+import crypto from 'node:crypto'
import type {
MessageValue,
PromiseWorkerResponseWrapper
} from '../utility-types'
import { EMPTY_FUNCTION } from '../utils'
-import { isKillBehavior, KillBehaviors } from '../worker/worker-options'
-import type { AbstractPoolWorker } from './abstract-pool-worker'
+import { KillBehaviors, isKillBehavior } from '../worker/worker-options'
import type { PoolOptions } from './pool'
-import type { IPoolInternal } from './pool-internal'
-import { PoolEmitter, PoolType } from './pool-internal'
+import { PoolEmitter } from './pool'
+import type { IPoolInternal, TasksUsage, WorkerType } from './pool-internal'
+import { PoolType } from './pool-internal'
+import type { IPoolWorker } from './pool-worker'
import {
WorkerChoiceStrategies,
- WorkerChoiceStrategy
+ type WorkerChoiceStrategy
} from './selection-strategies/selection-strategies-types'
import { WorkerChoiceStrategyContext } from './selection-strategies/worker-choice-strategy-context'
/**
- * Base class containing some shared logic for all poolifier pools.
+ * Base class that implements some shared logic for all poolifier pools.
*
- * @template Worker Type of worker which manages this pool.
- * @template Data Type of data sent to the worker. This can only be serializable data.
- * @template Response Type of response of execution. This can only be serializable data.
+ * @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.
*/
export abstract class AbstractPool<
- Worker extends AbstractPoolWorker,
+ Worker extends IPoolWorker,
Data = unknown,
Response = unknown
> implements IPoolInternal<Worker, Data, Response> {
- /** @inheritDoc */
- public readonly workers: Worker[] = []
+ /** {@inheritDoc} */
+ public readonly workers: Map<number, WorkerType<Worker>> = new Map<
+ number,
+ WorkerType<Worker>
+ >()
- /** @inheritDoc */
- public readonly tasks: Map<Worker, number> = new Map<Worker, number>()
-
- /** @inheritDoc */
+ /** {@inheritDoc} */
public readonly emitter?: PoolEmitter
- /** @inheritDoc */
- public readonly max?: number
+ /**
+ * Id of the next worker.
+ */
+ protected nextWorkerId: number = 0
/**
* The promise map.
*
- * - `key`: This is the message Id of each submitted task.
+ * - `key`: This is the message id of each submitted task.
* - `value`: An object that contains the worker, the resolve function and the reject function.
*
* When we receive a message from the worker we get a map entry and resolve/reject the promise based on the message.
*/
protected promiseMap: Map<
- number,
- PromiseWorkerResponseWrapper<Worker, Response>
- > = new Map<number, PromiseWorkerResponseWrapper<Worker, Response>>()
-
- /**
- * Id of the next message.
- */
- protected nextMessageId: number = 0
+ string,
+ PromiseWorkerResponseWrapper<Worker, Response>
+ > = new Map<string, PromiseWorkerResponseWrapper<Worker, Response>>()
/**
* Worker choice strategy instance implementing the worker choice algorithm.
* Default to a strategy implementing a round robin algorithm.
*/
protected workerChoiceStrategyContext: WorkerChoiceStrategyContext<
- Worker,
- Data,
- Response
+ Worker,
+ Data,
+ Response
>
/**
* Constructs a new poolifier pool.
*
- * @param numberOfWorkers Number of workers that this pool should manage.
- * @param filePath Path to the worker-file.
- * @param opts Options for the pool.
+ * @param numberOfWorkers - Number of workers that this pool should manage.
+ * @param filePath - Path to the worker-file.
+ * @param opts - Options for the pool.
*/
public constructor (
public readonly numberOfWorkers: number,
this.createAndSetupWorker()
}
- if (this.opts.enableEvents) {
+ if (this.opts.enableEvents === true) {
this.emitter = new PoolEmitter()
}
this.workerChoiceStrategyContext = new WorkerChoiceStrategyContext(
this.registerWorkerMessageListener(workerCreated, message => {
if (
isKillBehavior(KillBehaviors.HARD, message.kill) ||
- this.getWorkerRunningTasks(workerCreated) === 0
+ this.getWorkerTasksUsage(workerCreated)?.running === 0
) {
// Kill received from the worker, means that no new tasks are submitted to that worker for a while ( > maxInactiveTime)
- this.destroyWorker(workerCreated) as void
+ void this.destroyWorker(workerCreated)
}
})
return workerCreated
}
private checkFilePath (filePath: string): void {
- if (!filePath) {
+ if (
+ filePath == null ||
+ (typeof filePath === 'string' && filePath.trim().length === 0)
+ ) {
throw new Error('Please specify a file with a worker implementation')
}
}
'Cannot instantiate a pool without specifying the number of workers'
)
} else if (!Number.isSafeInteger(numberOfWorkers)) {
- throw new Error(
+ throw new TypeError(
'Cannot instantiate a pool with a non integer number of workers'
)
} else if (numberOfWorkers < 0) {
- throw new Error(
+ throw new RangeError(
'Cannot instantiate a pool with a negative number of workers'
)
} else if (this.type === PoolType.FIXED && numberOfWorkers === 0) {
this.opts.enableEvents = opts.enableEvents ?? true
}
- /** @inheritDoc */
+ /** {@inheritDoc} */
public abstract get type (): PoolType
- /** @inheritDoc */
+ /** {@inheritDoc} */
public get numberOfRunningTasks (): number {
return this.promiseMap.size
}
- /** @inheritDoc */
- public getWorkerRunningTasks (worker: Worker): number | undefined {
- return this.tasks.get(worker)
- }
-
- /** @inheritDoc */
- public getWorkerIndex (worker: Worker): number {
- return this.workers.indexOf(worker)
+ /**
+ * Gets the given worker key.
