Spring Offerings: Link to heading

IOC Link to heading

In general, Tight Coupling is bad in but most of the time, because it reduces flexibility and re-usability of code, it makes changes much more difficult, it impedes test ability first level: interface Next level: spring

IoC enables a framework to take control of the flow of a program and make calls to our custom code. The advantages of this architecture are:

  • decoupling the execution of a task from its implementation
  • making it easier to switch between different implementations
  • greater modularity of a program
  • greater ease in testing a program by isolating a component or mocking its dependencies, and allowing components to communicate through contracts

IoC patterns: Strategy design pattern, Service Locator pattern, Factory pattern, and Dependency Injection (DI).

An IoC container is a common characteristic of frameworks that implement IoC

  1. Interface: ApplicationContext is where Spring holds instances of objects that it has identified to be managed and distributed automatically, instantiating, configuring and assembling as well as managing their life cycles. These are called beans.
  2. BeanFactory - simple rarely used

Autowiring - process of wiring dependencies for a spring Bean

@SpringBootApplication is a convenience annotation that is equivalent to declaring three separate annotations @Configuration, @EnableAutoConfiguration, and @ComponentScan with their default attributes. It is typically used on the main class of a Spring Boot application to enable auto-configuration, component scanning, and to define the application context. Before Spring boot, we need to manage using below:

  • @Configuration: Indicates that the class is a source of bean definitions for the application context.

  • @EnableAutoConfiguration: Enables Spring Boot’s auto-configuration mechanism, which automatically configures the application based on the dependencies that are added in the classpath.

  • @ComponentScan: Enables component scanning so that the annotated components are automatically discovered and registered as beans in the application context.

Debugging: Link to heading

Raise debug level for spring framework:
application.properties

logging.level.org.springframework=debug

Keywords Link to heading

IOC, DI, ApplicationContext,

References Link to heading