【06】Spring源码-分析篇-ApplicationContext

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

	<bean id="beanE" class="com.study.spring.sample.config.BeanE" />

	<bean id="beanF" class="com.study.spring.sample.config.BeanF" ></bean>

	<context:annotation-config/>

	<context:component-scan base-package="com.study.spring.sample.config" ></context:component-scan>

</beans>

public class XMLConfigMain {

	public static void main(String[] args) {
		ApplicationContext context = new GenericXmlApplicationContext(
				"classpath:com/study/spring/sample/config/application.xml");
		BeanF bf = context.getBean(BeanF.class);
		bf.do1();
	}
}

@Configuration
@ComponentScan("com.study.spring.sample.config")
public class JavaBasedMain {

	@Bean
	public BeanH getBeanH() {
		return new BeanH();
	}

	public static void main(String[] args) {
		ApplicationContext context = new AnnotationConfigApplicationContext(JavaBasedMain.class);

		BeanH bh = context.getBean(BeanH.class);
		bh.doH();
	}
}

public class AnnotationMain {

	public static void main(String[] args) {
		ApplicationContext context = new AnnotationConfigApplicationContext("com.study.spring.sample.config");

		BeanG bg = context.getBean(BeanG.class);
		bg.dog();
	}
}

	public AnnotationConfigApplicationContext() {
		this.reader = new AnnotatedBeanDefinitionReader(this);
		this.scanner = new ClassPathBeanDefinitionScanner(this);
	}

public interface BeanMetadataElement {

	/**
	 * Return the configuration source {@code Object} for this metadata element
	 * (may be {@code null}).
	 */
	@Nullable
	default Object getSource() {
		return null;
	}

}

public class BeanMetadataAttribute implements BeanMetadataElement {

	private final String name;

	@Nullable
	private final Object value;

	@Nullable
	private Object source;

}

public interface AttributeAccessor {

	/**
	 * Set the attribute defined by {@code name} to the supplied {@code value}.
	 * If {@code value} is {@code null}, the attribute is {@link #removeAttribute removed}.
	 * <p>In general, users should take care to prevent overlaps with other
	 * metadata attributes by using fully-qualified names, perhaps using
	 * class or package names as prefix.
	 * @param name the unique attribute key
	 * @param value the attribute value to be attached
	 */
	void setAttribute(String name, @Nullable Object value);

	/**
	 * Get the value of the attribute identified by {@code name}.
	 * Return {@code null} if the attribute doesn't exist.
	 * @param name the unique attribute key
	 * @return the current value of the attribute, if any
	 */
	@Nullable
	Object getAttribute(String name);

	/**
	 * Remove the attribute identified by {@code name} and return its value.
	 * Return {@code null} if no attribute under {@code name} is found.
	 * @param name the unique attribute key
	 * @return the last value of the attribute, if any
	 */
	@Nullable
	Object removeAttribute(String name);

	/**
	 * Return {@code true} if the attribute identified by {@code name} exists.
	 * Otherwise return {@code false}.
	 * @param name the unique attribute key
	 */
	boolean hasAttribute(String name);

	/**
	 * Return the names of all attributes.
	 */
	String[] attributeNames();

}

public abstract class AttributeAccessorSupport implements AttributeAccessor, Serializable {

	/** Map with String keys and Object values. */
	private final Map<String, Object> attributes = new LinkedHashMap<>();


	@Override
	public void setAttribute(String name, @Nullable Object value) {
		Assert.notNull(name, "Name must not be null");
		if (value != null) {
			this.attributes.put(name, value);
		}
		else {
			removeAttribute(name);
		}
	}
    //  ......
}

public interface AnnotatedBeanDefinition extends BeanDefinition {

	/**
	 * Obtain the annotation metadata (as well as basic class metadata)
	 * for this bean definition's bean class.
	 * @return the annotation metadata object (never {@code null})
	 */
	AnnotationMetadata getMetadata();

	/**
	 * Obtain metadata for this bean definition's factory method, if any.
	 * @return the factory method metadata, or {@code null} if none
	 * @since 4.1.1
	 */
	@Nullable
	MethodMetadata getFactoryMethodMetadata();

}