547 posts
Everyone is familiar with train tickets — we've all taken the train. Now tickets are sold under real-name rules, and the ticket carries your ID number, name, and other real-name information. The ID number is masked with asterisks for four digits, but do you think it's safe to throw it away? As a programmer, I want to tell you that a program can quickly compute your possible ID numbers.
The previous section, 'Spring Cloud Microservices Beginner Tutorial (6): Spring Cloud BUS Message Bus for Dynamic Config Refresh,' already installed the RabbitMQ message queue and implemented the Spring Cloud Bus message bus. This section introduces Spring Cloud Stream message-driven microservices. You can use RabbitMQ, Apache Kafka, etc., for asynchronous message passing and receiving between microservices.
The previous section, 'Spring Cloud Microservices Beginner Tutorial (5): Centralized Config — ConfigService,' implemented unified config management. At the end I mentioned that config is only pulled automatically after a restart, so this section explains using the Spring Cloud BUS message bus to automatically update config files, which lets the application hot-reload config without a restart.
In the previous section, 'Spring Cloud Microservices Beginner Tutorial (4): Inter-service Invocation — FeignClient,' we covered creating microservices and consuming between them. As the number of microservices grows, so do the many Spring Boot programs, and modifying their config files becomes a terrifying workload. So the microservices architecture also provides a config center, which lets us conveniently manage our service config files centrally. At the same time, the production environment config is not open to developers, so only operations staff need to maintain the online config center.
In the previous section, 'Spring Cloud Microservices Beginner Tutorial (3): Service Registration,' we covered service registration. This section is about calls between services — acting as a service consumer to consume other services — and using FeignClient to call other services quickly and efficiently.
In the previous section we covered 'Spring Cloud Microservices Beginner Tutorial (2): Service Registration and Discovery — Eureka,' which set up the microservices registry and discovery center. This section explains how to create a new microservice and register it with the registry.
When we use IDEA to DEBUG code, the console often prints something like: 'Connected to the target VM, address: 127.0.0.1:62981, transport: socket'. So even if the code doesn't run locally, as long as the JVM has debug mode on and the network can connect to the JVM via socket, the Debug protocol over Socket communication can pass debug commands and debug info.
Have you ever complained at work about other people's messy commits — no note on why or what each commit did? When contributing to open-source projects on GitHub, if your commit doesn't follow their template, your merge request won't be accepted. Messy commits not only affect others; at release time the changelog should be auto-generated, but commits not written per the rules can't be tallied automatically. So today I'll write about how to commit gracefully on Git and auto-generate the changelog. This article only focuses on the posture of committing; the commit command and other topics are not discussed for now.
This section starts from scratch: we create a new Maven multi-module project and complete a basic demo of Spring Cloud Eureka-based service registration and discovery. The demo uses the IntelliJ IDEA development environment. Create a new Maven project in IntelliJ IDEA with JDK 1.8. I prefer manual operations, so first create an empty Maven project with groupId net.renfei, artifactId cloud, and version 1.0.0.
Adobe Zii is a small and handy utility that helps you forget the registration hassles of all your existing Adobe products.
