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March 5, 2020Programming
GoF's 23 Design Patterns Explained and Demonstrated: (1) Singleton Pattern — Lazy Singleton and Eager Singleton
The Singleton pattern is defined as a pattern where a class has only one instance and the class can create that instance by itself. It is mainly used to solve the frequent creation and destruction of objects, while ensuring logical correctness — for example, only one Task Manager can be opened in Windows, avoiding the waste of memory resources from opening multiple Task Manager windows, or errors such as inconsistent content shown in different windows.
ProgrammingDevelopmentJavaCode
March 4, 2020Programming
GoF's 23 Design Patterns Explained and Demonstrated: Overview
The term "design pattern" did not originally appear in software design, but in architecture. In 1977, the renowned American architect and director of the Center for Environmental Structure at UC Berkeley, Christopher Alexander, described common architectural design problems in his book A Pattern Language: Towns, Buildings, Construction and proposed 253 basic patterns for designing towns, neighborhoods, houses, gardens, and rooms. In 1987, Kent Beck and Ward Cunningham first applied Christopher Alexander's pattern ideas to the generation of graphical user interfaces in Smalltalk, but it did not draw the attention of the software community.
ProgrammingDevelopmentJavaCode
March 4, 2020Industry News
Google Cancels Its Annual Developer Conference Due to the Epidemic
Out of concern over the novel coronavirus epidemic, Google announced the cancellation of its 2020 I/O developer conference. Google I/O is the company's major annual event, originally scheduled for May 12–14 this year. Just days earlier, Google canceled its Cloud Next cloud computing event in San Francisco, moving it online.
News
March 3, 2020Programming
Spring Cloud Microservices Beginner Tutorial — Completed
If you have followed me from the first section to create the project and tried running my code (https://github.com/NeilRen/SpringCloudDemo), I believe you can now build a basic microservices architecture. Since this is a beginner tutorial, many things are not covered in depth or detail — the goal was simply to get a microservices architecture up and running. If I have time later, I will try to write an advanced tutorial covering Spring Security, message queues, database distributed master-slave setups, distributed log collection, and so on.
ProgrammingDevelopmentJavaCodeOpen SourceSpring
March 3, 2020Programming
Spring Cloud Microservices Beginner Tutorial (12): Spring Cloud Docker Containerized Deployment
After the previous section on service tracking and link monitoring, the basic microservices framework is nearly complete. Deployment in a microservices setup inevitably involves Docker, so how do we build a Docker image? In this section we'll cover packaging the code into an image file and uploading it to an image repository.
ProgrammingDevelopmentJavaCodeOpen SourceSpringDocker
March 2, 2020Industry News
Weimob Reviews the Database Deletion Incident: All Data Recovered, Compensation Plan Made, Management Held Accountable
Weimob stated that this incident severely impacted merchants' operations, and the company's management feels deep self-blame and guilt over it. To address this, Weimob has prepared a 150 million RMB compensation reserve.
OpsSecurityDatabaseNews
March 2, 2020Programming
Spring Cloud Microservices Beginner Tutorial (11): Spring Cloud Sleuth + Zipkin Service Tracing and Link Monitoring
In the previous section we covered circuit breaking and degradation, and we can basically build a fairly complete microservices architecture now. But a microservices architecture is distributed — each service runs independently while depending on others — so if a problem occurs, it's hard to trace where it is. We need a service-tracing solution, and Spring Cloud Sleuth provides service tracing and link monitoring.
ProgrammingDevelopmentJavaCodeOpen SourceSpring
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