import crypto from 'node:crypto'
+import { performance } from 'node:perf_hooks'
import type { MessageValue, PromiseResponseWrapper } from '../utility-types'
-import { EMPTY_FUNCTION } from '../utils'
+import {
+ DEFAULT_WORKER_CHOICE_STRATEGY_OPTIONS,
+ EMPTY_FUNCTION,
+ isPlainObject,
+ median
+} from '../utils'
import { KillBehaviors, isKillBehavior } from '../worker/worker-options'
-import type { PoolOptions } from './pool'
-import { PoolEmitter } from './pool'
-import type { IPoolInternal, TasksUsage, WorkerType } from './pool-internal'
-import { PoolType } from './pool-internal'
-import type { IPoolWorker } from './pool-worker'
+import { CircularArray } from '../circular-array'
+import { Queue } from '../queue'
+import {
+ type IPool,
+ PoolEmitter,
+ PoolEvents,
+ type PoolInfo,
+ type PoolOptions,
+ type PoolType,
+ PoolTypes,
+ type TasksQueueOptions,
+ type WorkerType
+} from './pool'
+import type { IWorker, Task, WorkerNode, WorkerUsage } from './worker'
import {
WorkerChoiceStrategies,
- type WorkerChoiceStrategy
+ type WorkerChoiceStrategy,
+ type WorkerChoiceStrategyOptions
} from './selection-strategies/selection-strategies-types'
import { WorkerChoiceStrategyContext } from './selection-strategies/worker-choice-strategy-context'
*
* @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 response of execution. This can only be serializable data.
+ * @typeParam Response - Type of execution response. This can only be serializable data.
*/
export abstract class AbstractPool<
- Worker extends IPoolWorker,
+ Worker extends IWorker,
Data = unknown,
Response = unknown
-> implements IPoolInternal<Worker, Data, Response> {
+> implements IPool<Worker, Data, Response> {
/** @inheritDoc */
- public readonly workers: Array<WorkerType<Worker>> = []
+ public readonly workerNodes: Array<WorkerNode<Worker, Data>> = []
/** @inheritDoc */
public readonly emitter?: PoolEmitter
/**
- * The promise response map.
+ * The execution response promise map.
*
* - `key`: The message id of each submitted task.
- * - `value`: An object that contains the worker, the promise resolve and reject callbacks.
+ * - `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.
+ * 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,
* Constructs a new poolifier pool.
*
* @param numberOfWorkers - Number of workers that this pool should manage.
- * @param filePath - Path to the worker-file.
+ * @param filePath - Path to the worker file.
* @param opts - Options for the pool.
*/
public constructor (
- public readonly numberOfWorkers: number,
- public readonly filePath: string,
- public readonly opts: PoolOptions<Worker>
+ protected readonly numberOfWorkers: number,
+ protected readonly filePath: string,
+ protected readonly opts: PoolOptions<Worker>
) {
if (!this.isMain()) {
throw new Error('Cannot start a pool from a worker!')
