Some Dart Mixins I've been working on.

1loggingmixin.dart

library loggermixins;

import 'package:logging/logging.dart';
import 'dart:mirrors';

abstract class LoggerMixin {
  Logger _log;
  
  Logger get log {
    if( _log == null ) {
      InstanceMirror im = reflect(this);
      ClassMirror cm = im.type;
      _log = new Logger(MirrorSystem.getName(cm.simpleName) );
    }
    return _log;
  }
  
}

2jsonmixin.dart

library jsonmixins;

import "dart:mirrors";


abstract class JSONMixin {
  
  Map toJSON() { 
    Map map = new Map();
    InstanceMirror im = reflect(this);
    ClassMirror cm = im.type;
    var declarations = cm.declarations.values.where((d) => d is VariableMirror);
    declarations.forEach((d) {
      var key = MirrorSystem.getName(d.simpleName);
      var val = im.getField(d.simpleName).reflectee;
      map[key] = val;
    });

    return map;
  }  
  
  void fromJSON(Map data) {
    InstanceMirror im = reflect(this);
    ClassMirror cm = im.type;    
    for(var fieldname in data.keys) {
      Symbol field = new Symbol(fieldname);
      if( cm.declarations.containsKey(field) ) {
        im.setField(field, data[fieldname]);
      } else {            
        print("Warning, $fieldname was ignored during fromJson");
      }
    }
  }
  
  
}

3example.dart

import 'package:angular/angular.dart';
import 'jsonmixin.dart';
import '../util/loggermixin.dart';

class Game extends Object with JSONMixin, LoggerMixin {
  String key, url, created;
  int id;
  bool active;
  var trainer;
  var player;
  
  Http http;  
  
  Game(this.http, this.key) {       
  }
  
  
  void loadGame() {
    http.get("/api/games/$key/")
      .then((HttpResponse response) {        
        fromJSON(response.data);  
        log.info("Game loaded");
      },
      onError: (Object obj) {
        print(obj);
      });
  }
  
}