Cyrill commented on code in PR #2386:
URL: https://github.com/apache/ignite-3/pull/2386#discussion_r1289945304
##########
modules/configuration/README.md:
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@@ -195,6 +202,38 @@ public static class DatetimeColumnConfigurationSchema
extends ColumnConfiguratio
Thus, a column can only be one of these (varchar, decimal and datetime) types
and will contain the
type, name and fields specific to it.
+### Configuration extension
+
+Allows to add properties into other configurations.
+
+Suppose we have a `security` module and want to add one more authentication
component that is located
+in a different module that depends on `security`.
+
+```java
+@ConfigurationRoot(rootName = "security", type = ConfigurationType.DISTRIBUTED)
+public class SecurityConfigurationSchema {
+ @ConfigValue
+ public AuthenticationConfigurationSchema authentication;
+}
+
+@Config
+public class AuthenticationConfigurationSchema {
+ @Value(hasDefault = true)
+ public final boolean enabled = false;
+}
+```
+
+What we need to do is to subclass the configuration we want to extend.
+
+```java
+@ConfigurationExtension
+public class UserSecurityConfigurationSchema extends
SecurityConfigurationSchema {
+ @Value
+ public final String user;
+}
+```
+And the resulting configuration will look as if the field `user` was declared
directly in `SecurityConfigurationSchema`.
Review Comment:
Do we need to? The internal extension was never meant to be publicly
announced.
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