this.checkFilePath(this.filePath)
this.checkPoolOptions(this.opts)
- this.chooseWorker.bind(this)
- this.internalExecute.bind(this)
- this.checkAndEmitFull.bind(this)
- this.checkAndEmitBusy.bind(this)
- this.sendToWorker.bind(this)
-
- this.setupHook()
-
- for (let i = 1; i <= this.numberOfWorkers; i++) {
- this.createAndSetupWorker()
- }
+ 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()
Worker,
Data,
Response
- >(this, this.opts.workerChoiceStrategy)
+ >(
+ this,
+ this.opts.workerChoiceStrategy,
+ this.opts.workerChoiceStrategyOptions
+ )
+
+ this.setupHook()
+
+ for (let i = 1; i <= this.numberOfWorkers; i++) {
+ this.createAndSetupWorker()
+ }
}
private checkFilePath (filePath: string): void {
)
} else if (!Number.isSafeInteger(numberOfWorkers)) {
throw new TypeError(
- 'Cannot instantiate a pool with a non integer number of workers'
+ 'Cannot instantiate a pool with a non safe integer number of workers'
)
} else if (numberOfWorkers < 0) {
throw new RangeError(
'Cannot instantiate a pool with a negative number of workers'
)
- } else if (this.type === PoolType.FIXED && numberOfWorkers === 0) {
+ } else if (this.type === PoolTypes.fixed && numberOfWorkers === 0) {
throw new Error('Cannot instantiate a fixed pool with no worker')
}
}
private checkPoolOptions (opts: PoolOptions<Worker>): void {
- this.opts.workerChoiceStrategy =
- opts.workerChoiceStrategy ?? WorkerChoiceStrategies.ROUND_ROBIN
- if (
- !Object.values(WorkerChoiceStrategies).includes(
- this.opts.workerChoiceStrategy
+ if (isPlainObject(opts)) {
+ 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
+ )
+ 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
+ )
+ this.opts.tasksQueueOptions = this.buildTasksQueueOptions(
+ opts.tasksQueueOptions as TasksQueueOptions
+ )
+ }
+ } else {
+ throw new TypeError('Invalid pool options: must be a plain object')
+ }
+ }
+
+ private checkValidWorkerChoiceStrategy (
+ workerChoiceStrategy: WorkerChoiceStrategy
+ ): void {
+ if (!Object.values(WorkerChoiceStrategies).includes(workerChoiceStrategy)) {
+ throw new Error(
+ `Invalid worker choice strategy '${workerChoiceStrategy}'`
)
+ }
+ }
+
+ private checkValidWorkerChoiceStrategyOptions (
+ workerChoiceStrategyOptions: WorkerChoiceStrategyOptions
+ ): void {
+ if (!isPlainObject(workerChoiceStrategyOptions)) {
+ throw new TypeError(
+ 'Invalid worker choice strategy options: must be a plain object'
+ )
+ }
+ if (
+ workerChoiceStrategyOptions.weights != null &&
+ Object.keys(workerChoiceStrategyOptions.weights).length !== this.maxSize
) {
throw new Error(
- `Invalid worker choice strategy '${this.opts.workerChoiceStrategy}'`
+ 'Invalid worker choice strategy options: must have a weight for each worker node'
+ )
+ }
+ }
+
+ 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 as number) <= 0) {
+ throw new Error(
+ `Invalid worker tasks concurrency '${
+ tasksQueueOptions.concurrency as number
+ }'`
)
}
- this.opts.enableEvents = opts.enableEvents ?? true
}
/** @inheritDoc */
- public abstract get type (): PoolType
+ public get info (): PoolInfo {
+ return {
+ type: this.type,
+ worker: this.worker,
+ minSize: this.minSize,
+ maxSize: this.maxSize,
+ workerNodes: this.workerNodes.length,
+ idleWorkerNodes: this.workerNodes.reduce(
+ (accumulator, workerNode) =>
+ workerNode.workerUsage.tasks.executing === 0
+ ? accumulator + 1
+ : accumulator,
+ 0
+ ),
+ busyWorkerNodes: this.workerNodes.reduce(
+ (accumulator, workerNode) =>
+ workerNode.workerUsage.tasks.executing > 0
+ ? accumulator + 1
+ : accumulator,
+ 0
+ ),
+ executedTasks: this.workerNodes.reduce(
+ (accumulator, workerNode) =>
+ accumulator + workerNode.workerUsage.tasks.executed,
+ 0
+ ),
+ executingTasks: this.workerNodes.reduce(
+ (accumulator, workerNode) =>
+ accumulator + workerNode.workerUsage.tasks.executing,
+ 0
+ ),
+ queuedTasks: this.workerNodes.reduce(
+ (accumulator, workerNode) => accumulator + workerNode.tasksQueue.size,
+ 0
+ ),
+ maxQueuedTasks: this.workerNodes.reduce(
+ (accumulator, workerNode) =>
+ accumulator + workerNode.tasksQueue.maxSize,
+ 0
+ ),
+ failedTasks: this.workerNodes.reduce(
+ (accumulator, workerNode) =>
+ accumulator + workerNode.workerUsage.tasks.failed,
+ 0
+ )
+ }
+ }
/**
- * Number of tasks concurrently running in the pool.
