code: function (cmd, callback) {
      if (!cmd || !_.isObject(cmd)) {
        var err = new Error('Please pass a valid command!');
        debug(err);
        throw err;
      }
  
      if (!callback || !_.isFunction(callback)) {
        var err = new Error('Please pass a valid callback!');
        debug(err);
        throw err;
      }
  
      var target = this.getTargetInformation(cmd);
  
      var commandHandler = this.tree.getCommandHandler(target);
  
      // if (!commandHandler) {
      //   commandHandler = this.tree.getCommandHandlerByOldTarget(target);
      // }
  
      if (!commandHandler) {
        var err = new Error('No command handler found for ' + target.name);
        debug(err);
        return callback(err);
      }
  
      if (!this.commandBumper) {
        return commandHandler.handle(cmd, callback);
      }
  
      var key = target.context + target.aggregate + target.aggregateId + dotty.get(cmd, this.definition.id);
  
      this.commandBumper.add(key, function (err, added) {
        if (err) {
          return callback(err);
        }
  
        if (!added) {
          return callback(new DuplicateCommandError('Command already seen!'));
        }
  
        commandHandler.handle(cmd, callback);
      });
    }
docs: Dispatches a command.
  @param {Object}   cmd      The passed command.
  @param {Function} callback The function, that will be called when this action is completed.
  `function(err, evts){}`