Hi Stuart,
Thanks...this is great. Just for my and others info, how much code is
pax?
well 'pax' is an umbrella project that covers all things OSGi at
www.ops4j.org( ie. logging and http services, provisioning with pax-runner, building projects
with pax-construct, dynamic modular wicket with pax-wicket, etc, etc... )
the 'pax-logging-api bundle' is not trivial, but it is really just the logging APIs for
log4j, commons, slf4j, avalon, knopflerfish, osgi and it's own API - plus a couple
of factory classes
the API bundle in total is around 57k, but it can replace any major logging API jar
that you might already have on your classpath, so you may find you save space.
For the time being my trivial class is just 2500 bytes, so as 'last
ditch' (i.e. if pax or no others are available) it works OK but having
something like pax as part of equinox impl would be nice.
FYI, it also works well with other OSGi frameworks, such as Knopflerfish and Felix.
Scott
Stuart McCulloch wrote:
On 09/10/2007, Scott Lewis
<slewis@xxxxxxxxxxxxx>
wrote:
Thanks Niclas.
I'm really looking for something much more trivial than Pax logging
:)...so for the time being I implemented LogService myself.
But thanks for the info, I may very well use Pax logging in the future.
One question: what does the Pax logging API bundle depend upon? (i.e.
extension registry?, others?).
The Pax-Logging API bundle only has dependencies on the execution
environment (ie. it needs
the javax.xml.parsers and org.w3c.dom packages) and on the OSGi
framework itself (only the
org.osgi.framework, org.osgi.service.event and org.osgi.util.tracker
packages).
It uses the OSGi service registry, rather than the Eclipse extension
registry.
HTH
Scott
Niclas Hedhman wrote:
On Tuesday 09 October 2007 04:28, Scott Lewis wrote:
Is there any existing LogService implementation that just prints to
System.out/System.err...that is in a bundle present for *all* Equinox
impls (not just Eclipse)?
Equinox in its purest form has no bundles in it besides the system bundle, and
IIRC the internal Equinox logger is not exposed.
That is, is there some basic LogService that can be used as a last-ditch
logging mechanism (if no other LogService is available)?
Pax Logging attempts to provide both OSGi Log Service functionality as well as
bridging of third-party legacy APIs such as;
JDK Logging
Log4J
Jakarta Commons Logging
Avalon Logging API
SLF4J
KnopflerFish Log
Pax Logging consists of 2 bundles. The API bundle must always be present and
is what all the legacy code will 'bind' into when they lookup a logger the
respective way. The Service bundle can come and go to allow for upgrade of
the Log4J driven bakend, without taking down the entire application.
When the Service is not available, the API will revert to System.out (a
buffering version is under construction).
You find Pax Logging at OPS4J,
http://wiki.ops4j.org
Cheers
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Cheers, Stuart
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