+ * Pool type.
+ *
+ * If it is `'dynamic'`, it provides the `max` property.
*/
- private get numberOfRunningTasks (): number {
- return this.promiseResponseMap.size
- }
+ protected abstract get type (): PoolType
+
+ /**
+ * Gets the worker type.
+ */
+ protected abstract get worker (): WorkerType
/**
- * Gets the given worker key.
+ * Pool minimum size.
+ */
+ protected abstract get minSize (): number
+
+ /**
+ * Pool maximum size.
+ */
+ protected abstract get maxSize (): number
+
+ /**
+ * Gets the given worker its worker node key.
*
* @param worker - The worker.
- * @returns The worker key if the worker is found in the pool, `-1` otherwise.
+ * @returns The worker node key if the worker is found in the pool worker nodes, `-1` otherwise.
*/
- private getWorkerKey (worker: Worker): number {
- return this.workers.findIndex(workerItem => workerItem.worker === worker)
+ private getWorkerNodeKey (worker: Worker): number {
+ return this.workerNodes.findIndex(
+ workerNode => workerNode.worker === worker
+ )
}
/** @inheritDoc */
public setWorkerChoiceStrategy (
- workerChoiceStrategy: WorkerChoiceStrategy
+ workerChoiceStrategy: WorkerChoiceStrategy,
+ workerChoiceStrategyOptions?: WorkerChoiceStrategyOptions
): void {
+ this.checkValidWorkerChoiceStrategy(workerChoiceStrategy)
this.opts.workerChoiceStrategy = workerChoiceStrategy
- for (const [index, workerItem] of this.workers.entries()) {
- this.setWorker(index, workerItem.worker, {
- run: 0,
- running: 0,
- runTime: 0,
- avgRunTime: 0,
- error: 0
+ this.workerChoiceStrategyContext.setWorkerChoiceStrategy(
+ this.opts.workerChoiceStrategy
+ )
+ if (workerChoiceStrategyOptions != null) {
+ this.setWorkerChoiceStrategyOptions(workerChoiceStrategyOptions)
+ }
+ for (const workerNode of this.workerNodes) {
+ this.setWorkerNodeTasksUsage(workerNode, {
+ tasks: {
+ executed: 0,
+ executing: 0,
+ queued:
+ this.opts.enableTasksQueue === true
+ ? workerNode.tasksQueue.size
+ : 0,
+ failed: 0
+ },
+ runTime: {
+ aggregation: 0,
+ average: 0,
+ median: 0,
+ history: new CircularArray()
+ },
+ waitTime: {
+ aggregation: 0,
+ average: 0,
+ median: 0,
+ history: new CircularArray()
+ },
+ elu: undefined
})
+ this.setWorkerStatistics(workerNode.worker)
}
- this.workerChoiceStrategyContext.setWorkerChoiceStrategy(
- workerChoiceStrategy
+ }
+
+ /** @inheritDoc */
+ public setWorkerChoiceStrategyOptions (
+ workerChoiceStrategyOptions: WorkerChoiceStrategyOptions
+ ): void {
+ this.checkValidWorkerChoiceStrategyOptions(workerChoiceStrategyOptions)
+ this.opts.workerChoiceStrategyOptions = workerChoiceStrategyOptions
+ this.workerChoiceStrategyContext.setOptions(
+ this.opts.workerChoiceStrategyOptions
)
}
/** @inheritDoc */
- public abstract get full (): boolean
+ public enableTasksQueue (
+ enable: boolean,
+ tasksQueueOptions?: TasksQueueOptions
+ ): void {
+ if (this.opts.enableTasksQueue === true && !enable) {
+ this.flushTasksQueues()
+ }
+ this.opts.enableTasksQueue = enable
+ this.setTasksQueueOptions(tasksQueueOptions as TasksQueueOptions)
+ }
/** @inheritDoc */
- public abstract get busy (): boolean
+ public setTasksQueueOptions (tasksQueueOptions: TasksQueueOptions): void {
+ if (this.opts.enableTasksQueue === true) {
+ this.checkValidTasksQueueOptions(tasksQueueOptions)
+ this.opts.tasksQueueOptions =
+ this.buildTasksQueueOptions(tasksQueueOptions)
+ } else if (this.opts.tasksQueueOptions != null) {
+ delete this.opts.tasksQueueOptions
+ }
+ }
+
+ private buildTasksQueueOptions (
+ tasksQueueOptions: TasksQueueOptions
+ ): TasksQueueOptions {
+ return {
+ concurrency: tasksQueueOptions?.concurrency ?? 1
+ }
+ }
+
+ /**
+ * Whether the pool is full or not.
