-import type { JSONValue } from '../../utility-types'
import type { PoolOptions } from '../abstract-pool'
import type { ThreadWorkerWithMessageChannel } from './fixed'
import { FixedThreadPool } from './fixed'
* This thread pool creates new threads when the others are busy, up to the maximum number of threads.
* When the maximum number of threads is reached, an event is emitted. If you want to listen to this event, use the pool's `emitter`.
*
- * @template Data Type of data sent to the worker.
- * @template Response Type of response of execution.
+ * @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.
*
* @author [Alessandro Pio Ardizio](https://github.com/pioardi)
* @since 0.0.1
*/
export class DynamicThreadPool<
- Data extends JSONValue = JSONValue,
- Response extends JSONValue = JSONValue
+ Data = unknown,
+ Response = unknown
> extends FixedThreadPool<Data, Response> {
/**
* Constructs a new poolifier dynamic thread pool.
*
* @param min Minimum number of threads which are always active.
* @param max Maximum number of threads that can be created by this pool.
- * @param filename Path to an implementation of a `ThreadWorker` file, which can be relative or absolute.
- * @param opts Options for this fixed thread pool. Default: `{ maxTasks: 1000 }`
+ * @param filePath Path to an implementation of a `ThreadWorker` file, which can be relative or absolute.
+ * @param opts Options for this dynamic thread pool. Default: `{ maxTasks: 1000 }`
*/
public constructor (
min: number,
public readonly max: number,
- filename: string,
+ filePath: string,
opts: PoolOptions<ThreadWorkerWithMessageChannel> = { maxTasks: 1000 }
) {
- super(min, filename, opts)
+ super(min, filePath, opts)
}
- /**
- * Choose a thread for the next task.
- *
- * It will first check for and return an idle thread.
- * If all threads are busy, then it will try to create a new one up to the `max` thread count.
- * If the max thread count is reached, the emitter will emit a `FullPool` event and it will fall back to using a round robin algorithm to distribute the load.
- *
- * @returns Thread worker.
- */
- protected chooseWorker (): ThreadWorkerWithMessageChannel {
- for (const [worker, numberOfTasks] of this.tasks) {
- if (numberOfTasks === 0) {
- // A worker is free, use it
- return worker
- }
- }
-
- if (this.workers.length === this.max) {
- this.emitter.emit('FullPool')
- return super.chooseWorker()
- }
-
- // All workers are busy, create a new worker
- const worker = this.createAndSetupWorker()
- this.registerWorkerMessageListener<Data>(worker, message => {
- if (message.kill) {
- this.sendToWorker(worker, { kill: 1 })
- void this.destroyWorker(worker)
- }
- })
- return worker
+ /** @inheritdoc */
+ public isDynamic (): boolean {
+ return true
}
}