Choreography Example

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public class Main
{
	public static void main(String[] args) {
		BundleChore.event_subscriber_list.add("addUser", [MailService, AuditLog, DelayDowngrade, LicenseCount]);
		BundleChore.event_subscriber_list.add("addUserFromIam", [MailService, DelayDowngrade, LicenseCount]);
 
		
		UserService.addUser();
	}
}
 
// Choreography Model
class UserService{
    public static void addUser(){
        // Add to Db
        // Add to IAM,...
        BundleChore.handleEvent("addUser")
    }
}
 
class UserService{
    public static void addUser(){
        // Add to Db
        // Add to IAM,...
        sendMail();
        ..
        ..
    }
}
 
 
public BundleChore{
    
    public static Map<String, List<Subscriber>> event_subscriber_list = new HashMap<String, Subscriber>();
    
    public void handleEvent(String eventName){
        List<Subscriber> allEventSubs = event_subscriber_list.get(eventName);
        for(Subscriber s:allEventSubs){
            s.subscribeEvent(eventName);
        }
        
    }
}
 
interface Subscriber{
    public void subscribeEvent(String eventName);
}
 
class MailService implements Subscriber{
    
    @Override
    public static void subscribeEvent(String eventName){
        if(eventName=="addUser"){  sendUserAddedMail(); };
    }
    
    private static sendUserAddedMail(){ ... }
}