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Structural patterns, as the name implies, discuss the structure of classes and objects and are mainly used to deal with the combination of classes or objects. It includes two types, one is class structure pattern, which refers to the combination of interfaces or implementations by inheritance mechanism. The second is the object structure mode, which refers to the realization of new functions by combining objects. It includes adapter mode, bridge mode, decorator mode, combination mode, appearance mode, element mode and agent mode.(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.For chronic diseases, death caused by aging is a long or short process and the last journey of life.5.4. 3还有后面，小龙女教杨过修炼武功《天罗地网势》，需要用到麻雀。青莲虽然脸红，却十分认真地看和听。