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xxw1754352621 / java-dev

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@Conditional(ConditionalOnConsulEnabled.OnConsulEnabledCondition.class) 和 ConfigurationCondition类的使用 #19

Open xxw1754352621 opened 5 years ago

xxw1754352621 commented 5 years ago

不启动consul

spring.cloud.consul.enabled=false

AllNestedConditions 1 matched 1 did not; NestedCondition on ConditionalOnConsulEnabled.OnConsulEnabledCondition.FoundClass @ConditionalOnClass found required class 'com.ecwid.consul.v1.ConsulClient'; NestedCondition on ConditionalOnConsulEnabled.OnConsulEnabledCondition.FoundProperty @ConditionalOnProperty (spring.cloud.consul.enabled) found different value in property 'spring.cloud.consul.enabled' (ConditionalOnConsulEnabled.OnConsulEnabledCondition)

xxw1754352621 commented 5 years ago

ConfigurationCondition 提供更细的颗粒度，控制配置类是否需要加载（ offers more fine-grained control）

过滤类的阶段不一样

1.ConfigurationPhase.PARSE_CONFIGURATION（解析配置类的时候）

2.ConfigurationPhase.REGISTER_BEAN(当注册bean的时候，非配置类non {@code @Configuration}) bean)

xxw1754352621 commented 5 years ago

OnConsulEnabledCondition 继承 AllNestedConditions，必须实现OnConsulEnabledCondition 所有的嵌套条件才能成功注入和解析 这个类有两个条件：

@ConditionalOnProperty(value = "spring.cloud.consul.enabled", matchIfMissing = true)
static class FoundProperty {}

@ConditionalOnClass(ConsulClient.class)
static class FoundClass {}

所以上面的提示解析为，找到了ConsulClient客户端，没有匹配配置 参考： https://leokongwq.github.io/2017/05/28/springboot-autoconfiguration.html