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From Benjamin Tomasini <btomas...@neteverything.com>
Subject RE: [HiveMind] Force loading of Services
Date Fri, 26 Mar 2004 00:57:46 GMT
You will see errors in LOG.error, but not in the form of an exception. 
Which, IMO, is kinda dangerous as you get half-baked services. 
Specifically,

1. <set-service> in BuilderFactory can fail and the end result is that
you get a null for that dependancy - though the service is not null.
2. Initializable.initializeService() does not throw an exception.


I do think it is counter-productive to have the option to pre-load
services.  It seems like that misses the point of HiveMind.  But... in
light of the two issues above, the reality is that we only have
LOG.error to tell us of the error, and I may want to know ASAP if any of
these error occurred.  Lesser of two evils?  Dunno.  


On Wed, 2004-03-24 at 12:24, Howard M. Lewis Ship wrote:
> I'm unconvinced this is necessary. I would tend to think that it is counter-productive.
With late
> building of services (behind proxies), you will see error messages related to the construction
of a
> service just where methods are first invoked on it. With the discussion of forced loading
of
> services, you will see all errors for all services in one ungainly clump.
> 
> --
> Howard M. Lewis Ship
> Independent J2EE / Open-Source Java Consultant
> Creator, Tapestry: Java Web Components 
> http://howardlewisship.com
> 
> 
> > -----Original Message-----
> > From: Christian Essl [mailto:christianessl@yahoo.de] 
> > Sent: Tuesday, March 23, 2004 5:49 AM
> > To: commons-dev@jakarta.apache.org
> > Subject: [HiveMind] Force loading of Services
> > 
> > 
> > A few days ago Benjamin had mainly the complain about the 
> > current service 
> > handling, that problems in the service construction may arise 
> > very late 
> > during runtime. While we discussed very lenghty why this is 
> > so in Hivemind 
> > I somehow share his whishes that it should be possible to get 
> > an exception 
> > either at Registry build time or at first access for at least special 
> > marked services.
> > 
> > Maybe it could help if the Registry had a method 
> > getLoadedService() this 
> > method would instruct (via the ServiceExtensionPoint) the 
> > Model to load a 
> > deffered Proxy. An alternative would be to add to the services a 
> > mixin-interface which has a load() method and would just load 
> > the proxy.
> > 
> > To enable checking at Registry build time 
> > service-implementations could be 
> > marked to be loaded at start-up. This could happen with an 
> > extra attribute 
> > 'load-at-startup'. Again an alternative would be to have start-levels 
> > (OSGi like). This would also help to start timers etc.
> > 
> > -- 
> > Christian Essl 
> > 
> > ---------------------------------------------------------------------
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> > 
> 
> 
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-- 
Benjamin Tomasini
NetEverything, Inc.
1-877-270-1391


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