Generator interfaces that plugins implement to add new generators.

Create a new Generator

1. Create a new module, and set GeneratorAPI as a dependency.
2. Create a new class that implements Generator. Because Generator interface extends LongTask, add LongTaskAPI as another of your module dependency.
3. Add @ServiceProvider annotation to your class to declare you are implementing a Generator service. Put Generator.class as the annotation service parameter.
4. Implement GeneratorUI if your generator needs a settings panel and return it from getUI() method.