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The entrance is the place where one-day tickets and single subway tickets are put in. When entering the station, the tickets will be put in and passed quickly. The put-in tickets will pop out in front. Remember to take them away. When leaving the station, one-day tickets and subway tickets also need to be put in. The difference is that one-day tickets will still be popped up, while single subway tickets will not.(3) When a client initiates a connection request to the server, the event cycle of NioEventLoop listens to the ACCEPT event, and the Netty bottom layer will receive the connection, obtain the connection with the client through the accept () method (SocketChannel), and then trigger the ChannelRead event (i.e., the ChannelRead method in the ChannelHandler will get a callback), which will be executed and propagated in the ChannelHandler chain in the ChannelPipeline.　　某日，一帮穷凶极恶的劫匪袭击的实验室，昆丁最好的朋友在交火中不幸丧生，这让昆丁感到十分悲痛，他发誓要替朋友报仇，并且拟定了一个危险的计划。实验室正在研究一种由蜘蛛血提炼而来的药物，昆丁偷到了这种药物，并且将它注入了自己的血液之中。可怕的事情发生了，昆丁并没有变成强壮的蜘蛛侠，而是渐渐的成为了毛茸茸的大蜘蛛。Proxy is a noun and Delegate is a verb. Secondly, proxy shows that several objects implement a common interface, while delegate only shows that one object references another object and does not involve an interface.The above is just a synchronous chain of responsibilities, We let each node function return a specific value "nextSuccessor" synchronously, To indicate whether to pass the request to the next node, we will often encounter AJAX asynchronous requests in our development. After the request is successful, we need to do something so-and-so. At this time, if we apply the above synchronous request again, it will not take effect. Let's understand and use asynchronous responsibility chain to solve this problem. We add another prototype method Chain.prototype.next to the Chain class to manually pass the request to the next node in the responsibility chain.9. The term "in voyage" means that the ship is not at anchor, moored or stranded.