Programming

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March 1, 2020Programming
Spring Cloud Microservices Beginner Tutorial (10): Spring Cloud Hystrix Circuit Breaking and Service Degradation
In the previous section we covered the API gateway, which lets multiple services be published uniformly through the gateway. Before publishing, we also need to understand a mechanism in microservices — circuit breaking and service degradation, called Hystrix in Spring Cloud. This section integrates Hystrix to implement circuit breaking and degradation. Hystrix has many features; we only cover the most commonly used circuit breaking and degradation mechanisms.
ProgrammingDevelopmentJavaCodeOpen SourceSpring
February 29, 2020Programming
Spring Cloud Microservices Beginner Tutorial (9): Zuul Gateway Integrating Swagger2 for Auto-generated RESTful API Docs
In the previous section we covered Spring Cloud's API gateway Zuul. As service interfaces grow, we also need a tool to manage the interface documentation, so in this section I introduce Swagger. It is not part of the microservices architecture, but it is very practical, so I included it in the beginner tutorial. Swagger can not only visualize interfaces as documentation, but also test online and generate SDKs. This section mainly covers integrating Swagger; we won't go into Swagger usage in detail — I'll write a dedicated tutorial on that later.
ProgrammingDevelopmentJavaCodeOpen SourceSpring
February 28, 2020Programming
Spring Cloud Microservices Beginner Tutorial (8): Spring Cloud Zuul API Gateway Dynamic Routing, Cookie Passing, and CORS
In the previous section we covered asynchronous communication between microservices via message queues. This section introduces the API gateway in microservices, Spring Cloud Zuul, which can centrally manage numerous interfaces and provide load balancing, among other functions.
ProgrammingDevelopmentJavaCodeOpen SourceSpring
February 27, 2020Programming
The ID-number Masking Flaw on Train Tickets Can Reveal Your ID Number
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.
ProgrammingCodeSecurity
February 26, 2020Programming
Spring Cloud Microservices Beginner Tutorial (7): Spring Cloud Stream Message-driven Microservices
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.
ProgrammingDevelopmentJavaCodeOpen SourceSpring
February 24, 2020Programming
Spring Cloud Microservices Beginner Tutorial (6): Spring Cloud BUS Message Bus for Dynamic Config Refresh
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.
ProgrammingDevelopmentJavaCodeOpen SourceSpring
February 23, 2020Programming
Spring Cloud Microservices Beginner Tutorial (5): Centralized Config — ConfigService
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.
ProgrammingDevelopmentJavaCodeOpen SourceSpring
February 21, 2020Programming
Spring Cloud Microservices Beginner Tutorial (4): Inter-service Invocation — FeignClient
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.
ProgrammingDevelopmentJavaCodeOpen SourceSpring
February 20, 2020Programming
Spring Cloud Microservices Beginner Tutorial (3): Service Registration
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.
ProgrammingDevelopmentJavaCodeOpen SourceSpring
February 19, 2020Programming
Detailed Tutorial: Remote Code DEBUG with IntelliJ IDEA
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.
ProgrammingDevelopmentJavaCodeIDEA