《万能管家》 （ Jeeves and Wooster ）是 Hugh Laurie 大叔和 Stephen Fry大叔在二十世纪九十年代的作品。The attack uses the method of sending a large number of domain name resolution requests to the attacked server, Usually the domain name requested to be resolved is randomly generated or does not exist on the network. When the attacked DNS server receives the domain name resolution request, it will first look for whether there is a corresponding cache on the server. If it cannot be found and the domain name cannot be directly resolved by the server, the DNS server will recursively query the domain name information from its upper DNS server. The process of domain name resolution brings a great load to the server. If the number of domain name resolution requests exceeds a certain number per second, the DNS server will time out to resolve domain names.For example, I now need to create a div element on the page. Then we definitely need a function to create the div, Now all I need is this function, which is only responsible for creating div elements. It doesn't want to take care of the rest, That is, to realize the principle of single responsibility, Just like Kissy on Taobao, At the beginning, they defined Kissy to do only one thing and did it well. The specific instantiation class in the monomer mode was handled by the agent function. The advantage of doing so was that the specific business logic was separated. The agent only cared about the business logic of the agent. Here, the function of the agent was to instantiate the object and instantiate it only once. Create div code just create div, the others don't care; The following code:The adapter for the interface is as follows: Sometimes we write an interface with multiple abstract methods, When we write the implementation class for the interface, All methods of the interface must be implemented, This is obviously wasteful at times, Because not all methods are what we need, Sometimes only a few are needed, In order to solve this problem here, we have introduced the adapter mode of the interface. With the help of an abstract class, the abstract class implements the interface and all methods. However, we do not deal with the original interface, but only get in touch with the abstract class, so we write a class, inherit the abstract class and rewrite the methods we need. Take a look at the class diagram:如今张家防守可严了，小辈们更是严禁外出。周菡肯定地说道：当然是真的。Practical Experience: I got up at 5: 30 on the morning of the 12th, because I had to gather in front of the public health building at 6: 30. This was the earliest time I got up in my college life. It was really a challenge! But I understand that the challenge is just the same as ours. After getting up, washing and tidying up, I finished the breakfast prepared the night before and arrived at the gathering place on time. Although they got up so early, every player was full of passion and did not feel sleepy at all. The teacher arranged us to carry the necessary items such as banners, flags, leaflets, brochures, questionnaires, etc. to the car. We have one more player-the driver. After everything was ready, the driver and master drove to Shexian County. On the bus, the teacher sent everyone a questionnaire to familiarize themselves with the information. At the same time, the teacher divided our 14 students into two groups. As a result, every 2 teachers led 7 students to act separately, which improved the work efficiency. It was already over 1 p.m. when we left at 7 a.m. Since we have not driven to Shexian before, we only asked others about how long it will take us to arrive. We were not familiar with the road and encountered a traffic jam on the road, which made us arrive more than 3 hours later than planned. It's really that the plan can't catch up with the change! I got up early in the morning and ate less. At the moment, everyone's face showed a slightly tired expression, but my eyes were still full of passion. When we arrived, we all had lunch in a restaurant. In order to reduce too much consumption, we also had a simple meal. But we are already very satisfied, after all, this is not the purpose of coming. Coming, we will eat the bitter, do
