public interface Refreshable
Subject
boolean isCurrent()
Object
是否是当前的。
Object
是当前的,则为true,否则为false。
void refresh() throws RefreshFailedException
Object
的有效期。
SecurityException
- 如果来电者没有权限更新或延长此
Object
的有效期。
RefreshFailedException
- 如果刷新尝试失败。
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