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 {
+ MessageValue,
+ PromiseResponseWrapper,
+ Task
+} from '../utility-types'
import {
DEFAULT_TASK_NAME,
DEFAULT_WORKER_CHOICE_STRATEGY_OPTIONS,
isKillBehavior,
isPlainObject,
median,
- round
+ round,
+ updateMeasurementStatistics
} from '../utils'
import { KillBehaviors } from '../worker/worker-options'
import {
import type {
IWorker,
IWorkerNode,
- MessageHandler,
- Task,
WorkerInfo,
WorkerType,
WorkerUsage
} from './worker'
import {
+ type MeasurementStatisticsRequirements,
Measurements,
WorkerChoiceStrategies,
type WorkerChoiceStrategy,
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
>
+ /**
+ * Whether the pool is starting or not.
+ */
+ private readonly starting: boolean
/**
* The start timestamp of the pool.
*/
this.chooseWorkerNode = this.chooseWorkerNode.bind(this)
this.executeTask = this.executeTask.bind(this)
this.enqueueTask = this.enqueueTask.bind(this)
+ this.dequeueTask = this.dequeueTask.bind(this)
this.checkAndEmitEvents = this.checkAndEmitEvents.bind(this)
if (this.opts.enableEvents === true) {
this.setupHook()
- while (this.workerNodes.length < this.numberOfWorkers) {
- this.createAndSetupWorker()
- }
+ this.starting = true
+ this.startPool()
+ this.starting = false
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 {
protected checkDynamicPoolSize (min: number, max: number): void {
if (this.type === PoolTypes.dynamic) {
- if (min > max) {
+ if (max == null) {
+ throw new Error(
+ '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 (min === 0 && max === 0) {
+ } else if (max === 0) {
throw new RangeError(
- 'Cannot instantiate a dynamic pool with a minimum pool size and a maximum pool size equal to zero'
+ 'Cannot instantiate a dynamic pool with a maximum pool size equal to zero'
)
} else if (min === max) {
throw new RangeError(
}
}
+ 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 {
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
+ )
+ }),
failedTasks: this.workerNodes.reduce(
(accumulator, workerNode) =>
accumulator + workerNode.usage.tasks.failed,
}
}
- private get starting (): boolean {
- return (
- this.workerNodes.length < this.minSize ||
- (this.workerNodes.length >= this.minSize &&
- this.workerNodes.some(workerNode => !workerNode.info.ready))
- )
- }
-
+ /**
+ * The pool readiness boolean status.
+ */
private get ready (): boolean {
return (
- this.workerNodes.length >= this.minSize &&
- this.workerNodes.every(workerNode => workerNode.info.ready)
+ this.workerNodes.reduce(
+ (accumulator, workerNode) =>
+ !workerNode.info.dynamic && workerNode.info.ready
+ ? accumulator + 1
+ : accumulator,
+ 0
+ ) >= this.minSize
)
}
/**
- * Gets the approximate pool utilization.
+ * The approximate pool utilization.
*
* @returns The pool utilization.
*/
private get utilization (): number {
- const poolRunTimeCapacity =
+ const poolTimeCapacity =
(performance.now() - this.startTimestamp) * this.maxSize
const totalTasksRunTime = this.workerNodes.reduce(
(accumulator, workerNode) =>
accumulator + (workerNode.usage.waitTime?.aggregate ?? 0),
0
)
- return (totalTasksRunTime + totalTasksWaitTime) / poolRunTimeCapacity
+ 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 abstract get minSize (): number
/**
- * Pool maximum size.
+ * The pool maximum size.
*/
protected abstract get maxSize (): number
/**
- * Get the worker given its id.
+ * Checks if the worker id sent in the received message from a worker is valid.
*
- * @param workerId - The worker id.
- * @returns The worker if found in the pool worker nodes, `undefined` otherwise.
+ * @param message - The received message.
