Spring Core

Spring Core

1. Lightweight

   • The basic version of spring is around 2 MB

2. Inversion of Control(IoC)

   • IoC promove the loose coupling, It minimizes the amount of code, it make easy to test application since you dont need JNDI, it uses dependency injection
   • Dependency Injection
     • Is a technique that says that you don't create your object, but you have to describe how they should be created. You don't connect your components but you describe them

3. Container

   • Is the basic Spring module that provide all functionalities to Springs applications
     • BeanFactory
       • Is an implementation of Factory pattern
         • Sirve para construir una jerarquia de clases, encapsular la logica de creacion al cliente, y el cliente trabaja con una referencia
       • ApplicationContext: Is a subinterfaz of bean factory it provides extra functionalities as handle resources and internationalisation
         • Spring Bean
           • they are the objects that form the backbone of your application those objects are handle by the spring container, you configure them for xml, annotations or java configurations
             • Scopes
               • Global session
                 • Return a new instance for global Http session is common in portlets applications
               • Singleton
                 • The container create only one bean and store it in cache and when the application try to get this bean the container return the same instance
               • Prototype
                 • Return a new instance each time it requested
               • Session
                 • Return a new instance per http session
               • Request
                 • Return a new instance each per http request
           • Bean wiring
             • You can wiring beans between them without construct args or properties
               • By Name
               • By Type
               • By contructor
               • Autodetect