Dependency injection: design patterns using spring and guice by Dhanji R. Prasanna

By Dhanji R. Prasanna

In object-oriented programming, a critical software in general controls different items in a module, library, or framework. With dependency injection, this trend is inverted—a connection with a carrier is positioned without delay into the thing which eases trying out and modularity. Spring or Google Guice use dependency injection so that you can concentrate on your middle software and enable the framework deal with infrastructural concerns.
Dependency Injection explores the DI idiom in high quality aspect, with various functional examples that convey you the payoffs. Youll practice key suggestions in Spring and Guice and examine vital pitfalls, corner-cases, and layout styles. Readers desire a operating wisdom of Java yet no earlier adventure with DI is thought.

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While C# has ports of some Java libraries like Spring and PicoContainer, it also has some innovative DI of its own, particularly in Castle MicroKernel, which does a lot more than just DI. StructureMap, on the other hand, is a mainstay and a more traditional DI library. Some platforms (or languages) make it harder to design dependency injectors because they lack features such as garbage collection and reflection. C++ is a prime example of such a language. However, it is still possible to write dependency injectors in these languages with other methods that substitute for these tools.

Both return an instance of Emailer. "); This is an important point, because it means that using code for its original, intended purpose remains exactly the same regardless of what library you choose. And it underlines the fact that dependency injection is not an invasive technique. Note also how an injector is created. Rather than using a Factory, I’ve used construction by hand to create a FileSystemApplicationContext and assigned it to a variable of type BeanFactory. Both BeanFactory and FileSystemApplicationContext refer to Spring’s injector.

Obtained an instance of Emailer from the injector. Signaled the Emailer to send an email message. Com Licensed to Gayle M. 6 illustrates this sequence. Let’s break down this example in code. createInjector() We can think of Guice as a factory class for dependency injectors (recall the Factory pattern from chapter 1). This is fairly straightforward. 6 Injector obtains emailer for a client, which is then used to send mail. "); This is reasonable at first glance and seems to have brought us some kind of compelling result.

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