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This article is a reprint of the article, the original link https://www.cnblogs.com/keerya/p/7987886.html catalogue Introduction to ansible What is ansible?ansible featuresansible architecture diagramansible task execution ansible task execution modeansible execution processansible command execution processDetailed explanati ...

Mapping operation The mapping in the index library is similar to the table structure in the database. To create a database table, you need to set the field name, type, length, constraint, etc; The same is true for the index library. You need to know what fields are under this type and what constraint information each field has. This is ...

In the multithreaded environment, programs often have some thread safety problems. Therefore, Java provides some thread synchronization mechanisms to solve the safety problems, such as synchronized Lock and Lock lock. Pessimistic lock and optimistic lock We can roughly divide locks into two categories: Pessimistic lock Optimistic lock As ...

Concept introduction of domestic SM4 encryption and decryption algorithm SMS4 algorithm is an encryption algorithm used in WAPI wireless network standard widely used in China. It is a 32 round iterative packet encryption algorithm with unbalanced Feistel structure. Its key length and packet length are 128. The algorithm used in the encryption ...

Here we mainly introduce the operations of install ing using cmake: The content that can be installed through cmake can include target binary, dynamic library, static library, files, directories, scripts, etc., which are briefly described below: For details, please refer to the official website. Here is a brief description 1. Installation of ...

Design pattern Concept: a pattern is a summary of code design experience that is repeatedly used, known by most people, written by classification; It is not a syntax specification, but a set of solutions to improve code reusability, maintainability, readability, robustness and security. Tip: the following is the main content of this a ...

Scrapy crawler framework To the most professional web crawler framework learning part, we should play a better spirit to meet new challenges. 1. Installation pip install scrapy After installation, enter the following command to test the effect: scrapy -h The correct response indicates that the installation has been successful. 2. Brief ...

PriorityBlockingQueue is an unbounded array based priority blocking queue. The default length of the array is 11. Although the length of the array is specified, it can be expanded indefinitely until the resources are exhausted. Each time out of the queue, the element with the highest or lowest priority is returned. By default, elements are sort ...

1. Experimental task 1 Contents of this part: Give the program task1.asm source code, and run screenshots assume cs:code, ds:data data segment x db 1, 9, 3 len1 equ $ - x y dw 1, 9, 3 len2 equ $ - y data ends code segment start: mov ax, data mov ds, ax mov si, offset x mov cx, len1 mov ah, 2 s1:mov dl, ...

1. Basic operation of class 1.1. Definition of class Class or type is the abstraction of an objective class of things. A class keyword is used to describe the properties, behaviors, etc. of this kind of things in this class. In other words, a kind of things described in computer language, that is, classes, are identified by the keyword class ...