Introduction

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Agenda

• What is Spring framework ?
• Spring framework architecture
• Spring Concept
• Spring Message Source

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Spring framework architecture

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Bean

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Basic Bean Creation

						HelloWorld hello = new mypackage.HelloWorld();
						

						<bean id="hello" class="mypackage.HelloWorld"></bean>
						

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Inversion of Control (IoC)

• IoC is a principle that externalizes the creation and management of component dependencies.

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Dependency Inversion Principle (DIP)

"Abstraction"

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public class Email { 
	public void send() {	
	}
}
                

public class Notification {
	Email email;
	public Notification() {
		    email = new Email();
	}
	public void notifyPromotion() {
		    email.send();
	}
 
}                

Violation DIP

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public interface MessageService {
	public void send();
 
}
                

public class Email implements MessageService { 
	public void send() {	
	}
}
                

public class Notification {
	MessageService messageService;
	public Notification() {
		    messageService = new Email();
	}
	public void notifyPromotion() {
		    messageService.send();
	}
 
}            

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Dependency Injection (DI)

• Aims to offer a simpler mechanism for provisioning component dependencies and managing these dependencies throughout their lifecycles.
• "Container" resolves (injects) dependencies of components by setting implementation object (push)

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Th@nk You

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