+ *
+ * @param worker - The worker.
+ * @returns The worker key.
+ */
+ private getWorkerKey (worker: Worker): number | undefined {
+ return [...this.workers].find(([, value]) => value.worker === worker)?.[0]
}
- /** @inheritDoc */
+ /** {@inheritDoc} */
public setWorkerChoiceStrategy (
workerChoiceStrategy: WorkerChoiceStrategy
): void {
this.opts.workerChoiceStrategy = workerChoiceStrategy
+ for (const [key, value] of this.workers) {
+ this.setWorker(key, value.worker, {
+ run: 0,
+ running: 0,
+ runTime: 0,
+ avgRunTime: 0
+ })
+ }
this.workerChoiceStrategyContext.setWorkerChoiceStrategy(
workerChoiceStrategy
)
}
- /** @inheritDoc */
+ /** {@inheritDoc} */
public abstract get busy (): boolean
protected internalGetBusyStatus (): boolean {
)
}
- /** @inheritDoc */
+ /** {@inheritDoc} */
public findFreeWorker (): Worker | false {
- for (const worker of this.workers) {
- if (this.getWorkerRunningTasks(worker) === 0) {
+ for (const value of this.workers.values()) {
+ if (value.tasksUsage.running === 0) {
// A worker is free, return the matching worker
- return worker
+ return value.worker
}
}
return false
}
- /** @inheritDoc */
- public execute (data: Data): Promise<Response> {
- // Configure worker to handle message with the specified task
+ /** {@inheritDoc} */
+ public async execute (data: Data): Promise<Response> {
const worker = this.chooseWorker()
- const messageId = ++this.nextMessageId
+ const messageId = crypto.randomUUID()
const res = this.internalExecute(worker, messageId)
this.checkAndEmitBusy()
- data = data ?? ({} as Data)
- this.sendToWorker(worker, { data, id: messageId })
+ this.sendToWorker(worker, {
+ // eslint-disable-next-line @typescript-eslint/consistent-type-assertions
+ data: data ?? ({} as Data),
+ id: messageId
+ })
+ // eslint-disable-next-line @typescript-eslint/return-await
return res
}
- /** @inheritDoc */
+ /** {@inheritDoc} */
public async destroy (): Promise<void> {
- await Promise.all(this.workers.map(worker => this.destroyWorker(worker)))
+ await Promise.all(
+ [...this.workers].map(async ([, value]) => {
+ await this.destroyWorker(value.worker)
+ })
+ )
}
/**
- * Shut down given worker.
+ * Shutdowns given worker.
*
- * @param worker A worker within `workers`.
+ * @param worker - A worker within `workers`.
*/
protected abstract destroyWorker (worker: Worker): void | Promise<void>
protected abstract isMain (): boolean
/**
- * Increase the number of tasks that the given worker has applied.
- *
- * @param worker Worker whose tasks are increased.
- */
- protected increaseWorkersTask (worker: Worker): void {
- this.stepWorkerNumberOfTasks(worker, 1)
- }
-
- /**
- * Decrease the number of tasks that the given worker has applied.
+ * Hook executed before the worker task promise resolution.
+ * Can be overridden.
*
- * @param worker Worker whose tasks are decreased.
+ * @param worker - The worker.
*/
- protected decreaseWorkersTasks (worker: Worker): void {
- this.stepWorkerNumberOfTasks(worker, -1)
+ protected beforePromiseWorkerResponseHook (worker: Worker): void {
+ ++(this.getWorkerTasksUsage(worker) as TasksUsage).running
}
/**
- * Step the number of tasks that the given worker has applied.
+ * Hook executed after the worker task promise resolution.
+ * Can be overridden.
*
- * @param worker Worker whose tasks are set.
- * @param step Worker number of tasks step.
+ * @param message - The received message.
+ * @param promise - The Promise response.
