Drools - Kie Spring Integration - Interfaces

Question

I am a newbie to Drools, Need some clarificatoins on Drools - Spring Integration.

 public KieFileSystem kieFileSystem() throws IOException {
    KieFileSystem kieFileSystem = getKieServices().newKieFileSystem();
    for (Resource file : getRuleFiles()) {
        kieFileSystem.write(ResourceFactory.newClassPathResource(RULES_PATH + file.getFilename(), "UTF-8"));
    }

    return kieFileSystem;
}

public KieContainer kieContainer() throws IOException {
    final KieRepository kieRepository = getKieServices().getRepository();


    kieRepository.addKieModule(new KieModule() {
        public ReleaseId getReleaseId() {
            return kieRepository.getDefaultReleaseId();
        }
    });

    KieBuilder kieBuilder = getKieServices().newKieBuilder(kieFileSystem());
    kieBuilder.buildAll();

    return getKieServices().newKieContainer(kieRepository.getDefaultReleaseId());
}

My understaing as per the documentation & few examples

1. We need to define rules in a file

2. KieFileSystem loads the rules into KieBuilder

3. KieBuilder holds the knowledge base

4. Based on KieBuilder we can prepare KieContainer & new KieSession

5. On KieSessoin we include the facts and fire the rules.

Question 1: What is the importance of KieModule, KieRepository, ReleaseId?

Question 2: I have seperate directories for different flows. How can I load specific rules based on flow?