[jboss-user] [Beginners Corner] - Project EJB and JSF designquestion - where to implement whic

[NSchweig]

I am developing an application with JSF and EJB 3.0.
Now I have got a question where I should  implement methods that manipulate my objects.

Example1: The EJB SessioBean only implements methods to get data from the database and to persist or merge objects:

EJB SessionBean courseHandler
public void createCourse(Course course){
  | 		em.persist(course);
  | }

The managedBean courseBean manipulates the object:
managedBean JSF courseBean 


  | public void joinCourse(){
  | 		currentUser = userHandler.getCmtUserByUserName(getRemoteUserName());
  | 		currentCourse.getParticipants().add(currentUser);
  | 		currentUser.getCourses().add(currentCourse);
  | 		courseHandler.updateCourse(currentCourse);
  | 		CustomMessage.createMessage("course_joined");
  | }


Or should example 2 be the better version:

The EJB SessionBean courseHandler manipulates the object and persists/merges it:

public void joinCourse(CmtUser user, Course course){
  | 	course.getParticipants().add(user);
  | 	user.getCourses().add(course);
  |         em.merge(course);
  | }

managedBean JSF courseBean

public void joinCourse(){
  | 		currentUser = userHandler.getCmtUserByUserName(getRemoteUserName());
  | courseHandler.joinCourse(currentUser,currentCourse)
  | 		CustomMessage.createMessage("course_joined");
  | }

Thank you for your answers!
NSchweig





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