-import type { JSONValue, MessageValue } from '../../utility-types'
+import type { JSONValue } from '../../utility-types'
import type { PoolOptions } from '../abstract-pool'
import type { ThreadWorkerWithMessageChannel } from './fixed'
import { FixedThreadPool } from './fixed'
* 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 {
- let worker: ThreadWorkerWithMessageChannel | undefined
- for (const entry of this.tasks) {
- if (entry[1] === 0) {
- worker = entry[0]
- break
+ for (const [worker, numberOfTasks] of this.tasks) {
+ if (numberOfTasks === 0) {
+ // A worker is free, use it
+ return worker
}
}
- if (worker) {
- // a worker is free, use it
- return worker
- } else {
- if (this.workers.length === this.max) {
- this.emitter.emit('FullPool')
- return super.chooseWorker()
- }
- // all workers are busy create a new worker
- const worker = this.internalNewWorker()
- worker.port2?.on('message', (message: MessageValue<Data>) => {
- if (message.kill) {
- this.sendToWorker(worker, { kill: 1 })
- void this.destroyWorker(worker)
- this.removeWorker(worker)
- }
- })
- 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
}
}