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From: "Andreas Hjortsberg" <andreas.hjortsberg@x-change.se>
Subject: Re: Docs and some questions
In-Reply-To: 11571CC9-0645-472F-A34B-F495EB0F9D1C@objectstyle.org
Message-ID: <20061113183237.f7fc60f5@mail.x-change.se>
Date: Mon, 13 Nov 2006 19:32:37 +0100
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Hello and thank you all for your replies.
Yes, you are correct Andrus, my intentions are to use an ordinary dataCo=
ntext, and the reason is that my application must be able to work offlin=
e.

I looked through the code regarding JavaGroupBridge and it seems to me t=
hat it is a quite straight forwarard to
get two or more  applications to talk to each other over a local network=
, and the different datacontext will be updated etc.. =20
The more diffucult thing to implement will be to add some logic to commi=
t the changes on the remote dataContexts to=20
their local databases.

In the perfect world I don't need to care about it, because the remote c=
ontext  will be updated, and next time someone commit the changes on the=
ir
datacontext the local database will update on a correct manner, but if a=
 user refresh the data before it comes comitted I=20
will lose the changes to this datacontext.

Now to my question; where should any of you add this logic=3F One could =
make sure that the client application always commits changes before he d=
oes=20
anything. It does not feel like a good solution, though. Another approch=
 would be to add another static datacontext for the application, which w=
ill commit after any event has been received through the JavaGroupBridge=
=3F


Regards
/Andreas


> As Ari just mentioned, JGroups site is located here:
>=20
> http://www.jgroups.org
>=20
> Cayenne has built in support for using JGroups as a provider for =20
> cache synchronization. You can configure it in the Modeler:
>=20
> * Check "Remote Change Notifications" for the DataDomain
> * Click the "Configure" button next to it and enter the settings that =
=20
> you need (or leave the defaults).
>=20
> And of course you can use JavaGroupsBridge for your own custom =20
> messaging if you need functionality beyond just cache synchronization.
>=20
> Andrus
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>=20
> On Nov 11, 2006, at 9:15 AM, Andreas Hjortsberg wrote:
> > Hello,
> >
> > In  the api docs for
> >
> > JGROUPS=5FCONFIG=5FURL=5FPROPERTY
> >
> > http://incubator.apache.org/cayenne/2=5F0/api/cayenne/index.html
> >
> > there is an invalid link for an example file. I think it's Filip's =
=20
> > son who shows up, very cute though.
> >
> > http://www.filip.net/javagroups/javagroups-protocol.xml
> >
> > Is there anyone who knows where I can find another example=3F
> >
> > I'm about to start a project where all clients will have a local =20
> > swing application and database, probably derby or hsqldb.
> > It is very important what then a client change some of his objects =
=20
> > it is broad casted over the local subnet and the other clients will =
=20
> > be updated and it also notifies a main server.
> >
> > Has anyone used cayenne and jgroups for this=3F Is it the path to =
=20
> > take=3F I have looked around but have not found any example or =20
> > comments on this. Or is the existing integration between jgroups =20
> > and cayenne designed to mainly work between instances on a  web =20
> > application=3F
> >
> > Regards
> > /Andreas
> >
> >
>=20
>=20
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