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第 09 章：虎行有雨，定义标记类型Aware接口，实现感知容器对象

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浏览文件 @ 7795ca52
Apache License
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small-spring-step-08/pom.xml 0 → 100755
浏览文件 @ 7795ca52
<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<groupId>cn.bugstack.springframework</groupId>
<artifactId>small-spring-step-08</artifactId>
<version>1.0-SNAPSHOT</version>
<packaging>jar</packaging>
<properties>
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
<project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
</properties>
<name>small-spring-step-08</name>
<description>
small spring is easy study Spring！
</description>
<url>https://github.com/fuzhengwei/small-spring</url>
<developers>
<developer>
<id>small-spring</id>
<name>小傅哥</name>
<email>184172133@qq.com</email>
</developer>
</developers>
<licenses>
<license>
<name>The MIT License</name>
<distribution>repo</distribution>
</license>
</licenses>
<dependencies>
<!-- https://mvnrepository.com/artifact/cglib/cglib -->
<dependency>
<groupId>cglib</groupId>
<artifactId>cglib</artifactId>
<version>3.3.0</version>
</dependency>
<dependency>
<groupId>cn.hutool</groupId>
<artifactId>hutool-all</artifactId>
<version>5.5.0</version>
</dependency>
<dependency>
<groupId>junit</groupId>
<artifactId>junit</artifactId>
<version>4.7</version>
<scope>test</scope>
</dependency>
</dependencies>
<build>
<plugins>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-compiler-plugin</artifactId>
<version>3.1</version>
<configuration>
<source>1.8</source>
<target>1.8</target>
<encoding>UTF-8</encoding>
</configuration>
</plugin>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-resources-plugin</artifactId>
<version>2.6</version>
<configuration>
<encoding>UTF-8</encoding>
</configuration>
</plugin>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-source-plugin</artifactId>
<version>2.2.1</version>
<executions>
<execution>
<id>attach-sources</id>
<goals>
<goal>jar</goal>
</goals>
</execution>
</executions>
</plugin>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-javadoc-plugin</artifactId>
<version>2.9.1</version>
<configuration>
<encoding>UTF-8</encoding>
</configuration>
<executions>
<execution>
<id>attach-javadocs</id>
<goals>
<goal>jar</goal>
</goals>
</execution>
</executions>
</plugin>
</plugins>
</build>
</project>
\ No newline at end of file
small-spring-step-08/src/main/java/cn/bugstack/springframework/beans/BeansException.java 0 → 100755
浏览文件 @ 7795ca52
package cn.bugstack.springframework.beans;
/**
* 博客：https://bugstack.cn - 沉淀、分享、成长，让自己和他人都能有所收获！
* 公众号：bugstack虫洞栈
* Create by 小傅哥(fustack)
*/
public class BeansException extends RuntimeException {
public BeansException(String msg) {
super(msg);
}
public BeansException(String msg, Throwable cause) {
super(msg, cause);
}
}
small-spring-step-08/src/main/java/cn/bugstack/springframework/beans/PropertyValue.java 0 → 100755
浏览文件 @ 7795ca52
package cn.bugstack.springframework.beans;
/**
* 博客：https://bugstack.cn - 沉淀、分享、成长，让自己和他人都能有所收获！
* 公众号：bugstack虫洞栈
* Create by 小傅哥(fustack)
*
* bean 属性信息
*/
public class PropertyValue {
private final String name;
private final Object value;
public PropertyValue(String name, Object value) {
this.name = name;
this.value = value;
}
public String getName() {
return name;
}
public Object getValue() {
return value;
}
}
small-spring-step-08/src/main/java/cn/bugstack/springframework/beans/PropertyValues.java 0 → 100755
浏览文件 @ 7795ca52
package cn.bugstack.springframework.beans;
import java.util.ArrayList;
import java.util.List;
/**
* 博客：https://bugstack.cn - 沉淀、分享、成长，让自己和他人都能有所收获！
* 公众号：bugstack虫洞栈
* Create by 小傅哥(fustack)
*/
public class PropertyValues {
private final List<PropertyValue> propertyValueList = new ArrayList<>();
public void addPropertyValue(PropertyValue pv) {
this.propertyValueList.add(pv);
}
public PropertyValue[] getPropertyValues() {
return this.propertyValueList.toArray(new PropertyValue[0]);
}
public PropertyValue getPropertyValue(String propertyName) {
for (PropertyValue pv : this.propertyValueList) {
if (pv.getName().equals(propertyName)) {
return pv;
}
}
return null;
}
}
small-spring-step-08/src/main/java/cn/bugstack/springframework/beans/factory/Aware.java 0 → 100755
浏览文件 @ 7795ca52
package cn.bugstack.springframework.beans.factory;
/**
* Marker superinterface indicating that a bean is eligible to be
* notified by the Spring container of a particular framework object
* through a callback-style method. Actual method signature is
* determined by individual subinterfaces, but should typically
* consist of just one void-returning method that accepts a single
* argument.
*
* 标记类接口，实现该接口可以被Spring容器感知
*
* 博客：https://bugstack.cn - 沉淀、分享、成长，让自己和他人都能有所收获！
* 公众号：bugstack虫洞栈
* Create by 小傅哥(fustack)
*/
public interface Aware {
}
\ No newline at end of file
small-spring-step-08/src/main/java/cn/bugstack/springframework/beans/factory/BeanClassLoaderAware.java 0 → 100755
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package cn.bugstack.springframework.beans.factory;
/**
* Callback that allows a bean to be aware of the bean
* {@link ClassLoader class loader}; that is, the class loader used by the
* present bean factory to load bean classes.
*
* 博客：https://bugstack.cn - 沉淀、分享、成长，让自己和他人都能有所收获！
* 公众号：bugstack虫洞栈
* Create by 小傅哥(fustack)
*/
public interface BeanClassLoaderAware extends Aware{
void setBeanClassLoader(ClassLoader classLoader);
}
\ No newline at end of file
small-spring-step-08/src/main/java/cn/bugstack/springframework/beans/factory/BeanFactory.java 0 → 100755
浏览文件 @ 7795ca52
package cn.bugstack.springframework.beans.factory;
import cn.bugstack.springframework.beans.BeansException;
/**
* 博客：https://bugstack.cn - 沉淀、分享、成长，让自己和他人都能有所收获！
* 公众号：bugstack虫洞栈
* Create by 小傅哥(fustack)
*/
public interface BeanFactory {
Object getBean(String name) throws BeansException;
Object getBean(String name, Object... args) throws BeansException;
<T> T getBean(String name, Class<T> requiredType) throws BeansException;
}
small-spring-step-08/src/main/java/cn/bugstack/springframework/beans/factory/BeanFactoryAware.java 0 → 100755
浏览文件 @ 7795ca52
package cn.bugstack.springframework.beans.factory;
import cn.bugstack.springframework.beans.BeansException;
/**
* Interface to be implemented by beans that wish to be aware of their
* owning {@link BeanFactory}.
*
* 实现此接口，既能感知到所属的 BeanFactory
*
* 博客：https://bugstack.cn - 沉淀、分享、成长，让自己和他人都能有所收获！
* 公众号：bugstack虫洞栈
* Create by 小傅哥(fustack)
*/
public interface BeanFactoryAware extends Aware {
void setBeanFactory(BeanFactory beanFactory) throws BeansException;
}
small-spring-step-08/src/main/java/cn/bugstack/springframework/beans/factory/BeanNameAware.java 0 → 100755
浏览文件 @ 7795ca52
package cn.bugstack.springframework.beans.factory;
/**
* Interface to be implemented by beans that want to be aware of their
* bean name in a bean factory. Note that it is not usually recommended
* that an object depend on its bean name, as this represents a potentially
* brittle dependence on external configuration, as well as a possibly
* unnecessary dependence on a Spring API.
*
* 博客：https://bugstack.cn - 沉淀、分享、成长，让自己和他人都能有所收获！
* 公众号：bugstack虫洞栈
* Create by 小傅哥(fustack)
*/
public interface BeanNameAware extends Aware {
void setBeanName(String name);
}
small-spring-step-08/src/main/java/cn/bugstack/springframework/beans/factory/ConfigurableListableBeanFactory.java 0 → 100755
浏览文件 @ 7795ca52
package cn.bugstack.springframework.beans.factory;
import cn.bugstack.springframework.beans.BeansException;
import cn.bugstack.springframework.beans.factory.config.AutowireCapableBeanFactory;
import cn.bugstack.springframework.beans.factory.config.BeanDefinition;
import cn.bugstack.springframework.beans.factory.config.BeanPostProcessor;
import cn.bugstack.springframework.beans.factory.config.ConfigurableBeanFactory;
/**
* Configuration interface to be implemented by most listable bean factories.
