Another try..
OK.. fourth try to get this posted on the OI list..
The LdapDelegate session bean proposed by Patrik would probably have to
implement SessionSynchronization and take care of the rollback in the
afterCompletion(boolean successfull) method. Just make sure that you keep
track of if an entry has been written or not.
That would leave us with something like:
<snip>
LdapDelegateEJB implements SessionBean, SessionSynchronization {
...
public void writeLdapEntry(){
...
entryWritten=true;
}
public void afterCompletion(boolean successfull){
if(!successfull){
if(entryWritten){
//clean-up the made
}
}
}
...
}
</snip>
For an example, check out the good old ATM sample's
UserManagementSessionEJB.
WR
----- Original Message -----
From: "Joni Suominen" <[EMAIL PROTECTED]>
To: "Orion-Interest" <[EMAIL PROTECTED]>
Sent: Tuesday, July 10, 2001 9:29 AM
Subject: Re: SV: LDAP and EJBs
Thanks Patrik!
There's one issue which still puzzles me. Do I have to write my own
rollback code for LDAP operations when a transaction rolls back? I
browsed the JNDI API and SPI and I couldn't figure out if JNDI somehow
supports transactions (like JDBC does with begin(), rollback() and
commit()).
If my code is following for instance:
UpdatingFacadeEJB implements SessionBean {
public void doTheUpdate() {
ldapDelegate.writeLdapEntry();
rdbmsDelegate.writeRdbmsRow();
}
}
Let's say that ldapDelegate.writeLdapEntry() succeeds but
rdbmsDelegate.writeRdbmsRow() fails by throwing an EJBException. In this
case can the container's transaction manager somehow rollback the LDAP
operations done earlier in ldapDelegate.writeLdapEntry() method?
--
Joni
[EMAIL PROTECTED]
> Patrik Andersson wrote:
>
> You would have one sessionbean being business delegate in front of the
> EntityBean manipulating the RDBMS and another managing the LDAP
> directory service. Then you would have a Facade in front of both these
> sessionbeans with one method that does the whole trick with
> transactional attributes set up to require a transaction before
> entering the method.
>
> interface UpdatingFacade : SessionBean {
> void doTheUpdate() throws RemoteException;
> }
>
> interface LdapDelegate : SessionBean {
> void writeLdapEntry() throws RemoteException;
> }
>
> interface RdbmsDelegate : SessionBean or EntityBean {
> void writeRdbmsRow() throws RemoteException;
> }
>
> Then you want an error in the writeLdapEntry() aswell as the
> writeRdbmsRow() to throw an EJBException breaking the transaction
> begun by doTheUpdate() method. Both writeXxx methods must require that
> a transaction already exists before being called. The doTheUpdate()
> method can really have it either way, as long as there is an active
> transaction associated to the thread calling it.
>
> regards,
> Patrik Andersson
>
> -----Ursprungligt meddelande-----
> Fr�n: Joni Suominen [mailto:[EMAIL PROTECTED]]
> Skickat: den 6 juli 2001 08:32
> Till: Orion-Interest
> �mne: LDAP and EJBs
>
> Hi everyone!
> I have a use case where I need to interface an LDAP directory and a
> relational database within a same transaction. That is, to create a
> new
> row to RDBMS from session bean using entity bean and to create an LDAP
>
> entry from the same session bean using Sun's LDAP provider through
> JNDI.
>
> 1. Is this possible?
>
> 2. Can I use container managed transactions?
>
> Thanks a lot!
>
> --
> Joni
> [EMAIL PROTECTED]
