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(1) When the server program starts, ChannelPipeline will be configured. ChannelPipeline is a ChannelHandler chain. When all events occur, a method in ChannelHandler will be triggered. This event will propagate in the ChannelHandler chain in ChannelPipeline. Then, get a NioEventLoop from the bossGroup event loop pool to realize the operation of the server-side program binding the local port, register the corresponding ServerSocketChannel on the Selector in the NioEventLoop, and register the ACCEPT event as the event of interest to the ServerSocketChannel.Handle (Handle or Descriptor, referred to as Handle under Windows and Descriptor under Linux): Essentially represents a resource (such as file descriptor or socket descriptor for network programming) provided by the operating system; This resource is used to represent events one by one, which can come from both the outside and the inside. External events such as the client's connection request, the data sent by the client, etc.; Internal events such as timing events generated by the operating system. It is essentially a file descriptor, and Handle is the birthplace of events.After the ball is thrown into the basket and approved by the referee, it is counted as a score. 2 points can be scored for the input inside the 3-point line; 3 points can be scored if you put on the outside of the 3-point line, and the ball scored by stepping on the 3-point line with your heel or toe is regarded as a 2-point ball. One point from the free throw. 　　(3-1) X 3　　在那里，他们遇到了一位自称为普鲁修卡的女孩子……Big city lawyer Joanna Hanley returns to her hometown to take the case of a group of girls suffering from a mysterious illness.Private mediator mediator;