+ *
+ * The pool filling boolean status.
+ */
+ protected get full (): boolean {
+ return this.workerNodes.length >= this.maxSize
+ }
+
+ /**
+ * Whether the pool is busy or not.
+ *
+ * The pool busyness boolean status.
+ */
+ protected abstract get busy (): boolean
protected internalBusy (): boolean {
return (
- this.numberOfRunningTasks >= this.numberOfWorkers &&
- this.findFreeWorkerKey() === -1
+ this.workerNodes.findIndex(workerNode => {
+ return workerNode.workerUsage.tasks.executing === 0
+ }) === -1
)
}
/** @inheritDoc */
- public findFreeWorkerKey (): number {
- return this.workers.findIndex(workerItem => {
- return workerItem.tasksUsage.running === 0
- })
- }
-
- /** @inheritDoc */
- public async execute (data: Data): Promise<Response> {
- const [workerKey, worker] = this.chooseWorker()
- const messageId = crypto.randomUUID()
- const res = this.internalExecute(workerKey, worker, messageId)
- this.checkAndEmitFull()
- this.checkAndEmitBusy()
- this.sendToWorker(worker, {
+ 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),
- id: messageId
+ timestamp,
+ id: crypto.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 ||
+ 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.workers.map(async workerItem => {
- await this.destroyWorker(workerItem.worker)
+ this.workerNodes.map(async (workerNode, workerNodeKey) => {
+ this.flushTasksQueue(workerNodeKey)
+ // FIXME: wait for tasks to be finished
+ await this.destroyWorker(workerNode.worker)
})
)
}
/**
- * Shutdowns given worker in the pool.
+ * Shutdowns the given worker.
*
- * @param worker - A worker within `workers`.
+ * @param worker - A worker within `workerNodes`.
*/
protected abstract destroyWorker (worker: Worker): void | Promise<void>
/**
- * Setup hook that can be overridden by a Poolifier pool implementation
- * to run code before workers are created in the abstract constructor.
+ * Setup hook to execute code before worker node are created in the abstract constructor.
* Can be overridden
*
* @virtual
protected abstract isMain (): boolean
/**
- * Hook executed before the worker task promise resolution.
+ * Hook executed before the worker task execution.
* Can be overridden.
*
- * @param workerKey - The worker key.
+ * @param workerNodeKey - The worker node key.
*/
- protected beforePromiseResponseHook (workerKey: number): void {
- ++this.workers[workerKey].tasksUsage.running
+ protected beforeTaskExecutionHook (workerNodeKey: number): void {
+ ++this.workerNodes[workerNodeKey].workerUsage.tasks.executing
+ if (this.opts.enableTasksQueue === true) {
+ this.workerNodes[workerNodeKey].workerUsage.tasks.queued =
+ this.tasksQueueSize(workerNodeKey)
+ }
}
/**
- * Hook executed after the worker task promise resolution.
+ * Hook executed after the worker task execution.
* Can be overridden.
*
* @param worker - The worker.
* @param message - The received message.
