code: public <T> void set(String key, T value) {
  		Preconditions.checkArgument(key != null && !key.isEmpty(), "Parameter 'key' must not be [" + key + "]");
  		values.put(key, value);
  		scope.put(key, scope, value);
  	}
docs: Sets the specified configuration setting with the specified key.
  
  @param key The key to the configuration setting.
  @param value The value of the configuration setting.