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In the termination phase of TCP connection, four interactions with FIN messages are usually used to cut off the connection with the client and the server. However, when one of the client or the server is abnormal, it will not be able to complete four waves to terminate the connection. At this time, RST messages will be used to forcibly interrupt the connection.Graphic: GeForce GTX 670/GeForce GTX 1050/AMD Radeon HD 7870　　当地警官高级督察Paul Kirby负责维持秩序，但人们不知道的是，一股骇人力量正在小镇那些安逸的街道上集结。这些孩子，可能是潜在的寄...只要他点点头，十二亿元就能收入腰包。We can see the above code; Player-to-player coupling code has been removed, However, all logical operations are put into the intermediary object for processing. Any operation of a certain player does not need to traverse to notify other players, but only needs to send a message to the intermediary. The intermediary processes the message after receiving it, and after processing the message, the processing result will be fed back to other player objects. The intermediary mode is used to remove the coupling code between objects. Make the program more flexible.Imagine, Qu goblin on that occasion, the old man wants to drink together, how will act, think about all feel interesting.Understanding Factory Method Patterns: All Factory Method Patterns are used to create objects. The factory method pattern encapsulates the object creation process by letting subclasses decide what the created object is. The factory method pattern has the following roles: