How to run a Haskell code by its name?

First of all, I'm new in Haskell and I'm curious how can I implement something that I have working in Java.

A bit of prehistory:

I have a Java-based project with workers. Workers can be started periodically and do some work. A worker - is just a Java-class with some functionality implemented. New workers can be added and configured. Workers' names and parameters are stored in a data base. Periodically, the application gathers workers' details (names, params) from DB and starts them. In Java, to start worker by its name, I do the following:

Class<?> myClass = Class.forName("com.mycompany.superworker");
Constructor<?> constructor = myClass.getConstructor();
MyClass myInstance = (MyClass) constructor.newInstance();
myInstance.run("param1", "param2");

Hence, the application gets worker's name (the actual class name) from DB, gets class and constructor, creates new instance of the class and then just runs it.

Now, the question: how I could implement something similar in Haskell? I mean, if I have some function/module/class whatever implemented in Haskell and I have its name stored in plain text, - then how can I run this code by its name (from the main Haskell-based application, of course)?

Thanks