* In addition to {@link ConfigurableBeanFactory}, it provides facilities to
* analyze and modify bean definitions, and to pre-instantiate singletons.
*
* 博客：https://bugstack.cn - 沉淀、分享、成长，让自己和他人都能有所收获！
* 公众号：bugstack虫洞栈
* Create by 小傅哥(fustack)
*/
public interface ConfigurableListableBeanFactory extends ListableBeanFactory, AutowireCapableBeanFactory, ConfigurableBeanFactory {
BeanDefinition getBeanDefinition(String beanName) throws BeansException;
void preInstantiateSingletons() throws BeansException;
void addBeanPostProcessor(BeanPostProcessor beanPostProcessor);
}
small-spring-step-08/src/main/java/cn/bugstack/springframework/beans/factory/DisposableBean.java 0 → 100755
浏览文件 @ 7795ca52
package cn.bugstack.springframework.beans.factory;
/**
* Interface to be implemented by beans that want to release resources
* on destruction. A BeanFactory is supposed to invoke the destroy
* method if it disposes a cached singleton. An application context
* is supposed to dispose all of its singletons on close.
*
* 博客：https://bugstack.cn - 沉淀、分享、成长，让自己和他人都能有所收获！
* 公众号：bugstack虫洞栈
* Create by 小傅哥(fustack)
*/
public interface DisposableBean {
void destroy() throws Exception;
}
small-spring-step-08/src/main/java/cn/bugstack/springframework/beans/factory/HierarchicalBeanFactory.java 0 → 100755
浏览文件 @ 7795ca52
package cn.bugstack.springframework.beans.factory;
/**
* Sub-interface implemented by bean factories that can be part
* of a hierarchy.
*/
public interface HierarchicalBeanFactory extends BeanFactory {
}
small-spring-step-08/src/main/java/cn/bugstack/springframework/beans/factory/InitializingBean.java 0 → 100755
浏览文件 @ 7795ca52
package cn.bugstack.springframework.beans.factory;
/**
* Interface to be implemented by beans that need to react once all their
* properties have been set by a BeanFactory: for example, to perform custom
* initialization, or merely to check that all mandatory properties have been set.
*
* 实现此接口的 Bean 对象，会在 BeanFactory 设置属性后作出相应的处理，如：执行自定义初始化，或者仅仅检查是否设置了所有强制属性。
*
* 博客：https://bugstack.cn - 沉淀、分享、成长，让自己和他人都能有所收获！
* 公众号：bugstack虫洞栈
* Create by 小傅哥(fustack)
*/
public interface InitializingBean {
/**
* Bean 处理了属性填充后调用
*
* @throws Exception
*/
void afterPropertiesSet() throws Exception;
}
small-spring-step-08/src/main/java/cn/bugstack/springframework/beans/factory/ListableBeanFactory.java 0 → 100755
浏览文件 @ 7795ca52
package cn.bugstack.springframework.beans.factory;
import cn.bugstack.springframework.beans.BeansException;
import java.util.Map;
/**
* Extension of the {@link BeanFactory} interface to be implemented by bean factories
* that can enumerate all their bean instances, rather than attempting bean lookup
* by name one by one as requested by clients. BeanFactory implementations that
* preload all their bean definitions (such as XML-based factories) may implement
* this interface.
* <p>
* 博客：https://bugstack.cn - 沉淀、分享、成长，让自己和他人都能有所收获！
* 公众号：bugstack虫洞栈
* Create by 小傅哥(fustack)
*/
public interface ListableBeanFactory extends BeanFactory{
/**
* 按照类型返回 Bean 实例
* @param type
* @param <T>
* @return
* @throws BeansException
*/
<T> Map<String, T> getBeansOfType(Class<T> type) throws BeansException;
/**
* Return the names of all beans defined in this registry.
*
* 返回注册表中所有的Bean名称
*/
String[] getBeanDefinitionNames();
}
small-spring-step-08/src/main/java/cn/bugstack/springframework/beans/factory/config/AutowireCapableBeanFactory.java 0 → 100755
浏览文件 @ 7795ca52
package cn.bugstack.springframework.beans.factory.config;
import cn.bugstack.springframework.beans.BeansException;
import cn.bugstack.springframework.beans.factory.BeanFactory;
/**
* Extension of the {@link cn.bugstack.springframework.beans.factory.BeanFactory}
* interface to be implemented by bean factories that are capable of
* autowiring, provided that they want to expose this functionality for
* existing bean instances.
*/
public interface AutowireCapableBeanFactory extends BeanFactory {
/**
* 执行 BeanPostProcessors 接口实现类的 postProcessBeforeInitialization 方法
*
* @param existingBean
* @param beanName
* @return
* @throws BeansException
*/
Object applyBeanPostProcessorsBeforeInitialization(Object existingBean, String beanName) throws BeansException;
/**
* 执行 BeanPostProcessors 接口实现类的 postProcessorsAfterInitialization 方法
*
* @param existingBean
* @param beanName
* @return
* @throws BeansException
*/
Object applyBeanPostProcessorsAfterInitialization(Object existingBean, String beanName) throws BeansException;
}
small-spring-step-08/src/main/java/cn/bugstack/springframework/beans/factory/config/BeanDefinition.java 0 → 100755
浏览文件 @ 7795ca52
package cn.bugstack.springframework.beans.factory.config;
import cn.bugstack.springframework.beans.PropertyValues;
/**
* 博客：https://bugstack.cn - 沉淀、分享、成长，让自己和他人都能有所收获！
* 公众号：bugstack虫洞栈
* Create by 小傅哥(fustack)
*/
public class BeanDefinition {
private Class beanClass;
private PropertyValues propertyValues;
private String initMethodName;
private String destroyMethodName;
public BeanDefinition(Class beanClass) {
this.beanClass = beanClass;
this.propertyValues = new PropertyValues();
}
public BeanDefinition(Class beanClass, PropertyValues propertyValues) {
this.beanClass = beanClass;
this.propertyValues = propertyValues != null ? propertyValues : new PropertyValues();
}
public Class getBeanClass() {
return beanClass;
}
public void setBeanClass(Class beanClass) {
this.beanClass = beanClass;
}
public PropertyValues getPropertyValues() {
return propertyValues;
}
public void setPropertyValues(PropertyValues propertyValues) {
this.propertyValues = propertyValues;
}
public String getInitMethodName() {
return initMethodName;
}
public void setInitMethodName(String initMethodName) {
this.initMethodName = initMethodName;
}
public String getDestroyMethodName() {
return destroyMethodName;
}
public void setDestroyMethodName(String destroyMethodName) {
this.destroyMethodName = destroyMethodName;
}
}
small-spring-step-08/src/main/java/cn/bugstack/springframework/beans/factory/config/BeanFactoryPostProcessor.java 0 → 100755
浏览文件 @ 7795ca52
package cn.bugstack.springframework.beans.factory.config;
import cn.bugstack.springframework.beans.BeansException;
import cn.bugstack.springframework.beans.factory.ConfigurableListableBeanFactory;
/**
* Allows for custom modification of an application context's bean definitions,
* adapting the bean property values of the context's underlying bean factory.
*
* 允许自定义修改 BeanDefinition 属性信息
*
* 博客：https://bugstack.cn - 沉淀、分享、成长，让自己和他人都能有所收获！
* 公众号：bugstack虫洞栈
* Create by 小傅哥(fustack)
*/
public interface BeanFactoryPostProcessor {
/**
* 在所有的 BeanDefinition 加载完成后，实例化 Bean 对象之前，提供修改 BeanDefinition 属性的机制
*
* @param beanFactory
* @throws BeansException
*/
void postProcessBeanFactory(ConfigurableListableBeanFactory beanFactory) throws BeansException;
}
small-spring-step-08/src/main/java/cn/bugstack/springframework/beans/factory/config/BeanPostProcessor.java 0 → 100755
浏览文件 @ 7795ca52
package cn.bugstack.springframework.beans.factory.config;
import cn.bugstack.springframework.beans.BeansException;
/**
* Factory hook that allows for custom modification of new bean instances,
* e.g. checking for marker interfaces or wrapping them with proxies.
