Re: [xmlblaster-devel] LOCAL not working?

[Peter Antman <pra at mint.se>]

On Thu, 2003-09-18 at 10:34, Marcel Ruff wrote:
> Peter Antman wrote:
> > Hi again,
> > I have also done some changes to the JXM/Embedded/JBoss service, which
> > makes it possible for clients running in the same JBoss/JMX server to
> > get access to the serverside engine global, and as an effect of that is
> > able to use the LOCAL in vm protocol.
> 
> Yep.
> 
> > 
> > This is done through JNDI.
> > 
> > The embedded service creates a utility class (GlobalUtil) which holds
> > the engine global:
> > 
> >       if ( jndiName != null) {
> >          bind( blaster.getMain().getGlobal() );
> >       } // end of if ()
> > 
> > private void bind(org.xmlBlaster.engine.Global engineGlobal) throws
> > Exception{
> >       if ( jndiName == null) {
> >          return;
> >       } // end of if ()
> >       
> >       // Do we have JNDI at all?
> >       Context ctx = null;
> >       try {
> >          ctx =  new InitialContext();
> >       } catch (NamingException e) {
> >          throw new IllegalStateException("No NamingContext available,
> > trying to run with a jndiName in a server withouth jndi is not valid:
> > "+e);
> >       } // end of try-catch
> >       
> >       GlobalUtil gu = new GlobalUtil(engineGlobal);
> >       bind(ctx,jndiName,gu);
> > 
> >    }
> > 
> > The GlobalUtil holds the engine.Global as a transient variable, which
> > means that if its not serialized (looked up in the same VM) it will be
> > accessable by the client doing the lookup. The client then uses the
> > GlobalUtil to hanlde its global creation and cloning, so that
> > engine.Global will be put in its objectEntry:
> > 
> >    public Global newGlobal(String propertyFileName, Properties args)
> > throws IllegalStateException {
> >       Global glob = new Global(new String[]{},false,false);
> >       Global clone = getClone(glob);
> >       addEngineProperties(clone);
> >       addServerProperties(clone);
> >       loadPropertyFile(clone,propertyFileName);
> >       addArguments(clone,args);
> >       return clone;
> >    }
> > 
> >    public Global getClone(Global global) {
> >       Global g = global.getClone(null);
> >       
> >       Object engine = global.getObjectEntry("ServerNodeScope");
> >       Object eg = engine != null ? engine : engineGlobal;
> >       if ( eg != null) {
> >          g.addObjectEntry("ServerNodeScope", eg);
> >       } // end of if ()
> >       
> >       // Should we perhaps also clone POA???
> > 
> >       return g;
> >    }
> > 
> > Here's how for example the JCA adapter uses this:
> > 
> >       globalUtil = new GlobalUtil();
> >       if ( jndiName != null) {
> >          try {
> >             globalUtil = (GlobalUtil)new
> > InitialContext().lookup(jndiName);
> >          } catch (NamingException e) {
> >             throw new IllegalStateException("Could not lookup GlobalUtil
> > with JNDI " + jndiName + ": "+e);
> >          } // end of try-catch
> >       } // end of if ()
> > 
> >       glob = globalUtil.newGlobal( propFile,
> > glob.getProperty().getProperties() );
> > 
> > This means that if a JNDI name is specified and the lookup is done in
> > the same VM as the process that bound the GlobalUtil into jndi, the
> > global the JCA adapter uses will be able to use a LOCAL protocol to
> > access the server.
> > 
> > Any complaints about this design?
> 
> Cool! Exactly what we need.
> Is there a way to implement an automatic testsuite to check all this?

Not that I know of. It would require us to have a JBoss in the
XmlBlaster distro.

> This way all developers are forced to look at issues if this
> framework fails in future xmlBlaster versions.
> I think its the only way to keep this framework alive
> over all versions in future.

I agree, but see no way of fixing that now. If we do not use XmlBlaster
as the container also for the standalone XmlBlaster (which I actually
think would be a rather good idea, at least the minimal JMX part, and
perhaps with JCA and JNDI).

//Peter
> 
> regards
> 
> Marcel
> > 
> > //Peter
> > 
> 
> 
> -- 
> http://www.xmlBlaster.org
-- 
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Peter Antman	Chief Technology Officer, Development
Technology in Media, Box 34105 100 26 Stockholm
WWW: http://www.tim.se	WWW: http://www.backsource.org
Email: pra at tim.se	 
Phone: +46-(0)8-506 381 11 Mobile: +46-(0)704 20 58 11
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