change handlermanager to use Map to prevent garbage

src/Model/Chat/chatListModel.ts

@@ -108,8 +108,8 @@ export default class ChatListModel {
         this.connectionModel = connectionModel;
         this.loadChats();
 
-        connectionModel.messageHandlerManager.addHandler(this.messageHandler);
-        connectionModel.messageSentHandlerManager.addHandler(
+        connectionModel.messageHandlerManager.setHandler("chat-list", this.messageHandler);
+        connectionModel.messageSentHandlerManager.setHandler("chat-list",
             this.messageSentHandler,
         );
     }

src/Model/Global/fileTransferModel.ts

@@ -133,7 +133,7 @@ export default class FileTransferModel {
         this.storageModel = storageModel;
         this.connectionModel = connectionModel;
 
-        this.connectionModel.messageHandlerManager.addHandler(
+        this.connectionModel.messageHandlerManager.setHandler("file-transfer",
             this.handleMessage,
         );
     }

src/Model/Utility/utility.ts

@@ -173,22 +173,20 @@ export function checkDoesObjectMatchSearch<T>(
 export type Handler<T> = (item: T) => void;
 
 export class HandlerManager<T> {
-    handlers = new Set<Handler<T>>();
+    handlers = new Map<string, Handler<T>>();
 
     // manage
-    addHandler = (handler: Handler<T>): void => {
-        this.handlers.add(handler);
+    setHandler = (id: string, handler: Handler<T>): void => {
+        this.handlers.set(id, handler);
     };
 
-    deleteHandler = (handler: Handler<T>): void => {
-        this.handlers.delete(handler);
+    deleteHandler = (id: string): void => {
+        this.handlers.delete(id);
     };
 
     // trigger
     trigger = (item: T): void => {
-        for (const handler of this.handlers) {
-            handler(item);
-        }
+        [...this.handlers.values()].forEach((handler) => handler(item));
     };
 }