[logback-dev] [discuss] a new (prototypal) approach to Joran configuration

[Simone Tripodi]

Hi again Ceki,

with last push[1] I accomplished to obtain the current configuration format.

HTH!
Best,
-Simo

[1] https://github.com/simonetripodi/logback/commit/f817756ee1a1a51a5e3001f7642bb9dfbaf54061

http://people.apache.org/~simonetripodi/
http://twitter.com/simonetripodi


On Fri, Jun 21, 2013 at 10:20 AM, Simone Tripodi
<simonetripodi at apache.org> wrote:
> Hi Ceki!
>
> On Thu, Jun 20, 2013 at 11:13 PM, ceki <ceki at qos.ch> wrote:
>> On 20.06.2013 09:44, Simone Tripodi wrote:
>>>
>>> Hi Ceki/all!
>>>
>>> due to my recent involvement in Modello[1], I started experimenting
>>> how the Modello approach could benefit existing projects that require
>>> to parse XML (but also JSON and YAML) configurations, and took Logback
>>> as a good example where doing some experiments...
>>>
>>> What made me curious to made that experiment, is the fact that current
>>> Joran approach is based to SAX APIs + reflection - elements are
>>> introspected at runtime and components will be injected - while the
>>> Modello approach is based on streaming APIs and introspection analysis
>>> is performed at compile-time, generating the "parse-tree" and the
>>> (un)marshallers.
>>
>>
>> Is there introspection support in Modello?
>>
>
> Nope, unfortunately :( it generates readers/writers that just invoke
> plain old setters/getters/adders for generated models, but that is why
> maybe is efficient.
>
>>
>>> So, I pushed an initial/prototypal logback-joran2 module in my
>>> personal fork[2], which APIs are not integrated with the rest of the
>>> project yet.
>>>
>>> Configuration elements are defined in the Modello descriptor[3] which
>>> enable the generation of Java APIs (included inner Builders/static
>>> utility methods), the XML Reader/Writer (based on StAX APIs) and the
>>> XSD that users could integrate in their preferred XML IDE in order to
>>> enable the validation and auto-complete editing.
>>> With that approach, users can create their configurations
>>> programmatically, for free.
>>
>>
>> That's just awesome!
>>
>>
>>> Final format is a little different to the current one, have a look to
>>> a sample[4] generated via these APIs, but I am working to keep the
>>> original format as much as I can.
>>
>>
>> Are there any hooks in Modello to support setting component properties, e.g.
>> appender properties? (It's a quasi-repeat of earlier question about
>> introspection in Modello.)
>>
>>
>>> Have a look also at how simple would be reading and writing
>>> configurations.
>>>
>>> WDYT?
>>
>>
>> I think that Modello has some very interesting features which are
>> lacking in Joran. Had I known about Modello earlier, I would probably
>> have not written Joran in the first place.
>>
>
> may I can kindly ask you to point me to the current XML schema for
> Joran configuration? Once complete, I think you could evaluate an
> experimental Joran2 module - which can co-live nicely with existing
> Joran...
>
> All the best,
> -Simo
>
> http://people.apache.org/~simonetripodi/
> http://twitter.com/simonetripodi