Hi Ceki! On Thu, Jun 20, 2013 at 11:13 PM, ceki <ceki@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