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In order to make good use of the principle of composite reuse, we first need to distinguish the relationship between "Has-A" and "Is-A".FLYWEIGHT refers to the lightest weight in boxing. The meta-sharing mode efficiently supports a large number of fine-grained objects in a shared way. The key to sharing the meta-sharing mode is to distinguish the intrinsic state from the extrinsic state. The intrinsic state is stored in the element and will not vary with the change of environment. The exogenous state changes with the change of environment. The extrinsic state cannot affect the intrinsic state, they are independent of each other. Distinguish the states that can be shared from the states that cannot be shared from the regular class, and eliminate the states that cannot be shared from the class. Clients cannot directly create shared objects, but should use a factory object to create shared objects. The meta-sharing mode greatly reduces the number of objects in memory.Among them, one of the more common attacks is CC attack. It simply and roughly sends a large number of normal requests, exceeding the maximum capacity of the server and causing downtime. What I encountered was a CC attack. At most, about 20 IP addresses around the world sent requests in turn, with the number of requests per address ranging from 200 to 300 times per second. When I read the log, I felt that those requests poured in like a flood. In the blink of an eye, there were a lot of requests. In a few minutes, the volume of the log file increased by 100MB. To tell the truth, this is only a small attack, but my personal website has no protection, and the server is still shared with others. This kind of traffic immediately goes offline.