Apple

Unfortunately (or fortunately, depending on how you look at it :) ), you need to drink the Wonder koolaid to use ERXJGroups notification. This is one that is very hard to do properly without hackery and a lot of the Wonder tricks depend on eachother -- especially down in EOF. I would be very hesitant recommending that you pull it apart, because you're just going to run into nasty problems. You likely need to commit to using ERXEC, ERXModelGroup, etc. So while you're not going to necessarily gut your app, adding this ability to an existing non-Wonder app is definitely going to require some work.

The basic rules still apply -- extend ERXApp, extend ERXSession, and use ERXEC.newEditingContext instead of new EOEditingContext, but with an existing app, you are just a lot more of these to find and a lot more testing to do (for instance, with a big existing app, you might find that you already have delegates on things that Wonder requires being a delegate for).

We've been using the ERXJGroups notification in our non-WOnder app without issues for a while now. The only issue we've been having is with JGroups itself and concurrent restart of some of our app instances.

I do remember though that I had to dive deep into WOnder to figure out all the dependencies and load order to make it work.

I suspect the reason why we haven't seen any issues yet is because we pretty much have all the editing context "fixes" that WOnder's ERXEC does and we don't have conflicts with delegates since don't setup our own delegates for anything.

The code that is used to initialise ERXJGroups is:

EODatabaseContext.setContextClassToRegister( ERXDatabaseContext.class );

/* initialise the synchronizer */

ERXObjectStoreCoordinatorSynchronizer.initialize();

This code is executed early on in the application loading (actually in the framework's principal class) before any model is loaded. Also, it uses an old version of WOnder (the latest one at the time I did this).

Regards

Peter Vandoros
Software Engineer
Etech Group Pty Ltd
Level 3/21 Victoria St
Melbourne VIC 3000
Australia

Ph: +61 3 9639 9677
Fax: +61 3 9639 9577
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References:
	>How to use ERJgroupsSynchronizer framework without Wonder? (From: Dov Rosenberg <email@hidden>)
	>Re: How to use ERJgroupsSynchronizer framework without Wonder? (From: Mike Schrag <email@hidden>)