URLSelectorStrategy

[genman]

Re: http://wiki.jboss.org/wiki/Wiki.jsp?page=JBossJCADatabaseFailover

I'd like to slightly refactor the ha-local-rar stuff so that it can support more than just "sticky round-robin"; the use case being to share the load across multiple read-only databases.

The obvious way to extend HA would be to add an additional configuration key that either indicates a Java class to use (implementing, say, URLSelectorStrategy) or some sort of general configuration value set, e.g. "SRR", "RR".

One complication I see is both XA and non-XA have their own URLSelector implementations. (This I think can be easily fixed.)

If I could solicit your opinion on what the configuration names and class layout should be, I can take a stab at it.

I also don't see any unit tests for this functionality in HEAD -- are there any?

[weston.price]

This is actually slated for rework

http://www.jboss.com/index.html?module=bb&op=viewtopic&t=91493

So, basically we want to move the HA stuff into the regular adapters and have it as a configuration option. And yes, there is quite a bit of useless duplicated code. By all means take a crack at it. It doesn't have to be perfect from the outset. I can take a look when you have something concrete.

[genman]

So, should I go ahead and modify the non-HA classes? How would you suggest the multiple URL mechanism work for these? I think the URL delimeter thing is cheesy myself.

[weston.price]

What I would do is start with the HA stuff now and then we can integrate into the mainline for the JIRA task. I like the SelectorStrategy idea, however, the delimeter will still have to remain as there is no way to really tell the JCA stuff what constitues a DB url unless we modified the *-ds.xml format to support a list of of Url's or something like that.

[weston.price]

Hey genman,
What are your plans for this? Do you still want to handle this? If so, where are you on it?

[vickyk]

Hey Weston
I am taking this from here .
I will make the changes in the head as you have pointed here
http://jira.jboss.org/jira/browse/JBAS-3707

[genman]

Weston: Sorry I didn't get to it. It was likely we'd be using JBoss for some project of ours which required this feature, but Weblogic is here to stay at Autodesk.