WIP shutdown service implementation

Author: tacxou

service/src/shutdown.service.ts

@@ -0,0 +1,18 @@
+import { OnModuleDestroy } from '@nestjs/common'
+import { Subject } from 'rxjs'
+
+export class ShutdownService implements OnModuleDestroy {
+  private shutdownListener$: Subject<void> = new Subject()
+
+  public onModuleDestroy() {
+    console.log('Executing OnDestroy Hook')
+  }
+
+  public subscribeToShutdown(shutdownFn: () => void): void {
+    this.shutdownListener$.subscribe(() => shutdownFn())
+  }
+
+  public shutdown() {
+    this.shutdownListener$.next()
+  }
+}