david91

In the application I am coding myself (MVC) I am using dependency injection to pass an object its dependencies. I don't want to use the Singleton pattern or a dependency injection container. When the application starts up it has some procedural code instantiating important objects like this: (It loads up more objects than below but they should be enough to explain what I am on about) /* * ------------------------------------------------------ * INSTANTIATE THE APPLICATION CLASS * ------------------------------------------------------ */ $app = new App(); $app->environment('development'); /* * ------------------------------------------------------ * INSTANTIATE THE CONFIGURATION CLASS * ------------------------------------------------------ */ $config = new Config(); /* * ------------------------------------------------------ * INSTANTIATE THE LOGGER CLASS * ------------------------------------------------------ */ $logger = new Logger($config); /* * ------------------------------------------------------ * INSTANTIATE THE LOCALE CLASS * ------------------------------------------------------ */ $locale = new Locale(); /* * ------------------------------------------------------ * INSTANTIATE THE HTTP RESPONSE CLASS * ------------------------------------------------------ */ $httpResponse = new HttpResponse(); /* * ------------------------------------------------------ * INSTANTIATE THE ROUTER CLASS * ------------------------------------------------------ */ $router = new Router($config, $logger, $httpResponse); $router->route(); As you can see the $logger object depends on the $config object and I inject the $config object into the $logger objects constructor. Now, as you can see when I am instantiating the $router object it has 3 dependencies ($config, $logger and $httpResponse). I just feel it's weird how the $logger object holds the $config object within it so anywhere I inject the $config object and the $logger object into an object like in the $router object I feel like I'm injecting the $config object twice and that it's wrong. Obiously when I have more and more objects and dependencies it will seem like I am injecting the same object more than two or three times and that will really make me wonder if I'm doing it wrong. Is what I'm doing ok? Thanks.