[DISCUSSION] Idea about making Filter totally asynchronous and event-driven.

[jun liu]

Hi,

I am thinking of the possibility of changing the current Filter definition 
model to make it totally asynchronous and event-driven. Here’s the detailed 
proposal[1]. It’s only a immature idea at present so I am not sure fi it’s good 
to have this change yet, especially from the user’s side.

In short, the new Filter would look like:

public interface Filter {
   void onSend(Invocation invocation) {
     // before invoke, throw exception to terminate 
    }

   void onResponse(Result result, Invoker<?> invoker, Invocation invocation) {
        // biz return successfully
    }

   void onError(Throwable e) throws RpcException{
        // biz throw exception
    }
}

1. https://github.com/apache/incubator-dubbo/issues/3585

Jun