X-Git-Url: https://git.piment-noir.org/?a=blobdiff_plain;f=src%2Fworker%2FWorkerSet.ts;h=270f57b1f100c8ab80c0e3fe56fb9bebdb3adf24;hb=628c30e510dd0f12be4432bd5eb0ff86790c4de0;hp=e1fce2e62058a8ee6c5750a7e01a2d48891c164b;hpb=789871d6585093e2ab0444bd7ca063ca86c344f8;p=e-mobility-charging-stations-simulator.git

diff --git a/src/worker/WorkerSet.ts b/src/worker/WorkerSet.ts
index e1fce2e6..270f57b1 100644
--- a/src/worker/WorkerSet.ts
+++ b/src/worker/WorkerSet.ts
@@ -1,30 +1,57 @@
 // Partial Copyright Jerome Benoit. 2021-2023. All Rights Reserved.
 
-import { Worker } from 'node:worker_threads';
+import EventEmitterAsyncResource from 'node:events';
+import { SHARE_ENV, Worker } from 'node:worker_threads';
 
 import { WorkerAbstract } from './WorkerAbstract';
 import { WorkerConstants } from './WorkerConstants';
 import {
-  type MessageHandler,
+  type SetInfo,
   type WorkerData,
   WorkerMessageEvents,
   type WorkerOptions,
   type WorkerSetElement,
+  WorkerSetEvents,
 } from './WorkerTypes';
-import { defaultErrorHandler, defaultExitHandler, sleep } from './WorkerUtils';
+import { sleep } from './WorkerUtils';
 
 export class WorkerSet extends WorkerAbstract<WorkerData> {
+  public readonly emitter: EventEmitterAsyncResource;
   private readonly workerSet: Set<WorkerSetElement>;
 
   /**
-   * Create a new `WorkerSet`.
+   * Creates a new `WorkerSet`.
    *
    * @param workerScript -
    * @param workerOptions -
    */
   constructor(workerScript: string, workerOptions?: WorkerOptions) {
     super(workerScript, workerOptions);
+    this.workerOptions.poolOptions = {
+      ...{
+        enableEvents: true,
+        restartWorkerOnError: true,
+      },
+      ...this.workerOptions.poolOptions,
+    };
     this.workerSet = new Set<WorkerSetElement>();
+    if (this.workerOptions?.poolOptions?.enableEvents) {
+      this.emitter = new EventEmitterAsyncResource();
+    }
+  }
+
+  get info(): SetInfo {
+    return {
+      version: WorkerConstants.version,
+      type: 'set',
+      worker: 'thread',
+      size: this.size,
+      elementsExecuting: [...this.workerSet].reduce(
+        (accumulator, workerSetElement) => accumulator + workerSetElement.numberOfWorkerElements,
+        0
+      ),
+      elementsPerWorker: this.maxElementsPerWorker,
+    };
   }
 
   get size(): number {
@@ -35,88 +62,93 @@ export class WorkerSet extends WorkerAbstract<WorkerData> {
     return this.workerOptions.elementsPerWorker;
   }
 
-  /**
-   *
-   * @param elementData -
-   * @returns
-   * @public
-   */
+  /** @inheritDoc */
+  public async start(): Promise<void> {
+    this.addWorkerSetElement();
+    // Add worker set element sequentially to optimize memory at startup
+    this.workerOptions.workerStartDelay > 0 && (await sleep(this.workerOptions.workerStartDelay));
+  }
+
+  /** @inheritDoc */
+  public async stop(): Promise<void> {
+    for (const workerSetElement of this.workerSet) {
+      await workerSetElement.worker.terminate();
+    }
+    this.workerSet.clear();
+  }
+
+  /** @inheritDoc */
   public async addElement(elementData: WorkerData): Promise<void> {
     if (!this.workerSet) {
       throw new Error("Cannot add a WorkerSet element: workers' set does not exist");
     }
-    if (
-      this.workerSet.size === 0 ||
-      this.getLastWorkerSetElement().numberOfWorkerElements >= this.workerOptions.elementsPerWorker
-    ) {
-      await this.startWorker();
-    }
-    this.getLastWorker().postMessage({
+    const workerSetElement = await this.getWorkerSetElement();
+    workerSetElement.worker.postMessage({
       id: WorkerMessageEvents.startWorkerElement,
       data: elementData,
     });
-    ++this.getLastWorkerSetElement().numberOfWorkerElements;
-    // Start element sequentially to optimize memory at startup
+    ++workerSetElement.numberOfWorkerElements;
+    // Add element sequentially to optimize memory at startup
     if (this.workerOptions.elementStartDelay > 0) {
       await sleep(this.workerOptions.elementStartDelay);
     }
   }
 
