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

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

diff --git a/src/pools/thread/dynamic.ts b/src/pools/thread/dynamic.ts
index 77f0a2d569618af2dbbd3d146078ae74be812165..3e74a4ea4b7fe053445f3c204104b13f28e43e65 100644 (file)
--- a/src/pools/thread/dynamic.ts
+++ b/src/pools/thread/dynamic.ts
@@ -1,4 +1,4 @@
-import type { JSONValue, MessageValue } from '../../utility-types'
+import { isKillBehavior, KillBehaviors } from '../../worker/worker-options'
 import type { PoolOptions } from '../abstract-pool'
 import type { ThreadWorkerWithMessageChannel } from './fixed'
 import { FixedThreadPool } from './fixed'
@@ -9,31 +9,31 @@ 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)
   }
 
   /**
@@ -42,34 +42,34 @@ export class DynamicThreadPool<
    * 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 workerCreated = this.createAndSetupWorker()
+    this.registerWorkerMessageListener<Data>(workerCreated, message => {
+      const tasksInProgress = this.tasks.get(workerCreated)
+      if (
+        isKillBehavior(KillBehaviors.HARD, message.kill) ||
+        tasksInProgress === 0
+      ) {
+        // Kill received from the worker, means that no new tasks are submitted to that worker for a while ( > maxInactiveTime)
+        void this.destroyWorker(workerCreated)
+      }
+    })
+    return workerCreated
   }
 }