fix

src/message_broker.h

@@ -0,0 +1,29 @@
+#pragma once
+#include <functional>
+#include <string>
+#include <queue>
+#include <mutex>
+#include <condition_variable>
+#include <thread>
+#include <atomic>
+#include <vector>
+
+class MessageBroker {
+public:
+    using MessageCallback = std::function<void(const std::string &message)>;
+
+    void publish(const std::string &message);
+    void subscribe(const MessageCallback &callback);
+    void start();
+    void stop();
+
+private:
+    std::queue<std::string> messageQueue;
+    std::vector<MessageCallback> subscribers;
+    std::mutex mutex;
+    std::condition_variable cv;
+    std::atomic<bool> running{false};
+    std::thread brokerThread;
+
+    void processMessages();
+};