I have Session EJBs working with DBForms....I didn't change any source code to DBForms
either.
What I did was within an interceptor,
lets say we have
preInsert(HttpServletRequest request, DBFormsConfig config, Hashtable fieldValues,
Connection con)
{
//request and config stuff can go here.
//jndi lookup...etc. (this could go in an abstract class that sandwiches
between the dbforms interceptor
and your own)
try
{
fieldValues = beanInterface.doFunction(fieldValues, con);//pass fieldValues
for business logic.
//shouldn't know about dbforms or request really. we want the beans to
be interoperable.
//the bean can have a flag that tells it whether to persist or return
persisance to the caller.
//some utility beans can also convert the raw fieldValues to Beans and
you can get dbforms apps
//to integrate with EJB apps...(kewl)
}catch
{
//based on what is caught, you can rethrow ValidationExceptions,
return DENY, (throw blank
ValidationExceptions(), log stuff, or simply decide
to return GRANT anyway.
//catch transactional exceptions, you could "recheck".
}
}
in this way, the interceptors are thin adapters that can do little extra dbforms and
web based work without doing a lot of business logic (like I used to do). The session
bean does business work on the fieldValues and can work with other servers, track
certain rules, calculate.
I think you can even do some transactional locking ie: between an inserts/selects and
updates by throwing
these exceptions or waiting "while(not_finished)"...of course, that can reduce
performance. You could also session flag so that other interceptor methods cannot do
that. (or you can put transactions in your database
functions if your database supports it. (you could use the stateful session bean and
declare a level of transactional thread safety on those session beans I think too)
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