerNode.info.id !== workerId &&
+ workerNode.usage.tasks.queued > 0
+ )
+ if (sourceWorkerNode != null) {
+ const task = {
+ ...(sourceWorkerNode.popTask() as Task<Data>),
+ workerId: destinationWorkerNode.info.id as number
+ }
+ if (this.shallExecuteTask(destinationWorkerNodeKey)) {
+ this.executeTask(destinationWorkerNodeKey, task)
+ } else {
+ this.enqueueTask(destinationWorkerNodeKey, task)
+ }
+ this.updateTaskStolenStatisticsWorkerUsage(
+ destinationWorkerNodeKey,
+ task.name as string
+ )
+ }
+ }
- return worker
+ private tasksStealingOnBackPressure (workerId: number): void {
+ const sizeOffset = 1
+ if ((this.opts.tasksQueueOptions?.size as number) <= 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.id !== workerId &&
+ workerNode.usage.tasks.queued <
+ (this.opts.tasksQueueOptions?.size as number) - sizeOffset
+ ) {
+ const task = {
+ ...(sourceWorkerNode.popTask() as Task<Data>),
+ workerId: workerNode.info.id as number
+ }
+ if (this.shallExecuteTask(workerNodeKey)) {
+ this.executeTask(workerNodeKey, task)
+ } else {
+ this.enqueueTask(workerNodeKey, task)
+ }
+ this.updateTaskStolenStatisticsWorkerUsage(
+ workerNodeKey,
+ task.name as string
+ )
+ }
+ }
}
/**
- * This function is the listener registered for each worker message.
+ * This method is the listener registered for each worker message.
*
* @returns The listener function to execute when a message is received from a worker.
*/
protected workerListener (): (message: MessageValue<Response>) => void {
return message => {
- if (message.id != null) {
- // Task execution response received
- const promiseResponse = this.promiseResponseMap.get(message.id)
- if (promiseResponse != null) {
- if (message.taskError != null) {
- promiseResponse.reject(message.taskError.message)
- if (this.emitter != null) {
- this.emitter.emit(PoolEvents.taskError, message.taskError)
- }
- } else {
- promiseResponse.resolve(message.data as Response)
- }
- this.afterTaskExecutionHook(promiseResponse.worker, message)
- this.promiseResponseMap.delete(message.id)
- const workerNodeKey = this.getWorkerNodeKey(promiseResponse.worker)
- if (
- this.opts.enableTasksQueue === true &&
- this.tasksQueueSize(workerNodeKey) > 0
- ) {
- this.executeTask(
- workerNodeKey,
- this.dequeueTask(workerNodeKey) as Task<Data>
- )
- }
- }
+ this.checkMessageWorkerId(message)
+ if (message.ready != null && message.taskFunctionNames != null) {
+ // Worker ready response received from worker
+ this.handleWorkerReadyResponse(message)
+ } else if (message.taskId != null) {
+ // Task execution response received from worker
+ this.handleTaskExecutionResponse(message)
+ } else if (message.taskFunctionNames != null) {
+ // Task function names message received from worker
+ this.getWorkerInfo(
+ this.getWorkerNodeKeyByWorkerId(message.workerId)
+ ).taskFunctionNames = message.taskFunctionNames
+ } else if (message.taskFunctionOperation != null) {
+ // Task function operation response received from worker
}
}
}
- private checkAndEmitEvents (): void {
- if (this.emitter != null) {
- if (this.busy) {
- this.emitter?.emit(PoolEvents.busy, this.info)
+ private handleWorkerReadyResponse (message: MessageValue<Response>): void {
+ if (message.ready === false) {
+ throw new Error(`Worker ${message.workerId} failed to initialize`)
+ }
+ const workerInfo = this.getWorkerInfo(
+ this.getWorkerNodeKeyByWorkerId(message.workerId)
+ )
+ workerInfo.ready = message.ready as boolean
+ workerInfo.taskFunctionNames = message.taskFunctionNames
+ if (this.emitter != null && this.ready) {
+ this.emitter.emit(PoolEvents.ready, this.info)
+ }
+ }
+
+ private handleTaskExecutionResponse (message: MessageValue<Response>): void {
+ const { taskId, workerError, data } = message
+ const promiseResponse = this.promiseResponseMap.get(taskId as string)
+ if (promiseResponse != null) {
+ if (workerError != null) {
+ this.emitter?.emit(PoolEvents.taskError, workerError)
+ promiseResponse.reject(workerError.message)
+ } else {
+ promiseResponse.resolve(data as Response)
+ }
+ const workerNodeKey = promiseResponse.workerNodeKey
+ this.afterTaskExecutionHook(workerNodeKey, message)
+ this.workerChoiceStrategyContext.update(workerNodeKey)
+ this.promiseResponseMap.delete(taskId as string)
+ if (
+ this.opts.enableTasksQueue === true &&
+ this.tasksQueueSize(workerNodeKey) > 0 &&
+ this.workerNodes[workerNodeKey].usage.tasks.executing <
+ (this.opts.tasksQueueOptions?.concurrency as number)
+ ) {
+ this.executeTask(
+ workerNodeKey,
+ this.dequeueTask(workerNodeKey) as Task<Data>
+ )
}
- if (this.type === PoolTypes.dynamic && this.full) {
+ }
+ }
+
+ 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)
+ }
+ }
+
+ private checkAndEmitDynamicWorkerCreationEvents (): void {
+ if (this.type === PoolTypes.dynamic) {
+ if (this.full) {
this.emitter?.emit(PoolEvents.full, this.info)
}
}
}
/**
- * Sets the given worker node its tasks usage in the pool.
