Session based rmi

Question

hi everyone.
to be honest: i am a 100% newbie with rmi. anyways, this shouldnt be difficult for someone who has worked with rmi already.
i am trying to write a phonebook application (just playing around with rmi yet) with a rmi server and a several client with two user levels:
- user (can only review the data)
- admin (can also modify the data and shutdown the server)
what i need is a concept how it works to retrieve a user level (based on username / password) on client-side and how to differ who has called a specific method on server-side.
please direct me in the right direction!
thanks in advance.

Answer 1

I hope i get what u ask right
1)
have an interface like this
public interface itf extends Remote {
Integer createAuthority(String password, String username) throws RemoteException;
Data getData(Integer Authority_id) throws RemoteException;
public class Impl extends UnicastRemoteObjectit implements itf {
public Integer createAuthority(String password, String username) throws RemoteException {
// add ur logic here, assign the user a right authority id
public Data getData(Integer authrority_id ) throws RemoteExceptiona {
// 1) check if the authprity id is valid
// 2) check the power level...to what is allowed under this authority
every method u have here put an authority id (integer) as input could force users to log in first
then, u can decide what to do for the user when they call the remote metod with their authority id
u can provide some method to check whether the authity id is valid or what u want to do, if u dont want put many statements in one method
2)
i think the important point is create a good id
then store it in the server
like
Hashtable table = new Hashtable();
table.put(authority_id, Authority object); // this is in the createAuthority method
then, retirve it when every u need it
Authority object = (Authority)table.get(authrotiy id)
3)
create an Authority object to store any imformatoin u need
to use together with authroity id
Hope this can give u some idea what to do