*/
- private stepWorkerNumberOfTasks (worker: Worker, step: number): void {
- const numberOfTasksInProgress = this.tasks.get(worker)
- if (numberOfTasksInProgress !== undefined) {
- this.tasks.set(worker, numberOfTasksInProgress + step)
- } else {
- throw Error('Worker could not be found in tasks map')
+ protected afterPromiseWorkerResponseHook (
+ message: MessageValue<Response>,
+ promise: PromiseWorkerResponseWrapper<Worker, Response>
+ ): void {
+ const workerTasksUsage = this.getWorkerTasksUsage(
+ promise.worker
+ ) as TasksUsage
+ --workerTasksUsage.running
+ ++workerTasksUsage.run
+ if (
+ this.workerChoiceStrategyContext.getWorkerChoiceStrategy()
+ .requiredStatistics.runTime
+ ) {
+ workerTasksUsage.runTime += message.taskRunTime ?? 0
+ if (workerTasksUsage.run !== 0) {
+ workerTasksUsage.avgRunTime =
+ workerTasksUsage.runTime / workerTasksUsage.run
+ }
}
}
/**
* Removes the given worker from the pool.
*
- * @param worker Worker that will be removed.
+ * @param worker - The worker that will be removed.
*/
protected removeWorker (worker: Worker): void {
- // Clean worker from data structure
- this.workers.splice(this.getWorkerIndex(worker), 1)
- this.tasks.delete(worker)
+ this.workers.delete(this.getWorkerKey(worker) as number)
+ --this.nextWorkerId
}
/**
- * Choose a worker for the next task.
+ * Chooses a worker for the next task.
*
* The default implementation uses a round robin algorithm to distribute the load.
*
}
/**
- * Send a message to the given worker.
+ * Sends a message to the given worker.
*
- * @param worker The worker which should receive the message.
- * @param message The message.
+ * @param worker - The worker which should receive the message.
+ * @param message - The message.
*/
protected abstract sendToWorker (
worker: Worker,
): void
/**
- * Register a listener callback on a given worker.
+ * Registers a listener callback on a given worker.
*
- * @param worker A worker.
- * @param listener A message listener callback.
+ * @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
-
- protected internalExecute (
- worker: Worker,
- messageId: number
- ): Promise<Response> {
- this.increaseWorkersTask(worker)
- return new Promise<Response>((resolve, reject) => {
- this.promiseMap.set(messageId, { resolve, reject, worker })
- })
- }
+ >(worker: Worker, listener: (message: MessageValue<Message>) => void): void
/**
* Returns a newly created worker.
/**
* Function that can be hooked up when a worker has been newly created and moved to the workers registry.
*
- * Can be used to update the `maxListeners` or binding the `main-worker`<->`worker` connection if not bind by default.
+ * 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.
+ * @param worker - The newly created worker.
*/
protected abstract afterWorkerSetup (worker: Worker): void
worker.on('error', this.opts.errorHandler ?? EMPTY_FUNCTION)
worker.on('online', this.opts.onlineHandler ?? EMPTY_FUNCTION)
worker.on('exit', this.opts.exitHandler ?? EMPTY_FUNCTION)
- worker.once('exit', () => this.removeWorker(worker))
-
- this.workers.push(worker)
+ worker.once('exit', () => {
+ this.removeWorker(worker)
+ })
- // Init tasks map
- this.tasks.set(worker, 0)
+ this.setWorker(this.nextWorkerId, worker, {
+ run: 0,
+ running: 0,
+ runTime: 0,
+ avgRunTime: 0
+ })
+ ++this.nextWorkerId
this.afterWorkerSetup(worker)
if (message.id !== undefined) {
const promise = this.promiseMap.get(message.id)
if (promise !== undefined) {
- this.decreaseWorkersTasks(promise.worker)
- if (message.error) promise.reject(message.error)
- else promise.resolve(message.data as Response)
+ if (message.error != null) {
+ promise.reject(message.error)
+ } else {
+ promise.resolve(message.data as Response)
+ }
+ this.afterPromiseWorkerResponseHook(message, promise)
this.promiseMap.delete(message.id)
}
}
}
}
+ private async internalExecute (
+ worker: Worker,
+ messageId: string
+ ): Promise<Response> {
+ this.beforePromiseWorkerResponseHook(worker)
+ return await new Promise<Response>((resolve, reject) => {
+ this.promiseMap.set(messageId, { resolve, reject, worker })
+ })
+ }
+
private checkAndEmitBusy (): void {
- if (this.opts.enableEvents && this.busy) {
+ if (this.opts.enableEvents === true && this.busy) {
this.emitter?.emit('busy')
}
}
+
+ /** {@inheritDoc} */
+ public getWorkerTasksUsage (worker: Worker): TasksUsage | undefined {
+ const workerKey = this.getWorkerKey(worker)
+ if (workerKey !== undefined) {
+ return (this.workers.get(workerKey) as WorkerType<Worker>).tasksUsage
+ }
+ throw new Error('Worker could not be found in the pool')
+ }
+
+ /**
+ * Sets the given worker.
+ *
+ * @param workerKey - The worker key.
+ * @param worker - The worker.
+ * @param tasksUsage - The worker tasks usage.
+ */
+ private setWorker (
+ workerKey: number,
+ worker: Worker,
+ tasksUsage: TasksUsage
+ ): void {
+ this.workers.set(workerKey, {
+ worker,
+ tasksUsage
+ })
+ }
}
repositories / poolifier.git / blobdiff