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Well, we've reviewed the concept of rules, And it has been understood that, A rule consists roughly of two logical units, Match conditions and actions, It is useless to say so much, Let's define a rule by hand. Here, we still take the INPUT chain in the filter table as an example, because the filter table is responsible for the "filtering" function, and if all messages sent to the local machine need to be filtered, they will first pass through the INPUT chain (PREROUTING chain has no filtering function), which is very similar to the "entry" scenario we refer to. Therefore, using the INPUT chain in the filter table as an example is helpful for us to understand.青梅竹马的舒蓉与贝志诚遭遇了前所未有的事业挫折，他们即将上市的舒诚公司屡遭背后黑手暗算。舒蓉的办公室被人闯了空门，对方直冲上市计划而来，虽然没有得手，却暴露出公司内部已有间谍。寻找深藏不漏的内奸，应付接踵而至的突发事件，加快公司的上市步伐，舒蓉和贝志诚忙得不可开交。然而事情的头绪却越理越多，更加令人费解。在公司上市的紧要关头，贝志诚突然莫名其妙的发了水灾，电线短路。一个重要的程序必须在这天完成交给客户，贝志诚只好抱着未完成的硬盘四处寻找网吧。路上，贝志诚无意中遇到了来京投奔好友的宋玉秀，贝志诚好心载了玉秀一程，却不想玉秀下车后，贝的硬盘数据丢失了嫌疑落在了玉秀遗落的箱子上，贝志诚怀疑玉秀的身份与黑客有关，与舒蓉一同进行追查。此时，丢失箱子的玉秀心急如焚，在网上高价拍卖所失箱子里的宝贝。Your "brain" can store all kinds of and endless information, and it can record all your thoughts. Save files, web pages, pictures, and even send e-mail to TheBrain. Adding and deleting are as simple as dragging and dropping.在纪淡海峡上浮现的夏季小岛上In the above code, we use three functions, order500, order200, orderNormal to handle its own business logic, If the current own function cannot handle things, We pass it to the following function to handle it. By analogy, Until there is a function that can handle him, Otherwise, the responsibility chain mode will leave the chain directly, telling that it cannot be processed and throwing an error prompt. Although the above code can be used as the responsibility chain mode, we can see from the above code that the Order500 function depends on functions such as Order200, so there must be this function, which also violates the open-closed principle in object-oriented. Let's continue to understand writing flexible and detachable responsibility chain nodes.绝望与死亡一起降临，哀嚎声与血腥味被尘土所掩盖，越来越小，直到最后没了声息，没了气息。The pulse becomes irregular and may slow down or accelerate.