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State mode: Pay attention to encapsulating state-related behaviors, support state changes, and change its behavior when its internal state changes by encapsulating object state.Synchronous Event Demultiplexer: It is itself a system call that waits for one or more events to occur. The caller will be blocked when calling it until an event is generated on the synchronous event separator. For Linux, synchronous event splitter refers to common I/O multiplexing mechanisms, such as select, poll, epoll, etc. In the Java NIO domain, the corresponding component of the synchronous event separator is the Selector; The corresponding blocking method is the select method.Good-looking, continue to be more《行医》讲述的是两名性格以及治疗方法都千差万别的医者的故事。一个中医和一个西医虽有竞争却注定走的是不同的道路。然而在他们之间激烈竞争开始的时候都被牵扯到了一个复杂的医疗案件之中。　　影视新人白静，一个熟悉又陌生的名字，她造就了一个戏未出人先红的神话。湖南卫视暑期下一季即将推出投资2000万的自制大戏《血色湘西》，白静正是著名的龚智飞导演从众多演员里挑选出来挑起大梁，女一号“穗穗”的扮演者。熟悉网络的朋友早已熟悉了白静这个名字，早已经熟悉了她那张清新漂亮的脸，早已经熟悉了湘西山顶美丽的苗家姑娘的扮相和她英武的军资。在摩托车竞技场上，一位玉树临风的车手站在那里，刺激危险的游戏是他的快乐源泉。车手帕亚拉喳（siwadchodchaicharin）成功地越过火堆和所有障碍物，场边时尚的人群都欢呼着，所有美女都蜂拥进赛场，只为得到车手的青睐……In the case of a reflection attack, An attacker uses a controlled host to send a large number of packets, What makes these packets special is that, The destination IP address points to the server, router, and other facilities that act as reflectors, while the source IP address is forged as the target IP address, When the reflector receives the data packet, it will think whether the data packet is requested by the attack target, so it will send the corresponding data to the attack target. When a large number of response data packets flock to the attack target, it will deplete the network broadband resources of the target, resulting in denial of service attacks.