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
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