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The best way to conform to the opening and closing principle is to provide an inherent interface, and then let all classes that may change implement the interface, allowing fixed interfaces to interact with related objects.Note that in the improved version of the above figure, so I/O operations are still performed by a Reactor, including accept (), read (), write (), and connect () operations of I/O.距今2000年前，高句丽开国之君朱蒙之子琉璃王即位，其时高句丽外受强国扶余窥伺，内因对王权虎视眈眈的沸流部而政局混乱，尽管如此，琉璃王仍常怀着高句丽强国之梦。Original address: http://www.cnblogs.com/zhili/p/SingletonPatterm.html讲述的是沦落于街头的各色人物，为了抢夺一个装着一袋子枪和一捆捆钱的高尔夫球袋而接连引发多种事件的故事。His short adventure for their help: Lanlan (plant-dyeing team head at our shop), Lekui (text and photograph) and Solav (translation and revision)在尾谷高中上学的岚山步鸟（小见川千明 配音），是SEASIDE的女仆一号。她的同班同学辰野俊子（悠木碧 配音）因为对常来店里的真田广章怀有好感，于是也成为咖啡厅的女仆二号。因为学校规定学生不能私自打工，她们的班主任森秋夏彦，来到店里阻止她们打工，最后却不了了之，反而成为咖啡厅常客之一。之后的某一天，步鸟在街上偶遇了学姐绀双叶，二人成为朋友。《女仆咖啡厅》就是以步鸟所在的小镇为背景，围绕着她和她身边的朋友而展开，在这家看起来有点寒酸的女仆咖啡厅里，发生了很多轻松搞笑的小故事……