*/
- protected afterPromiseResponseHook (
+ protected afterTaskExecutionHook (
worker: Worker,
message: MessageValue<Response>
): void {
- const workerTasksUsage = this.getWorkerTasksUsage(worker) as TasksUsage
- --workerTasksUsage.running
- ++workerTasksUsage.run
- if (message.error != null) {
- ++workerTasksUsage.error
+ const workerUsage =
+ this.workerNodes[this.getWorkerNodeKey(worker)].workerUsage
+ const workerTaskStatistics = workerUsage.tasks
+ --workerTaskStatistics.executing
+ ++workerTaskStatistics.executed
+ if (message.taskError != null) {
+ ++workerTaskStatistics.failed
+ }
+
+ this.updateRunTimeWorkerUsage(workerUsage, message)
+ this.updateWaitTimeWorkerUsage(workerUsage, message)
+ this.updateEluWorkerUsage(workerUsage, message)
+ }
+
+ private updateRunTimeWorkerUsage (
+ workerUsage: WorkerUsage,
+ message: MessageValue<Response>
+ ): void {
+ if (this.workerChoiceStrategyContext.getTaskStatistics().runTime) {
+ workerUsage.runTime.aggregation += message.taskPerformance?.runTime ?? 0
+ if (
+ this.workerChoiceStrategyContext.getTaskStatistics().avgRunTime &&
+ workerUsage.tasks.executed !== 0
+ ) {
+ workerUsage.runTime.average =
+ workerUsage.runTime.aggregation / workerUsage.tasks.executed
+ }
+ if (
+ this.workerChoiceStrategyContext.getTaskStatistics().medRunTime &&
+ message.taskPerformance?.runTime != null
+ ) {
+ workerUsage.runTime.history.push(message.taskPerformance.runTime)
+ workerUsage.runTime.median = median(workerUsage.runTime.history)
+ }
+ }
+ }
+
+ private updateWaitTimeWorkerUsage (
+ workerUsage: WorkerUsage,
+ message: MessageValue<Response>
+ ): void {
+ if (this.workerChoiceStrategyContext.getTaskStatistics().waitTime) {
+ workerUsage.waitTime.aggregation += message.taskPerformance?.waitTime ?? 0
+ if (
+ this.workerChoiceStrategyContext.getTaskStatistics().avgWaitTime &&
+ workerUsage.tasks.executed !== 0
+ ) {
+ workerUsage.waitTime.average =
+ workerUsage.waitTime.aggregation / workerUsage.tasks.executed
+ }
+ if (
+ this.workerChoiceStrategyContext.getTaskStatistics().medWaitTime &&
+ message.taskPerformance?.waitTime != null
+ ) {
+ workerUsage.waitTime.history.push(message.taskPerformance.waitTime)
+ workerUsage.waitTime.median = median(workerUsage.waitTime.history)
+ }
}
- if (this.workerChoiceStrategyContext.getRequiredStatistics().runTime) {
- workerTasksUsage.runTime += message.taskRunTime ?? 0
+ }
+
+ private updateEluWorkerUsage (
+ workerTasksUsage: WorkerUsage,
+ message: MessageValue<Response>
+ ): void {
+ if (this.workerChoiceStrategyContext.getTaskStatistics().elu) {
if (
- this.workerChoiceStrategyContext.getRequiredStatistics().avgRunTime &&
- workerTasksUsage.run !== 0
+ workerTasksUsage.elu != null &&
+ message.taskPerformance?.elu != null
) {
- workerTasksUsage.avgRunTime =
- workerTasksUsage.runTime / workerTasksUsage.run
+ workerTasksUsage.elu = {
+ idle: workerTasksUsage.elu.idle + message.taskPerformance.elu.idle,
+ active:
+ workerTasksUsage.elu.active + message.taskPerformance.elu.active,
+ utilization:
+ (workerTasksUsage.elu.utilization +
+ message.taskPerformance.elu.utilization) /
+ 2
+ }
+ } else if (message.taskPerformance?.elu != null) {
+ workerTasksUsage.elu = message.taskPerformance.elu
}
}
}
/**
- * Chooses a worker for the next task.
+ * Chooses a worker node for the next task.
*
- * The default uses a round robin algorithm to distribute the load.
+ * The default worker choice strategy uses a round robin algorithm to distribute the load.
*
- * @returns [worker key, worker].