*
* 用于修改新实例化 Bean 对象的扩展点
*
* 博客：https://bugstack.cn - 沉淀、分享、成长，让自己和他人都能有所收获！
* 公众号：bugstack虫洞栈
* Create by 小傅哥(fustack)
*/
public interface BeanPostProcessor {
/**
* 在 Bean 对象执行初始化方法之前，执行此方法
*
* @param bean
* @param beanName
* @return
* @throws BeansException
*/
Object postProcessBeforeInitialization(Object bean, String beanName) throws BeansException;
/**
* 在 Bean 对象执行初始化方法之后，执行此方法
*
* @param bean
* @param beanName
* @return
* @throws BeansException
*/
Object postProcessAfterInitialization(Object bean, String beanName) throws BeansException;
}
small-spring-step-08/src/main/java/cn/bugstack/springframework/beans/factory/config/BeanReference.java 0 → 100755
浏览文件 @ 7795ca52
package cn.bugstack.springframework.beans.factory.config;
/**
* 博客：https://bugstack.cn - 沉淀、分享、成长，让自己和他人都能有所收获！
* 公众号：bugstack虫洞栈
* Create by 小傅哥(fustack)
*
* Bean 的引用
*/
public class BeanReference {
private final String beanName;
public BeanReference(String beanName) {
this.beanName = beanName;
}
public String getBeanName() {
return beanName;
}
}
small-spring-step-08/src/main/java/cn/bugstack/springframework/beans/factory/config/ConfigurableBeanFactory.java 0 → 100755
浏览文件 @ 7795ca52
package cn.bugstack.springframework.beans.factory.config;
import cn.bugstack.springframework.beans.factory.HierarchicalBeanFactory;
/**
* Configuration interface to be implemented by most bean factories. Provides
* facilities to configure a bean factory, in addition to the bean factory
* client methods in the {@link cn.bugstack.springframework.beans.factory.BeanFactory}
* interface.
*/
public interface ConfigurableBeanFactory extends HierarchicalBeanFactory, SingletonBeanRegistry {
String SCOPE_SINGLETON = "singleton";
String SCOPE_PROTOTYPE = "prototype";
void addBeanPostProcessor(BeanPostProcessor beanPostProcessor);
/**
* 销毁单例对象
*/
void destroySingletons();
}
small-spring-step-08/src/main/java/cn/bugstack/springframework/beans/factory/config/SingletonBeanRegistry.java 0 → 100755
浏览文件 @ 7795ca52
package cn.bugstack.springframework.beans.factory.config;
/**
* 博客：https://bugstack.cn - 沉淀、分享、成长，让自己和他人都能有所收获！
* 公众号：bugstack虫洞栈
* Create by 小傅哥(fustack)
*
* 单例注册表
*/
public interface SingletonBeanRegistry {
Object getSingleton(String beanName);
}
\ No newline at end of file
small-spring-step-08/src/main/java/cn/bugstack/springframework/beans/factory/support/AbstractAutowireCapableBeanFactory.java 0 → 100755
浏览文件 @ 7795ca52
package cn.bugstack.springframework.beans.factory.support;
import cn.bugstack.springframework.beans.BeansException;
import cn.bugstack.springframework.beans.PropertyValue;
import cn.bugstack.springframework.beans.PropertyValues;
import cn.bugstack.springframework.beans.factory.*;
import cn.bugstack.springframework.beans.factory.config.AutowireCapableBeanFactory;
import cn.bugstack.springframework.beans.factory.config.BeanDefinition;
import cn.bugstack.springframework.beans.factory.config.BeanPostProcessor;
import cn.bugstack.springframework.beans.factory.config.BeanReference;
import cn.bugstack.springframework.context.ApplicationContextAware;
import cn.hutool.core.bean.BeanUtil;
import cn.hutool.core.util.StrUtil;
import java.lang.reflect.Constructor;
import java.lang.reflect.Method;
/**
* Abstract bean factory superclass that implements default bean creation,
* with the full capabilities specified by the class.
* Implements the {@link cn.bugstack.springframework.beans.factory.config.AutowireCapableBeanFactory}
* interface in addition to AbstractBeanFactory's {@link #createBean} method.
* <p>
* 博客：https://bugstack.cn - 沉淀、分享、成长，让自己和他人都能有所收获！
* 公众号：bugstack虫洞栈
* Create by 小傅哥(fustack)
*/
public abstract class AbstractAutowireCapableBeanFactory extends AbstractBeanFactory implements AutowireCapableBeanFactory {
private InstantiationStrategy instantiationStrategy = new CglibSubclassingInstantiationStrategy();
@Override
protected Object createBean(String beanName, BeanDefinition beanDefinition, Object[] args) throws BeansException {
Object bean = null;
try {
bean = createBeanInstance(beanDefinition, beanName, args);
// 给 Bean 填充属性
applyPropertyValues(beanName, bean, beanDefinition);
// 执行 Bean 的初始化方法和 BeanPostProcessor 的前置和后置处理方法
bean = initializeBean(beanName, bean, beanDefinition);
} catch (Exception e) {
throw new BeansException("Instantiation of bean failed", e);
}
// 注册实现了 DisposableBean 接口的 Bean 对象
registerDisposableBeanIfNecessary(beanName, bean, beanDefinition);
addSingleton(beanName, bean);
return bean;
}
protected void registerDisposableBeanIfNecessary(String beanName, Object bean, BeanDefinition beanDefinition) {
if (bean instanceof DisposableBean || StrUtil.isNotEmpty(beanDefinition.getDestroyMethodName())) {
registerDisposableBean(beanName, new DisposableBeanAdapter(bean, beanName, beanDefinition));
}
}
protected Object createBeanInstance(BeanDefinition beanDefinition, String beanName, Object[] args) {
Constructor constructorToUse = null;
Class<?> beanClass = beanDefinition.getBeanClass();
Constructor<?>[] declaredConstructors = beanClass.getDeclaredConstructors();
for (Constructor ctor : declaredConstructors) {
if (null != args && ctor.getParameterTypes().length == args.length) {
constructorToUse = ctor;
break;
}
}
return getInstantiationStrategy().instantiate(beanDefinition, beanName, constructorToUse, args);
}
/**
* Bean 属性填充
*/
protected void applyPropertyValues(String beanName, Object bean, BeanDefinition beanDefinition) {
try {
PropertyValues propertyValues = beanDefinition.getPropertyValues();
for (PropertyValue propertyValue : propertyValues.getPropertyValues()) {
String name = propertyValue.getName();
Object value = propertyValue.getValue();
if (value instanceof BeanReference) {
// A 依赖 B，获取 B 的实例化
BeanReference beanReference = (BeanReference) value;
value = getBean(beanReference.getBeanName());
}
// 属性填充
BeanUtil.setFieldValue(bean, name, value);
}
} catch (Exception e) {
throw new BeansException("Error setting property values：" + beanName);
}
}
public InstantiationStrategy getInstantiationStrategy() {
return instantiationStrategy;
}
public void setInstantiationStrategy(InstantiationStrategy instantiationStrategy) {
this.instantiationStrategy = instantiationStrategy;
}
private Object initializeBean(String beanName, Object bean, BeanDefinition beanDefinition) {
// invokeAwareMethods
if (bean instanceof Aware) {
if (bean instanceof BeanFactoryAware) {
((BeanFactoryAware) bean).setBeanFactory(this);
}
if (bean instanceof BeanClassLoaderAware){
((BeanClassLoaderAware) bean).setBeanClassLoader(getBeanClassLoader());
}
if (bean instanceof BeanNameAware) {
((BeanNameAware) bean).setBeanName(beanName);
}
}
// 1. 执行 BeanPostProcessor Before 处理
Object wrappedBean = applyBeanPostProcessorsBeforeInitialization(bean, beanName);
// 执行 Bean 对象的初始化方法
try {
invokeInitMethods(beanName, wrappedBean, beanDefinition);
} catch (Exception e) {
throw new BeansException("Invocation of init method of bean[" + beanName + "] failed", e);
}
// 2. 执行 BeanPostProcessor After 处理
wrappedBean = applyBeanPostProcessorsAfterInitialization(bean, beanName);
return wrappedBean;
}
private void invokeInitMethods(String beanName, Object bean, BeanDefinition beanDefinition) throws Exception {
// 1. 实现接口 InitializingBean
if (bean instanceof InitializingBean) {
((InitializingBean) bean).afterPropertiesSet();
}
// 2. 注解配置 init-method {判断是为了避免二次执行销毁}
String initMethodName = beanDefinition.getInitMethodName();
if (StrUtil.isNotEmpty(initMethodName)) {
Method initMethod = beanDefinition.getBeanClass().getMethod(initMethodName);
if (null == initMethod) {
throw new BeansException("Could not find an init method named '" + initMethodName + "' on bean with name '" + beanName + "'");
}
initMethod.invoke(bean);
}
}
@Override
public Object applyBeanPostProcessorsBeforeInitialization(Object existingBean, String beanName) throws BeansException {
Object result = existingBean;
for (BeanPostProcessor processor : getBeanPostProcessors()) {
Object current = processor.postProcessBeforeInitialization(result, beanName);
if (null == current) return result;
result = current;
}
return result;
}
@Override
public Object applyBeanPostProcessorsAfterInitialization(Object existingBean, String beanName) throws BeansException {
Object result = existingBean;
for (BeanPostProcessor processor : getBeanPostProcessors()) {
Object current = processor.postProcessAfterInitialization(result, beanName);
if (null == current) return result;
result = current;
}
return result;
}
}
small-spring-step-08/src/main/java/cn/bugstack/springframework/beans/factory/support/AbstractBeanDefinitionReader.java 0 → 100755
浏览文件 @ 7795ca52
package cn.bugstack.springframework.beans.factory.support;
import cn.bugstack.springframework.beans.BeansException;
import cn.bugstack.springframework.core.io.DefaultResourceLoader;
import cn.bugstack.springframework.core.io.ResourceLoader;
/**
* Abstract base class for bean definition readers which implement
* the {@link BeanDefinitionReader} interface.
