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By Mehdi Khosrow-Pour (Editor)

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Creating an ApplicationContext The important concept to understand is that Spring’s job is to parse your configuration files and then instantiate your managed classes, resolving their interdependencies. Spring is often called a container, since it is designed to create and manage all the dependencies within your application, serving as a foundation and context through which beans may also be looked up. This core engine is represented by a base interface called BeanFactory. The BeanFactory defines the core Spring engine that conglomerates your beans and wires the collaborating dependencies together.

Singleton beans guarantee that there can only ever be a single instance of your class in the entire Spring ApplicationContext. Spring 2 offers several powerful new scopes, including request and session (which ties a bean’s life cycle to an active servlet request or session, respectively), as well as the ability to roll your own. 38 Spring Persistence — A Running Start Integrating a Database Now that you have a clearer picture of how Spring is bootstrapped within your application, let’s get back to integrating our database of choice.

The typical singleton meets the following criteria: Spring Persistence: A Running Start 37 ƒ Has a static method to return the single instance of the class (stored as a static reference within the class) ƒ Has a private constructor, ensuring that only the singleton itself can ever create a new instance (which is your assurance that you won’t accidentally create more than once instance, simply by invoking new MySingleton()) So, a singleton in your application might resemble the following: class MySingleton { private static MySingleton instance; private MySingleton() { } public static MySingleton getInstance() { return instance; } } Although the preceding sample illustrates a useful design pattern, Spring obviates the need to write this boilerplate code, once again allowing you to move these details into the configuration.

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Advanced Topics in Information Resources Management , Vol 3 by Mehdi Khosrow-Pour (Editor)

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