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Visitor pattern decouples the data structure from the operations acting on the structure, making the operation set relatively free to evolve. Visitor pattern is suitable for systems with relatively stable data structure and easy change of algorithm. Because visitor mode makes it easy to increase algorithm operation. If system data structure objects are easy to change and new data objects are often added, visitor mode is not suitable. The advantage of visitor mode is that it is easy to add operations, because adding operations means adding new visitors. Visitor mode centralizes the relevant behaviors into one visitor object, and its changes do not affect the system data structure. Its disadvantage is that it is difficult to add new data structures. -From EncyclopediaWhat if there is no mentor//194待众人都走的时候，刘邦一挥手让赵子儿先行离去，随即留下了张良.汉王，有什么吩咐吗？张良知道刘邦将自救留下一定是有什么要紧事情。[java] view plain张槐走到郑氏身边。The essence of the mirror server mentioned in the previous section is to build a miniature CDN by itself. The same is true behind the high-security IP provided by major cloud service providers: the website domain name points to the high-security IP, which provides a buffer layer to clean traffic and cache the content of the source server.