Spring core v3 x
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Spring core v3.x. Prepared by: Nhan Le. History. Agenda. IoC vs DI IOC Container Validation, Data Binding & Type conversion Spring Expression Language Testing Spring AOP Cache Abstraction. IoC vs DI.

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Spring core v3.x

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Spring core v3.x

Prepared by: Nhan Le


History


Agenda

IoCvs DI

IOC Container

Validation, Data Binding & Type conversion

Spring Expression Language

Testing

Spring AOP

Cache Abstraction


IoCvs DI

Inversion of control is a design principle that it decouplesobjects from specific lookup mechanisms and implementations of the objects it depends on

Dependency injection is a form of IoC, where removes hard-coded dependencies and make it possible to change them at Compile time or Run Time


Advantages of IoC

Reduce coupling

Both constructor and setter dependency injection reduce coupling.

Improves testability

Replace actual object with mock object which improves testability by writing simple JUnit tests which uses mock object.

Flexibility

As side benefit of loose coupling, because of DI you can replace non effective implementation with better one later


Dependencies

  • Dependency Injection

    • Constructor based

    • Setter based

    • Interface Injection

  • Dependency resolution process

  • Circular dependencies


Dependencies

type matching

argument index

argument name


IOC Container

The interface org.springframework.context.ApplicationContext represents the Spring IOC container and is responsible for instantiating, configuring, and assembling the beans by reading configuration metadata

Configuration Metadata

- XML based

- Annotation based

- Java based


IOC – Bean Lifecycle


<bean id="exampleBean" class="examples.ExampleBean"/>

<bean id="exampleBean" class="examples.ExampleBean"/>

IOC – Bean

<bean id="exampleBean" class="examples.ExampleBean"/>

  • Naming beans

    • Id, name and alias

  • Instantiating beans

    • Constructor

    • Static factory

    • Method factory

  • Inner beans

    • Inject able?

    • Scope?


Instantiating Beans

Constructor

Static Factory method

Instance Factory method


Inner Beans

<bean id="exampleBean" class="examples.ExampleBean"/>

  • Can we inject Person class into others than outer class ?

  • Scope of Person class ? Can we change scope ?


IOC – Bean

  • Lifecycle callbacks

    • @PostConstruct& @PreDestroy

    • InitializingBean & DisposableBean

    • Default initialization and destroy methods

  • Callback order


IOC – Bean

Aware interfaces


Testing

UserService{

@Inject private UserDAOuserDao;

......

public booleanauth(String user, String pass){

String encryptedPass = encrypt(pass);

User user = userDao.find(user, encryptedPass);

if (user != null){

return true;

}

return false;

}


Spring Expression Language

● Querying and manipulating an object graph at runtime

● Can be used independently

● Support implementation via

  • API

  • XML

  • Annotation


AOP

● Aspect-Oriented Programming

● Spring AOP

● Schema-based VS @AspectJ annotation type


AOP

Concepts

● Aspect

● Join Point

● Advice

● Pointcut

● Introduction

● Target object

● AOP proxy

● Weaving


AOP

Type of advice

  • Before advice

  • After returning advice

  • After throwing advice

  • After (finally) advice

  • Around advice


AOP

  • Pointcut types (Spring AOP)

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