* <p>
* 博客：https://bugstack.cn - 沉淀、分享、成长，让自己和他人都能有所收获！
* 公众号：bugstack虫洞栈
* Create by 小傅哥(fustack)
*/
public abstract class AbstractBeanDefinitionReader implements BeanDefinitionReader {
private final BeanDefinitionRegistry registry;
private ResourceLoader resourceLoader;
protected AbstractBeanDefinitionReader(BeanDefinitionRegistry registry) {
this(registry, new DefaultResourceLoader());
}
public AbstractBeanDefinitionReader(BeanDefinitionRegistry registry, ResourceLoader resourceLoader) {
this.registry = registry;
this.resourceLoader = resourceLoader;
}
@Override
public BeanDefinitionRegistry getRegistry() {
return registry;
}
@Override
public ResourceLoader getResourceLoader() {
return resourceLoader;
}
}
small-spring-step-08/src/main/java/cn/bugstack/springframework/beans/factory/support/AbstractBeanFactory.java 0 → 100755
浏览文件 @ 7795ca52
package cn.bugstack.springframework.beans.factory.support;
import cn.bugstack.springframework.beans.BeansException;
import cn.bugstack.springframework.beans.factory.BeanFactory;
import cn.bugstack.springframework.beans.factory.config.BeanDefinition;
import cn.bugstack.springframework.beans.factory.config.BeanPostProcessor;
import cn.bugstack.springframework.beans.factory.config.ConfigurableBeanFactory;
import cn.bugstack.springframework.util.ClassUtils;
import java.util.ArrayList;
import java.util.List;
/**
* 博客：https://bugstack.cn - 沉淀、分享、成长，让自己和他人都能有所收获！
* 公众号：bugstack虫洞栈
* Create by 小傅哥(fustack)
* <p>
* BeanDefinition注册表接口
*/
public abstract class AbstractBeanFactory extends DefaultSingletonBeanRegistry implements ConfigurableBeanFactory {
/** ClassLoader to resolve bean class names with, if necessary */
private ClassLoader beanClassLoader = ClassUtils.getDefaultClassLoader();
/** BeanPostProcessors to apply in createBean */
private final List<BeanPostProcessor> beanPostProcessors = new ArrayList<BeanPostProcessor>();
@Override
public Object getBean(String name) throws BeansException {
return doGetBean(name, null);
}
@Override
public Object getBean(String name, Object... args) throws BeansException {
return doGetBean(name, args);
}
@Override
public <T> T getBean(String name, Class<T> requiredType) throws BeansException {
return (T) getBean(name);
}
protected <T> T doGetBean(final String name, final Object[] args) {
Object bean = getSingleton(name);
if (bean != null) {
return (T) bean;
}
BeanDefinition beanDefinition = getBeanDefinition(name);
return (T) createBean(name, beanDefinition, args);
}
protected abstract BeanDefinition getBeanDefinition(String beanName) throws BeansException;
protected abstract Object createBean(String beanName, BeanDefinition beanDefinition, Object[] args) throws BeansException;
@Override
public void addBeanPostProcessor(BeanPostProcessor beanPostProcessor){
this.beanPostProcessors.remove(beanPostProcessor);
this.beanPostProcessors.add(beanPostProcessor);
}
/**
* Return the list of BeanPostProcessors that will get applied
* to beans created with this factory.
*/
public List<BeanPostProcessor> getBeanPostProcessors() {
return this.beanPostProcessors;
}
public ClassLoader getBeanClassLoader() {
return this.beanClassLoader;
}
}
small-spring-step-08/src/main/java/cn/bugstack/springframework/beans/factory/support/BeanDefinitionReader.java 0 → 100755
浏览文件 @ 7795ca52
package cn.bugstack.springframework.beans.factory.support;
import cn.bugstack.springframework.beans.BeansException;
import cn.bugstack.springframework.core.io.Resource;
import cn.bugstack.springframework.core.io.ResourceLoader;
/**
* Simple interface for bean definition readers.
*
* 博客：https://bugstack.cn - 沉淀、分享、成长，让自己和他人都能有所收获！
* 公众号：bugstack虫洞栈
* Create by 小傅哥(fustack)
*/
public interface BeanDefinitionReader {
BeanDefinitionRegistry getRegistry();
ResourceLoader getResourceLoader();
void loadBeanDefinitions(Resource resource) throws BeansException;
void loadBeanDefinitions(Resource... resources) throws BeansException;
void loadBeanDefinitions(String location) throws BeansException;
void loadBeanDefinitions(String... locations) throws BeansException;
}
small-spring-step-08/src/main/java/cn/bugstack/springframework/beans/factory/support/BeanDefinitionRegistry.java 0 → 100755
浏览文件 @ 7795ca52
package cn.bugstack.springframework.beans.factory.support;
import cn.bugstack.springframework.beans.BeansException;
import cn.bugstack.springframework.beans.factory.config.BeanDefinition;
/**
* 博客：https://bugstack.cn - 沉淀、分享、成长，让自己和他人都能有所收获！
* 公众号：bugstack虫洞栈
* Create by 小傅哥(fustack)
*/
public interface BeanDefinitionRegistry {
/**
* 向注册表中注册 BeanDefinition
*
* @param beanName
* @param beanDefinition
*/
void registerBeanDefinition(String beanName, BeanDefinition beanDefinition);
/**
* 使用Bean名称查询BeanDefinition
*
* @param beanName
* @return
* @throws BeansException
*/
BeanDefinition getBeanDefinition(String beanName) throws BeansException;
/**
* 判断是否包含指定名称的BeanDefinition
* @param beanName
* @return
*/
boolean containsBeanDefinition(String beanName);
/**
* Return the names of all beans defined in this registry.
