Function ObserverProxy

recipes/Python/413701_ObserverProxy/recipe-413701.py:1–19

(method_names)

def ObserverProxy(method_names):
    class Proxy:
        def __init__(self):
            self._observers = []
        def add_observer(self, observer):
            self._observers.append(observer)
        def remove_observer(self, observer):
            self._observers.remove(observer)

    def create_method_proxy(method_name):
        def method_proxy(self, *args, **kwargs):
            for observer in self._observers:
                getattr(observer, method_name)(*args, **kwargs)
        return method_proxy

    for method_name in method_names:
        setattr(Proxy, method_name, create_method_proxy(method_name))

    return Proxy()

if __name__ == "__main__":
    # usage example