Programmer Group

order This paper mainly studies the consumemode.order of rocketmq ConsumeMode.ORDERLY rocketmq-spring-boot-2.0.4-sources.jar!/org/apache/rocketmq/spring/annotation/ConsumeMode.java public enum ConsumeMode { /** * Receive asynchronously delivered messages concurrently */ CONCURRENTLY, /** * Receive asynchronously deli ...

This blog series is a summary of the learning process of concurrent programming.Because there are many articles and the writing time is scattered, I organized a catalog paste (portal) for easy reference. Concurrent Programming Series Blog Portal Preface As mentioned in previous articles, JMM is a reflection of the memory model specification in ...

In order to better understand the automatic configuration and working principle of spring boot, let's write a spring boot Hello starter today. This process is very simple, not much code. Let's see how to start. ##1. New maven project. This is not a demonstration. If you can't do it yourself, baidu... Lala, because it's too simple 2. Create a ne ...

Eureka is Netflix's open source service registration and discovery component. Common Service Registration and Discovery Components Zookeeper,Eureka Eureka Service Registration and Discovery Principles Services are registered with the registry Get additional registry service configurations Create Eureka Server Create a project using Spring In ...

The next week I came to the company, I received a development request for a timed task: Send a user report mail every morning at 10:00 a.m.It's a little embarrassing that the new recruits didn't do this.) so decided to write step by step, export from excel - > mail send - > timer implementation - > mapper layer return set receive, the ...

1. What is AOP Aspect-oriented programming (AOP), also translated as Aspect-oriented programming and Profile-oriented programming, is a program design idea in computer science. It aims to further separate cross-cutting concerns from business entities to improve the modularity of program code.By adding an additional Advice mechanism to the exis ...

Spring boot integrated global exception handling Preface For normal MVC projects, a large number of exceptions need to be handled by us. In this way, our Controller layer has to make exceptions in the try catch service layer. In this way, each method body of the Controller layer needs to write some templated try catch code, which is very diffic ...

Absrtact: in fact, it's a very simple way to deal with it. It's not elegant enough, or fast JSON has not been found to provide a convenient way to deal with it. So record the process of dealing with the problem. Objective: all api requests, i.e. responses, are processed in a unified format for the content of application [JSON]. For example: the ...

Using websocket can realize full duplex communication between client and server, and the bottom layer is tcp protocol. Principle and concept please Baidu. . First, we use idea to build a simple web project, and use maven to manage project dependencies. Add spring spring MVN support capability for the project, and add pom depen ...

Preface This article will simply integrate Redis based on springboot 2.1.8.RELEASE, which is suitable for beginners Introduction to Spring Boot integrated Redis 1. Introduce redis dependency in pom.xml <!-- Redis rely on --> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-s ...