JSONValue can not be used by custom defined interfaces (#201)

[poolifier.git] / src / worker / thread-worker.ts

diff --git a/src/worker/thread-worker.ts b/src/worker/thread-worker.ts
index d0af904bfb16d9fd2ba396684a12fd2220d3c89e..1070ed31d7822a86e6b2d4f96c5a9b7c7274b8dc 100644 (file)
--- a/src/worker/thread-worker.ts
+++ b/src/worker/thread-worker.ts
@@ -1,97 +1,39 @@
-import { AsyncResource } from 'async_hooks'
+import type { MessagePort } from 'worker_threads'
 import { isMainThread, parentPort } from 'worker_threads'
 import type { MessageValue } from '../utility-types'
+import { AbstractWorker } from './abstract-worker'
 import type { WorkerOptions } from './worker-options'
 
 /**
- * An example worker that will be always alive, you just need to **extend** this class if you want a static pool.
+ * A thread worker used by a poolifier `ThreadPool`.
  *
- * When this worker is inactive for more than 1 minute, it will send this info to the main thread,
- * if you are using DynamicThreadPool, the workers created after will be killed, the min num of thread will be guaranteed.
+ * When this worker is inactive for more than the given `maxInactiveTime`,
+ * it will send a termination request to its main thread.
+ *
+ * If you use a `DynamicThreadPool` the extra workers that were created will be terminated,
+ * but the minimum number of workers will be guaranteed.
+ *
+ * @template Data Type of data this worker receives from pool's execution. This can only be serializable data.
+ * @template Response Type of response the worker sends back to the main thread. This can only be serializable data.
  *
  * @author [Alessandro Pio Ardizio](https://github.com/pioardi)
  * @since 0.0.1
  */
-// eslint-disable-next-line @typescript-eslint/no-explicit-any
-export class ThreadWorker<Data = any, Response = any> extends AsyncResource {
-  protected readonly maxInactiveTime: number
-  protected readonly async: boolean
-  protected lastTask: number
-  protected readonly interval?: NodeJS.Timeout
-  protected parent?: MessagePort
-
-  public constructor (
-    fn: (data: Data) => Response,
-    public readonly opts: WorkerOptions = {}
-  ) {
-    super('worker-thread-pool:pioardi')
-
-    this.maxInactiveTime = this.opts.maxInactiveTime ?? 1000 * 60
-    this.async = !!this.opts.async
-    this.lastTask = Date.now()
-    if (!fn) throw new Error('Fn parameter is mandatory')
-    // keep the worker active
-    if (!isMainThread) {
-      this.interval = setInterval(
-        this.checkAlive.bind(this),
-        this.maxInactiveTime / 2
-      )
-      this.checkAlive.bind(this)()
-    }
-    parentPort?.on('message', (value: MessageValue<Data>) => {
-      if (value?.data && value.id) {
-        // here you will receive messages
-        // console.log('This is the main thread ' + isMainThread)
-        if (this.async) {
-          this.runInAsyncScope(this.runAsync.bind(this), this, fn, value)
-        } else {
-          this.runInAsyncScope(this.run.bind(this), this, fn, value)
-        }
-      } else if (value.parent) {
-        // save the port to communicate with the main thread
-        // this will be received once
-        this.parent = value.parent
-      } else if (value.kill) {
-        // here is time to kill this thread, just clearing the interval
-        if (this.interval) clearInterval(this.interval)
-        this.emitDestroy()
-      }
-    })
-  }
-
-  protected checkAlive (): void {
-    if (Date.now() - this.lastTask > this.maxInactiveTime) {
-      this.parent?.postMessage({ kill: 1 })
-    }
-  }
-
-  protected run (
-    fn: (data?: Data) => Response,
-    value: MessageValue<Data>
-  ): void {
-    try {
-      const res = fn(value.data)
-      this.parent?.postMessage({ data: res, id: value.id })
-      this.lastTask = Date.now()
-    } catch (e) {
-      this.parent?.postMessage({ error: e, id: value.id })
-      this.lastTask = Date.now()
-    }
+export class ThreadWorker<
+  Data = unknown,
+  Response = unknown
+> extends AbstractWorker<MessagePort, Data, Response> {
+  /**
+   * Constructs a new poolifier thread worker.
+   *
+   * @param fn Function processed by the worker when the pool's `execution` function is invoked.
+   * @param opts Options for the worker.
+   */
+  public constructor (fn: (data: Data) => Response, opts: WorkerOptions = {}) {
+    super('worker-thread-pool:pioardi', isMainThread, fn, parentPort, opts)
   }
 
-  protected runAsync (
-    fn: (data?: Data) => Promise<Response>,
-    value: MessageValue<Data>
-  ): void {
-    fn(value.data)
-      .then(res => {
-        this.parent?.postMessage({ data: res, id: value.id })
-        this.lastTask = Date.now()
-        return null
-      })
-      .catch(e => {
-        this.parent?.postMessage({ error: e, id: value.id })
-        this.lastTask = Date.now()
-      })
+  protected sendToMainWorker (message: MessageValue<Response>): void {
+    this.getMainWorker().postMessage(message)
   }
 }