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Spring-framework 源码阅读

源码编译

  • 下载源码并导入到IDEA中
  • 切换分支：git checkout -b v5.2.13.RELEASE
  • 在IDEA中的Terminal窗口中执行命令：gradlew :spring-oxm:compileTestJava
  • 运行单元测试报错问题
Error:(350, 51) java: 找不到符号变量 CoroutinesUtils

解决方案：导入相应的依赖模块，如下图所示 dependency

加载流程

加载配置文件 —> 读取类定义 —> 类实例化并加载进IoC容器

容器的实现

  • DefaultListableBeanFactory

Spring注册及加载bean的默认实现

  • AliasRegistry

别名注册接口，定义对别名的简单增删等操作

SpringMVC 源码阅读

SpringBoot

自动配置原理解析

//在启动时，使用`@EnableXXX`与`@Import`注册bean。
// EnableAutoConfiguration 注解，使用 @Import 注解往容器中注册相应的bean
@Import(AutoConfigurationImportSelector.class)
@Import(AutoConfigurationPackages.Registrar.class)
// AutoConfigurationImportSelector 类实现 ImportSelector 接口
//大批量的bean注册：这里主要会从 spring.factories 文件中读取配置好的一些类
@Override
public String[] selectImports(AnnotationMetadata annotationMetadata) {
	if (!isEnabled(annotationMetadata)) {
		return NO_IMPORTS;
	}
	AutoConfigurationEntry autoConfigurationEntry = getAutoConfigurationEntry(annotationMetadata);
	return StringUtils.toStringArray(autoConfigurationEntry.getConfigurations());
}
protected AutoConfigurationEntry getAutoConfigurationEntry(AnnotationMetadata annotationMetadata) {
	if (!isEnabled(annotationMetadata)) {
		return EMPTY_ENTRY;
	}
	AnnotationAttributes attributes = getAttributes(annotationMetadata);
	List<String> configurations = getCandidateConfigurations(annotationMetadata, attributes);
	configurations = removeDuplicates(configurations);
	Set<String> exclusions = getExclusions(annotationMetadata, attributes);
	checkExcludedClasses(configurations, exclusions);
	configurations.removeAll(exclusions);
	configurations = getConfigurationClassFilter().filter(configurations);
	fireAutoConfigurationImportEvents(configurations, exclusions);
	return new AutoConfigurationEntry(configurations, exclusions);
}
protected List<String> getCandidateConfigurations(AnnotationMetadata metadata, AnnotationAttributes attributes) {
	List<String> configurations = SpringFactoriesLoader.loadFactoryNames(getSpringFactoriesLoaderFactoryClass(),
			getBeanClassLoader());
	Assert.notEmpty(configurations, "No auto configuration classes found in META-INF/spring.factories. If you "
			+ "are using a custom packaging, make sure that file is correct.");
	return configurations;
}

声明式事务的原理

Spring Cache

注解：EnableCaching 默认适用 JDK 动态代理
通过：@Import(CachingConfigurationSelector.class) 将 AutoProxyRegistrar 和 ProxyCachingConfiguration 加载进 IoC 容器当中