   /**
-   *
-   * @returns
-   * @public
-   */
-  public async start(): Promise<void> {
-    await this.startWorker();
-  }
-
-  /**
-   *
-   * @returns
-   * @public
-   */
-  public async stop(): Promise<void> {
-    for (const workerSetElement of this.workerSet) {
-      await workerSetElement.worker.terminate();
-    }
-    this.workerSet.clear();
-  }
-
-  /**
-   * Start a new `Worker`.
+   * Adds a new `WorkerSetElement`.
    */
-  private async startWorker(): Promise<void> {
-    const worker = new Worker(this.workerScript);
+  private addWorkerSetElement(): WorkerSetElement {
+    const worker = new Worker(this.workerScript, {
+      env: SHARE_ENV,
+      ...this.workerOptions.poolOptions.workerOptions,
+    });
     worker.on(
       'message',
-      (this.workerOptions?.messageHandler ?? WorkerConstants.EMPTY_FUNCTION).bind(
-        this
-      ) as MessageHandler<Worker>
+      this.workerOptions?.poolOptions?.messageHandler ?? WorkerConstants.EMPTY_FUNCTION
+    );
+    worker.on(
+      'error',
+      this.workerOptions?.poolOptions?.errorHandler ?? WorkerConstants.EMPTY_FUNCTION
     );
-    worker.on('error', defaultErrorHandler.bind(this) as (err: Error) => void);
-    worker.on('exit', (code) => {
-      defaultExitHandler(code);
-      this.workerSet.delete(this.getWorkerSetElementByWorker(worker));
+    worker.on('error', (error) => {
+      if (this.emitter !== undefined) {
+        this.emitter.emit(WorkerSetEvents.error, error);
+      }
+      if (this.workerOptions?.poolOptions?.restartWorkerOnError) {
+        this.addWorkerSetElement();
+      }
     });
-    this.workerSet.add({ worker, numberOfWorkerElements: 0 });
-    // Start worker sequentially to optimize memory at startup
-    this.workerOptions.workerStartDelay > 0 && (await sleep(this.workerOptions.workerStartDelay));
-  }
-
-  private getLastWorkerSetElement(): WorkerSetElement {
-    let workerSetElement: WorkerSetElement;
-    for (workerSetElement of this.workerSet) {
-      /* This is intentional */
-    }
+    worker.on(
+      'online',
+      this.workerOptions?.poolOptions?.onlineHandler ?? WorkerConstants.EMPTY_FUNCTION
+    );
+    worker.on(
+      'exit',
+      this.workerOptions?.poolOptions?.exitHandler ?? WorkerConstants.EMPTY_FUNCTION
+    );
+    worker.once('exit', () => this.workerSet.delete(this.getWorkerSetElementByWorker(worker)));
+    const workerSetElement: WorkerSetElement = { worker, numberOfWorkerElements: 0 };
+    this.workerSet.add(workerSetElement);
     return workerSetElement;
   }
 
-  private getLastWorker(): Worker {
-    return this.getLastWorkerSetElement().worker;
+  private async getWorkerSetElement(): Promise<WorkerSetElement> {
+    let chosenWorkerSetElement: WorkerSetElement;
+    for (const workerSetElement of this.workerSet) {
+      if (workerSetElement.numberOfWorkerElements < this.workerOptions.elementsPerWorker) {
+        chosenWorkerSetElement = workerSetElement;
+        break;
+      }
+    }
+    if (!chosenWorkerSetElement) {
+      chosenWorkerSetElement = this.addWorkerSetElement();
+      // Add worker set element sequentially to optimize memory at startup
+      this.workerOptions.workerStartDelay > 0 && (await sleep(this.workerOptions.workerStartDelay));
+    }
+    return chosenWorkerSetElement;
   }
 
-  private getWorkerSetElementByWorker(worker: Worker): WorkerSetElement {
+  private getWorkerSetElementByWorker(worker: Worker): WorkerSetElement | undefined {
     let workerSetElt: WorkerSetElement;
     for (const workerSetElement of this.workerSet) {
       if (workerSetElement.worker.threadId === worker.threadId) {