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13 Principles of Software Design
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The list of dependencies is now explicit from the signature of the method and doesn t require you to go down the line to pinpoint calls to a service locator component. In addition, the burden of creating instances for each spot dependency is moved elsewhere.
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Dependency Inversion Real-World Considerations
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Dependency inversion is about layers, and layers don t reduce the total amount of code (quite the reverse, I d say). Layers, however, contribute to readability and, subsequently, to maintainability and testability. In light of this, the motivation for special frameworks such as Inversion of Control (IoC) frameworks is right in front of your eyes. You don t want to write the factory yourself for all instances that populate the graph of dependencies for pieces of your application. The task is repetitive and error prone. Although it might be a boring task for developers, it s just plain business as usual for certain tools. IoC frameworks are just a way for you to be more productive when it comes to implementing the Dependency Inversion principle. These days, we tend to oversimplify things by using the name of the most popular pattern Dependency Injection to refer to the universal principle. Even more often, we just use the name of a family of tools (IoC) to refer to the principle. What really matters is that you give the principle its due consideration. The details of how you actually implement it are up to you and your team. You don t need an IoC tool to implement good dependency injection; you can get it through overloaded constructors (also known as the poor man s dependency injection) or even by writing your own homemade IoC framework. In the simplest case, it s a thin layer of code around some .NET reflection primitives. You can ignore the Dependency Inversion principle, but you do so at your own peril. Note Dependency injection is also fundamental from a testability standpoint because it makes
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it natural to inject dependencies in classes as you test them.
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Tools for Dependency Injection
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The list of tools for dependency injection is quite long in the .NET space nowadays. Most of these tools provide the same set of core functionalities and are, to a large extent, equivalent. Choosing one is often a matter of preference, skill level, and perhaps your comfort with the exposed API. There are some who prefer simplicity and speed and opt for Autofac or Ninject. Others would opt for rich functionality and go for Spring.NET or Castle Windsor. Another
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Part III Design of the Application
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group would pick up the entire Microsoft stack and then use Unity. Table 13-1 lists the most popular options today, with the URL from where you can get further information. Table 13-1 Some Popular IoC Frameworks
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Framework
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Autofac Castle Windsor Ninject Spring.NET StructureMap Unity
http://code.google.com/p/autofac http://www.castleproject.org/container/index.html http://www.ninject.org http://www.springframework.net http://structuremap.sourceforge.net/Default.htm http://codeplex.com/unity
All IoC frameworks are built around a container object that, bound to some configuration information, resolves dependencies. The caller code instantiates the container and passes the desired interface as an argument. In response, the IoC framework returns a concrete object that implements that interface. Let s top off the chapter by taking a quick tour of two frameworks in the Microsoft stack that, although they have different characteristics and goals, can both be employed to implement the Dependency Inversion principle.
Managed Extensibility Framework at a Glance
Introduced with the Microsoft .NET Framework 4, the Managed Extensibility Framework (MEF) attempts to give a consistent answer to the loud demand for tools for building plugin-based applications. A plugin-based application is an application that can rely on a number of optional components that are discovered and composed together at run time. Microsoft Visual Studio is an excellent example of this application; a simpler but still valid example is Windows Explorer, whose menus can be extended by registering shell extensions. A plugin-based application provides a number of extensibility points and builds its core user interface and logic using abstractions for those extensibility points. Some run-time code then attempts to resolve all pending dependencies in a quick and direct way.
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