+ * @throws {@link https://nodejs.org/api/errors.html#class-error} If the worker id is invalid.
*/
- private getWorkerById (workerId: number): Worker | undefined {
- return this.workerNodes.find(workerNode => workerNode.info.id === workerId)
- ?.worker
- }
-
private checkMessageWorkerId (message: MessageValue<Response>): void {
if (
message.workerId != null &&
- this.getWorkerById(message.workerId) == null
+ this.getWorkerNodeKeyByWorkerId(message.workerId) === -1
) {
throw new Error(
`Worker message received from unknown worker '${message.workerId}'`
* @param worker - The worker.
* @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) {
+ for (const [workerNodeKey, workerNode] of this.workerNodes.entries()) {
workerNode.resetUsage()
- this.setWorkerStatistics(workerNode.worker)
+ this.sendWorkerStatisticsMessageToWorker(workerNodeKey)
}
}
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 {
- return (
- this.workerNodes.findIndex(workerNode => {
- return workerNode.usage.tasks.executing === 0
- }) === -1
- )
+ 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
+ )
+ }
}
/** @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, {
+ return await new Promise<Response>((resolve, reject) => {
+ 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),
+ 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.workerNodes[workerNodeKey].usage.tasks.executing <
+ (this.opts.tasksQueueOptions?.concurrency as number))
+ ) {
+ this.executeTask(workerNodeKey, task)
+ } else {
+ this.enqueueTask(workerNodeKey, task)
+ }
+ this.checkAndEmitEvents()
})
- if (
- this.opts.enableTasksQueue === true &&
- (this.busy ||
- this.workerNodes[workerNodeKey].usage.tasks.executing >=
- ((this.opts.tasksQueueOptions as TasksQueueOptions)
- .concurrency as number))
- ) {
- this.enqueueTask(workerNodeKey, submittedTask)
- } else {
- this.executeTask(workerNodeKey, submittedTask)
- }
- 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
- const workerExitPromise = new Promise<void>(resolve => {
- workerNode.worker.on('exit', () => {
- resolve()
- })
- })
- await this.destroyWorker(workerNode.worker)
- await workerExitPromise
+ this.workerNodes.map(async (_, workerNodeKey) => {
+ await this.destroyWorkerNode(workerNodeKey)
})
)
}
/**
- * Terminates 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 nodes are created in the abstract constructor.
const workerUsage = this.workerNodes[workerNodeKey].usage
++workerUsage.tasks.executing
this.updateWaitTimeWorkerUsage(workerUsage, task)
- const tasksWorkerUsage = this.workerNodes[workerNodeKey].getTaskWorkerUsage(
+ const taskWorkerUsage = this.workerNodes[workerNodeKey].getTaskWorkerUsage(
task.name as string
) as WorkerUsage
- ++tasksWorkerUsage.tasks.executing
- this.updateWaitTimeWorkerUsage(tasksWorkerUsage, task)
+ ++taskWorkerUsage.tasks.executing
+ this.updateWaitTimeWorkerUsage(taskWorkerUsage, 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 {
- const workerNodeKey = this.getWorkerNodeKey(worker)
const workerUsage = this.workerNodes[workerNodeKey].usage
this.updateTaskStatisticsWorkerUsage(workerUsage, message)
this.updateRunTimeWorkerUsage(workerUsage, message)
this.updateEluWorkerUsage(workerUsage, message)
- const tasksWorkerUsage = this.workerNodes[workerNodeKey].getTaskWorkerUsage(
- message.name as string
+ const taskWorkerUsage = this.workerNodes[workerNodeKey].getTaskWorkerUsage(
