XML summary -- XML parsing

Article directory XML analysis 1, XML parsing 1. DOM parsing 2. SAX parsing 3. Dom4j parsing xml XML analysis 1, XML parsing There are two ways to parse XML: dom and sax dom:(Document Object Model), a way to process XML sax:(Simple API for XML) is not an official standard, but it is a ...

Posted on Thu, 16 Jan 2020 08:03:00 -0500 by stovellp

Reachability algorithm

1, Reachability analysis algorithm In Java, the Reachability Analysis is used to determine whether an object is alive or not. The basic idea of this algorithm is to start with some objects called GC Roots, and start to search down from these nodes. The path that the search passes through is called reference chain. When there is no reference ch ...

Posted on Thu, 16 Jan 2020 07:18:39 -0500 by f1r3fl3x

Graphic kubernetes scheduler preselection design implementation learning

In the Scheduler, there will be a round of pre selection process in the process of node election, i.e. selecting a batch of node nodes from the current cluster. This paper mainly analyzes some excellent design ideas of k8s in the pre selection process, and welcomes the leaders to correct them 1. Basic design 1.1 preselection scenario Preselecti ...

Posted on Thu, 16 Jan 2020 05:57:59 -0500 by andre&rachel

PythonI/O advanced learning notes multithreading of 10.python

 content: 1. GIL of Python 2. Simple example of multithreading programming 3. Communication between threads 4. thread pool 5. threadpool Future source code analysis   ===========================   1, GIL of python About python's GIL, I think it's really good written by a blogger. It's clear and easy to understand. http://cenalulu.github.io/py ...

Posted on Thu, 16 Jan 2020 05:11:02 -0500 by CoreLEx

php multiprocess programming

php multiprocess programming PHP's process control supports Unix mode process creation, program execution, signal processing and process interruption. Process control cannot be applied to the Web server environment, which may bring unexpected results when used in the Web service environment.   pcntl function pcntl_fork(): generates a branch ( ...

Posted on Thu, 16 Jan 2020 03:25:27 -0500 by Travist6983

Hand in hand to teach you MySQL query optimization analysis

Preface MySQL is a kind of relational database, which has strong query function, high data consistency, high data security and supports secondary index. However, the performance is slightly inferior to that of non relational databases, especially for data above one million levels, which is easy to cause slow query. At this time, we need to ana ...

Posted on Thu, 16 Jan 2020 02:02:29 -0500 by nuying117

WeChat public number develops WeChat access authentication as developer

I. Preface This series of tutorials will be based on springboot2.1.8.RELEASE This article will implement Registered account number Access to WeChat Certification as a developer 2, Enter wechat public platform to register account https://mp.weixin.qq.com/ Personal user suggested to register subscription number Finally, the registration was ...

Posted on Thu, 16 Jan 2020 01:54:45 -0500 by galayman

GPS coordinate conversion Proj.4 Library

Compiling and using Proj.4 Library Proj.4 is the most famous map projection Library of open source GIS. The projection of software such as grade GIS, MapServer, PostGIS, Thuban, ogdi, mapnik, topocad, GDAL / ogr directly or indirectly uses Proj.4. The functions of Proj.4 mainly include the conversion ...

Posted on Wed, 15 Jan 2020 23:39:17 -0500 by stewart715

KeepAlived guarantees Mysql auto-switch

Environmental preparation Previous articles paved the way for MySQL master slave building: Article 1: Common settings for Binlog in MySQL Article 2: MySQL Master-Slave Synchronization-Principle-Practice Start the two mysql servers for Master and Slave with the following information: ➜ ~ docker ps -a CONTAINER ID IMAGE ...

Posted on Wed, 15 Jan 2020 21:08:24 -0500 by powergen

Document deletion for the SpringBoot series tutorial Solr

Document deletion for Solr, 200114-SpringBoot series tutorial The previous Search tutorial did not continue at the beginning, and now it is picked up again, at least to complete the basic operation posture of CURD; this article focuses on how to delete data <!-- more --> I. Configuration Before introducing demo, you need to install sol ...

Posted on Wed, 15 Jan 2020 21:08:27 -0500 by raahatazim