Clean worker from pool after it was destroyed (#146)

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

diff --git a/src/pools/cluster/dynamic.ts b/src/pools/cluster/dynamic.ts
index 25940ad84340f43f3e7b0abf5cec7ddf3edbc8d4..432feb3abb6b91017540561efcaa4f48608869da 100644 (file)
--- a/src/pools/cluster/dynamic.ts
+++ b/src/pools/cluster/dynamic.ts
@@ -4,10 +4,13 @@ import type { ClusterPoolOptions } from './fixed'
 import { FixedClusterPool } from './fixed'
 
 /**
- * A cluster pool with a min/max number of workers, is possible to execute tasks in sync or async mode as you prefer.
+ * A cluster pool with a dynamic number of workers, but a guaranteed minimum number of workers.
  *
- * This cluster pool will create new workers when the other ones are busy, until the max number of workers,
- * when the max number of workers is reached, an event will be emitted, if you want to listen this event use the emitter method.
+ * This cluster pool creates new workers when the others are busy, up to the maximum number of workers.
+ * When the maximum number of workers 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.
  *
  * @author [Christopher Quadflieg](https://github.com/Shinigami92)
  * @since 2.0.0
@@ -17,10 +20,12 @@ export class DynamicClusterPool<
   Response extends JSONValue = JSONValue
 > extends FixedClusterPool<Data, Response> {
   /**
-   * @param min Min number of workers that will be always active
-   * @param max Max number of workers that will be active
-   * @param filename A file path with implementation of `ClusterWorker` class, relative path is fine.
-   * @param opts An object with possible options for example `errorHandler`, `onlineHandler`. Default: `{ maxTasks: 1000 }`
+   * Constructs a new poolifier dynamic cluster pool.
+   *
+   * @param min Minimum number of workers which are always active.
+   * @param max Maximum number of workers that can be created by this pool.
+   * @param filename Path to an implementation of a `ClusterWorker` file, which can be relative or absolute.
+   * @param opts Options for this fixed cluster pool. Default: `{ maxTasks: 1000 }`
    */
   public constructor (
     min: number,
@@ -31,6 +36,15 @@ export class DynamicClusterPool<
     super(min, filename, opts)
   }
 
+  /**
+   * Choose a worker for the next task.
+   *
+   * It will first check for and return an idle worker.
+   * If all workers are busy, then it will try to create a new one up to the `max` worker count.
+   * If the max worker 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 Cluster worker.
+   */
   protected chooseWorker (): Worker {
     let worker: Worker | undefined
     for (const entry of this.tasks) {
@@ -41,20 +55,19 @@ export class DynamicClusterPool<
     }
 
     if (worker) {
-      // a worker is free, use it
+      // 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()
+      // All workers are busy, create a new worker
+      const worker = this.createAndSetupWorker()
       worker.on('message', (message: MessageValue<Data>) => {
         if (message.kill) {
           this.sendToWorker(worker, { kill: 1 })
           void this.destroyWorker(worker)
-          this.removeWorker(worker)
         }
       })
       return worker