Builder addService(String path, ServerServiceDefinition service,
                           @Nullable MethodDescriptor<?, ?> methodDescriptor, @Nullable Class<?> type,
                           List<? extends Function<? super HttpService,
                                   ? extends HttpService>> additionalDecorators) {
            requireNonNull(path, "path");
            requireNonNull(service, "service");
            requireNonNull(additionalDecorators, "additionalDecorators");

            entries.add(new Entry(normalizePath(path, methodDescriptor == null), service,
                                  methodDescriptor, type, additionalDecorators));
            return this;
        }
A registry of the implementation methods bound to a {@link GrpcService}. Used for method dispatch and
documentation generation.
grpc/src/main/java/com/linecorp/armeria/server/grpc/HandlerRegistry.java