How do I implement the observer pattern in web servers with C++?

The Observer Pattern is a software design pattern in which an object, known as the subject, maintains a list of its dependents, known as observers, and notifies them of state changes, usually by calling one of their methods. This pattern is particularly useful in web servers where certain events need to be broadcast to multiple listeners.

In a web server context, you could use the Observer Pattern to listen for events such as new user registrations, document changes, or system notifications. The following is a simple example of how to implement the Observer Pattern in C++ for a web server application.


        #include 
        #include 
        #include 

        // Observer Interface
        class Observer {
        public:
            virtual void update(const std::string &message) = 0;
        };

        // Subject Class
        class Subject {
        private:
            std::vector observers;
        
        public:
            void addObserver(Observer* observer) {
                observers.push_back(observer);
            }

            void removeObserver(Observer* observer) {
                observers.erase(std::remove(observers.begin(), observers.end(), observer), observers.end());
            }

            void notifyObservers(const std::string &message) {
                for (Observer* observer : observers) {
                    observer->update(message);
                }
            }
        };

        // Concrete Observer
        class ConcreteObserver : public Observer {
        private:
            std::string name;
        
        public:
            ConcreteObserver(const std::string &name) : name(name) {}

            void update(const std::string &message) override {
                std::cout << name << " received: " << message << std::endl;
            }
        };

        // Example Usage
        int main() {
            Subject subject;
            ConcreteObserver observer1("Observer 1");
            ConcreteObserver observer2("Observer 2");

            subject.addObserver(&observer1);
            subject.addObserver(&observer2);

            subject.notifyObservers("New user registered!");

            return 0;
        }

How do I implement the observer pattern in web servers with C++?

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How do I implement the observer pattern in web servers with C++?

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