Enrity dirty checking in flushMode=MANUAL

24. Jun 2008, 14:05 CET | Link Martin Goik

I do have an Entity User and a corresponding UserHome with manual flushing enabled:

@Name("userHome")
@Scope(ScopeType.CONVERSATION)
public class UserHome extends EntityHome<User> {
    ...
  @In(create=true ) private EntityInfoManager entityInfoManager;
  private String pw1, pw2;
    ...
  @Override
  public String update() {
    final User u = getInstance();
    ...
    if (someCondition) {
      return null;
    } else {
      u.setUserPassword(PasswordUtil.generateRandomSaltMd5Digest(pw1));
    } 
    getEntityManager().flush();
    return super.update();
  }
  @Override 
  @Begin(flushMode=FlushModeType.MANUAL, join=true)
  public void create() {
    super.create();
    //business logic code omitted
  }
}

The corresponding view user.xhtml contains:

<h:commandButton id="update" value="Update" action="#{userHome.update}"
rendered="#{userHome.managed}" />

The User entity references other entities that may or may not be changed in the conversation and so far it works.

Now I want to display this update button shaded as long as no entity has been changed. In other words: I want to know if the User instance object or any referenced object within the conversation is in a dirty state.

I searched the Seam documentation and this (plus the former) Seam user's forum but did not find any hint.