如何使配置以另一个配置为条件? [英] How to make a configuration conditional on another configuration?

问题描述

我想让我的spring-boot配置类A依赖于另一个配置类B，即A配置仅在B 配置被评估.

I want to make my spring-boot configuration class A dependent on another configuration class B, i.e. A configuration is evaluated only if B configuration is evaluated.

在实际情况下，我有数百个 Ai 配置而只有一个 B，我想实现一种排除所有 Ai 的方法code> 通过在测试期间仅排除 B 进行配置.

In the real context, I have hundreds of Ai configurations and only one B, and I want to implement a way to exclude all the Ai configs by excluding only B during tests.

我尝试了以下方法:

@Configuration
@ConditionalOnBean(type = "org.my.B")
public class A1AutoConfiguration {
// ...
}

其中 B 是一个无条件配置类.

Where B is a unconditioned configuration class.

但是当我运行 mvn spring-boot:run -Ddebug=true 时，我看到 A 从未评估，因为 B 缺失.虽然在 B 中创建的 bean 在应用程序上下文中，但 B 本身不在.

But when I run mvn spring-boot:run -Ddebug=true I see that A is never evaluated because B is missing. While the beans created inside B are in the application context, B itself is not.

虽然我可以使 Ai 配置类依赖于 在内部创建的 bean B 但我不太喜欢这个解决方案.

I though I can make the Ai configuration classes dependent on beans created inside B but I don't like so much this solution.

是否有更简洁(且有效)的方式来实现这种依赖机制?

Is there a cleaner (and working) way to implement such a dependency mechanism?

推荐答案

关键是确保事物的顺序正确.如果您不能确保首先评估 B，那么要求 A 仅在 B 存在的情况下才申请是没有任何意义的.

The key is to make sure that things are ordered correctly. It does not make any sense to request A to only apply if B is present if you can't make sure that B is evaluated first.

数百部分让我有点害怕.如果 As 和 B 是自动配置的，则可以使用以下内容

The hundreds part frightens me a bit. If As and B are auto-configuration, you can use the following

@AutoconfigureAfter(B.class)
@ConditionalOnBean(B.class)
public class A123AutoConfiguration { ...}

如果 As 和 B 不是自动配置的，您需要确保首先处理 B，这样您就不能依赖常规的类路径扫描.

If As and B are not auto-configuration, you need to make sure B is processed first so you can't rely on regular classpath scanning for those.

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