[GitHub] [dubbo] JasonMing commented on issue #8470: 提供可控的 `Invoker` 链组装过程。

[GitBox <gi...@apache.org>]

JasonMing commented on issue #8470:
URL: https://github.com/apache/dubbo/issues/8470#issuecomment-899334517


   ## Configurable `InvokerChain`
   
   The configurer mechanism is inspired by spring-webmvc's [`WebMvcConfigurer`](https://docs.spring.io/spring-framework/docs/current/javadoc-api/org/springframework/web/servlet/config/annotation/WebMvcConfigurer.html).
   It is a post processor provides a chance for user to change internal components programatically.
   
   The most important thing is, the `Invoker` model should be transparent to the users are **using** it, but should be configurable and expose details to the users are **configuring** it.
   
   ### `InovkerChainConfigurer` SPI
   
   The configurer is a callback essentially, the configurer will setup every components properly.
   
   ```java
   @SPI
   interface InovkerChainConfigurer {
       default void configurerRegistry(RegistryHandler handler) {}
       default void configureFilters(FilterHandler handler) {}
       // other hooks ......
   }
   ```
   
   The configuration code
   ```java
   class MyInovkerChainConfigurer implements InovkerChainConfigurer {
   
       @Override
       void configurerRegistry(RegistryHandler handler) {
           handler.setRegistryDirectory(......);
       }
   
       @Override
       void configurerFilters(FilterHanlder handler) {
           handler.remove(sentinelFilter);
       }
   }
   ```


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