Thanks for answering Richard.
These are statefull session beans, there is no transaction involved (well,
not that I know of)
----- Original Message -----
From: "Richard Katz" <[EMAIL PROTECTED]>
To: <[EMAIL PROTECTED]>
Sent: Friday, August 01, 2003 11:38 PM
Subject: Re: [JBoss-user] Pattern advice for ejb recovery wanted
> Hello Joao,
>
> Are you using demarcation and saving the transaction state with separate
containers?
>
>
> -------Original Message-------
> From: Joao Clemente <[EMAIL PROTECTED]>
> Sent: 08/01/03 01:11 PM
> To: [EMAIL PROTECTED]
> Subject: [JBoss-user] Pattern advice for ejb recovery wanted
>
> >
> > Well, I think I would like some feedback on how are the real
> implementations
> of failover recovery code out there.
>
> We though of three approaches:
> 1 - use ejbActivate: The method would see if the ojbect is in a
> non-consistent state and would revover if necessary.
> 2 - intercept every method with a initial test: Each method would start
> with "if recoveryNeeded() then recover"
> 3 - wrap a transient variable with a getter method that would recover
> that
> variable.
> getAVariable() {
> if (aVariable==null) recover();
> return aVariable
> }
>
> We still think that (1) is the best choice, but we had problem using it.
> Our
> ejb's have references for each other and they get each other variables
> when
> recovering so we would get locked while using ejbActivate.
>
> I think I can describe the problem like this: With 2 ejb's, where both
> need
> transient values that are found in the other, and where a client can start
> calling either one, we have:
>
> EJB1 {
> getValue2();
> businessMethod1(); // calls businessMethod2()
> }
> EJB2 {
> transient value2;
> recover(); // needs to get the value that is provided by EJB1:
> EJB1.getValue2();
> businessMethod2(); // manipulates value2
> }
>
> In a failover situation, if I have a call to EJB1.businessMethod1(), what
> is the pattern that allows to recover value2 ?
>
>
>
>
> --
> Joao Clemente - jpcl at rnl ist utl pt
>
>
>
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