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by bborud
4884 days ago
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> new Repository(new SessionFactory(new Configuration()))
> Writing that code is pretty painful. If you think you are making things less painful by obfuscating the code snippet above I would challenge you to think about what you are doing. The above is incredibly clear. There is no doubt what is happening and if you screw up the compiler will yell at you. If you obfuscate it through annotations and force readers of your code to try to reason about how the system will behave runtime, you have added exactly zero value. You have only degraded the readability and understandability of the system. A little extra typing never killed anyone. |
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I'd argue a few things here:
1. An IoC container that relies on annotations or XML configuration is not an IoC container that you should be using. Unless you're using an IoC container to help with field configuration, component registration needs to be done through a fluent API so that it's strongly typed and right there in the code where everyone can see it. A well-crafted registration routine should be every bit as readable as the hand-coded factory it replaces, if not more so.
2. Code that's architected in such a way that you need to understand explicit details about the order or manner in which objects are instantiated is code that is not ready to be used with an IoC container. The SOLID principles are a non-negotiable prerequisite of any IoC container. If you haven't drank that Kool-Aid, an IoC container doesn't really have a lot to offer.[1]
3. It's not about making individual snippets of code less painful. It's about making the long-term maintenance of the application - or, for preference, an entire suite of applications - less painful.
1: http://kozmic.net/2012/10/23/ioc-container-solves-a-problem-...