+ message.taskPerformance?.name ?? DEFAULT_TASK_NAME
) as WorkerUsage
- this.updateTaskStatisticsWorkerUsage(tasksWorkerUsage, message)
- this.updateRunTimeWorkerUsage(tasksWorkerUsage, message)
- this.updateEluWorkerUsage(tasksWorkerUsage, message)
+ this.updateTaskStatisticsWorkerUsage(taskWorkerUsage, message)
+ this.updateRunTimeWorkerUsage(taskWorkerUsage, message)
+ this.updateEluWorkerUsage(taskWorkerUsage, message)
}
private updateTaskStatisticsWorkerUsage (
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
- )
- 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)
- }
- }
+ updateMeasurementStatistics(
+ workerUsage.runTime,
+ this.workerChoiceStrategyContext.getTaskStatisticsRequirements().runTime,
+ message.taskPerformance?.runTime ?? 0,
+ workerUsage.tasks.executed
+ )
}
private updateWaitTimeWorkerUsage (
): 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
- )
- 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
- ) {
- workerUsage.waitTime.history.push(taskWaitTime)
- workerUsage.waitTime.median = median(workerUsage.waitTime.history)
- }
- }
+ updateMeasurementStatistics(
+ workerUsage.waitTime,
+ this.workerChoiceStrategyContext.getTaskStatisticsRequirements().waitTime,
+ taskWaitTime,
+ workerUsage.tasks.executed
+ )
}
private updateEluWorkerUsage (
workerUsage: WorkerUsage,
message: MessageValue<Response>
): void {
- if (
+ const eluTaskStatisticsRequirements: MeasurementStatisticsRequirements =
this.workerChoiceStrategyContext.getTaskStatisticsRequirements().elu
- .aggregate
- ) {
+ updateMeasurementStatistics(
+ workerUsage.elu.active,
+ eluTaskStatisticsRequirements,
+ message.taskPerformance?.elu?.active ?? 0,
+ workerUsage.tasks.executed
+ )
+ updateMeasurementStatistics(
+ workerUsage.elu.idle,
+ eluTaskStatisticsRequirements,
+ message.taskPerformance?.elu?.idle ?? 0,
+ workerUsage.tasks.executed
+ )
+ if (eluTaskStatisticsRequirements.aggregate) {
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 +
} 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)
- }
}
}
}
*
* 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
) {
- return this.getWorkerNodeKey(worker)
+ return workerNodeKey
}
}
return this.workerChoiceStrategyContext.execute()
}
/**
- * 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.
*/
protected abstract sendToWorker (
- worker: Worker,
+ workerNodeKey: number,
message: MessageValue<Data>
): void
- /**
- * Registers a listener callback on the given worker.
- *
- * @param worker - The worker which should register a listener.
- * @param listener - The message listener callback.
- */
- private registerWorkerMessageListener<Message extends Data | Response>(
- worker: Worker,
- listener: (message: MessageValue<Message>) => void
- ): void {
- worker.on('message', listener as MessageHandler<Worker>)
- }
-
/**
* Creates a new 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.
- * Can be overridden.
+ * Creates a new, completely set up worker node.
*
- * @param worker - The newly created worker.
+ * @returns New, completely set up worker node key.
*/
- protected afterWorkerSetup (worker: Worker): void {
- // Listen to worker messages.
- this.registerWorkerMessageListener(worker, this.workerListener())
- // Send startup message to worker.
- this.sendToWorker(worker, {
- ready: false,
- workerId: this.getWorkerInfo(this.getWorkerNodeKey(worker)).id as number
- })
- // Setup worker task statistics computation.