*
* 返回注册表中所有的Bean名称
*/
String[] getBeanDefinitionNames();
}
small-spring-step-08/src/main/java/cn/bugstack/springframework/beans/factory/support/CglibSubclassingInstantiationStrategy.java 0 → 100755
浏览文件 @ 7795ca52
package cn.bugstack.springframework.beans.factory.support;
import cn.bugstack.springframework.beans.BeansException;
import cn.bugstack.springframework.beans.factory.config.BeanDefinition;
import net.sf.cglib.proxy.Enhancer;
import net.sf.cglib.proxy.NoOp;
import java.lang.reflect.Constructor;
public class CglibSubclassingInstantiationStrategy implements InstantiationStrategy {
@Override
public Object instantiate(BeanDefinition beanDefinition, String beanName, Constructor ctor, Object[] args) throws BeansException {
Enhancer enhancer = new Enhancer();
enhancer.setSuperclass(beanDefinition.getBeanClass());
enhancer.setCallback(new NoOp() {
@Override
public int hashCode() {
return super.hashCode();
}
});
if (null == ctor) return enhancer.create();
return enhancer.create(ctor.getParameterTypes(), args);
}
}
small-spring-step-08/src/main/java/cn/bugstack/springframework/beans/factory/support/DefaultListableBeanFactory.java 0 → 100755
浏览文件 @ 7795ca52
package cn.bugstack.springframework.beans.factory.support;
import cn.bugstack.springframework.beans.BeansException;
import cn.bugstack.springframework.beans.factory.ConfigurableListableBeanFactory;
import cn.bugstack.springframework.beans.factory.config.BeanDefinition;
import cn.bugstack.springframework.beans.factory.config.ConfigurableBeanFactory;
import java.util.Arrays;
import java.util.HashMap;
import java.util.Map;
import java.util.concurrent.ConcurrentHashMap;
/**
* 博客：https://bugstack.cn - 沉淀、分享、成长，让自己和他人都能有所收获！
* 公众号：bugstack虫洞栈
* Create by 小傅哥(fustack)
*/
public class DefaultListableBeanFactory extends AbstractAutowireCapableBeanFactory implements BeanDefinitionRegistry, ConfigurableListableBeanFactory {
private Map<String, BeanDefinition> beanDefinitionMap = new ConcurrentHashMap<>();
@Override
public void registerBeanDefinition(String beanName, BeanDefinition beanDefinition) {
beanDefinitionMap.put(beanName, beanDefinition);
}
@Override
public boolean containsBeanDefinition(String beanName) {
return beanDefinitionMap.containsKey(beanName);
}
@Override
public <T> Map<String, T> getBeansOfType(Class<T> type) throws BeansException {
Map<String, T> result = new HashMap<>();
beanDefinitionMap.forEach((beanName, beanDefinition) -> {
Class beanClass = beanDefinition.getBeanClass();
if (type.isAssignableFrom(beanClass)) {
result.put(beanName, (T) getBean(beanName));
}
});
return result;
}
@Override
public String[] getBeanDefinitionNames() {
return beanDefinitionMap.keySet().toArray(new String[0]);
}
@Override
public BeanDefinition getBeanDefinition(String beanName) throws BeansException {
BeanDefinition beanDefinition = beanDefinitionMap.get(beanName);
if (beanDefinition == null) throw new BeansException("No bean named '" + beanName + "' is defined");
return beanDefinition;
}
@Override
public void preInstantiateSingletons() throws BeansException {
beanDefinitionMap.keySet().forEach(this::getBean);
}
}
small-spring-step-08/src/main/java/cn/bugstack/springframework/beans/factory/support/DefaultSingletonBeanRegistry.java 0 → 100755
浏览文件 @ 7795ca52
package cn.bugstack.springframework.beans.factory.support;
import cn.bugstack.springframework.beans.BeansException;
import cn.bugstack.springframework.beans.factory.DisposableBean;
import cn.bugstack.springframework.beans.factory.config.SingletonBeanRegistry;
import java.util.HashMap;
import java.util.Map;
import java.util.Set;
/**
* 博客：https://bugstack.cn - 沉淀、分享、成长，让自己和他人都能有所收获！
* 公众号：bugstack虫洞栈
* Create by 小傅哥(fustack)
*/
public class DefaultSingletonBeanRegistry implements SingletonBeanRegistry {
private Map<String, Object> singletonObjects = new HashMap<>();
private final Map<String, DisposableBean> disposableBeans = new HashMap<>();
@Override
public Object getSingleton(String beanName) {
return singletonObjects.get(beanName);
}
protected void addSingleton(String beanName, Object singletonObject) {
singletonObjects.put(beanName, singletonObject);
}
public void registerDisposableBean(String beanName, DisposableBean bean) {
disposableBeans.put(beanName, bean);
}
public void destroySingletons() {
Set<String> keySet = this.disposableBeans.keySet();
Object[] disposableBeanNames = keySet.toArray();
for (int i = disposableBeanNames.length - 1; i >= 0; i--) {
Object beanName = disposableBeanNames[i];
DisposableBean disposableBean = disposableBeans.remove(beanName);
try {
disposableBean.destroy();
} catch (Exception e) {
throw new BeansException("Destroy method on bean with name '" + beanName + "' threw an exception", e);
}
}
}
}
small-spring-step-08/src/main/java/cn/bugstack/springframework/beans/factory/support/DisposableBeanAdapter.java 0 → 100755
浏览文件 @ 7795ca52
package cn.bugstack.springframework.beans.factory.support;
import cn.bugstack.springframework.beans.BeansException;
import cn.bugstack.springframework.beans.factory.DisposableBean;
import cn.bugstack.springframework.beans.factory.config.BeanDefinition;
import cn.hutool.core.util.StrUtil;
import java.lang.reflect.Method;
/**
* Adapter that implements the {@link DisposableBean} and {@link Runnable} interfaces
* performing various destruction steps on a given bean instance:
* <p>
* 博客：https://bugstack.cn - 沉淀、分享、成长，让自己和他人都能有所收获！
* 公众号：bugstack虫洞栈
* Create by 小傅哥(fustack)
*/
public class DisposableBeanAdapter implements DisposableBean {
private final Object bean;
private final String beanName;
private String destroyMethodName;
public DisposableBeanAdapter(Object bean, String beanName, BeanDefinition beanDefinition) {
this.bean = bean;
this.beanName = beanName;
this.destroyMethodName = beanDefinition.getDestroyMethodName();
}
@Override
public void destroy() throws Exception {
// 1. 实现接口 DisposableBean
if (bean instanceof DisposableBean) {
((DisposableBean) bean).destroy();
}
// 2. 注解配置 destroy-method {判断是为了避免二次执行销毁}
if (StrUtil.isNotEmpty(destroyMethodName) && !(bean instanceof DisposableBean && "destroy".equals(this.destroyMethodName))) {
Method destroyMethod = bean.getClass().getMethod(destroyMethodName);
if (null == destroyMethod) {
throw new BeansException("Couldn't find a destroy method named '" + destroyMethodName + "' on bean with name '" + beanName + "'");
}
destroyMethod.invoke(bean);
}
}
}
small-spring-step-08/src/main/java/cn/bugstack/springframework/beans/factory/support/InstantiationStrategy.java 0 → 100755
浏览文件 @ 7795ca52
package cn.bugstack.springframework.beans.factory.support;
import cn.bugstack.springframework.beans.BeansException;
import cn.bugstack.springframework.beans.factory.config.BeanDefinition;
import java.lang.reflect.Constructor;
/**
* 博客：https://bugstack.cn - 沉淀、分享、成长，让自己和他人都能有所收获！
* 公众号：bugstack虫洞栈
* Create by 小傅哥(fustack)
* <p>
* Bean 实例化策略
*/
public interface InstantiationStrategy {
Object instantiate(BeanDefinition beanDefinition, String beanName, Constructor ctor, Object[] args) throws BeansException;
}
small-spring-step-08/src/main/java/cn/bugstack/springframework/beans/factory/support/SimpleInstantiationStrategy.java 0 → 100755
浏览文件 @ 7795ca52
package cn.bugstack.springframework.beans.factory.support;
import cn.bugstack.springframework.beans.BeansException;
import cn.bugstack.springframework.beans.factory.config.BeanDefinition;
import java.lang.reflect.Constructor;
import java.lang.reflect.InvocationTargetException;
/**
* 博客：https://bugstack.cn - 沉淀、分享、成长，让自己和他人都能有所收获！
* 公众号：bugstack虫洞栈
* Create by 小傅哥(fustack)
*/
public class SimpleInstantiationStrategy implements InstantiationStrategy {
@Override
public Object instantiate(BeanDefinition beanDefinition, String beanName, Constructor ctor, Object[] args) throws BeansException {
Class clazz = beanDefinition.getBeanClass();
try {
if (null != ctor) {
return clazz.getDeclaredConstructor(ctor.getParameterTypes()).newInstance(args);
} else {
return clazz.getDeclaredConstructor().newInstance();
}
} catch (NoSuchMethodException | InstantiationException | IllegalAccessException | InvocationTargetException e) {
throw new BeansException("Failed to instantiate [" + clazz.getName() + "]", e);
}
}
}
small-spring-step-08/src/main/java/cn/bugstack/springframework/beans/factory/xml/XmlBeanDefinitionReader.java 0 → 100755
浏览文件 @ 7795ca52
package cn.bugstack.springframework.beans.factory.xml;
import cn.bugstack.springframework.beans.BeansException;
import cn.bugstack.springframework.beans.PropertyValue;
import cn.bugstack.springframework.beans.factory.config.BeanDefinition;
import cn.bugstack.springframework.beans.factory.config.BeanReference;
import cn.bugstack.springframework.beans.factory.support.AbstractBeanDefinitionReader;
import cn.bugstack.springframework.beans.factory.support.BeanDefinitionRegistry;
import cn.bugstack.springframework.core.io.Resource;
import cn.bugstack.springframework.core.io.ResourceLoader;
import cn.hutool.core.util.StrUtil;
import cn.hutool.core.util.XmlUtil;
import org.w3c.dom.Document;
import org.w3c.dom.Element;
import org.w3c.dom.NodeList;
import java.io.IOException;
import java.io.InputStream;
/**
* Bean definition reader for XML bean definitions.
