Hello,
I am looking for correct design pattern which will allow me to access data via EJB remotly. I want to have a single point of enterance both for SEAM application and for other applications, which use the same data.
My current idea is to have:
- Stateless EJB acting as a DAO
- Stateful EJB, acting as a seam action
- JSF as a presentation layer
The stateful EJB calls the stateless to get the data. It also additionally has a remote interface which allows other application to call it. Due to convetions of seam I have to "double" the interface, for example:
@DataModel
private List<Contact> contacts;
@DataModelSelection
private Contact contact;
@Factory("contacts")
public void findAll() {
if(contacts == null) {
contacts = myStatelessBean.findAll();
}
}
public List<Contact> getContacts() {
findAll();
return contacts;
}
I find this sollution quite innatural, because you have to implement two interfaces, which do quite the same thing. The other idea is to develop a facade, but it introduces another problem: passing parameters and returning values - it is done by @In and @Out annotations in seam. You will have to call additional methods from facade to set parameters and get the returning values.
Which sollution is better? Maybe you know a better sollution for this problem?
thx
