Programmer Group

Enumeration usage problems ​ In web development, enumeration is usually used as status code, code table value, etc., so we often use it in the three-tier architecture. We pass values through the front end, traverse enumeration items, and compare them manually one by one. Manual comparison is still cumbersome. Here is the method of automatic f ...

introduction Children's shoes familiar with concurrency know that concurrent programming has three characteristics: visibility, orderliness and atomicity. Today, we analyze visibility from a demo and how to ensure visibility. JMM model Before we analyze visibility, we need to understand the concept of JMM model, which is often referred to as ...

Open status interface First, install the corresponding software package -- with HTTP when compiling_ gzip_ static_ Module, then add content to the configuration file, and finally access it in the browser [root@nginx conf]# pwd /usr/local/nginx/conf [root@nginx conf]# vim nginx.conf ...... location / { root html; index index.html ...

Foreword: the knowledge to share today is the Spring framework The code word is not easy. Give me a praise Reprint, please explain! Development tool: eclipse catalogue Spring framework overview ① What is the Spring framework ② Advantages of Spring framework ③ Spring architecture   Ioc (control reversal) and cases Three Spring pa ...

catalogue ​ 5, Deploy master components 1. Operate on the master01 node 6, Deploying Woker Node components 1. Operate on the master01 node 2. Operate on node01 node 3. Operate on the master1 node 4. Operate on node01 node 5. Operate on the master01 node   6. Operate on node01 node 7.node02 node deployment (method 1) node02 node ...

  catalogue 1. redis installation 2.Redis's single thread and high performance 3. Five core data structures are most commonly used in redis Internet 3.1 common string operations 3.2 string common scenarios 3.2.1 single value cache 3.2.2 object cache 3.2.3 distributed lock 3.2.4 counter 3.2.5 counter 3.2.6 Web Cluster session shari ...

2021SC@SDUSC                  In the fourth article, we explored how cacheflush initializes. Now let's look at how cacheflush handles flush requests.          Through the analysis in the previous article, we know that there are two queues and collections that store flush requests ...

Luogu P3805 manacher algorithm Horse drawn cart algorithm is an algorithm for finding the longest palindrome string. Its core is to reduce redundant repeated calculation, and use the currently known data to deduce the subsequent data as much as possible, so as to achieve linear complexity. I think the core of this algorithm is to make full use ...

brief introduction Although logical regression bears the name of regression, it actually does classification. The general form of regression can be expressed as: f ( x ) = ...

catalogue Application scenario: Basic principle: Implementation method 1: Using redis as distributed lock Implementation mode 2: Using redistribution as a distributed lock Application scenario: In current distributed applications, there are often scenarios where high concurrent traffic accesses db. In order to prevent the database from ...