Contents tagged with service orientation

• Dec 12 2011

  Dependency Injection Example - Constructor Injection and Service Orientation

  With all the talk on weblogs or technical conversations within my own organization about DI it's difficult to ignore it as little more than the latest "new black" pattern. I've given it some considerable thought and until quite recently didn't really comprehend the overall niftiness of the DI approach. As with anything else it took a moment of "a-HA" to really grasp the power of DI; I was developing a custom CruiseControl.Net build plugin and realized that the plugins are injected dynamically at construction time. If you debug  one of these plugins, you'll notice that the plugin constructors don't match a common parameter structure. The one commonality throughout all the plugins I was investigating as examples for my own education seemed to be in the parameter types - they were all interfaces, implementations of which were usually stored in the CCNet server application domain.

• Dec 12 2011

  Using a ServiceContainer with Delegates - Truly Simple Services

  While working with a colleague on a project I got into a debate about event-handling versus delegates stuffed into a service container. It sounded weird to me at the time; I've always been a huge fan of event-driven programming so I tend to lean that way when I need to make my objects responsive to one another. The way my colleague looks at it, "everything's a service, so if you just add your methods that you need to run to your service container you can call them when you need them." The idea seemed truly nutty to me so I just had to code it up. It is important to note here that our system already made use of the ServiceContainer approach. We have a custom service container that our applications use; in this way we can add any service to the container at run-time and provide our whole application (and all of it's components) with access to everything via the service container. If you're not familliar with that approach this may seem a little off-kilter.