Better Faster Lighter Java [Electronic resources] نسخه متنی

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Better Faster Lighter Java [Electronic resources] - نسخه متنی

Justin Gehtland; Bruce A. Tate

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8.6 Summary

I've chosen the jPetStore
application for a variety of reasons. The biggest is that you can
quickly see the difference between a simple, fast, light application
and the alternative. If you are not yet a believer, I challenge you
to look up the EJB version of Pet Store. If you've
never seen it, you'll be blown away by the
difference. Our version is transparent and independent; the EJB
example is invasive and dependent on the container. Ours is easy to
understand, whereas the J2EE counterpart was buried under the
complexity of EJB best practices.

I haven't always been a believer. In fact, I
didn't know who Rod Johnson was before we were
introduced in Boston at a conference. I've since
come to appreciate this simple framework as elegant and important. If
you're new to Spring, you've seen
only a single application. I hope that through it, you can see how it
embraces the principles in this book:

Keep it simple

Spring's easy to use and understand. In a single
chapter, our example covers an application with transactions,
persistence, a full web frontend, and a completely modular
configuration engine.

Do one thing, and do it well

Spring's framework has many different aspects and
subframeworks. However, it separates each concept nicely. The
fundamental value of Spring is the bean factory and configuration
service, which let you manage dependencies without coupling your
code. Each additional layer of Spring is cleanly decoupled and

Strive for transparency

Spring applications don't need to rely on the basic
container at all. In fact, they can easily exist outside of the
container. You need only create and configure them manually. This
ability makes Spring applications a joy to test.

You are what you eat

Spring makes smart choices in the frameworks that it includes. The
respected Apache projects for data sources and logging form a good
foundation. Spring allows many configurable choices, letting you
choose the best frameworks for a given solution.

Allow for extension

Spring may be the most open, extensible container in existence today.
It allows effective and rapid extension with common configuration
services and clean abstractions.

I haven't covered Spring in its entirety. My goal is
only to show you that it's possible to build
real-world applications that embrace the concepts set out in the
first six chapters of this book. If you decide that
you'd like to see more, make sure that you look into
Spring's advanced features:

Integration with Hibernate and JDO

AOP concepts

Transactional templates with JTA support

In the chapters to come, we continue to explore practical examples of
the principles in this book. You'll see an
implementation of a service called Simple Spider, and see that
service integrated into Spring. Then, you'll be able
to see the benefits of improved maintenance of a framework like this
going forward.

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