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

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

plusmancn commented on issue #8470:
URL: https://github.com/apache/dubbo/issues/8470#issuecomment-904750134


   > （因为 filter 总是覆盖而非追加）
   
   @JasonMing When I refer to the official docs, it says:
   > provider 和 service 同时配置的 filter 时，累加所有 filter，而不是覆盖。比如：<dubbo:provider filter="xxx,yyy"/> 和 <dubbo:service filter="aaa,bbb" />，则 xxx,yyy,aaa,bbb 均会生效。如果要覆盖，需配置：<dubbo:service filter="-xxx,-yyy,aaa,bbb" />
   
   and I have verified it by the following config,  `AFilter` was annotated by `@Activate`,  the `AFilter` didn't appear in RPC producer, but `BFilter` dit as expected. 
   ```xml
   
   <dubbo:consumer filter="-a"/> 
   <dubbo:reference filter="b"/>
   ```
   
   But I found another problem that we have no config option to control `AFilter` not appaerning in `getMetadataInfo` process.
   ```java
   metadataInfo = metadataServiceProxy
              .getMetadataInfo(ServiceInstanceMetadataUtils.getExportedServicesRevision(instance));
   ```
   


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