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3. Code Encapsulation of Publish-Subscribe Mode刚刚大学毕业的安可，在求职过程中屡屡碰壁，正在焦头烂额时候，解释了网络八卦主播糖果。安可在糖果劝说下，开始了网络主播行业，却因为刚入行不了解直播行业，屡屡闹出笑话。只是令狐冲不知道，这天象变化，是由东方不败造成的，东方不败正在湖边修炼武学。Here, the filter gateway mainly indicates the firewall, and of course the router can also become the filter gateway. Firewall is deployed between different networks to prevent foreign illegal attacks and the leakage of confidential information. It is located between the client and the server. Using it to protect SYN attacks can play a very good role. Filter gateway protection mainly includes timeout setting, SYN gateway and SYN agent.(1) a mast light at the front;After understanding the history and classification of design patterns, how should we learn design patterns? Before learning the design pattern, readers must establish a kind of consciousness, that is, the design pattern is not only a method and technology, but also an idea and a methodology. It has nothing to do with the specific language. The main purpose of learning design patterns is to establish object-oriented ideas, program to the interface as much as possible, with low coupling and high cohesion, so that the programs you design can be reused as much as possible. "Specious. Learning design patterns can better understand object-oriented ideas. Design patterns are some design skills and tricks. Don't rise to ideas and methodologies, okay?"不过这个帖子中，那个网友一脸哀嚎，因为要带走轻舞飞扬，就必须先治好她的病。