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Using the Container As a Deployment Model
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When you decide to use the Spring Framework in your projects, you will soon find out the Spring container is actually a deployment model. Once all components of your application are configured in Spring XML files, your application can be loaded in a stand-alone application, a web application, or any other type of application. The Spring Framework offers support to deploy applications in these deployment environments: Servlet containers: Tomcat, Jetty, and Resin Application servers: BEA WebLogic, IBM WebSphere, and JBoss Portlet servers: JetSpeed 2 and Pluto Thin clients: Java desktop applications that call remote services over a network Thick clients: Java desktop applications that directly connect to a database Messaging: Applications that connect to message queues and handle incoming messages People use the Spring Framework in a wide range of settings. Although this book is primarily focused on web applications, the chapters that don t cover web-related topics apply to all other environments as well. Part of the reason the Spring Framework is gradually becoming the de facto deployment model for Java EE applications is its integration with almost all popular Java frameworks, which is an extra stimulus to get started with the Spring Framework today.
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Summary
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In this chapter, we introduced the Spring container. You learned about Spring s XML format and the basic features of the container. You also learned about the life cycle of beans that are managed by the container and how to configure factories. We then talked about the ApplicationContext, which has all of the features of the BeanFactory and adds generic resource locations, among other features, to the mix. You ve learned how to create ApplicationContext objects in Java code, in integration tests, and in web applications. The next two chapters cover AOP in the Spring Framework.
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CHAPTER
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Aspect-Oriented Programming
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he biggest part of an application s life starts when it s first deployed in a production environment. Developing the first version may take a while, but once deployed, the application must be maintained and improved, typically for many years. Applications that are deployed and used by businesses and organizations need some form of maintenance over time, which means they need to be maintainable in the first place; that is, applications should be easy to develop and test during development, and afterward they should be easy to maintain. Organizations that can improve their business processes in small incremental steps when they see fit have an important advantage over their competitors. In this chapter, we ll cover some traditional object-oriented solutions and expose some of the problems in their approach. In so doing, we ll cover a couple of design patterns that can apply to our sample application. However, we ll also see why we can t always rely on them in all situations where maximum flexibility is required. This will lead us to aspect-oriented programming (AOP), which helps us write functionality that is difficult to implement efficiently with pure objectoriented techniques. The Spring Framework provides its own AOP framework called Spring AOP This chapter dis. cusses the classic Spring AOP framework, which is still available in Spring 2.0 and is the AOP framework for versions of the Spring Framework prior to 2.0. This framework has been completely revamped for Spring 2.0, which is discussed in the next chapter. The revamped 2.0 AOP framework borrows a lot of features from the classic AOP framework, so understanding these features is important when using Spring 2.0.
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Extending Applications the Traditional Way
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Applications should be developed with the flexibility for later changes and additions. A sure way to hamper maintenance tasks is to overload applications with complexity and make them hard to configure. Another sure way to hinder maintenance is to overload classes with complexity by giving them more than one responsibility. This makes the code hard to write, test, and understand, and it frustrates the efforts of maintenance developers. Classes that perform more tasks than they should suffer from a lack of abstraction, which makes them generally harder for developers to use. Finally, code that is not properly tested is riskier, since unintended effects caused by changes are less likely to be spotted. Making applications more functional without having to change core business logic is an important part of their maintainability. Changing core application code is really warranted only when the rules of the core business logic change. In all other cases, testing the entire application again for less important changes is often considered too expensive. Getting approval for small changes that would make an application more useful is often postponed until big changes need to be made, reducing the flexibility of the organization that depends on the application to improve its efficiency.
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