A async rpc agent plugin can not work

[liucyu]

Question

I wrote a rpc agent plugin, and the Interceptor method will return null result when i use the async mode. so the ContextManager.stopSpan(); in afterMethod will throw NullPointerException and the ui cannot display the trace chain. so how can I solve this question
??

[wu-sheng]

Please learn from Vert.x and gRPC stream plugins. Async and sync are working in a different way.

[liucyu]

Is there any documentation for reference? grpc or vert.x has no comments, it is difficult to understand what he wants to express @wu-sheng

[wu-sheng]

For APIs, we have detailed documents about plugin development. What else do you need? Across thread is comples, you need to decide

1. Use capture/continued(grpc stream)
   Or
2. Set span async and finish in another thread(vert.x)

I can't give a simple choose. You need understand trace and APIs.