Extracting FileController into a Uploader container

uploader/src/Services/ClientEventsEmitter.ts

@@ -0,0 +1,32 @@
+const EventEmitter = require('events');
+
+const clientJoinEvent = 'clientJoin';
+const clientLeaveEvent = 'clientLeave';
+
+class ClientEventsEmitter extends EventEmitter {
+    emitClientJoin(clientUUid: string, roomId: string): void {
+        this.emit(clientJoinEvent, clientUUid, roomId);
+    }
+
+    emitClientLeave(clientUUid: string, roomId: string): void {
+        this.emit(clientLeaveEvent, clientUUid, roomId);
+    }
+    
+    registerToClientJoin(callback: (clientUUid: string, roomId: string) => void): void {
+        this.on(clientJoinEvent, callback);
+    }
+
+    registerToClientLeave(callback: (clientUUid: string, roomId: string) => void): void {
+        this.on(clientLeaveEvent, callback);
+    }
+
+    unregisterFromClientJoin(callback: (clientUUid: string, roomId: string) => void): void {
+        this.removeListener(clientJoinEvent, callback);
+    }
+
+    unregisterFromClientLeave(callback: (clientUUid: string, roomId: string) => void): void {
+        this.removeListener(clientLeaveEvent, callback);
+    }
+}
+
+export const clientEventsEmitter = new ClientEventsEmitter();