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平时看spring源码中经常用到Conditional这个注解，今天来看一下他是怎么生效的
- 其实我是发现Conditional注解是在ConditionEvaluator类的shouldSkip方法中调用了
org.springframework.context.annotation.ConditionEvaluator#shouldSkip
shouldSkip方法有个枚举类型的参数ConfigurationPhase，PARSE_CONFIGURATION是标示配置解析阶段；REGISTER_BEAN标示配置注册阶段
/*** The various configuration phases where the condition could be evaluated.*/enum ConfigurationPhase {/*** The {@link Condition} should be evaluated as a {@code @Configuration}* class is being parsed.* <p>If the condition does not match at this point, the {@code @Configuration}* class will not be added.*/PARSE_CONFIGURATION,/*** The {@link Condition} should be evaluated when adding a regular* (non {@code @Configuration}) bean. The condition will not prevent* {@code @Configuration} classes from being added.* <p>At the time that the condition is evaluated, all {@code @Configuration}s* will have been parsed.*/REGISTER_BEAN}
- 接着发现shouldSkip方法是在ConfigurationClassParser类的processConfigurationClass方法中进行了调用
org.springframework.context.annotation.ConfigurationClassParser#processConfigurationClass
回到ConfigurationClassParser这个类就比较好理解，说明还是在解析配置阶段根据Conditional注解进行处理的
ConfigurationClassParser 解析配置流程，点击查看
参考文档中对Conditional注解有更详细的讲解
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