interface FunctionServer {
    fun <T : Any, R : Any, D : FunctionDescriptor<T, R>> resolveDescriptor(name: String): D

    suspend fun <T : Any, R : Any, D : FunctionDescriptor<T, R>> call(descriptor: D, arg: T): R

    suspend fun <T : Any, R : Any> call(name: String, arg: T): R =
        call(resolveDescriptor(name),arg)
}