refactor: null -> undefined where appropriate

[e-mobility-charging-stations-simulator.git] / src / charging-station / ChargingStationWorker.ts

diff --git a/src/charging-station/ChargingStationWorker.ts b/src/charging-station/ChargingStationWorker.ts
index 20a812e496a78f1f128b88a2f33df652ab04ee74..6201bf07e2b52fe7e6d1931412da74e89043717c 100644 (file)
--- a/src/charging-station/ChargingStationWorker.ts
+++ b/src/charging-station/ChargingStationWorker.ts
@@ -1,42 +1,69 @@
-// Partial Copyright Jerome Benoit. 2021. All Rights Reserved.
+// Partial Copyright Jerome Benoit. 2021-2023. All Rights Reserved.
 
-import { ChargingStationWorkerData, WorkerEvents, WorkerMessage } from '../types/Worker';
-import { parentPort, workerData } from 'worker_threads';
+import { AsyncResource } from 'node:async_hooks';
+import { parentPort } from 'node:worker_threads';
 
-import ChargingStation from './ChargingStation';
-import Constants from '../utils/Constants';
 import { ThreadWorker } from 'poolifier';
-import Utils from '../utils/Utils';
 
-// Conditionally export ThreadWorker instance for pool usage
-export let threadWorker: ThreadWorker;
-if (Utils.workerPoolInUse()) {
-  threadWorker = new ThreadWorker<ChargingStationWorkerData>(startChargingStation, { maxInactiveTime: Constants.WORKER_POOL_MAX_INACTIVE_TIME, async: false });
-} else {
-  // Add message listener to start charging station from main thread
-  addMessageListener();
-  if (!Utils.isUndefined(workerData)) {
-    startChargingStation({ index: workerData.index as number, templateFile: workerData.templateFile as string });
-  }
-}
+import { ChargingStation } from './ChargingStation';
+import { BaseError } from '../exception';
+import type { ChargingStationWorkerData } from '../types';
+import { Configuration } from '../utils';
+import { type WorkerMessage, WorkerMessageEvents } from '../worker';
 
-/**
- * Listen messages send by the main thread
- */
-function addMessageListener(): void {
-  parentPort?.on('message', (message: WorkerMessage) => {
-    if (message.id === WorkerEvents.START_WORKER_ELEMENT) {
-      startChargingStation(message.data);
-    }
-  });
-}
+const moduleName = 'ChargingStationWorker';
 
 /**
- * Create and start a charging station instance
+ * Creates and starts a charging station instance
  *
- * @param data workerData
+ * @param data - workerData
  */
-function startChargingStation(data: ChargingStationWorkerData): void {
-  const station = new ChargingStation(data.index, data.templateFile);
-  station.start();
+const startChargingStation = (data?: ChargingStationWorkerData): void => {
+  new ChargingStation(data!.index, data!.templateFile).start();
+};
+
+class ChargingStationWorker extends AsyncResource {
+  constructor() {
+    super(moduleName);
+    // Add message listener to create and start charging station from the main thread
+    parentPort?.on('message', (message: WorkerMessage<ChargingStationWorkerData>) => {
+      switch (message.event) {
+        case WorkerMessageEvents.startWorkerElement:
+          try {
+            this.runInAsyncScope(
+              startChargingStation.bind(this) as (data?: ChargingStationWorkerData) => void,
+              this,
+              message.data,
+            );
+            parentPort?.postMessage({
+              event: WorkerMessageEvents.startedWorkerElement,
+            });
+          } catch (error) {
+            parentPort?.postMessage({
+              event: WorkerMessageEvents.startWorkerElementError,
+              data: {
+                message: (error as Error).message,
+                stack: (error as Error).stack,
+              },
+            });
+          }
+          break;
+        default:
+          throw new BaseError(
+            `Unknown worker event: '${message.event}' received with data: '${JSON.stringify(
+              message.data,
+              undefined,
+              2,
+            )}'`,
+          );
+      }
+    });
+  }
+}
+
+export let chargingStationWorker: ChargingStationWorker | ThreadWorker<ChargingStationWorkerData>;
+if (Configuration.workerPoolInUse()) {
+  chargingStationWorker = new ThreadWorker<ChargingStationWorkerData>(startChargingStation);
+} else {
+  chargingStationWorker = new ChargingStationWorker();
 }