Hi Oliver,
which version do you use?
I think >0.94 OJB isn' a singleton.
regards,
Armin
/**
* Return new instance of the {@link org.odmg.Implementation} class.
*/
public static Implementation getInstance()
{
OJB implementation = new OJB();
implementation.setConfigurator(PersistenceBrokerFactory.getConfigurator(
));
return implementation;
}
----- Original Message -----
From: <[EMAIL PROTECTED]>
To: <[EMAIL PROTECTED]>
Sent: Monday, February 10, 2003 9:25 AM
Subject: Why tries odmg.OJB to be a singleton?
Hello,
I have a question and a remark.
Q: Why is odmg.OJB a singleton? Am I going
to run into problems if I use two instances of OJB?
R: Since the constructor of OJB is protected, I can easily
bypass the singleton constraint by
firstOdmg = OJB.getInstance();
secondOdmg = new OJB() {}.getInstance(); // anonymous class
Is this intended? If not, you can easily forbid it:
The only points where this protected constructor is
called are in the same package (OJBJ2EE_2, OJB), so
package visibility suffices.
Some backgound on why I am interested in that:
I want to build an application-server-like
thing that allows several clients to connect to the same
database. Like so many others, I am still wondering whether
to use PB or ODMG. At the moment, I favour ODMG, but
then it seems impossible to use several open DB connections
to that single database. Using the PB API seems not a good
idea either if I got Max' message in this weekend's thread
correctly ...
I have read the threads about "multiple Databases with ODMG",
(see
http://archives.apache.org/eyebrowse/ReadMsg?[EMAIL PROTECTED]
pach
e.org&msgNo=1945),
but there is no solution for that purpose.
Olli
P.S. thanks to all of you for the OJB 0.9.9 release.
--
Dr. Oliver Matz
ppi Media GmbH
Deliusstra�e 10
D-24114 Kiel
phone +49 (0) 43 1-53 53-422
fax +49 (0) 43 1-53 53-2 22
email mailto:[EMAIL PROTECTED]
web www.ppi.de
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