Programmer Group

introduction In the previous blog post, the database desensitization scenario and scheme have been completely introduced. The sharding JDBC open source project from Jingdong Digital Technology Co., Ltd. has realized this function transparently through the way of data source intermediate agent. However, although the function has been realized, ...

In our daily development, void judgment should be the most commonly used operation. Therefore, commons lang3 package is always necessary in the project. This package provides us with two methods for void determination, namely StringUtils.isEmpty(CharSequence cs) and StringUtils.isBlank(CharSequence cs). Let's see the difference between the two ...

In modern programming languages, programmers who have been exposed to multithreaded programming have a certain understanding of locks. In short, the lock in multithreading is a mechanism to ensure the consistency of shared resources when multiple threads modify shared resources in multithreading environment. We will not expand here. In the dis ...

What is Middleware? Middleware is software that is assembled into application pipelines to process requests and responses. Each component: Choose whether to pass the request to the next component in the pipeline. You can perform work before and after calling the next component in the pipeline. Request delegates are used to build the requ ...

Preface CountDownLatch and Cyclic Barrier are two important tool classes for concurrent java programming. They are widely used in many multithreaded concurrent or parallel scenarios.However, each has its own emphasis on the internal implementation and use scenarios. Internal implementation differences The former relies more on classical AQS m ...

Kong is a cloud-native, fast, scalable, and distributed Microservice API Gateway background Although Kong has reached 2.0, because the previous expansion development was based on Kong 1.2.1, the source code and development environment construction of Kong are based on Version 1.2.1. The subsequent versions can follow this process, but t ...

Kong is a cloud-native, fast, scalable, and distributed Microservice API Gateway background Although Kong has reached 2.0, because the previous expansion development was based on Kong 1.2.1, the source code and development environment construction of Kong are based on Version 1.2.1. The subsequent versions can follow this process, but t ...

Mainly paste code Make a summary for yourself (connection server initialization and processing): 1. NioEventLoop is used to positively handle io connection 2.NioEventLoopGroup can be simply understood as two processing groups, one is accepting connection, the other is processing connection, and the chooser in it is NioEventLoop array Server ...

As we all know, Java Object objects provide interfaces such as wait() and notify()/notifyAll(), which are important parts of concurrent programming. They play a very important role in the cooperation between multi threads, and there are many scenarios that can be used in the actual development. Needless to say, today we will use this mechanism ...

——Notes on deep understanding of Java virtual machine JVM advanced features and best practices Let's start with a piece of code public class Human {} public class Man extends Human{} public class Woman extends Human{} public class FulynDemo { public void sayHello(Human arg) { System.out.println("i am human"); } p ...