- this.setWorkerStatistics(worker)
- }
-
- /**
- * 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('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)
- }
- if (this.opts.enableTasksQueue === true) {
- this.redistributeQueuedTasks(worker)
- }
+ 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.starting) {
- if (this.getWorkerInfo(this.getWorkerNodeKey(worker)).dynamic) {
- this.createAndSetupDynamicWorker()
+ if (workerInfo.dynamic) {
+ this.createAndSetupDynamicWorkerNode()
} else {
- this.createAndSetupWorker()
+ this.createAndSetupWorkerNode()
}
}
+ if (this.opts.enableTasksQueue === true) {
+ this.redistributeQueuedTasks(workerNodeKey)
+ }
})
worker.on('online', this.opts.onlineHandler ?? EMPTY_FUNCTION)
worker.on('exit', this.opts.exitHandler ?? EMPTY_FUNCTION)
this.removeWorkerNode(worker)
})
- this.pushWorkerNode(worker)
+ const workerNodeKey = this.addWorkerNode(worker)
- this.afterWorkerSetup(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) ||
+ (message.kill != null &&
+ ((this.opts.enableTasksQueue === false &&
+ workerUsage.tasks.executing === 0) ||
+ (this.opts.enableTasksQueue === true &&
+ workerUsage.tasks.executing === 0 &&
+ this.tasksQueueSize(localWorkerNodeKey) === 0)))
+ ) {
+ this.destroyWorkerNode(localWorkerNodeKey).catch(EMPTY_FUNCTION)
+ }
+ })
+ const workerInfo = this.getWorkerInfo(workerNodeKey)
+ this.sendToWorker(workerNodeKey, {
+ checkActive: true,
+ workerId: workerInfo.id as number
+ })
+ workerInfo.dynamic = true
+ if (this.workerChoiceStrategyContext.getStrategyPolicy().useDynamicWorker) {
+ workerInfo.ready = true
+ }
+ 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 worker statistics message to worker.
+ this.sendWorkerStatisticsMessageToWorker(workerNodeKey)
+ }
+
+ /**
+ * Sends the startup message to worker given its worker node key.
+ *
+ * @param workerNodeKey - The worker node key.
+ */
+ protected abstract sendStartupMessageToWorker (workerNodeKey: number): void
- return worker
+ /**
+ * Sends the worker statistics message to worker given its worker node key.
+ *
+ * @param workerNodeKey - The worker node key.
+ */
+ private sendWorkerStatisticsMessageToWorker (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 (worker: Worker): void {
- const workerNodeKey = this.getWorkerNodeKey(worker)
+ private redistributeQueuedTasks (workerNodeKey: number): void {
while (this.tasksQueueSize(workerNodeKey) > 0) {
let targetWorkerNodeKey: number = workerNodeKey
let minQueuedTasks = Infinity
+ let executeTask = false
for (const [workerNodeId, workerNode] of this.workerNodes.entries()) {
+ const workerInfo = this.getWorkerInfo(workerNodeId)
if (
workerNodeId !== workerNodeKey &&
+ workerInfo.ready &&
workerNode.usage.tasks.queued === 0
) {
+ if (
+ this.workerNodes[workerNodeId].usage.tasks.executing <
+ (this.opts.tasksQueueOptions?.concurrency as number)
+ ) {
+ executeTask = true
+ }
targetWorkerNodeKey = workerNodeId
break
}
if (
workerNodeId !== workerNodeKey &&
+ workerInfo.ready &&
workerNode.usage.tasks.queued < minQueuedTasks
) {
minQueuedTasks = workerNode.usage.tasks.queued
targetWorkerNodeKey = workerNodeId
}
}
- this.enqueueTask(
- targetWorkerNodeKey,
- this.dequeueTask(workerNodeKey) as Task<Data>
- )
- }
- }
-
- /**
- * Creates a new dynamic worker and sets it up completely in the pool worker nodes.
- *
- * @returns New, completely set up dynamic worker.
