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Event Handler: It consists of multiple callback methods, which constitute an application-related feedback mechanism for an event. There is no event handler mechanism in the Java NIO field for us to call or make callbacks, but we write our own code. Netty has made an upgrade in the role of event handler compared with Java NIO. It provides us developers with a large number of callback methods for us to implement corresponding callback methods for business logic processing when specific events are generated, namely ChannelHandler. The methods in ChannelHandler correspond to callbacks to each event.二年级的女孩何西西是一个有公主梦的“女汉子”，善良可爱又充满奇思妙想， 而她的哥哥上初中的何东东却是一个“安静的美男子”。兄妹俩都在“德馨学园”上学，本剧围绕着东东西西兄妹和他们身边的家长、老师以及小伙伴们展开。每一集都是以孩子的清澈眼睛、纯真心灵为视角的小故事，以小见大地涵盖社会、人伦、环保、生存、信仰等问题，潜移默化地普及“爱、美、责任”的精神内核。这到底是为什么？这下，连张槐和小葱也同情起田遥来。Although the above code can meet the requirements, it is not easy to expand and difficult to read. If I want one or two conditions in the future, if I want to recharge 300 yuan successfully, I can win the 150 yuan red envelope, then I have to change the code inside at this time, so the coupling between business logic and code is relatively high, and I accidentally correct the wrong code. At this time, we try to use the responsibility chain mode to transfer objects in turn to realize it.为了寻找失散了的muu开始了行动的hajimi，在那里完成奇迹的邂逅——。Method 2: Delete rules according to specific matching conditions and actions