* <p>
* 博客：https://bugstack.cn - 沉淀、分享、成长，让自己和他人都能有所收获！
* 公众号：bugstack虫洞栈
* Create by 小傅哥(fustack)
*/
public class XmlBeanDefinitionReader extends AbstractBeanDefinitionReader {
public XmlBeanDefinitionReader(BeanDefinitionRegistry registry) {
super(registry);
}
public XmlBeanDefinitionReader(BeanDefinitionRegistry registry, ResourceLoader resourceLoader) {
super(registry, resourceLoader);
}
@Override
public void loadBeanDefinitions(Resource resource) throws BeansException {
try {
try (InputStream inputStream = resource.getInputStream()) {
doLoadBeanDefinitions(inputStream);
}
} catch (IOException | ClassNotFoundException e) {
throw new BeansException("IOException parsing XML document from " + resource, e);
}
}
@Override
public void loadBeanDefinitions(Resource... resources) throws BeansException {
for (Resource resource : resources) {
loadBeanDefinitions(resource);
}
}
@Override
public void loadBeanDefinitions(String location) throws BeansException {
ResourceLoader resourceLoader = getResourceLoader();
Resource resource = resourceLoader.getResource(location);
loadBeanDefinitions(resource);
}
@Override
public void loadBeanDefinitions(String... locations) throws BeansException {
for (String location : locations) {
loadBeanDefinitions(location);
}
}
protected void doLoadBeanDefinitions(InputStream inputStream) throws ClassNotFoundException {
Document doc = XmlUtil.readXML(inputStream);
Element root = doc.getDocumentElement();
NodeList childNodes = root.getChildNodes();
for (int i = 0; i < childNodes.getLength(); i++) {
// 判断元素
if (!(childNodes.item(i) instanceof Element)) continue;
// 判断对象
if (!"bean".equals(childNodes.item(i).getNodeName())) continue;
// 解析标签
Element bean = (Element) childNodes.item(i);
String id = bean.getAttribute("id");
String name = bean.getAttribute("name");
String className = bean.getAttribute("class");
String initMethod = bean.getAttribute("init-method");
String destroyMethodName = bean.getAttribute("destroy-method");
// 获取 Class，方便获取类中的名称
Class<?> clazz = Class.forName(className);
// 优先级 id > name
String beanName = StrUtil.isNotEmpty(id) ? id : name;
if (StrUtil.isEmpty(beanName)) {
beanName = StrUtil.lowerFirst(clazz.getSimpleName());
}
// 定义Bean
BeanDefinition beanDefinition = new BeanDefinition(clazz);
beanDefinition.setInitMethodName(initMethod);
beanDefinition.setDestroyMethodName(destroyMethodName);
// 读取属性并填充
for (int j = 0; j < bean.getChildNodes().getLength(); j++) {
if (!(bean.getChildNodes().item(j) instanceof Element)) continue;
if (!"property".equals(bean.getChildNodes().item(j).getNodeName())) continue;
// 解析标签：property
Element property = (Element) bean.getChildNodes().item(j);
String attrName = property.getAttribute("name");
String attrValue = property.getAttribute("value");
String attrRef = property.getAttribute("ref");
// 获取属性值：引入对象、值对象
Object value = StrUtil.isNotEmpty(attrRef) ? new BeanReference(attrRef) : attrValue;
// 创建属性信息
PropertyValue propertyValue = new PropertyValue(attrName, value);
beanDefinition.getPropertyValues().addPropertyValue(propertyValue);
}
if (getRegistry().containsBeanDefinition(beanName)) {
throw new BeansException("Duplicate beanName[" + beanName + "] is not allowed");
}
// 注册 BeanDefinition
getRegistry().registerBeanDefinition(beanName, beanDefinition);
}
}
}
small-spring-step-08/src/main/java/cn/bugstack/springframework/context/ApplicationContext.java 0 → 100755
浏览文件 @ 7795ca52
package cn.bugstack.springframework.context;
import cn.bugstack.springframework.beans.factory.ListableBeanFactory;
/**
* Central interface to provide configuration for an application.
* This is read-only while the application is running, but may be
* reloaded if the implementation supports this.
*
* 应用上下文
*
* 博客：https://bugstack.cn - 沉淀、分享、成长，让自己和他人都能有所收获！
* 公众号：bugstack虫洞栈
* Create by 小傅哥(fustack)
*/
public interface ApplicationContext extends ListableBeanFactory {
}
small-spring-step-08/src/main/java/cn/bugstack/springframework/context/ApplicationContextAware.java 0 → 100755
浏览文件 @ 7795ca52
package cn.bugstack.springframework.context;
import cn.bugstack.springframework.beans.BeansException;
import cn.bugstack.springframework.beans.factory.Aware;
/**
* Interface to be implemented by any object that wishes to be notified
* of the {@link ApplicationContext} that it runs in.
*
* 实现此接口，既能感知到所属的 ApplicationContext
*
* 博客：https://bugstack.cn - 沉淀、分享、成长，让自己和他人都能有所收获！
* 公众号：bugstack虫洞栈
* Create by 小傅哥(fustack)
*/
public interface ApplicationContextAware extends Aware {
void setApplicationContext(ApplicationContext applicationContext) throws BeansException;
}
\ No newline at end of file
small-spring-step-08/src/main/java/cn/bugstack/springframework/context/ConfigurableApplicationContext.java 0 → 100755
浏览文件 @ 7795ca52
package cn.bugstack.springframework.context;
import cn.bugstack.springframework.beans.BeansException;
/**
* SPI interface to be implemented by most if not all application contexts.
* Provides facilities to configure an application context in addition
* to the application context client methods in the
* {@link cn.bugstack.springframework.context.ApplicationContext} interface.
*
* 博客：https://bugstack.cn - 沉淀、分享、成长，让自己和他人都能有所收获！
* 公众号：bugstack虫洞栈
* Create by 小傅哥(fustack)
*/
public interface ConfigurableApplicationContext extends ApplicationContext {
/**
* 刷新容器
*
* @throws BeansException
*/
void refresh() throws BeansException;
void registerShutdownHook();
void close();
}
small-spring-step-08/src/main/java/cn/bugstack/springframework/context/support/AbstractApplicationContext.java 0 → 100755
浏览文件 @ 7795ca52
package cn.bugstack.springframework.context.support;
import cn.bugstack.springframework.beans.BeansException;
import cn.bugstack.springframework.beans.factory.ConfigurableListableBeanFactory;
import cn.bugstack.springframework.beans.factory.config.BeanFactoryPostProcessor;
import cn.bugstack.springframework.beans.factory.config.BeanPostProcessor;
import cn.bugstack.springframework.context.ConfigurableApplicationContext;
import cn.bugstack.springframework.core.io.DefaultResourceLoader;
import java.util.Map;
/**
* Abstract implementation of the {@link cn.bugstack.springframework.context.ApplicationContext}
* interface. Doesn't mandate the type of storage used for configuration; simply
* implements common context functionality. Uses the Template Method design pattern,
* requiring concrete subclasses to implement abstract methods.