+ * @returns The worker node key
*/
- protected chooseWorker (): [number, Worker] {
- let workerKey: number
- if (
- this.type === PoolType.DYNAMIC &&
- !this.full &&
- this.findFreeWorkerKey() === -1
- ) {
- const createdWorker = this.createAndSetupWorker()
- this.registerWorkerMessageListener(createdWorker, message => {
+ 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.getWorkerTasksUsage(createdWorker)?.running === 0)
+ this.workerNodes[currentWorkerNodeKey].workerUsage.tasks
+ .executing === 0)
) {
- // Kill received from the worker, means that no new tasks are submitted to that worker for a while ( > maxInactiveTime)
- void this.destroyWorker(createdWorker)
+ // 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>)
}
})
- workerKey = this.getWorkerKey(createdWorker)
+ workerNodeKey = this.getWorkerNodeKey(workerCreated)
} else {
- workerKey = this.workerChoiceStrategyContext.execute()
+ workerNodeKey = this.workerChoiceStrategyContext.execute()
}
- return [workerKey, this.workers[workerKey].worker]
+ return workerNodeKey
}
/**
): void
/**
- * Registers a listener callback on a given worker.
+ * Registers a listener callback on the given worker.
*
* @param worker - The worker which should register a listener.
* @param listener - The message listener callback.
protected abstract createWorker (): Worker
/**
- * Function that can be hooked up when a worker has been newly created and moved to the workers registry.
+ * Function that can be hooked up when a worker has been newly created and moved to the pool worker nodes.
*
* 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.
- * @virtual
*/
protected abstract afterWorkerSetup (worker: Worker): void
/**
- * Creates a new worker for this pool and sets it up completely.
+ * Creates a new worker and sets it up completely in the pool worker nodes.
*
* @returns New, completely set up worker.
*/
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)
+ }
+ })
+ worker.on('error', () => {
+ if (this.opts.restartWorkerOnError === true) {
+ this.createAndSetupWorker()
+ }
+ })
worker.on('online', this.opts.onlineHandler ?? EMPTY_FUNCTION)
worker.on('exit', this.opts.exitHandler ?? EMPTY_FUNCTION)
worker.once('exit', () => {
- this.removeWorker(worker)
+ this.removeWorkerNode(worker)
})
- this.pushWorker(worker, {
- run: 0,
- running: 0,
- runTime: 0,
- avgRunTime: 0,
- error: 0
- })
+ this.pushWorkerNode(worker)
+
+ this.setWorkerStatistics(worker)
this.afterWorkerSetup(worker)
}
/**
- * This function is the listener registered for each worker.
+ * This function 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.error != null) {
- promiseResponse.reject(message.error)
+ 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.afterPromiseResponseHook(promiseResponse.worker, message)
+ 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>
+ )
+ }
}
}
}
}
- private async internalExecute (
- workerKey: number,
- worker: Worker,
- messageId: string
- ): Promise<Response> {
- this.beforePromiseResponseHook(workerKey)
- return await new Promise<Response>((resolve, reject) => {
- this.promiseResponseMap.set(messageId, { resolve, reject, worker })
- })
- }
-
- private checkAndEmitBusy (): void {
- if (this.opts.enableEvents === true && this.busy) {
- this.emitter?.emit('busy')
- }
- }
-
- private checkAndEmitFull (): void {
- if (
- this.type === PoolType.DYNAMIC &&
- this.opts.enableEvents === true &&
- this.full
- ) {
- this.emitter?.emit('full')
+ 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)
+ }
}
}
/**
- * Gets the given worker tasks usage in the pool.
+ * Sets the given worker node its tasks usage in the pool.
*
- * @param worker - The worker.
- * @returns The worker tasks usage.
+ * @param workerNode - The worker node.
+ * @param workerUsage - The worker usage.
*/
- private getWorkerTasksUsage (worker: Worker): TasksUsage | undefined {
- const workerKey = this.getWorkerKey(worker)
- if (workerKey !== -1) {
- return this.workers[workerKey].tasksUsage
- }
- throw new Error('Worker could not be found in the pool')
+ private setWorkerNodeTasksUsage (
+ workerNode: WorkerNode<Worker, Data>,
+ workerUsage: WorkerUsage
+ ): void {
+ workerNode.workerUsage = workerUsage
}
/**
- * Pushes the given worker in the pool.
