X-Git-Url: https://git.piment-noir.org/?a=blobdiff_plain;f=src%2Fworker%2FWorkerSet.ts;h=7ddc96c73c27febb8a179a9faa4da6ee01c0615a;hb=c81424b89ca5184eea982c355791f658b4064ce7;hp=da1e5dd5b7b47cbf44291f2aa446ad9b154ae4c7;hpb=8baf3f8f3e3330c90cbd3474b6f5c7d589be17ff;p=e-mobility-charging-stations-simulator.git

diff --git a/src/worker/WorkerSet.ts b/src/worker/WorkerSet.ts
index da1e5dd5..7ddc96c7 100644
--- a/src/worker/WorkerSet.ts
+++ b/src/worker/WorkerSet.ts
@@ -1,30 +1,67 @@
 // Partial Copyright Jerome Benoit. 2021-2023. All Rights Reserved.
 
-import { Worker } from 'node:worker_threads';
+import { EventEmitter } from 'node:events';
+import { SHARE_ENV, Worker } from 'node:worker_threads';
 
 import { WorkerAbstract } from './WorkerAbstract';
-import { WorkerConstants } from './WorkerConstants';
+import { EMPTY_FUNCTION, workerSetVersion } from './WorkerConstants';
 import {
-  type MessageHandler,
+  type SetInfo,
   type WorkerData,
+  type WorkerMessage,
   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!: EventEmitter;
   private readonly workerSet: Set<WorkerSetElement>;
+  private started: boolean;
+  private workerStartup: boolean;
 
   /**
-   * Create a new `WorkerSet`.
+   * Creates a new `WorkerSet`.
    *
    * @param workerScript -
    * @param workerOptions -
    */
-  constructor(workerScript: string, workerOptions?: WorkerOptions) {
+  constructor(workerScript: string, workerOptions: WorkerOptions) {
     super(workerScript, workerOptions);
+    if (
+      this.workerOptions.elementsPerWorker === null ||
+      this.workerOptions.elementsPerWorker === undefined
+    ) {
+      throw new TypeError('Elements per worker is not defined');
+    }
+    if (!Number.isSafeInteger(this.workerOptions.elementsPerWorker)) {
+      throw new TypeError('Elements per worker must be an integer');
+    }
+    if (this.workerOptions.elementsPerWorker <= 0) {
+      throw new RangeError('Elements per worker must be greater than zero');
+    }
     this.workerSet = new Set<WorkerSetElement>();
+    if (this.workerOptions.poolOptions?.enableEvents) {
+      this.emitter = new EventEmitter();
+    }
+    this.started = false;
+    this.workerStartup = false;
+  }
+
+  get info(): SetInfo {
+    return {
+      version: workerSetVersion,
+      type: 'set',
+      worker: 'thread',
+      size: this.size,
+      elementsExecuting: [...this.workerSet].reduce(
+        (accumulator, workerSetElement) => accumulator + workerSetElement.numberOfWorkerElements,
+        0,
+      ),
+      elementsPerWorker: this.maxElementsPerWorker!,
+    };
   }
 
   get size(): number {
@@ -35,75 +72,111 @@ export class WorkerSet extends WorkerAbstract<WorkerData> {
     return this.workerOptions.elementsPerWorker;
   }
 
-  /** @inheritDoc */
-  public async addElement(elementData: WorkerData): Promise<void> {
-    if (!this.workerSet) {
-      throw new Error("Cannot add a WorkerSet element: workers' set does not exist");
-    }
-    let lastWorkerSetElement = this.getLastWorkerSetElement();
-    if (
-      this.workerSet.size === 0 ||
-      lastWorkerSetElement.numberOfWorkerElements >= this.workerOptions.elementsPerWorker
-    ) {
-      this.startWorker();
-      // Start worker sequentially to optimize memory at startup
-      this.workerOptions.workerStartDelay > 0 && (await sleep(this.workerOptions.workerStartDelay));
-      lastWorkerSetElement = this.getLastWorkerSetElement();
-    }
-    lastWorkerSetElement.worker.postMessage({
-      id: WorkerMessageEvents.startWorkerElement,
-      data: elementData,
-    });
-    ++lastWorkerSetElement.numberOfWorkerElements;
-    // Start element sequentially to optimize memory at startup
-    if (this.workerOptions.elementStartDelay > 0) {
-      await sleep(this.workerOptions.elementStartDelay);
-    }
-  }
-
   /** @inheritDoc */
   public async start(): Promise<void> {
-    this.startWorker();
-    // Start worker sequentially to optimize memory at startup
-    this.workerOptions.workerStartDelay > 0 && (await sleep(this.workerOptions.workerStartDelay));
+    this.addWorkerSetElement();
+    // Add worker set element sequentially to optimize memory at startup
+    this.workerOptions.workerStartDelay! > 0 && (await sleep(this.workerOptions.workerStartDelay!));
+    this.started = true;
   }
 
