Update on j3

[Jukka Zitting <ju...@gmail.com>]

Hi,

The level of activity on the j3 sandbox has been pretty nice in the
past few weeks. Would someone working on the code care to give a short
update on the latest developments? The commit messages have been
rather terse for now...

BR,

Jukka Zitting

Re: Update on j3

[Michael Dürig <md...@apache.org>]

Hi,

>> The level of activity on the j3 sandbox has been pretty nice in the
>> past few weeks. Would someone working on the code care to give a short
>> update on the latest developments? The commit messages have been
>> rather terse for now...
>
> the goal is to have a working spi-based stack with the microkernel underneath
> (jcr2spi->spi2mk). such a stack would serve us as a POC for the technical
> viability of a MVCC-based microkernel approach. furthermore it would allow
> to benchmark the mk-based stack against jackrabbit-core and jcr2spi->spi2jcr.

To get an idea on how far this has been progressed, have a look at the 
pom [1]. I just enabled the TCK test suite for the default build. The 
pom lists the known issues and their reasons. All known issues which 
have a fixme tag in the comment should be fixed. The other ones are 
currently 'as designed' i.e. limitations which we deem acceptable for 
the prototype at its current state.


> one thing we've learned so far is that the spi abstraction layer probably needs
> to be largely re-written/re-designed in order to fully take advantage of a
> MVCC-based microkernel.

That's why I branched jcr2spi, spi and spi-commons. The idea is to 
evolve these into the new architecture where possible and rewrite where 
necessary. There has no real work been done in this area. My large 
commit [2] from today was just syntactical cleanup.

Michael

[1] 
http://svn.apache.org/viewvc/jackrabbit/sandbox/jackrabbit-mk/jackrabbit-spi2microkernel/pom.xml?view=markup
[2] http://svn.apache.org/viewvc?view=revision&revision=1164026



>
> cheers
> stefan
>
>>
>> BR,
>>
>> Jukka Zitting
>>

Re: Update on j3

[Stefan Guggisberg <st...@gmail.com>]

hi jukka

On Thu, Sep 1, 2011 at 2:11 PM, Jukka Zitting <ju...@gmail.com> wrote:
> Hi,
>
> The level of activity on the j3 sandbox has been pretty nice in the
> past few weeks. Would someone working on the code care to give a short
> update on the latest developments? The commit messages have been
> rather terse for now...

we're still at a very early stage and the code base is still far from
stabilizing.
we're experimenting with different ideas/approaches which sometimes get
discarded soon after (much like in a proper sandbox ;). that's why commit
msgs might be terse at times.

the goal is to have a working spi-based stack with the microkernel underneath
(jcr2spi->spi2mk). such a stack would serve us as a POC for the technical
viability of a MVCC-based microkernel approach. furthermore it would allow
to benchmark the mk-based stack against jackrabbit-core and jcr2spi->spi2jcr.

one thing we've learned so far is that the spi abstraction layer probably needs
to be largely re-written/re-designed in order to fully take advantage of a
MVCC-based microkernel.

cheers
stefan

>
> BR,
>
> Jukka Zitting
>