feat: Re-compute the given items cost job.

feat: Optimize the architecture.

server/src/decorators/eventDispatcher.ts

@@ -0,0 +1,16 @@
+/**
+ * Originally taken from 'w3tecch/express-typescript-boilerplate'
+ * Credits to the author
+ */
+
+import { EventDispatcher as EventDispatcherClass } from 'event-dispatch';
+import { Container } from 'typedi';
+
+export function EventDispatcher() {
+  return (object: any, propertyName: string, index?: number): void => {
+    const eventDispatcher = new EventDispatcherClass();
+    Container.registerHandler({ object, propertyName, index, value: () => eventDispatcher });
+  };
+}
+
+export { EventDispatcher as EventDispatcherInterface } from 'event-dispatch';