"Welcome To Ashok IT"				
			                     "Spring Boot and MicroServices"
                                              Topic : Autowiring
                                              Date  : 18/03/2024
                                                (Session - 06)                               
_____________________________________________________________________________________________________________________________
Today Session : Bean Autowiring
===============================
* Bean wiring is nothing but configuring the dependencies of abean along with bean in xml file.

* If you manually configure bean dependencies into an xml file then the size of xml file will be increased.

* Inorder to cut down the xml configuration the framework has introduced the autowiring facility.

* Incase of autowiring we no need to configure the dependencies explictly in xml file based on autowire strategy the
  container will inject the dependencies of abean automatically.

* Bean autowiring facility is only applicable for "Dependency in the form of Objects".

* To add autowiring facility we need to configure "autowire" attribute with <bean> tag.

* The values of autowire attribute are 
    1) no
    2) byName
    3) byType
    4) constructor
    
* Bean Autowiring facility can be achieved using two approaches
    1) XML Approach
    2) Annotation Approach


Student.java
============
package com.ashokit.spring.beans;

public class Student {
	
	//simple properties
	private String studentId;
	private String name;
	
	//object properties
	private Address address;
	private Course course;

	public void setStudentId(String studentId) {
		this.studentId = studentId;
	}

	public void setName(String name) {
		this.name = name;
	}

	public void setAddress(Address address) {
		this.address = address;
	}
	
	public void setCourse(Course course) {
		this.course = course;
	}

	@Override
	public String toString() {
		return "Student [studentId=" + studentId + ", name=" + name + ", address=" + address + ", course=" + course
				+ "]";
	}	
}

Address.java
============
package com.ashokit.spring.beans;

public class Address {
	
	private String doorNo;
	
	private String cityName;
	
	private String pincode;

	public void setDoorNo(String doorNo) {
		this.doorNo = doorNo;
	}

	public void setCityName(String cityName) {
		this.cityName = cityName;
	}

	public void setPincode(String pincode) {
		this.pincode = pincode;
	}

	@Override
	public String toString() {
		return "Address [doorNo=" + doorNo + ", cityName=" + cityName + ", pincode=" + pincode + "]";
	}
}

Course.java
==========
package com.ashokit.spring.beans;

public class Course {
	
	private String courseId;
	
	private String courseName;
	
	private int courseFee;

	public void setCourseId(String courseId) {
		this.courseId = courseId;
	}

	public void setCourseName(String courseName) {
		this.courseName = courseName;
	}

	public void setCourseFee(int courseFee) {
		this.courseFee = courseFee;
	}

	@Override
	public String toString() {
		return "Course [courseId=" + courseId + ", courseName=" + courseName + ", courseFee=" + courseFee + "]";
	}
}

spring.xml
==========
<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
	xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
	xsi:schemaLocation="http://www.springframework.org/schema/beans
		https://www.springframework.org/schema/beans/spring-beans.xsd">

       <!-- Configuring the Student Bean -->
     <bean id="stu" class="com.ashokit.spring.beans.Student" autowire="byType">
         <property name="studentId" value="AIT123"/>
         <property name="name" value="Mahesh"/>
     </bean>
     
       <!-- Configuring the Address Bean -->
      <bean id="address1" class="com.ashokit.spring.beans.Address">
          <property name="doorNo" value="1-2-3"/>
          <property name="cityName" value="Chennai"/>
          <property name="pincode" value="12324"/>
     </bean>
     
      <!-- Configuring the Address Bean -->
      <bean id="address2" class="com.ashokit.spring.beans.Address" primary="true">
          <property name="doorNo" value="1-2-3"/>
          <property name="cityName" value="Hyderabad"/>
          <property name="pincode" value="123245"/>
     </bean>
     
      <!-- Configuring the Course Bean -->
      <bean id="course1" class="com.ashokit.spring.beans.Course">
          <property name="courseId" value="SBMS"/>
          <property name="courseName" value="SpringBootMicroservices"/>
          <property name="courseFee" value="8000"/>
     </bean>
</beans>

SpringClient.java
=================
package com.ashokit.spring.client;

import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;

import com.ashokit.spring.beans.Student;

public class SpringClient {
	
	public static void main(String[] args) {
		
		ApplicationContext context = new ClassPathXmlApplicationContext("spring.xml");
		
		Student student = (Student)context.getBean("stu");
		System.out.println(student);
		
	}

}