util
Interface ConditionalRefreshing

All Superinterfaces:

Refreshing

All Known Implementing Classes:

ImageCache, JAntarcticaNight, JBaycamMosaic, JEarthNight, JFrameParameter, JNight, JTargetTable.JRefreshScrollPane

public interface ConditionalRefreshing
extends Refreshing

This interface allows implementing methods to decide whether an update of their state is currently needed. Additionally to Refreshing they provide a method isRefreshNeeded() that is called without any arguments and should return a boolean that is true, if the refresh should commence.

Method Summary

boolean

isRefreshNeeded() Returns a method that is called on each scheduled refresh.

Methods inherited from interface util.Refreshing

getRefreshInterval, isFixedRate, refresh

Method Detail

isRefreshNeeded

boolean isRefreshNeeded()

Returns a method that is called on each scheduled refresh. It must be a method without any argument that returns a primitivie boolean. If the answer is false, the current refresh task is abort, i.e. the timer task's run method returns immediately. This is intended for Refreshing objects with high loads on update that might skip a single refresh, if their current state is of no importance. Examples could be components that want to redraw themselfes only when visible.