[GitHub] [servicecomb-java-chassis] liubao68 commented on issue #2152: 写了一个记录三方请求的logFilter，当请求三方接口超时，logFilter无法接收到response，导致三方日志不打印

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

liubao68 commented on issue #2152:
URL: https://github.com/apache/servicecomb-java-chassis/issues/2152#issuecomment-748985847


   FallbackPolicy 的实现是 bean， 可以参考其他 java-chassis 的实现， 比如：
   
   ```
   @Component
   public class FromCacheFallbackPolicy implements FallbackPolicy {
     private static final String POLICY_NAME = "fromCache";
   
     private Map<String, Response> cachedResponse = new ConcurrentHashMap<>();
   
     @Override
     public String name() {
       return POLICY_NAME;
     }
   
     @Override
     public Response getFallbackResponse(Invocation invocation, Throwable error) {
       if (cachedResponse.get(invocation.getInvocationQualifiedName()) != null) {
         return cachedResponse.get(invocation.getInvocationQualifiedName());
       } else {
         return Response.succResp(null);
       }
     }
   
     @Override
     public void record(Invocation invocation, Response response, boolean isSuccess) {
       if (isSuccess) {
         cachedResponse.put(invocation.getInvocationQualifiedName(), response);
       }
     }
   }
   ```


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