Initializing the factory at compile time

I have a factory that should return an implementation depending on the name.

    val moduleMap = Map(Modules.moduleName -> new ModuleImpl)
    def getModule(moduleName: String): Module =
        moduleMap.get(moduleName) match {
          case Some(m) => m
          case _ =>
            throw new ModuleNotFoundException(
              s"$moduleName - Module could not be found.")
        }

In order for each call to the "getModule" method not to create an instance, there is a map in which all the modules must be initialized in bootstrap class. I would like to get rid of the need to do this manually(also all classes have a distinctive feature).

List of options that came to my mind:

• Reflection(we can use Scala Reflection API or any thrid-party library)
  • Automated process.
  • Need to initialize immediately at startup.
  • Reflection is a pain.
• Metaprogramming(ScalaMeta) + Reflection
  • Macros only change the code, the execution happens later.

Can we move initialization process to compile time?

I know that compiler can optimize and replace code, next fragment before compilation

val a = 5 + 5

after compilation compiler change that piece to 10, can we use some directives or another tools to evaluate and execute some code at compile time and use only final value?