INTERNAL API

Wraps the invocation of each user service method in the generated SDK ScalaHandlerFactory, run synchronously inside intercept on the same thread. Picked up from the request attribute InvocationInterceptor.Key, when not present InvocationInterceptor.NoOp is used. The service instance is created before the request is unmarshalled, outside of the interceptor.

Only that synchronous part is covered. User code that runs later, on other threads, runs outside of the interceptor: continuations of a returned CompletionStage, the stages of a returned Source and the processing of the incoming Source for client and bidirectional streaming methods.

Only called when a user method is invoked. It is not called for an unknown method, an unsupported content type, a unary or server streaming request body that cannot be decoded, or when the instance factory denies the request. For client and bidirectional streaming it is called also when the body is malformed, since the method receives the incoming Source before any element is decoded.

Code generated by 2.5.13 and earlier never calls the interceptor.