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For example, in Java, the Selector's select () method is used to implement this synchronous blocking operation waiting for an event to occur. In the implementation of select () under Linux operating system, a) will call epollCtl (epfd, opcode, fd, events) to register the events that have been registered in Initiation Dispatcher into Linux system, where fd means Handle and events means Handle events that we are interested in; B) Synchronize the occurrence of a blocked wait registered event by calling the epollWait method. Events on different event sources may occur at the same time. Once an event is triggered, the epollWait method will return. C) Finally, find the associated SelectorKeyImpl object by the event that occurred, set the event that occurred to the ready state, and then put the SelectorKeyImpl into the selectedSet. In this way, we can get the event-ready SelectorKeyImpl collection through the Selector.selectedKeys () method.If a service needs to be public-oriented, it needs to provide a user access interface. These interfaces just give hackers the opportunity to take advantage of them. For example, the TCP/IP protocol handshake defect can be used to consume the link resources of the server, The stateless mechanism of UDP protocol can be used to forge a large number of UDP data packets to block communication channels... It can be said that the world of the Internet has not lacked attack points exploited by DDoS since its birth, from TCP/IP protocol mechanism to CC, DNS and NTP reflection attacks, and what's more, it uses various application vulnerabilities to launch more advanced and accurate attacks.然后，秦枫又问他们三人这几年过得如何。一定一定。父母是树，子女是藤。母亲有三个儿子一个女儿，因为父亲因病早逝，她便成了子女们唯一围绕的树。今年的春节和母亲的生日正好凑到了一起（母亲过阴历的生日），三个儿子便带着自己的媳妇或女友回到了老家与母亲团聚。小女儿小四则始终陪伴在母亲的身边，她和男朋友陈松负责接待着哥哥嫂子们。在一家人团聚的欢乐的气氛下，母亲觉察出了隐隐的躁动和不安。老大大龙和老三三龙之间只要在母亲不在场的情况下就唇枪舌战，老二二龙和妻子李晓莉为了房子不仅搞起了假离婚而且还有了假戏真做的危险。就是在这种情况下，母亲突然提出了要轮流到三个在城里住的儿子家里居住一段的要求，母亲的要求犹如投石入水引起了一系列的波澜。对于母亲先要到老二郑二龙家里去，不仅二龙没有想到而且老大大龙也感到意外。老大大龙是一个非常孝顺和固执的人，他身为一个大的国营企业的副厂级干部身上难免有了一些做惯了领导而带出来的习气。他认为自己作为家里子女中的老大理应是大家的表率，并且长兄比父，自己在兄弟姊妹中应该有着权威。母亲先到二弟家使得他觉得很不舒服。而二弟二龙也正因Metro BIMBIM Technology BIM Case一对澳洲姐妹的怪诞冒险之旅，由澳版《瑞克和莫蒂》主创Michael Cusack操刀制作。