mirror of https://github.com/grpc/grpc-java.git
9f56b8cea2
We found that the interceptor approach for `ConfigSelector` would be adding a layer of indirection for no gain: The API Result selectConfig(LoadBalancer.PickSubchannelArgs args) consumes headers among other inputs, because route matching might need to match the headers; and the API produces ClientInterceptor among other outputs. But the headers is not available until clientCall.start(listner, headers), whereas the interceptor need be applied to the call before clientCall.start(). So the input is not available until the output is applied. That means we will need to delay calling the downstream newCall() (which will either be RealChannel or the interceptor) until start() is called. So we want to change to the other approach similar to what c-core is taking: Have `Result(Object config, CallOptions, Runnable committedCallback)`, where CallOption is the selector modified CallOption, and committedCallback is used to monitor the call lifecycle. |
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