+ * Pushes the given worker in the pool worker nodes.
*
* @param worker - The worker.
- * @param tasksUsage - The worker tasks usage.
+ * @returns The worker nodes length.
*/
- private pushWorker (worker: Worker, tasksUsage: TasksUsage): void {
- this.workers.push({
+ private pushWorkerNode (worker: Worker): number {
+ return this.workerNodes.push({
worker,
- tasksUsage
+ workerUsage: {
+ tasks: {
+ executed: 0,
+ executing: 0,
+ queued: 0,
+ failed: 0
+ },
+ runTime: {
+ aggregation: 0,
+ average: 0,
+ median: 0,
+ history: new CircularArray()
+ },
+
+ waitTime: {
+ aggregation: 0,
+ average: 0,
+ median: 0,
+ history: new CircularArray()
+ },
+ elu: undefined
+ },
+ tasksQueue: new Queue<Task<Data>>()
})
}
/**
- * Sets the given worker in the pool.
+ * Sets the given worker in the pool worker nodes.
*
- * @param workerKey - The worker key.
+ * @param workerNodeKey - The worker node key.
* @param worker - The worker.
- * @param tasksUsage - The worker tasks usage.
+ * @param workerUsage - The worker usage.
+ * @param tasksQueue - The worker task queue.
*/
- private setWorker (
- workerKey: number,
+ private setWorkerNode (
+ workerNodeKey: number,
worker: Worker,
- tasksUsage: TasksUsage
+ workerUsage: WorkerUsage,
+ tasksQueue: Queue<Task<Data>>
): void {
- this.workers[workerKey] = {
+ this.workerNodes[workerNodeKey] = {
worker,
- tasksUsage
+ workerUsage,
+ tasksQueue
}
}
/**
- * Removes the given worker from the pool.
+ * Removes the given worker from the pool worker nodes.
*
- * @param worker - The worker that will be removed.
+ * @param worker - The worker.
*/
- protected removeWorker (worker: Worker): void {
- const workerKey = this.getWorkerKey(worker)
- this.workers.splice(workerKey, 1)
- this.workerChoiceStrategyContext.remove(workerKey)
+ private removeWorkerNode (worker: Worker): void {
+ const workerNodeKey = this.getWorkerNodeKey(worker)
+ if (workerNodeKey !== -1) {
+ this.workerNodes.splice(workerNodeKey, 1)
+ this.workerChoiceStrategyContext.remove(workerNodeKey)
+ }
+ }
+
+ private executeTask (workerNodeKey: number, task: Task<Data>): void {
+ this.beforeTaskExecutionHook(workerNodeKey)
+ this.sendToWorker(this.workerNodes[workerNodeKey].worker, task)
+ }
+
+ private enqueueTask (workerNodeKey: number, task: Task<Data>): number {
+ return this.workerNodes[workerNodeKey].tasksQueue.enqueue(task)
+ }
+
+ private dequeueTask (workerNodeKey: number): Task<Data> | undefined {
+ return this.workerNodes[workerNodeKey].tasksQueue.dequeue()
+ }
+
+ private tasksQueueSize (workerNodeKey: number): number {
+ return this.workerNodes[workerNodeKey].tasksQueue.size
+ }
+
+ 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>
+ )
+ }
+ }
+ }
+
+ private flushTasksQueues (): void {
+ for (const [workerNodeKey] of this.workerNodes.entries()) {
+ this.flushTasksQueue(workerNodeKey)
+ }
+ }
+
+ private setWorkerStatistics (worker: Worker): void {
+ this.sendToWorker(worker, {
+ statistics: {
+ runTime: this.workerChoiceStrategyContext.getTaskStatistics().runTime,
+ waitTime: this.workerChoiceStrategyContext.getTaskStatistics().waitTime,
+ elu: this.workerChoiceStrategyContext.getTaskStatistics().elu
+ }
+ })
}
}