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Observer Pattern mainly solves that when there is a one to many relationship between objects, when an object is modified, it will automatically notify other objects that depend on it. In the design pattern, the Observer Pattern belongs to the behavior pattern.1 Classic observer modeIn books related to design patterns, the following figure is mo ...

Reading this article requires readers to have at least a basic knowledge of C/C + + network programming and how to use the basic Socket API At the same time, readers should have at least used cfadmin framework and be proficient in using built-in library to complete simple business logic writing Students interested in this article can also Off ...

1, abstract class When defining a class, it is often necessary to define some methods to describe the behavior characteristics of the class, but sometimes the implementation of these methods is uncertain. For example, if an Employee class is defined, its work() method describes work, but their work is different for different positions. For thi ...

Use of system built-in interceptor During Flume operation, Flume has the ability to modify / delete events during the operation phase, which is realized through interceptors. The interceptors have the following characteristics: The interceptor needs to implement the org.apache.flume.interceptor.Interceptor interface.The interceptor can modify ...

Note: the coding tool is CLion+Cygwin64 catalogue copy constructor assignment Function return object Object is passed as a function parameter Shallow copy Deep copy copy constructor         When C + + assigns a value to an object reference, returns an object from a function, or passes an object as a function p ...

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storage structure 1. Open addressing method (y general recommendation) The principle of open addressing method is similar to going to the toilet 2. Zipper method Similar to adjacency table String hash mode p-ary 1. Treat the string as a p-ary number 2. Convert the number in p-ary to the number in 10-ary 3. For the whole number modQ In this ...

Since the implementation of React Hooks, Redux is out of place as a state management scheme. Dan Abramov mentioned "You might not need Redux" a long time ago. Developers must write a lot of "pattern code". Cumbersome and repetition are not tolerated by developers. In addition to the fact that the concepts such as actions/red ...

to configure 3.1. Core configuration file The MyBatis configuration file contains settings and attribute information that deeply affect MyBatis behavior. The top-level structure of the configuration document is as follows: configuration properties settings typeAliases typeHandlers objectFactory (object factory) plugins environment ...

IO stream 1, IO stream overview and classification IO stream introduction IO: input / outputStream: it is an abstract concept, which is the general name of data transmission. In other words, the transmission of data between devices is called stream, and the essence of stream is data transmissionIO stream is used to deal with data transmissio ...