Articles
Advanced Java

Write a rpc framework from 0.5 to 1-3: remote service call (thrift)

This is similar to the previous one, except that the framework of remote calling is changed. If you are interested, you can implement more ways. Here is only one attempt.thrift is Facebook's open source rpc framework, based on TPC, using binary by default.You need to master the basic usage of thrift first: thrift-Java exampleProject structure-acuprpc + acuprpc-core //server/client core processing logic + acuprpc-protocol-thrift //Remote call based on thrift + acuprpc-spring-boot-starter //server

... Steven
schedule 4 min read
Advanced Java

Spring cloud custom configuration source and configuration refresh

You can access your own configuration service through a custom configuration source, and cooperate with ContextRefresher to automatically update the configuration while the application is running.Implement PropertySourceLocator/** * Custom configuration source */ public class MyPropertySourceLocator implements PropertySourceLocator { @Override public PropertySource<?> locate(Environment environment) { String msg = new SimpleDateFormat("HH:mm:ss").format(new Date()); Map<String, Object&g

... Alejandro
schedule 2 min read
Advanced Java

Java concurrent thread pool --- it is enough to understand ThreadPoolExecutor

Summary: The feature of the thread pool is that after the number of threads = corePoolSize, only after the task queue is full, will a task be taken from the task queue, and then a new thread will be constructed, and iteratively until the number of threads reaches the maximumPoolSize to execute the rejection strategy .Thread pool-intsmazeThe idea of ​​the thread pool is: to open up an area in the system, which stores some standby threads, this area is called the thread pool. If there is a task th

... Ashley
schedule 13 min read
Advanced Java

Storm from entry to giving up (1), storm introduction

Background: I am currently working for the largest IT consulting company in China. It happens to be the graduation season. My department has recruited more than 20 fresh graduates. I want to conduct a one-month big data induction training with newcomers in the department. Hereby I will share the compiled documents come out. Storm is an open source distributed real-time computing system that can handle a large number of data streams simply and reliably. Storm supports horizontal expansion and is

... Jason
schedule 8 min read
Advanced Java

The realization and principle of storm 1.0 version sliding window

Sliding windows are widely used in monitoring and statistics application scenarios, such as counting the number of requests or the number of exceptions in the last 30s at regular intervals (10s), and taking corresponding measures according to the number of requests or exceptions. Before the storm 1.0 version, there was no implementation of the sliding window, and the developer needed to implement the function of the sliding window (the implementation principle of the sliding window before the st

... Patrick
schedule 7 min read
Advanced Java

The principle of sqoop relational data migration and why the memory on the map side will not explode

Sequence: The map client uses jdbc to send query statements to the database, and will get all the data to the map client. The principle of installing jdbc, the data is all cached in the memory, but the memory does not burst. This is because after 1.3 , Optimized jdbc, improved the internal principle of jdbc, and wrote data to disk for storage.Discuss the original text with the author:  Sqoop is a tool of "Transfer data between Hadoop and relational database server" under apache . The Sqoop

... Lincoln
schedule 11 min read
Core Java

"A system error occurred" 1067 when mysql startup under windows

Remember:The file name does not need to start with s, such as softI installed mysql under windows today, and an error of'system error 1067' occurred during startup.When this error occurs, go to Computer Management -> Event Viewer -> Manage Event Summary and find MySQL to view the latest error.After clicking the error, the error message will be listed in the general columnMy error message is:Can't find messagefile'D:\ oft\mysql-5.6.32-winx64\mysql-5.6.32-winx64\share\errmsg.sys'This error c

... Hunter
schedule 1 min read
Core Java

50 microservice interview questions that you must master when entering a major factory

Top microservice interview questionsAccording to Gartner, microservices are a new application platform for cloud development. Microservices are independently deployed and managed. Once implemented in a container, they have very little interaction with the underlying operating system. Therefore, if you plan to start your career in microservices, now is the time to dive into the nascent state of technology. Therefore, in order to help you prepare for the interview, I have put up a microservice int

... Adrian
schedule 20 min read
Core Java

Uber Microservice Architecture-Build and deploy applications

In this blog, you will learn about the following:Definition of microservice architectureKey concepts of microservice architecturePros and cons of microservice architectureUber case studyYou can refer to what is a microservice to understand the basic principles and advantages of microservices.If I give you the definition of microservices, it will be fair. Therefore, there is no proper microservice/microservice architecture definition, but it can be said that it is a framework composed of small,

... Angelina
schedule 7 min read
Java Back End Development

How to solve the gradle project encoding compatibility problem

Development environment: Versions below 1.idea2020, 2.gradle5.6.4 3.consul1.8.0 4.springBoot Encoding compatibility problems may occur in the above environment under the window environment, and an error related to encoding problems may be reported at startup. At present, this platform has not found this problem in the Apple system. Investigate the reason. The idea version of the Apple system uses the system encoding by default. The default is UTF8. It can perfectly support gradle, and the window