   /** @inheritDoc */
   public async stop(): Promise<void> {
     for (const workerSetElement of this.workerSet) {
-      await workerSetElement.worker.terminate();
+      const worker = workerSetElement.worker;
+      const waitWorkerExit = new Promise<void>((resolve) => {
+        worker.on('exit', () => {
+          resolve();
+        });
+      });
+      await worker.terminate();
+      await waitWorkerExit;
+      this.started = false;
+    }
+  }
+
+  /** @inheritDoc */
+  public async addElement(elementData: WorkerData): Promise<void> {
+    if (!this.started) {
+      throw new Error('Cannot add a WorkerSet element: not started');
+    }
+    if (!this.workerSet) {
+      throw new Error("Cannot add a WorkerSet element: 'workerSet' property does not exist");
+    }
+    const workerSetElement = await this.getWorkerSetElement();
+    workerSetElement.worker.postMessage({
+      event: WorkerMessageEvents.startWorkerElement,
+      data: elementData,
+    });
+    ++workerSetElement.numberOfWorkerElements;
+    // Add element sequentially to optimize memory at startup
+    if (this.workerOptions.elementStartDelay! > 0) {
+      await sleep(this.workerOptions.elementStartDelay!);
     }
-    this.workerSet.clear();
   }
 
   /**
-   * Start a new `Worker`.
+   * Adds a new `WorkerSetElement`.
    */
-  private startWorker(): void {
-    const worker = new Worker(this.workerScript);
-    worker.on(
-      'message',
-      (this.workerOptions?.messageHandler ?? WorkerConstants.EMPTY_FUNCTION).bind(
-        this
-      ) as MessageHandler<Worker>
+  private addWorkerSetElement(): WorkerSetElement {
+    this.workerStartup = true;
+    const worker = new Worker(this.workerScript, {
+      env: SHARE_ENV,
+      ...this.workerOptions.poolOptions?.workerOptions,
+    });
+    worker.on('message', this.workerOptions.poolOptions?.messageHandler ?? EMPTY_FUNCTION);
+    worker.on('message', (message: WorkerMessage<WorkerData>) => {
+      if (message.event === WorkerMessageEvents.startedWorkerElement) {
+        this.emitter?.emit(WorkerSetEvents.elementStarted, this.info);
+      } else if (message.event === WorkerMessageEvents.startWorkerElementError) {
+        this.emitter?.emit(WorkerSetEvents.elementError, message.data);
+      }
+    });
+    worker.on('error', this.workerOptions.poolOptions?.errorHandler ?? EMPTY_FUNCTION);
+    worker.on('error', (error) => {
+      this.emitter?.emit(WorkerSetEvents.error, error);
+      if (
+        this.workerOptions.poolOptions?.restartWorkerOnError &&
+        this.started &&
+        !this.workerStartup
+      ) {
+        this.addWorkerSetElement();
+      }
+    });
+    worker.on('online', this.workerOptions.poolOptions?.onlineHandler ?? EMPTY_FUNCTION);
+    worker.on('exit', this.workerOptions.poolOptions?.exitHandler ?? EMPTY_FUNCTION);
+    worker.once('exit', () =>
+      this.removeWorkerSetElement(this.getWorkerSetElementByWorker(worker)!),
     );
-    worker.on('error', defaultErrorHandler.bind(this) as (err: Error) => void);
-    worker.on('error', () => this.startWorker());
-    worker.on('exit', defaultExitHandler.bind(this) as (exitCode: number) => void);
-    worker.on('exit', () => this.workerSet.delete(this.getWorkerSetElementByWorker(worker)));
-    this.workerSet.add({ worker, numberOfWorkerElements: 0 });
+    const workerSetElement: WorkerSetElement = { worker, numberOfWorkerElements: 0 };
+    this.workerSet.add(workerSetElement);
+    this.workerStartup = false;
+    return workerSetElement;
+  }
+
+  private removeWorkerSetElement(workerSetElement: WorkerSetElement): void {
+    this.workerSet.delete(workerSetElement);
   }
 
-  private getLastWorkerSetElement(): WorkerSetElement {
-    let workerSetElement: WorkerSetElement;
-    for (workerSetElement of this.workerSet) {
-      /* This is intentional */
+  private async getWorkerSetElement(): Promise<WorkerSetElement> {
+    let chosenWorkerSetElement: WorkerSetElement | undefined;
+    for (const workerSetElement of this.workerSet) {
+      if (workerSetElement.numberOfWorkerElements < this.workerOptions.elementsPerWorker!) {
+        chosenWorkerSetElement = workerSetElement;
+        break;
+      }
     }
-    return workerSetElement;
+    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 {
-    let workerSetElt: WorkerSetElement;
+  private getWorkerSetElementByWorker(worker: Worker): WorkerSetElement | undefined {
+    let workerSetElt: WorkerSetElement | undefined;
     for (const workerSetElement of this.workerSet) {
       if (workerSetElement.worker.threadId === worker.threadId) {
         workerSetElt = workerSetElement;