“Spring Boot 2 自动配置流程”的版本间的差异
Jihongchang（讨论 | 贡献） |
Jihongchang（讨论 | 贡献） |
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| 第134行： | 第134行： | ||
package org.springframework.boot.autoconfigure.cache; | package org.springframework.boot.autoconfigure.cache; | ||
| + | …… | ||
| + | import org.springframework.cache.CacheManager; | ||
…… | …… | ||
| 第149行： | 第151行： | ||
} | } | ||
| − | </syntaxhighlight> | + | </syntaxhighlight>@ConditionalOnClass(CacheManager.class) 类路径中有，是 spring-context-5.2.9.RELEASE.jar 中的包，所以这个条件是成立的 |
2023年3月5日 (日) 06:47的版本
https://www.bilibili.com/video/BV19K4y1L7MT?p=15
以 AopAutoConfiguration 为例分析自动配置类
以 spring-boot-autoconfigure-2.3.4.RELEASE.jar 中的 org.springframework.boot.autoconfigure.aop.AopAutoConfiguration 为例，分析自动配置流程
spring-boot-autoconfigure-2.3.4.RELEASE.jar\META-INF\spring.factories
……
# Auto Configure
……
org.springframework.boot.autoconfigure.aop.AopAutoConfiguration,\
……
package org.springframework.boot.autoconfigure.aop;
import org.aspectj.weaver.Advice;
……
@Configuration(proxyBeanMethods = false)
@ConditionalOnProperty(prefix = "spring.aop", name = "auto", havingValue = "true", matchIfMissing = true)
public class AopAutoConfiguration {
@Configuration(proxyBeanMethods = false)
@ConditionalOnClass(Advice.class)
static class AspectJAutoProxyingConfiguration {
@Configuration(proxyBeanMethods = false)
@EnableAspectJAutoProxy(proxyTargetClass = false)
@ConditionalOnProperty(prefix = "spring.aop", name = "proxy-target-class", havingValue = "false",
matchIfMissing = false)
static class JdkDynamicAutoProxyConfiguration {
}
@Configuration(proxyBeanMethods = false)
@EnableAspectJAutoProxy(proxyTargetClass = true)
@ConditionalOnProperty(prefix = "spring.aop", name = "proxy-target-class", havingValue = "true",
matchIfMissing = true)
static class CglibAutoProxyConfiguration {
}
}
@Configuration(proxyBeanMethods = false)
@ConditionalOnMissingClass("org.aspectj.weaver.Advice")
@ConditionalOnProperty(prefix = "spring.aop", name = "proxy-target-class", havingValue = "true",
matchIfMissing = true)
static class ClassProxyingConfiguration {
ClassProxyingConfiguration(BeanFactory beanFactory) {
if (beanFactory instanceof BeanDefinitionRegistry) {
BeanDefinitionRegistry registry = (BeanDefinitionRegistry) beanFactory;
AopConfigUtils.registerAutoProxyCreatorIfNecessary(registry);
AopConfigUtils.forceAutoProxyCreatorToUseClassProxying(registry);
}
}
}
}
@Configuration 说明这是一个配置类；
@ConditionalOnProperty(prefix = "spring.aop", name = "auto", havingValue = "true", matchIfMissing = true)
配置文件中是否存在 spring.aop 这个配置，如果存在了 spring.aop.auto 这个配置，并且它的值是“true”，那么这个类中的其他配置就生效，matchIfMissing = true 就算没有响应的配置，也认为满足条件，所以相当于这个配置是生效的
再来看
@Configuration(proxyBeanMethods = false)
@ConditionalOnClass(Advice.class)
static class AspectJAutoProxyingConfiguration {
@Configuration(proxyBeanMethods = false)
@EnableAspectJAutoProxy(proxyTargetClass = false)
@ConditionalOnProperty(prefix = "spring.aop", name = "proxy-target-class", havingValue = "false",
matchIfMissing = false)
static class JdkDynamicAutoProxyConfiguration {
}
@Configuration(proxyBeanMethods = false)
@EnableAspectJAutoProxy(proxyTargetClass = true)
@ConditionalOnProperty(prefix = "spring.aop", name = "proxy-target-class", havingValue = "true",
matchIfMissing = true)
static class CglibAutoProxyConfiguration {
}
}
@Configuration 说明这是一个配置类；
@ConditionalOnClass(Advice.class) 类路径中是否存在 org.aspectj.weaver.Advice 这个类，在 IDEA 中 按两下 Shift 只有选择 Classes tab 页，没有 org.aspectj.weaver.Advice这个类，所以这个类中的其他配置也就不生效了
接着再来看
@Configuration(proxyBeanMethods = false)
@ConditionalOnMissingClass("org.aspectj.weaver.Advice")
@ConditionalOnProperty(prefix = "spring.aop", name = "proxy-target-class", havingValue = "true",
matchIfMissing = true)
static class ClassProxyingConfiguration {
ClassProxyingConfiguration(BeanFactory beanFactory) {
if (beanFactory instanceof BeanDefinitionRegistry) {
BeanDefinitionRegistry registry = (BeanDefinitionRegistry) beanFactory;
AopConfigUtils.registerAutoProxyCreatorIfNecessary(registry);
AopConfigUtils.forceAutoProxyCreatorToUseClassProxying(registry);
}
}
}
@Configuration 说明这是一个配置类；
@ConditionalOnMissingClass("org.aspectj.weaver.Advice") 当系统中没有 org.aspectj.weaver.Advice 这个类的时候生效；
@ConditionalOnProperty(prefix = "spring.aop", name = "proxy-target-class", havingValue = "true", matchIfMissing = true) 配置文件中是不是配置了 spring.aop.proxy-target-class=true，没配也当配了生效；
以 CacheAutoConfiguration 为例分析自动配置类
spring-boot-autoconfigure-2.3.4.RELEASE.jar\META-INF\spring.factories
……
# Auto Configure
……
org.springframework.boot.autoconfigure.cache.CacheAutoConfiguration,\
……
package org.springframework.boot.autoconfigure.cache;
……
import org.springframework.cache.CacheManager;
……
@Configuration(proxyBeanMethods = false)
@ConditionalOnClass(CacheManager.class)
@ConditionalOnBean(CacheAspectSupport.class)
@ConditionalOnMissingBean(value = CacheManager.class, name = "cacheResolver")
@EnableConfigurationProperties(CacheProperties.class)
@AutoConfigureAfter({ CouchbaseDataAutoConfiguration.class, HazelcastAutoConfiguration.class,
HibernateJpaAutoConfiguration.class, RedisAutoConfiguration.class })
@Import({ CacheConfigurationImportSelector.class, CacheManagerEntityManagerFactoryDependsOnPostProcessor.class })
public class CacheAutoConfiguration {
……
}
@ConditionalOnClass(CacheManager.class) 类路径中有，是 spring-context-5.2.9.RELEASE.jar 中的包，所以这个条件是成立的