Interface AbstractScopedSettings.SettingUpdater<T>

  • Type Parameters:
    T - the type of the value of the setting
    Enclosing class:

    public static interface AbstractScopedSettings.SettingUpdater<T>
    Transactional interface to update settings.
    See Also:
    • Method Detail

      • hasChanged

        boolean hasChanged​(Settings current,
                           Settings previous)
        Returns true if this updaters setting has changed with the current update
        current - the current settings
        previous - the previous setting
        true if this updaters setting has changed with the current update
      • getValue

        T getValue​(Settings current,
                   Settings previous)
        Returns the instance value for the current settings. This method is stateless and idempotent. This method will throw an exception if the source of this value is invalid.
      • apply

        void apply​(T value,
                   Settings current,
                   Settings previous)
        Applies the given value to the updater. This methods will actually run the update.
      • apply

        default boolean apply​(Settings current,
                              Settings previous)
        Updates this updaters value if it has changed.
        true iff the value has been updated.
      • updater

        default java.lang.Runnable updater​(Settings current,
                                           Settings previous)
        Returns a callable runnable that calls apply(Object, Settings, Settings) if the settings actually changed. This allows to defer the update to a later point in time while keeping type safety. If the value didn't change the returned runnable is a noop.