import {
- MessageChannel,
- SHARE_ENV,
- Worker,
- isMainThread
+ isMainThread,
+ type TransferListItem,
+ type Worker,
} from 'node:worker_threads'
-import type { Draft, MessageValue } from '../../utility-types'
-import { AbstractPool } from '../abstract-pool'
-import {
- type PoolOptions,
- type PoolType,
- PoolTypes,
- type WorkerType,
- WorkerTypes
-} from '../pool'
+
+import type { MessageValue } from '../../utility-types.js'
+import { AbstractPool } from '../abstract-pool.js'
+import { type PoolOptions, type PoolType, PoolTypes } from '../pool.js'
+import { type WorkerType, WorkerTypes } from '../worker.js'
/**
- * A thread worker with message channels for communication between main thread and thread worker.
+ * Options for a poolifier thread pool.
*/
-export type ThreadWorkerWithMessageChannel = Worker & Draft<MessageChannel>
+export type ThreadPoolOptions = PoolOptions<Worker>
/**
* A thread pool with a fixed number of threads.
- *
- * It is possible to perform tasks in sync or asynchronous mode as you prefer.
- *
- * This pool selects the threads in a round robin fashion.
- *
- * @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.
* @author [Alessandro Pio Ardizio](https://github.com/pioardi)
* @since 0.0.1
*/
export class FixedThreadPool<
Data = unknown,
Response = unknown
-> extends AbstractPool<ThreadWorkerWithMessageChannel, Data, Response> {
+> extends AbstractPool<Worker, Data, Response> {
/**
* Constructs a new poolifier fixed thread pool.
- *
* @param numberOfThreads - Number of threads for this pool.
* @param filePath - Path to an implementation of a `ThreadWorker` file, which can be relative or absolute.
* @param opts - Options for this fixed thread pool.
+ * @param maximumNumberOfThreads - The maximum number of threads for this pool.
*/
public constructor (
numberOfThreads: number,
filePath: string,
- opts: PoolOptions<ThreadWorkerWithMessageChannel> = {}
+ opts: ThreadPoolOptions = {},
+ maximumNumberOfThreads?: number
) {
- super(numberOfThreads, filePath, opts)
+ super(numberOfThreads, filePath, opts, maximumNumberOfThreads)
}
/** @inheritDoc */
}
/** @inheritDoc */
- protected async destroyWorker (
- worker: ThreadWorkerWithMessageChannel
- ): Promise<void> {
- this.sendToWorker(worker, { kill: 1 })
- await worker.terminate()
+ protected sendToWorker (
+ workerNodeKey: number,
+ message: MessageValue<Data>,
+ transferList?: readonly TransferListItem[]
+ ): void {
+ this.workerNodes[workerNodeKey]?.messageChannel?.port1.postMessage(
+ {
+ ...message,
+ workerId: this.getWorkerInfo(workerNodeKey)?.id,
+ } satisfies MessageValue<Data>,
+ transferList
+ )
}
/** @inheritDoc */
- protected sendToWorker (
- worker: ThreadWorkerWithMessageChannel,
- message: MessageValue<Data>
- ): void {
- worker.postMessage(message)
+ protected sendStartupMessageToWorker (workerNodeKey: number): void {
+ const workerNode = this.workerNodes[workerNodeKey]
+ // eslint-disable-next-line @typescript-eslint/no-non-null-assertion
+ const port2 = workerNode.messageChannel!.port2
+ workerNode.worker.postMessage(
+ {
+ ready: false,
+ workerId: this.getWorkerInfo(workerNodeKey)?.id,
+ port: port2,
+ } satisfies MessageValue<Data>,
+ [port2]
+ )
}
/** @inheritDoc */
protected registerWorkerMessageListener<Message extends Data | Response>(
- worker: ThreadWorkerWithMessageChannel,
+ workerNodeKey: number,
listener: (message: MessageValue<Message>) => void
): void {
- worker.port2?.on('message', listener)
+ this.workerNodes[workerNodeKey].messageChannel?.port1.on(
+ 'message',
+ listener
+ )
}
/** @inheritDoc */
- protected createWorker (): ThreadWorkerWithMessageChannel {
- return new Worker(this.filePath, {
- env: SHARE_ENV
- })
+ protected registerOnceWorkerMessageListener<Message extends Data | Response>(
+ workerNodeKey: number,
+ listener: (message: MessageValue<Message>) => void
+ ): void {
+ this.workerNodes[workerNodeKey].messageChannel?.port1.once(
+ 'message',
+ listener
+ )
}
/** @inheritDoc */
- protected afterWorkerSetup (worker: ThreadWorkerWithMessageChannel): void {
- const { port1, port2 } = new MessageChannel()
- worker.postMessage({ parent: port1 }, [port1])
- worker.port1 = port1
- worker.port2 = port2
- // Listen to worker messages.
- this.registerWorkerMessageListener(worker, super.workerListener())
+ protected deregisterWorkerMessageListener<Message extends Data | Response>(
+ workerNodeKey: number,
+ listener: (message: MessageValue<Message>) => void
+ ): void {
+ this.workerNodes[workerNodeKey].messageChannel?.port1.off(
+ 'message',
+ listener
+ )
}
/** @inheritDoc */
- protected get type (): PoolType {
- return PoolTypes.fixed
+ protected shallCreateDynamicWorker (): boolean {
+ return false
}
/** @inheritDoc */
- protected get worker (): WorkerType {
- return WorkerTypes.thread
+ protected checkAndEmitDynamicWorkerCreationEvents (): void {
+ /* noop */
}
/** @inheritDoc */
- protected get minSize (): number {
- return this.numberOfWorkers
+ protected get type (): PoolType {
+ return PoolTypes.fixed
}
/** @inheritDoc */
- protected get maxSize (): number {
- return this.numberOfWorkers
+ protected get worker (): WorkerType {
+ return WorkerTypes.thread
}
/** @inheritDoc */