... Logan
schedule 2 min read
Java Back End Development

Resolve maven's pom reference jar package conflict in IDEA

PrefaceSometimes, we need to add a new function to the system, and may need to introduce a new pom dependency. After everything is done, we run the program but find that it reports NoClassDeFoundError, or other inexplicable problems. At this time, it is very likely that a jar package in the newly introduced pom dependency conflicts with the existing system.So, where do you start?solution1.mvn dependency:treemvn dependency:tree can display all jar packages (including transitive dependencies) com

... Layla
schedule 5 min read
Java Back End Development

Tencent T4 in-depth analysis of Java multithreading

Multithreading in javaTo achieve multithreading in Java, there are two methods, one is to continue the Thread class, and the other is to implement the Runable interface.For a class that directly inherits Thread, the general code framework is:class class name extends Thread{ method 1; Method 2; … public void run(){ //other code... } Attribute 1 Property 2; … }Let's look at a simple example:/** * @author Rollen-Holt inherits the Thread class and directly calls the run method * */ class hello exten

... Austin
schedule 19 min read
Java Back End Development

List of jvm runtime environment attributes

Foreword:In the web programming technology insider, I saw an example of using apache component to download files. For the setRepositoryPath method of the DiskFileUpload class, set the storage path of the temporary file, which indicates that if the method is not called, the absolute path is specified. Then the value of the environment property "java.io.tempdir" will be used. Thinking that I haven't encountered this environmental attribute before, here is a list of all environmental attributes. co

... Grace
schedule 2 min read
Java Back End Development

Import tomcat source code into eclipse

Foreword:After writing the original version of the socket app, there are still many expected functions that have not been implemented, and many problems have been found in the process of writing. Because I have roughly read the principle analysis of tomcat implementation before, I know that tomcat is actually a web server written in pure java, and it uses socket communication. So I especially want to see how tomcat handles these problems.The main steps:1. Go to the official apache website to dow

... Ruby
schedule 4 min read
Java Back End Development

Import spring source code into eclipse

Preconditions:1. Install jdk correctly, and configure JAVA_HOME and PATH. (I installed jdk1.8 here)2. Install eclipse correctly. (My eclipse version is: Neon Release (4.6.0))step:1. First, download the spring source code  https://github.com/spring-projects/spring-framework/releases . Because my jdk version is 1.8, the version I downloaded here is 4.3.2.After the download is complete, unzip it to a local directory.2. The compilation of spring source code requires gradle support, so you need

... Adeline
schedule 4 min read
Java Web Development

One article to understand Swagger, let you understand the benefits of using Swagger!!!

Front and rear separation defectsBefore understanding Swagger, you need to know what is front-end separationThe present eraSpringBoot + VUE... etc.Previous eraSSM + JSP template engine ====> back-end programmerEra of separation of front and back endsBack-end: back-end control layer + service layer + data access layerFront end: front end control layer + view layerForged back-end interactive data, json data already exists, no need to pass in json data from the back-end, front-end engineering ca

... Miles
schedule 8 min read
Java Web Development

Understand the technical architecture and principles of CDN in one article

The origin of CDNThe full name of CDN is Content Delivery Network, that is, Content Delivery Network. Allow users to obtain the required content nearby, solve the congestion of the Internet network, and improve the response speed of users visiting the website.N0.1 Minimum scale stage: 1 server, for all usersN0.2 Scale expansion stage: 2 servers for users in different regionsNO.n Scale expansion stage again: n+ servers, for users in different regionsUsers can access the server nearbyImprove user

... Melody
schedule 7 min read
Java Web Development

The GitEmoji specification you didn't know

Introduction to Emoji Japanese: 絵文字/えもじemoji is a visual emotional symbol used in wireless communication in Japan. It refers to pictures and text refers to characters. It can be used to represent a variety of expressions, such as smiling faces for laughter, cakes for food, etc. emoji Frequently appear in our chat records, Moments of friends, and even many times we will use emoji instead of text to chat, and then to convey everything we want to express.As a programmer, the commonly used code host

... Nathan
schedule 3 min read
Java Web Development

One article to understand Swagger, let you understand the benefits of using Swagger!!!

Front and rear separation defectsBefore understanding Swagger, you need to know what is front-end separationThe present eraSpringBoot + VUEPrevious eraSSM + JSP template engine ====> back-end programmerEra of separation of front and back endsInteraction through related API interfacesThe front and rear ends are relatively independent and loosely coupledThe front and back ends can be deployed on different serversForged back-end interactive data, json data already exists, no need to pass in json

... Jesse
schedule 8 min read
Java Web Development

An article proficient in MySQL transaction rules

Introduction: Every programmer learning database can't do without MySQL, and learning MySQL must learn affairs. Today we will learn about MySQL affairs together; The concept of affairsIn actual business development, some business operations require multiple access to the database. A business needs to send multiple SQL statements to the database for execution. A function (transaction) is composed of multiple SQL statements . The operations that access the database multiple times need to be execut

... Daniel
schedule 6 min read
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