using ODMG as a singleton

[Will Jaynes <ja...@umich.edu>]

Is it proper to use ODMG as a singleton in my web application? I have 
the following class (brief version) that gets the ODMG Implementation 
object once, and opens the database once. From then on I simply call 
OjbDAOFactory.getODMG().

Is this a safe and proper way to do things? If not, what would be a 
better usage?  Thanks.


public class OjbDAOFactory
{
     static Implementation odmg;
     static Database db;
     static {
         try {
             odmg = OJB.getInstance();
             db = odmg.newDatabase();
             db.open("default", Database.OPEN_READ_WRITE);
         } catch (ODMGException ex) {
             LOGGER.error("", ex);
         }
     }
     public static Implementation getODMG()
     {
         return odmg;
     }

Re: using ODMG as a singleton

[Armin Waibel <ar...@code-au-lait.de>]

Hi Will,

----- Original Message -----
From: "Will Jaynes" <ja...@umich.edu>
To: "OJB Users List" <oj...@db.apache.org>
Sent: Friday, March 07, 2003 3:37 PM
Subject: using ODMG as a singleton


> Is it proper to use ODMG as a singleton in my web application? I have
> the following class (brief version) that gets the ODMG Implementation
> object once, and opens the database once. From then on I simply call
> OjbDAOFactory.getODMG().
>
> Is this a safe and proper way to do things?

I don't see any problems (as long as only
one Database was used).

regards,
Armin

> If not, what would be a
> better usage?  Thanks.
>
>
> public class OjbDAOFactory
> {
>      static Implementation odmg;
>      static Database db;
>      static {
>          try {
>              odmg = OJB.getInstance();
>              db = odmg.newDatabase();
>              db.open("default", Database.OPEN_READ_WRITE);
>          } catch (ODMGException ex) {
>              LOGGER.error("", ex);
>          }
>      }
>      public static Implementation getODMG()
>      {
>          return odmg;
>      }
>
>
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