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如果觉得这本书还有点意思，那就请收藏一下。The policy mode is the packaging of the algorithm, which separates the responsibility of using the algorithm from the algorithm itself and delegates it to different objects. Policy patterns usually wrap a series of algorithms into a series of policy classes. To encapsulate the policy pattern in one sentence is to "encapsulate each algorithm into a different policy class so that they can be interchanged". The following is the structure diagram of the policy mode:Some time ago, I looked for a job and read a lot of books on the event distribution mechanism. All Daniel analyzed it from different angles. I have benefited a lot, so I have this analysis of absorbing the essence of heaven and earth.In theory, a crown number has only one birthday number, and the crown number is very limited. There are countless people born on the same day in China, so this kind of resource is relatively rare and will not be available once sold. Therefore, please contact us to inform you of the birthday number you are looking for before purchasing. We will search our birthday number library to see if it has not been sold yet. Therefore, we must hurry up! This set of birthday notes is suitable for wedding commemorations, birthday numbers, and any special memorable day.皇上第一次赐婚，逼得你妹子小小年纪就离开家，投入军中。韩信本来就有种自满之心，自命不凡，不将刘邦看在眼里。Different from other malicious data tampering or hijacking attacks, DDoS is simple and crude, and can directly destroy the target. In addition, compared with other attack methods DDoS, the technical requirements and the cost of launching the attack are very low, only some server permissions need to be purchased or a batch of broilers need to be controlled, and the corresponding attack speed is very fast and the attack effect is visible. On the other hand, DDoS is easy to attack and difficult to defend. In order to ensure the needs of normal customers, service providers need to spend a lot of resources to fight against the attack initiator. These characteristics make DDoS a very good sword in the hands of hackers and a thunderbolt.