* <p>
* 抽象应用上下文
* <p>
* 博客：https://bugstack.cn - 沉淀、分享、成长，让自己和他人都能有所收获！
* 公众号：bugstack虫洞栈
* Create by 小傅哥(fustack)
*/
public abstract class AbstractApplicationContext extends DefaultResourceLoader implements ConfigurableApplicationContext {
@Override
public void refresh() throws BeansException {
// 1. 创建 BeanFactory，并加载 BeanDefinition
refreshBeanFactory();
// 2. 获取 BeanFactory
ConfigurableListableBeanFactory beanFactory = getBeanFactory();
// 3. 添加 ApplicationContextAwareProcessor，让继承自 ApplicationContextAware 的 Bean 对象都能感知所属的 ApplicationContext
beanFactory.addBeanPostProcessor(new ApplicationContextAwareProcessor(this));
// 4. 在 Bean 实例化之前，执行 BeanFactoryPostProcessor (Invoke factory processors registered as beans in the context.)
invokeBeanFactoryPostProcessors(beanFactory);
// 5. BeanPostProcessor 需要提前于其他 Bean 对象实例化之前执行注册操作
registerBeanPostProcessors(beanFactory);
// 6. 提前实例化单例Bean对象
beanFactory.preInstantiateSingletons();
}
protected abstract void refreshBeanFactory() throws BeansException;
protected abstract ConfigurableListableBeanFactory getBeanFactory();
private void invokeBeanFactoryPostProcessors(ConfigurableListableBeanFactory beanFactory) {
Map<String, BeanFactoryPostProcessor> beanFactoryPostProcessorMap = beanFactory.getBeansOfType(BeanFactoryPostProcessor.class);
for (BeanFactoryPostProcessor beanFactoryPostProcessor : beanFactoryPostProcessorMap.values()) {
beanFactoryPostProcessor.postProcessBeanFactory(beanFactory);
}
}
private void registerBeanPostProcessors(ConfigurableListableBeanFactory beanFactory) {
Map<String, BeanPostProcessor> beanPostProcessorMap = beanFactory.getBeansOfType(BeanPostProcessor.class);
for (BeanPostProcessor beanPostProcessor : beanPostProcessorMap.values()) {
beanFactory.addBeanPostProcessor(beanPostProcessor);
}
}
@Override
public <T> Map<String, T> getBeansOfType(Class<T> type) throws BeansException {
return getBeanFactory().getBeansOfType(type);
}
@Override
public String[] getBeanDefinitionNames() {
return getBeanFactory().getBeanDefinitionNames();
}
@Override
public Object getBean(String name) throws BeansException {
return getBeanFactory().getBean(name);
}
@Override
public Object getBean(String name, Object... args) throws BeansException {
return getBeanFactory().getBean(name, args);
}
@Override
public <T> T getBean(String name, Class<T> requiredType) throws BeansException {
return getBeanFactory().getBean(name, requiredType);
}
@Override
public void registerShutdownHook() {
Runtime.getRuntime().addShutdownHook(new Thread(this::close));
}
@Override
public void close() {
getBeanFactory().destroySingletons();
}
}
small-spring-step-08/src/main/java/cn/bugstack/springframework/context/support/AbstractRefreshableApplicationContext.java 0 → 100755
浏览文件 @ 7795ca52
package cn.bugstack.springframework.context.support;
import cn.bugstack.springframework.beans.BeansException;
import cn.bugstack.springframework.beans.factory.ConfigurableListableBeanFactory;
import cn.bugstack.springframework.beans.factory.support.DefaultListableBeanFactory;
/**
* Base class for {@link cn.bugstack.springframework.context.ApplicationContext}
* implementations which are supposed to support multiple calls to {@link #refresh()},
* creating a new internal bean factory instance every time.
* Typically (but not necessarily), such a context will be driven by
* a set of config locations to load bean definitions from.
*
* 博客：https://bugstack.cn - 沉淀、分享、成长，让自己和他人都能有所收获！
* 公众号：bugstack虫洞栈
* Create by 小傅哥(fustack)
*/
public abstract class AbstractRefreshableApplicationContext extends AbstractApplicationContext {
private DefaultListableBeanFactory beanFactory;
@Override
protected void refreshBeanFactory() throws BeansException {
DefaultListableBeanFactory beanFactory = createBeanFactory();
loadBeanDefinitions(beanFactory);
this.beanFactory = beanFactory;
}
private DefaultListableBeanFactory createBeanFactory() {
return new DefaultListableBeanFactory();
}
protected abstract void loadBeanDefinitions(DefaultListableBeanFactory beanFactory);
@Override
protected ConfigurableListableBeanFactory getBeanFactory() {
return beanFactory;
}
}
small-spring-step-08/src/main/java/cn/bugstack/springframework/context/support/AbstractXmlApplicationContext.java 0 → 100755
浏览文件 @ 7795ca52
package cn.bugstack.springframework.context.support;
import cn.bugstack.springframework.beans.factory.support.DefaultListableBeanFactory;
import cn.bugstack.springframework.beans.factory.xml.XmlBeanDefinitionReader;
/**
* Convenient base class for {@link cn.bugstack.springframework.context.ApplicationContext}
* implementations, drawing configuration from XML documents containing bean definitions
* understood by an {@link cn.bugstack.springframework.beans.factory.xml.XmlBeanDefinitionReader}.
*
* 博客：https://bugstack.cn - 沉淀、分享、成长，让自己和他人都能有所收获！
* 公众号：bugstack虫洞栈
* Create by 小傅哥(fustack)
*/
public abstract class AbstractXmlApplicationContext extends AbstractRefreshableApplicationContext {
@Override
protected void loadBeanDefinitions(DefaultListableBeanFactory beanFactory) {
XmlBeanDefinitionReader beanDefinitionReader = new XmlBeanDefinitionReader(beanFactory, this);
String[] configLocations = getConfigLocations();
if (null != configLocations){
beanDefinitionReader.loadBeanDefinitions(configLocations);
}
}
protected abstract String[] getConfigLocations();
}
small-spring-step-08/src/main/java/cn/bugstack/springframework/context/support/ApplicationContextAwareProcessor.java 0 → 100755
浏览文件 @ 7795ca52
package cn.bugstack.springframework.context.support;
import cn.bugstack.springframework.beans.BeansException;
import cn.bugstack.springframework.beans.factory.config.BeanPostProcessor;
import cn.bugstack.springframework.context.ApplicationContext;
import cn.bugstack.springframework.context.ApplicationContextAware;
/**
* 博客：https://bugstack.cn - 沉淀、分享、成长，让自己和他人都能有所收获！
* 公众号：bugstack虫洞栈
* Create by 小傅哥(fustack)
*/
public class ApplicationContextAwareProcessor implements BeanPostProcessor {
private final ApplicationContext applicationContext;
public ApplicationContextAwareProcessor(ApplicationContext applicationContext) {
this.applicationContext = applicationContext;
}
@Override
public Object postProcessBeforeInitialization(Object bean, String beanName) throws BeansException {
if (bean instanceof ApplicationContextAware){
((ApplicationContextAware) bean).setApplicationContext(applicationContext);
}
return bean;
}
@Override
public Object postProcessAfterInitialization(Object bean, String beanName) throws BeansException {
return bean;
}
}
small-spring-step-08/src/main/java/cn/bugstack/springframework/context/support/ClassPathXmlApplicationContext.java 0 → 100755
浏览文件 @ 7795ca52
package cn.bugstack.springframework.context.support;
import cn.bugstack.springframework.beans.BeansException;
/**
* Standalone XML application context, taking the context definition files
* from the class path, interpreting plain paths as class path resource names
* that include the package path (e.g. "mypackage/myresource.txt"). Useful for
* test harnesses as well as for application contexts embedded within JARs.
