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Compared with the example of electric lights, file uploading differs in that it will now face more complicated conditional switching relationships. In the example of an electric lamp, the state of the electric lamp is always from off to on and then to off, or from off to low light, low light to strong light, strong light to off. ABCA always seems to follow the rules, so even if you don't use the state mode to write the light program, but use the original if, else to control the state switching, you won't lose yourself in logic writing, because the state switching always follows some simple rules.片刻之后，数十骑快马疾驰出城，绝尘而去，正是往香溪镇的方向。(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.孔雀城内驻守着两万孔雀军，其中不乏会游水的将士。　　·兄弟俩以某些演员为原型创作了剧本。是周家派来的，说是周爷爷正在进京的路上。Private investigator Abel Walker along with his cameraman, Jim, is on the hunt for a missing woman. As they unravel the mystery of her disappearance, they become caught in a sick and violent game that will end in murder…