7 messages in org.apache.commons.devRE: java.util.Service| From | Sent On | Attachments |
|---|---|---|
| Jörg Schaible | Mar 9, 2006 4:59 am | |
| Craig McClanahan | Mar 9, 2006 9:03 am | |
| Simon Kitching | Mar 9, 2006 12:36 pm | |
| Jörg Schaible | Mar 9, 2006 12:56 pm | |
| Jörg Schaible | Mar 9, 2006 11:29 pm | |
| Jörg Schaible | Mar 10, 2006 12:07 am | |
| robert burrell donkin | Mar 11, 2006 3:07 am |
| Subject: | RE: java.util.Service | |
|---|---|---|
| From: | Jörg Schaible (Joer...@Elsag-Solutions.com) | |
| Date: | Mar 9, 2006 11:29:30 pm | |
| List: | org.apache.commons.dev | |
Simon Kitching wrote on Thursday, March 09, 2006 9:37 PM:
On Thu, 2006-03-09 at 09:04 -0800, Craig McClanahan wrote:
On 3/9/06, Jörg Schaible <Joer...@elsag-solutions.com> wrote:
Hi folks,
do we have something like the java.util.Service class introduced with JDK 1.6 withing Jakarta? This is basically a proper API to access the Service Provider mechanism described here:
http://java.sun.com/j2se/1.4.2/docs/guide/jar/jar.html#Service %20Provider
The closest analog is probably the "Commons Discovery" package, which utilizes a variety of strategies to do service discovery (including, IIRC, the META-INF service lookup trick).
As it happens, I've just implemented Service functionality as part of a JCL 2.x experimental prototype (including unit tests). You're welcome to the code..
http://svn.apache.org/repos/asf/jakarta/commons/proper/logging /contrib/simon/jcl2/core/java/org/apache/commons/logging/Utils.java
http://svn.apache.org/repos/asf/jakarta/commons/proper/logging /contrib/simon/jcl2/core/
Regretfully I don't have a lot of confidence in the commons-discovery code. There are *so* many weird classpath-related situations that can occur inside containers that any code of more than trivial complexity is almost certain to be wrong in some circumstances. If you want Service support, I would recommend *just* implementing Service support rather than using commons-discovery.
Well, I've found now that discovery also implements this service:
http://jakarta.apache.org/commons/discovery/commons-discovery-0.2/docs/api/org/apache/commons/discovery/tools/Service.html
I wonder anyway, why we don't try to consolidate discovery, if it makes all this
trouble (wondering why we have a 0.2 released project in proper) ...
- Jörg