Deciding right type of Bean

hi all,
i have to decide which kind of bean to use for my applications and i have a little doubt.
my app is structure like that:
- a Client which sends XML messages to an EJ B
- the EJB mentioned above, from the message figures out which Message Bean to call and loads the Home and Remote interface 4 that bean, and then send the message .
Before digging into the problem, i must say that i designed the application so that there are 4 different layers totally independento from each other
- a client that uses
- a connetion class that connect to the web server
- an EJB which decises where to dispatch its calls
- a set of MessageBeans calles from the dispatcher in case the client want to have asynchronous calls
- a set of Entity/SEssion bean on the backend that performs the computation.
Flow of action is like this
client-->Connection--->DispatcherEJB---->MessageBean----->backend EJB when call is asynchronous
or
client--->Connection-->DispatcherEJB---->backendEJB when call is synchronous
Now, for the dispatcher to do its job it should keep an HashMap that defined, depending on the messge, which bean (MessageBean or backendBean) to call.
In the hashtable, a bean name is mapped to its remote and/or home interface.
Now, the Dispatcher Bean should receive data from many different clients, and it may be shared by multiple clients. Also, it should also have persistence, because if i decide to deploy a new MessageBean, the name of this newly created bean won't be present in the HashMap maintained by the Dispatcher. And if it is NOT present, the dispatcher must load the classes (i am using some naming conventions) and then put it into the HashMap.
Why i cannot decide which kind of bean type to use?? because for some reasons (persistence, multiple clients) i am oriented toward entity beans, but for some others (if the bean name is not present, it must be added to the DB ) make me think that i can simply solve it by using a SessionBean.
can anyone suggest me the best solution???
thanx in advance and regards
marco

hi,
sorry...i thought a little more and i found out that it is better modeled as Entity EJB.
I can model so that each bean has
- beanName
- homeNmae
- remoteName
i don't need to keep an HashMap since i will fetch the data from the DB.
if i fetch data from DB and receive null, then i will know that th e bean has been newly added, and so i have to create a new entry.
Can i use that solution rahter than keeping an HashMap?
regards
marco

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