Programmer Group

1. Foundation construction The implementation logic in sync.WaitGroup is quite simple. After reading the previous sync.Mutex and synx.RWMutex, it should be very simple to read them. The only difference is the state1 in sync.WaitGroup 1.1 waiting mechanism sync.WaitGroup is mainly used to wait for a group of goroutines to exit. In essence, ...

Preface As for what spring security is, there are two main functions: user authentication and authorization. That is, we often say that users can only perform other operations after logging in. If they do not log in, they will be redirected to the login interface. Some users have permission to perform an operation, while others are authorized i ...

Kubeadm is an official tool provided by Kubernetes to quickly install the Kubernetes cluster. With each release of Kubernetes updated synchronously, Kubeadm will adjust some of the cluster configuration practices. By experimenting with kubeadm, you can learn some new Kubernetes official best practices on cluster configuration. operating system ...

I like to use OOP in large projects that I'm currently working on. I need to create several classes in JavaScript, but if I remember correctly, there are at least two ways to do this. What is grammar and why is it used in this way? I want to avoid using third-party libraries - at least in the first place. In search of other answers, I foun ...

solr version: 8.x springboot version: 1.5.6 1. To prepare the springboot project, pom.xml needs to introduce the following jar package <properties>     <project.final.name>htsolr</project.final.name>     <java.version>1.8</java.version>     <project.build.sourceEncoding>UTF-8</project.build.sourceEnc ...

Interceptor (interceptor) 1, Interceptor overview Interceptor is one of the most powerful features of struts 2. It is a mechanism that allows users to do some processing before Action execution and after Result execution. Interceptors are conceptually the same as servlet filters or JDK proxy classes. Interceptors allow for crosscutting, separa ...

order This paper mainly studies the schedule message service of rocketmq ScheduleMessageService rocketmq-all-4.6.0-source-release/store/src/main/java/org/apache/rocketmq/store/schedule/ScheduleMessageService.java public class ScheduleMessageService extends ConfigManager { private static final InternalLogger log = InternalLoggerFactory.getLo ...

#In the main function, input a set of (10) C language scores into the array score [], and output as shown in the figure The main menu shown in the figure is called according to different selections The corresponding functions are realized by writing functions: (1) Output average score; (2) Rank and output the scores; (3) Output scores lower t ...

IO, often collaborative I/O, is the abbreviation of Input/Output, that is, Input/Output. At present, there are three types of IO coexisting. They are BIO, NIO and AIO. Before we get to know IO, let's look at the concepts. Related concepts Flow oriented and buffer oriented The first big difference between Java IO and NIO is that IO is strea ...

feign introduction Feign is a Restful client component of Java. Feign makes it easier to write Java HTTP client. Feign was inspired by Retrofit, JAXRS-2.0 and WebSocket. Feign has nearly 3K stars on github, which is a quite excellent open source component. Although it is inferior to nearly 30K stars of Retrofit, spring cloud integrates feign, w ...