Hi
Yes we have done this no problem.
We
1) Define a "GenericRemote", and a "GenericHome"
2) Define two (or more implementations) "Impl1EJB" and "Impl2EJB" that have
methods to realize "GenericRemote" and "GenericHome"
3) In the deployment descriptor define entries such as
<session>
<description>Implementation 1</description>
<ejb-name>Impl1</ejb-name>
<home>...GenericHome<./home>
<remote>...GenericRemote</remote>
<ejb-class>...Impl1EJB</ejb-class>
....
</session>
<session>
<description>Implementation 2</description>
<ejb-name>Impl2</ejb-name>
<home>...GenericHome<./home>
<remote>...GenericRemote</remote>
<ejb-class>...Impl2EJB</ejb-class>
....
</session>
Then use code such as the following
String implName = "Impl1" // or "Impl2 if that is what you want
InitialContext ic - new InitialContext();
GenericHome gh = (GenericHome)PortableRemoteObject.narrow(
ic.lookup(implName), GenericHome.class);
GenericRemote gr = gh.create() // for example
Now you have remote reference gr to either Impl1EJB or Impl2EJB depending
on the JNDI name of the EJB.
Cheers
Lawrence
> ----------
> From: Bas Eefting[SMTP:[EMAIL PROTECTED]]
> Reply To: Bas Eefting
> Sent: 09 May 2001 14:13
> To: [EMAIL PROTECTED]
> Subject: Generic Approach of EJB's
>
> Hi,
>
> we want to talk to EJB's in a generic way. This means we have a set of
> EJB's
> (the set may be expanded), all with the same functions, only difference is
> their implementation.
> Take a "public void send(String message)" method for example.
>
> Is it possible to look up these different beans with only a difference in
> the JNDI name?
> I tried but could not succeed, but that's not surprising me being fairly
> new
> to EJB's.
>
> In the code we see this:
> Context context = new InitialContext(env);
> Object obj = context.lookup(jndi);
>
> //specific code
> Prot_AHome home =
> (Prot_AHome)PortableRemoteObject.narrow(obj, Prot_AHome.class);
> Prot_A bean = home.create();
> bean.send(message);
>
> With Prot_A being the class of one of the EJB's. We want to add Prot_B,
> Prot_B,etc. Is there any way we can use an interface for this? So the code
> would be:
> ProtHome home = (ProtHome)PortableRemoteObject.narrow(obj,
> ProtHome.class);
> Prot bean = home.create();
> bean.send(message);
> and the only difference would be in the JNDI name. Someone said it could
> not
> be done 'cause of a not really Object Oriented Design of EJB's home
> interface or something.
> Is this true? And if so, why was this design decision taken?
>
> Any help would be welcome,
> regards
> Bas Eefting
>
>
>
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