RE: UC: Configuration Injection (SE)

[Tresch, Anatole]

See inline...



-----Original Message-----
From: Romain Manni-Bucau [mailto:rmannibu...@gmail.com]
Sent: Donnerstag, 18. Dezember 2014 09:21
To: dev@tamaya.incubator.apache.org
Subject: Re: UC: Configuration Injection (SE)



using pseudo code to make it shorter:



public class MyConfig {

    @Config(...)

    @Codec(deserializer = JSonDeserializer.class, serializer =

JSonSerializer.class)

     MySubConfig sub;

}



config could then be foo = {"a":"b",...} and MySubConfig = { String b;... }.



Until now nothing needing all this stuff but now suppose I modify sub

during app lifecycle, how do I store modifications?



What I would avoid is to 100% rely on impls (ie I cast my Source and

use its store method for instance).



-> +1 if we want this feature to be offered, it should be supported by the 
API...



Would be great to be symmetric :)

-> I would also start think about how to include this feature as part of the 
API. My ideas currently are as follows



0) a Codec implements two functional interfaces: ConfigSerializer, 
ConfigDeserializer (or encoder/decoder? )



1) Offer creation of a Configuration using a Codec, e.g.



  String jsonOrWhatever = ...;

  Codec codec = ...;

  Configuration config = Configuration.of(jsonOrWhatEver, codec); // takes a 
deserializer



and with templates:



  String jsonOrWhatever = ...;

  Codec codec = ...;

  Configuration config = codec.decode(jsonOrWhatEver); // takes a deserializer

 MyConfig config = Configuration.of(MyConfig.class, config); // signature 
public static <T> T of(Class<T> template, Configuration... configs);



and



  Codec codec = ...;

  Configuration config = ...;

  String jsonOrWhatever = codec.encode(config);   // a serializer

// or in addition, when serializer extends ConfigQuery<String>

  String jsonOrWhatever = config.query(encoder);





and



  Codec codec = ...;

  MyConfig config = ...;

  String jsonOrWhatever = codec.encode(config);



WDYT?



Anatole