Extract selection strategies to classes (#176)

[poolifier.git] / src / pools / thread / dynamic.ts

diff --git a/src/pools/thread/dynamic.ts b/src/pools/thread/dynamic.ts
index c10333158002bdb7ec16d3aec688746d42e3273f..fcf4b2ff4652b58b3050adbd46153d4b9ca2c10c 100644 (file)
--- a/src/pools/thread/dynamic.ts
+++ b/src/pools/thread/dynamic.ts
@@ -1,4 +1,3 @@
-import type { JSONValue, MessageValue } from '../../utility-types'
 import type { PoolOptions } from '../abstract-pool'
 import type { ThreadWorkerWithMessageChannel } from './fixed'
 import { FixedThreadPool } from './fixed'
@@ -9,69 +8,35 @@ 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 {
-    let worker: ThreadWorkerWithMessageChannel | undefined
-    for (const entry of this.tasks) {
-      if (entry[1] === 0) {
-        worker = entry[0]
-        break
-      }
-    }
-
-    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.createAndSetupWorker()
-      worker.port2?.on('message', (message: MessageValue<Data>) => {
-        if (message.kill) {
-          this.sendToWorker(worker, { kill: 1 })
-          void this.destroyWorker(worker)
-          this.removeWorker(worker)
-        }
-      })
-      return worker
-    }
+  /** @inheritdoc */
+  public isDynamic (): boolean {
+    return true
   }
 }