* <p>
* XML 文件应用上下文
* <p>
* 博客：https://bugstack.cn - 沉淀、分享、成长，让自己和他人都能有所收获！
* 公众号：bugstack虫洞栈
* Create by 小傅哥(fustack)
*/
public class ClassPathXmlApplicationContext extends AbstractXmlApplicationContext {
private String[] configLocations;
public ClassPathXmlApplicationContext() {
}
/**
* 从 XML 中加载 BeanDefinition，并刷新上下文
*
* @param configLocations
* @throws BeansException
*/
public ClassPathXmlApplicationContext(String configLocations) throws BeansException {
this(new String[]{configLocations});
}
/**
* 从 XML 中加载 BeanDefinition，并刷新上下文
* @param configLocations
* @throws BeansException
*/
public ClassPathXmlApplicationContext(String[] configLocations) throws BeansException {
this.configLocations = configLocations;
refresh();
}
@Override
protected String[] getConfigLocations() {
return configLocations;
}
}
small-spring-step-08/src/main/java/cn/bugstack/springframework/core/io/ClassPathResource.java 0 → 100755
浏览文件 @ 7795ca52
package cn.bugstack.springframework.core.io;
import cn.bugstack.springframework.util.ClassUtils;
import cn.hutool.core.lang.Assert;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.InputStream;
public class ClassPathResource implements Resource {
private final String path;
private ClassLoader classLoader;
public ClassPathResource(String path) {
this(path, (ClassLoader) null);
}
public ClassPathResource(String path, ClassLoader classLoader) {
Assert.notNull(path, "Path must not be null");
this.path = path;
this.classLoader = (classLoader != null ? classLoader : ClassUtils.getDefaultClassLoader());
}
@Override
public InputStream getInputStream() throws IOException {
InputStream is = classLoader.getResourceAsStream(path);
if (is == null) {
throw new FileNotFoundException(
this.path + " cannot be opened because it does not exist");
}
return is;
}
}
small-spring-step-08/src/main/java/cn/bugstack/springframework/core/io/DefaultResourceLoader.java 0 → 100755
浏览文件 @ 7795ca52
package cn.bugstack.springframework.core.io;
import cn.hutool.core.lang.Assert;
import java.net.MalformedURLException;
import java.net.URL;
public class DefaultResourceLoader implements ResourceLoader {
@Override
public Resource getResource(String location) {
Assert.notNull(location, "Location must not be null");
if (location.startsWith(CLASSPATH_URL_PREFIX)) {
return new ClassPathResource(location.substring(CLASSPATH_URL_PREFIX.length()));
}
else {
try {
URL url = new URL(location);
return new UrlResource(url);
} catch (MalformedURLException e) {
return new FileSystemResource(location);
}
}
}
}
small-spring-step-08/src/main/java/cn/bugstack/springframework/core/io/FileSystemResource.java 0 → 100755
浏览文件 @ 7795ca52
package cn.bugstack.springframework.core.io;
import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStream;
public class FileSystemResource implements Resource {
private final File file;
private final String path;
public FileSystemResource(File file) {
this.file = file;
this.path = file.getPath();
}
public FileSystemResource(String path) {
this.file = new File(path);
this.path = path;
}
@Override
public InputStream getInputStream() throws IOException {
return new FileInputStream(this.file);
}
public final String getPath() {
return this.path;
}
}
small-spring-step-08/src/main/java/cn/bugstack/springframework/core/io/Resource.java 0 → 100755
浏览文件 @ 7795ca52
package cn.bugstack.springframework.core.io;
import java.io.IOException;
import java.io.InputStream;
public interface Resource {
InputStream getInputStream() throws IOException;
}
small-spring-step-08/src/main/java/cn/bugstack/springframework/core/io/ResourceLoader.java 0 → 100755
浏览文件 @ 7795ca52
package cn.bugstack.springframework.core.io;
public interface ResourceLoader {
/**
* Pseudo URL prefix for loading from the class path: "classpath:"
*/
String CLASSPATH_URL_PREFIX = "classpath:";
Resource getResource(String location);
}
small-spring-step-08/src/main/java/cn/bugstack/springframework/core/io/UrlResource.java 0 → 100755
浏览文件 @ 7795ca52
package cn.bugstack.springframework.core.io;
import cn.hutool.core.lang.Assert;
import java.io.IOException;
import java.io.InputStream;
import java.net.HttpURLConnection;
import java.net.URL;
import java.net.URLConnection;
public class UrlResource implements Resource{
private final URL url;
public UrlResource(URL url) {
Assert.notNull(url,"URL must not be null");
this.url = url;
}
@Override
public InputStream getInputStream() throws IOException {
URLConnection con = this.url.openConnection();
try {
return con.getInputStream();
}
catch (IOException ex){
if (con instanceof HttpURLConnection){
((HttpURLConnection) con).disconnect();
}
throw ex;
}
}
}
small-spring-step-08/src/main/java/cn/bugstack/springframework/util/ClassUtils.java 0 → 100755
浏览文件 @ 7795ca52
package cn.bugstack.springframework.util;
public class ClassUtils {
public static ClassLoader getDefaultClassLoader() {
ClassLoader cl = null;
try {
cl = Thread.currentThread().getContextClassLoader();
}
catch (Throwable ex) {
// Cannot access thread context ClassLoader - falling back to system class loader...
}
if (cl == null) {
// No thread context class loader -> use class loader of this class.
cl = ClassUtils.class.getClassLoader();
}
return cl;
}
}
small-spring-step-08/src/test/java/cn/bugstack/springframework/test/ApiTest.java 0 → 100755
浏览文件 @ 7795ca52
package cn.bugstack.springframework.test;
import cn.bugstack.springframework.context.support.ClassPathXmlApplicationContext;
import cn.bugstack.springframework.test.bean.UserService;
import org.junit.Test;
/**
* 博客：https://bugstack.cn - 沉淀、分享、成长，让自己和他人都能有所收获！
* 公众号：bugstack虫洞栈
* Create by 小傅哥(fustack)
*/
public class ApiTest {
@Test
public void test_xml() {
// 1.初始化 BeanFactory
ClassPathXmlApplicationContext applicationContext = new ClassPathXmlApplicationContext("classpath:spring.xml");
applicationContext.registerShutdownHook();
// 2. 获取Bean对象调用方法
UserService userService = applicationContext.getBean("userService", UserService.class);
String result = userService.queryUserInfo();
System.out.println("测试结果：" + result);
System.out.println("ApplicationContextAware："+userService.getApplicationContext());
System.out.println("BeanFactoryAware："+userService.getBeanFactory());
}
}
small-spring-step-08/src/test/java/cn/bugstack/springframework/test/bean/UserDao.java 0 → 100755
浏览文件 @ 7795ca52
package cn.bugstack.springframework.test.bean;
import cn.bugstack.springframework.beans.BeansException;
import cn.bugstack.springframework.context.ApplicationContext;
import cn.bugstack.springframework.context.ApplicationContextAware;
import java.util.HashMap;
import java.util.Map;
public class UserDao{
private static Map<String, String> hashMap = new HashMap<>();
public void initDataMethod(){
System.out.println("执行：init-method");
hashMap.put("10001", "小傅哥");
hashMap.put("10002", "八杯水");
hashMap.put("10003", "阿毛");
}
public void destroyDataMethod(){
System.out.println("执行：destroy-method");
hashMap.clear();
}
public String queryUserName(String uId) {
return hashMap.get(uId);
}
}
small-spring-step-08/src/test/java/cn/bugstack/springframework/test/bean/UserService.java 0 → 100755
浏览文件 @ 7795ca52
package cn.bugstack.springframework.test.bean;
import cn.bugstack.springframework.beans.BeansException;
import cn.bugstack.springframework.beans.factory.*;
import cn.bugstack.springframework.context.ApplicationContext;
import cn.bugstack.springframework.context.ApplicationContextAware;
/**
* 博客：https://bugstack.cn - 沉淀、分享、成长，让自己和他人都能有所收获！
* 公众号：bugstack虫洞栈
* Create by 小傅哥(fustack)
*/
public class UserService implements BeanNameAware, BeanClassLoaderAware, ApplicationContextAware, BeanFactoryAware {
private ApplicationContext applicationContext;
private BeanFactory beanFactory;
private String uId;
private String company;
private String location;
private UserDao userDao;
@Override
public void setBeanFactory(BeanFactory beanFactory) throws BeansException {
this.beanFactory = beanFactory;
}
@Override
public void setApplicationContext(ApplicationContext applicationContext) throws BeansException {
this.applicationContext = applicationContext;
}
@Override
public void setBeanName(String name) {
System.out.println("Bean Name is：" + name);
}
@Override
public void setBeanClassLoader(ClassLoader classLoader) {
System.out.println("ClassLoader：" + classLoader);
}
public String queryUserInfo() {
return userDao.queryUserName(uId) + "," + company + "," + location;
}
public String getuId() {
return uId;
}
public void setuId(String uId) {
this.uId = uId;
}
public String getCompany() {
return company;
}
public void setCompany(String company) {
this.company = company;
}
public String getLocation() {
return location;
}
public void setLocation(String location) {
this.location = location;
}
public UserDao getUserDao() {
return userDao;
}
public void setUserDao(UserDao userDao) {
this.userDao = userDao;
}
public ApplicationContext getApplicationContext() {
return applicationContext;
}
public BeanFactory getBeanFactory() {
return beanFactory;
}
}
small-spring-step-08/src/test/resources/spring.xml 0 → 100755
浏览文件 @ 7795ca52
<?xml version="1.0" encoding="UTF-8"?>
<beans>
<bean id="userDao" class="cn.bugstack.springframework.test.bean.UserDao" init-method="initDataMethod" destroy-method="destroyDataMethod"/>
<bean id="userService" class="cn.bugstack.springframework.test.bean.UserService">
<property name="uId" value="10001"/>
<property name="company" value="腾讯"/>
<property name="location" value="深圳"/>
<property name="userDao" ref="userDao"/>
</bean>
</beans>
\ No newline at end of file
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