package com.example.spring;

import org.springframework.context.ApplicationContext;
import org.springframework.context.annotation.AnnotationConfigApplicationContext;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;

@Configuration
public class App {

	public static void main(String[] args) {
		@SuppressWarnings("resource")
		ApplicationContext ctx = new AnnotationConfigApplicationContext(App.class);

		MathsUser mathsUser = ctx.getBean(MathsUser.class);

		mathsUser.doTask();
	}

	@Bean
	public Maths maths() {
		Maths maths = new Maths();
		maths.setB(100);

		return maths;
	}

	@Bean
	public MathsUser mathsUser() {
		MathsUser mathsUser = new MathsUser();

		/*
		 * What would the maths() return? Would it be the Spring managed bean or what
		 * would be returned when the maths() method is directly invoked?
		 * 
		 * @Bean can be used with classes annotated with @Component tool.
		 * 
		 * In a class annotated with @Configuration, maths() return the Spring managed bean.
		 *  
		 * In a class annotated with @Component, what is returned by maths() is not the
		 * Spring managed bean, but what would be returned when the maths() method is directly invoked.
		 * 
		 * For more details, look at the 'Full @Configuration vs “lite” @Bean mode?' description
		 * found in the 'Core Technologies' section of the Spring Framework Reference documentation.  
		 */
		mathsUser.setMaths(maths());

		return mathsUser;
	}
}