+ * Gets the worker information given its worker node key.
*
- * @param workerNode - The worker node.
- * @param workerUsage - The worker usage.
+ * @param workerNodeKey - The worker node key.
+ * @returns The worker information.
*/
- private setWorkerNodeTasksUsage (
- workerNode: WorkerNode<Worker, Data>,
- workerUsage: WorkerUsage
- ): void {
- workerNode.workerUsage = workerUsage
+ protected getWorkerInfo (workerNodeKey: number): WorkerInfo {
+ return this.workerNodes[workerNodeKey].info
}
/**
- * Pushes the given worker in the pool worker nodes.
+ * Adds the given worker in the pool worker nodes.
*
* @param worker - The worker.
- * @returns The worker nodes length.
+ * @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 pushWorkerNode (worker: Worker): number {
- return this.workerNodes.push({
+ private addWorkerNode (worker: Worker): number {
+ const workerNode = new WorkerNode<Worker, Data>(
worker,
- workerUsage: this.getWorkerUsage(worker),
- tasksQueue: new Queue<Task<Data>>()
- })
+ this.opts.tasksQueueOptions?.size ?? Math.pow(this.maxSize, 2)
+ )
+ // Flag the worker node as ready at pool startup.
+ if (this.starting) {
+ workerNode.info.ready = true
+ }
+ this.workerNodes.push(workerNode)
+ const workerNodeKey = this.getWorkerNodeKeyByWorker(worker)
+ if (workerNodeKey === -1) {
+ throw new Error('Worker added not found in worker nodes')
+ }
+ return workerNodeKey
}
- // /**
- // * Sets the given worker in the pool worker nodes.
- // *
- // * @param workerNodeKey - The worker node key.
- // * @param worker - The worker.
- // * @param workerUsage - The worker usage.
- // * @param tasksQueue - The worker task queue.
- // */
- // private setWorkerNode (
- // workerNodeKey: number,
- // worker: Worker,
- // workerUsage: WorkerUsage,
- // tasksQueue: Queue<Task<Data>>
- // ): void {
- // this.workerNodes[workerNodeKey] = {
- // worker,
- // workerUsage,
- // tasksQueue
- // }
- // }
-
/**
* Removes the given worker from the pool worker nodes.
*
* @param worker - The worker.
*/
private removeWorkerNode (worker: Worker): void {
- const workerNodeKey = this.getWorkerNodeKey(worker)
+ const workerNodeKey = this.getWorkerNodeKeyByWorker(worker)
if (workerNodeKey !== -1) {
this.workerNodes.splice(workerNodeKey, 1)
this.workerChoiceStrategyContext.remove(workerNodeKey)
}
}
+ /** @inheritDoc */
+ public hasWorkerNodeBackPressure (workerNodeKey: number): boolean {
+ return (
+ this.opts.enableTasksQueue === true &&
+ this.workerNodes[workerNodeKey].hasBackPressure()
+ )
+ }
+
+ private hasBackPressure (): boolean {
+ return (
+ this.opts.enableTasksQueue === true &&
+ this.workerNodes.findIndex(
+ workerNode => !workerNode.hasBackPressure()
+ ) === -1
+ )
+ }
+
+ /**
+ * Executes the given task on the worker given its worker node key.
+ *
+ * @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].tasksQueue.enqueue(task)
+ const tasksQueueSize = this.workerNodes[workerNodeKey].enqueueTask(task)
+ this.checkAndEmitTaskQueuingEvents()
+ return tasksQueueSize
}
private dequeueTask (workerNodeKey: number): Task<Data> | undefined {
- return this.workerNodes[workerNodeKey].tasksQueue.dequeue()
+ return this.workerNodes[workerNodeKey].dequeueTask()
}
private tasksQueueSize (workerNodeKey: number): number {
- return this.workerNodes[workerNodeKey].tasksQueue.size
+ return this.workerNodes[workerNodeKey].tasksQueueSize()
}
- private flushTasksQueue (workerNodeKey: number): void {
- if (this.tasksQueueSize(workerNodeKey) > 0) {
- for (let i = 0; i < this.tasksQueueSize(workerNodeKey); i++) {
- this.executeTask(
- workerNodeKey,
- this.dequeueTask(workerNodeKey) as Task<Data>
- )
- }
+ protected flushTasksQueue (workerNodeKey: number): void {
+ while (this.tasksQueueSize(workerNodeKey) > 0) {
+ this.executeTask(
+ workerNodeKey,
+ this.dequeueTask(workerNodeKey) as Task<Data>
+ )
}
+ this.workerNodes[workerNodeKey].clearTasksQueue()
}
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
- }
- })
- }
-
- private getWorkerUsage (worker: Worker): WorkerUsage {
- return {
- tasks: this.getTaskStatistics(worker),
- runTime: {
- aggregate: 0,
- average: 0,
- median: 0,
- history: new CircularArray()
- },
- waitTime: {
- aggregate: 0,
- average: 0,
- median: 0,
- history: new CircularArray()
- },
- elu: {
- idle: {
- aggregate: 0,
- average: 0,
- median: 0,
- history: new CircularArray()
- },
- active: {
- aggregate: 0,
- average: 0,
- median: 0,
- history: new CircularArray()
- },
- utilization: 0
- }
- }
- }
-
- private getTaskStatistics (worker: Worker): TaskStatistics {
- const queueSize =
- this.workerNodes[this.getWorkerNodeKey(worker)]?.tasksQueue?.size
- return {
- executed: 0,
- executing: 0,
- get queued (): number {
- return queueSize ?? 0
- },
- failed: 0
- }
- }
}