- */
- protected createAndSetupDynamicWorker (): Worker {
- const worker = this.createAndSetupWorker()
- this.registerWorkerMessageListener(worker, message => {
- const workerNodeKey = this.getWorkerNodeKey(worker)
- if (
- isKillBehavior(KillBehaviors.HARD, message.kill) ||
- (message.kill != null &&
- ((this.opts.enableTasksQueue === false &&
- this.workerNodes[workerNodeKey].usage.tasks.executing === 0) ||
- (this.opts.enableTasksQueue === true &&
- this.workerNodes[workerNodeKey].usage.tasks.executing === 0 &&
- this.tasksQueueSize(workerNodeKey) === 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>)
+ if (executeTask) {
+ this.executeTask(
+ targetWorkerNodeKey,
+ this.dequeueTask(workerNodeKey) as Task<Data>
+ )
+ } else {
+ this.enqueueTask(
+ targetWorkerNodeKey,
+ this.dequeueTask(workerNodeKey) as Task<Data>
+ )
}
- })
- const workerInfo = this.getWorkerInfo(this.getWorkerNodeKey(worker))
- workerInfo.dynamic = true
- this.sendToWorker(worker, {
- checkAlive: true,
- workerId: workerInfo.id as number
- })
- return worker
+ }
}
/**
- * 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 => {
this.checkMessageWorkerId(message)
- if (message.ready != null && message.workerId != null) {
- // Worker ready message received
- this.handleWorkerReadyMessage(message)
- } else if (message.id != null) {
- // Task execution response received
+ if (message.ready != null) {
+ // Worker ready response received from worker
+ this.handleWorkerReadyResponse(message)
+ } else if (message.taskId != null) {
+ // Task execution response received from worker
this.handleTaskExecutionResponse(message)
}
}
}
- private handleWorkerReadyMessage (message: MessageValue<Response>): void {
- const worker = this.getWorkerById(message.workerId)
- this.getWorkerInfo(this.getWorkerNodeKey(worker as Worker)).ready =
- message.ready as boolean
+ private handleWorkerReadyResponse (message: MessageValue<Response>): void {
+ this.getWorkerInfo(
+ this.getWorkerNodeKeyByWorkerId(message.workerId)
+ ).ready = message.ready as boolean
if (this.emitter != null && this.ready) {
this.emitter.emit(PoolEvents.ready, this.info)
}
}
private handleTaskExecutionResponse (message: MessageValue<Response>): void {
- const promiseResponse = this.promiseResponseMap.get(message.id as string)
+ const promiseResponse = this.promiseResponseMap.get(
+ message.taskId as string
+ )
if (promiseResponse != null) {
if (message.taskError != null) {
- if (this.emitter != null) {
- this.emitter.emit(PoolEvents.taskError, message.taskError)
- }
+ this.emitter?.emit(PoolEvents.taskError, message.taskError)
promiseResponse.reject(message.taskError.message)
} else {
promiseResponse.resolve(message.data as Response)
}
- this.afterTaskExecutionHook(promiseResponse.worker, message)
- this.promiseResponseMap.delete(message.id as string)
- const workerNodeKey = this.getWorkerNodeKey(promiseResponse.worker)
+ const workerNodeKey = promiseResponse.workerNodeKey
+ this.afterTaskExecutionHook(workerNodeKey, message)
+ this.promiseResponseMap.delete(message.taskId as string)
if (
this.opts.enableTasksQueue === true &&
- this.tasksQueueSize(workerNodeKey) > 0
+ this.tasksQueueSize(workerNodeKey) > 0 &&
+ this.workerNodes[workerNodeKey].usage.tasks.executing <
+ (this.opts.tasksQueueOptions?.concurrency as number)
) {
this.executeTask(
workerNodeKey,
}
/**
- * 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 {
+ 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(new WorkerNode(worker, this.worker))
+ private addWorkerNode (worker: Worker): number {
+ const workerNode = new WorkerNode<Worker, Data>(worker, this.worker)
+ // 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 node not found')
+ }
+ return workerNodeKey
}
/**
* @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)
}
}
+ /**
+ * 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)
}
private enqueueTask (workerNodeKey: number, task: Task<Data>): number {
return this.workerNodes[workerNodeKey].tasksQueueSize()
}
- private flushTasksQueue (workerNodeKey: number): void {
+ protected flushTasksQueue (workerNodeKey: number): void {
while (this.tasksQueueSize(workerNodeKey) > 0) {
this.executeTask(
workerNodeKey,
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