cn.sliew.milky.common.settings

接口 SettingUpdater<T>

类型参数:

T - the type of the value of the setting

public interface SettingUpdater<T>

Transactional interface to update settings. 如何进行两段式提交？？？

另请参阅:

Setting

方法概要

限定符和类型	方法和说明
default boolean	apply(Settings current, Settings previous) Updates this updaters value if it has changed.
void	apply(T value, Settings current, Settings previous) Applies the given value to the updater.
Setting<T>	getSetting()
T	getValue(Settings current, Settings previous) Returns the instance value for the current settings.
boolean	hasChanged(Settings current, Settings previous) Returns true if this updaters setting has changed with the current update.
default Runnable	updater(Settings current, Settings previous) Returns a callable runnable that calls apply(Object, Settings, Settings) if the settings actually changed.

方法详细资料

getSetting

Setting<T> getSetting()

hasChanged

boolean hasChanged(Settings current,
                   Settings previous)

Returns true if this updaters setting has changed with the current update.

参数:

current - the current settings

previous - the previous setting

返回:

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.

返回:

true iff the value has been updated.

updater

default 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.