Category: The back-end

The back-end

629. K pairs of inversions: a sequential DP state transition optimization problem

February 1, 2024

by Mr. John Morton

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"This is the 11th day of my participation in the Gwen Challenge in November. See details: The Last Gwen Challenge in 2021." This is an...

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The back-end

Dubbo source code analysis (ii)—– Annotation-based provider Exporter process analysis

February 1, 2024

by Nigel Knox

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This article Dubbo version is 2.7, 1. Here by @ Import annotations, introducing DubboComponentScanRegistrar object implementation ServiceBean BeanDefinition Bean to register. ServiceAnnotationBeanPostProcessor the Be...

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The back-end

Does anyone share my confusion with python clients using K8S?

February 1, 2024

by Hilary Reed

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Topics list: Python, K8s contribution theme: https://github.com/xitu/juejin-markdown-themestheme:juejinhighlight: controls a yaml file to create

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The back-end

12306 grab tickets to bring enlightenment: see how I use Go to achieve millions of QPS seconds kill system

February 1, 2024

by 王佩君

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Although this article content from seconds to kill the system, the knowledge was not directly involved in instant messaging, but high concurrency practice on the...

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The back-end

Python is the fastest-growing major programming language

February 1, 2024

by Michele Bennett

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On Stackoverflow, problem traffic for major programming languages like Java, Javascript, C#, PHP, and C++ has barely changed over the past few years, with Python...

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The back-end

Power BI on-premises amount is set in “ten thousand”, “hundred million” methods

February 1, 2024

by Mrs. Marie Gardner

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In Powerbi's charts, the default values are shown in thousands, without considering the need for localization. Lead to the amount of the interface display is...

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The back-end

Why does HashMap create an infinite loop?

February 1, 2024

by 熊雅萍

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HashMap dead loop is a common and classic problem, which occurs frequently in daily interviews. Therefore, let's take you to understand the cause of the...

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The back-end

Elasticsearch: How do I search PDF files

February 1, 2024

by Umang Dar

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Elasticsearch is usually used to index data of strings, numbers, dates, etc. But what if you want to index and make searchable files like.pdf or.doc...

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The back-end

How to improve code readability – complex ordering process for example

February 1, 2024

by 刁冠宇

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As for how to improve the readability of the code, here we take a complex order amount calculation process as an example to show how...

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The back-end

Monthly salary 25K program interview essential basic skills

February 1, 2024

by Robert Williams

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In jdK1.7, the expansion header method is optimized to insert directly into the end of the list. In multi-threaded environment, the expansion will cause ring...

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The back-end

ShedLock, a lightweight solution for distributed scheduled tasks

February 1, 2024

by Nathan Mitchell-Smith

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! [](https://p9-juejin.byteimg.com/tos-cn-i-k3u1fbpfcp/d166bc1fc8984f8a89272473b90ae973~tplv-k3u1fbpf

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The back-end

Linked list inversion, palindrome judgment

February 1, 2024

by Arnav Mane

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The problem describes the inversion of singly and bidirectionally linked lists. Prints the common part of two ordered linked lists. Determines whether a linked list...

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The back-end

Take you to Go microservices in 10 days

February 1, 2024

by Riaan Sachar

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We will show you an example of go-Zero microservice in detail through a series of ten articles. The directory structure is as follows: Environment setup...

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The back-end

Assignment puzzles for Python tuples

February 1, 2024

by Mark Martin

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Most people understand the difference between a tuple and a list by saying that a tuple is an immutable sequence that cannot be assigned to...

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The back-end

“Naocs 2.x” (ix) How does SpringCloud implement dynamic configuration refresh?

February 1, 2024

by Mr. Matthew Thomas

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Some time ago, I explored how to synchronize Nacos configuration changes with the Spring Boot project. This time we will continue to look at how...

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The back-end

EMQ Million level MQTT Messaging Service (ACL Authentication)

February 1, 2024

by 楊冠霖

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While EMQ is already up and running, there are still some problems to put into business use, and of course MQTT was designed with this...

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The back-end

Shiro uses tokens for authentication

February 1, 2024

by 周佳樺

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The old project Shiro uses Token for authentication, no worries about the cross-domain integration of the front and back end, and at the same time...

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The back-end

Linux common zip compression and decompression command details

February 1, 2024

by Tammy Hood

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Hi everyone, it's time to meet you again, thank you for your company in 2021 and let's keep going in 2022. I believe that many...

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The back-end

Assignment in Python

February 1, 2024

by Vanessa Johnson

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This is the 12th day of my participation in the November More Text Challenge, the last More Text Challenge in 2021, what are the assignment...

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The back-end

A fingerprint file using steganography

February 1, 2024

by Claudia Chapman

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Steganography is the practice of hiding messages where they are not expected to appear. In well-performed steganography, anyone who is not the intended recipient can...

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The back-end

SpringAMQP MessageConverter – MessageConverter

February 1, 2024

by 張心怡

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When we send messages, normally the message body is binary data transmission. If we want to help us internally convert or specify a custom converter,...

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The back-end

An algorithm problem – a combination of letters for telephone numbers

February 1, 2024

by Alison McGregor

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In classification, this is a hash table problem, but in real implementation, this is a depth-first problem. Given a string containing only the numbers 2-9,...

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The back-end

# Learning Python# Python and databases

February 1, 2024

by Travis Porter

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SQLite is a database that is installed automatically on your computer after you install Python. SQLite is a database that can persistently store data on...

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The back-end

Upload pictures through API interface

February 1, 2024

by Amanda Ochoa

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Recently, I have realized the requirements of interface function, realizing an API picture uploading, supplementing the picture information after the merchant opens an account, for...

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The back-end

Question 17 – A combination of letters for telephone numbers

February 1, 2024

by Robert Maddox

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Given a string containing only the numbers 2-9, return all the letter combinations it can represent. The answers can be returned in any order

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The back-end

Top 10 Interview questions you must Memorize

February 1, 2024

by Aaron Middlemiss

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The first one was to brush off a large number of people. There were many students who "knew automation" to consult technical problems, and he...

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The back-end

Redis master-slave synchronization (II) after 2.8 ways

February 1, 2024

by Lisa Tran

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The previous article talked about the shortcomings of the pre-2.8 approach. Remember, today we will talk about the improvements to the master-slave synchronization approach of...

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The back-end

Chrome regret medicine, recommended a useful plug-in

February 1, 2024

by Zachary Taylor

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Two very useful Chrome plugins are recommended today. The article is short, but the plug-in is useful. If you are a heavy Chrome user, you...

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The back-end

How to protect your Python code: Existing encryption schemes

February 1, 2024

by Riaan Sachar

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This paper first introduces the ideas, methods, advantages and disadvantages of existing source code encryption schemes, and then introduces how to better encrypt and decrypt...

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The back-end

Memory leaks caused by JVM tuning glibc

February 1, 2024

by Tara Ramirez

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Recalling from the previous article on JVM tuning G1 for CMS, we switched from G1 to CMS and adjusted JVM parameters, resulting in very slow...

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