Software System
Software System
Understand background-origin, background-clip, background-size
Software System
SpringBoot2.x basic articles: develop your first SpringBoot application
Software System
Functional programming-play with high-level callback functions
Software System
Some advanced usages of swift GCD
Software Testing
Software Testing

Flow-Javascript static type checking tool produced by Facebook

... Cole
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Software Testing

Sale of the latest tools for car unlocking equipment

... Paige
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Software Testing

[Mvn test on the basis of testing and opening] 1. Use maven-surefire-plugin to complete the basic execution management and stepping on test cases

... Jesse
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Software Testing

C++ template from mastery to schizophrenia

... Sophia
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Software Testing

[Lao Meng Flutter] 6 toolkits that greatly improve the efficiency of Flutter development

... Bryce
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Software Testing

Into the world of JavaWeb technology 12: From manual compilation and packaging to project build tool Maven

... Rowan
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Software tools
Software Tools

Web-side instant messaging technology inventory: short polling, Comet, Websocket, SSE

Web-side instant messaging technology has not been easy to implement due to the design constraints of the browser. There are roughly four mainstream Web-side instant messaging solutions: traditional Ajax short polling, Comet technology, WebSocket technology, SSE (Server -sent Events). This article will briefly introduce the principles of these four technologies, and point out the similarities and differences, advantages and disadvantages of each.  1   overview1 996-year IETF HTTP Work

... Kaiden
schedule 13 min read
Software Tools

What kind of rapid development platform should the enterprise information management system adopt?

If an enterprise adopts a rapid development platform for information management, it must first clarify its own needs, know what kind of function it wants, and what management purpose it wants to achieve. It is best to mobilize internally and brainstorm; secondly, choose the rapid development platform At that time, it is necessary to comprehensively consider the ease of use and scalability of the platform. If the application develops the platform quickly, and the developers need to write code and

... Cole
schedule 2 min read
Software Tools

What exactly did the registerReceiver, sendBroadcast, and onReceive systems for analyzing broadcasts do?

Introduction BroadcastReceiver is one of the four major components of Android. It acts as an important communication method within the application and between processes. It can deliver a message to the subscribed broadcast receiver in the form of broadcast. Let's analyze the broadcast below. What exactly did the Android source code do after registering to receive the message? Source code analysis registerReceiver Timing diagram Code explanation We follow the above sequence diagram to explain the

... Nolan
schedule 8 min read
Software Tools

Detailed analysis of DES series encryption technology (2)

We mentioned in the previous article "Detailed Analysis of DES Series Encryption Technology (1)" that DES was cracked in January 1999, and an analysis report proposed some theoretical vulnerabilities in the DES algorithm. In addition, in 2001, DES As a standard, it has been replaced. Once an encryption technology is cracked, it is inevitable to be replaced. For DES, who will replace it? Today we will discuss the descendants of DES. It is 3DES and AES. 3DES (triple-DES) is a cryptographic algori

... Hailey
schedule 9 min read
Software Tools

[Version upgrade] PerfDog adds multi-dimensional test report comparison function and iOS battery test function upgrade

With the warm spring sun and the epidemic will eventually pass, PerfDog will bring a major update to users in the new year: a new multi-dimensional test report comparison function is added, and the iOS power test function is newly upgraded. We sincerely invite everyone to experience.Version update contentTest report comparison function[Heavy release] Multi-dimensional comparison: support details, models, versions, scales, intervals, trends, drag zoom, etc.iOS battery test function upgrade[Heavy

... Ella
schedule 5 min read
Software Tools

Use MaxCompute to build a social friend recommendation system

Details about using MaxCompute: Apsara Clouder Big Data Special Skills Certification: Use MaxCompute to build a social friend recommendation system Apsara Clouder Big Data Special Skills Certification: Use MaxCompute to build a social friend recommendation system This certification can help students understand how to use Alibaba Cloud big data computing services to quickly build an enterprise-level social friend recommendation system, and master the ability to use cloud-related big data services

... George
schedule 4 min read
Database Technologies
Database Technologies

Pandas operating mysql database

Sometimes our requirement in the company is to operate the data in the mysql database. If we can use pandas to directly operate mysql, it will be more convenient. So here to share with you the read and write operations of pandas on the mysql database:pandas reads the mysql database:[Python] Plain text view Copy code?010203040506070809101112131415161718# import pandas as pdfrom sqlalchemy import create_engine # pymysql # MySQL root, :147369, 3306, mydbengine = create_engine('mysql+pymysql://root:

Database Technologies

JAVA concurrency - CyclicBarrier and CountDownLatch source code detailed explanation

Overview CountDownLatchAnd CyclicBarrierhave similarities, and often someone will come up to compare them, this time, I try to resolve these two classes separately from the source point of view, and from the perspective of the source code, look at the two different classes at . CountDownLatch CountDownLatchLiterally it is a counting tool class, in fact this class is a Java method for multi-thread counting. CountDownLatchThe internal realization is mainly dependent on AQSthe sharing mode. When a

Database Technologies

Record an android reverse engineering experience

1. Decompile dex2jarGenerate the jar file and then jd-guiview the class file apktoolUnzip the apk 2. Find related keywords apktoolSearch for such keywords in the decompressed project, find that its definition is in the string.xmlfile, and can be traced back public.xmlto its corresponding id. idSearch again to find the relevant files, and then go back jd-guito view the relevant logic (some of the methods are not converted into java code but byte code, maybe there are related preventive measures?)

Database Technologies

Dubbo timing task time wheel (Time Wheel) algorithm detailed explanation

1 Scheduled tasks Netty, Quartz, Kafka and Linux all have timing task functions. Conventional JDK tool classes such as java.util.Timer and DelayedQueue can implement simple timing tasks. The bottom layer uses a heap data structure, and the access complexity is O(nlog(n)), which cannot support massive timing tasks. In scenarios with a large amount of timed tasks and high performance requirements, in order to reduce the time complexity of task access and cancellation operations to O(1), a time whe

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