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  Original: https://www.cnblogs.com/dafanjoy/p/10904347.html First, let's look at the core variables ThreadPoolExecutor uses to represent the state of the thread pool   //Used to mark thread pool state (3 bits high), number of threads (29 bits low) //The default is RUNNING state with 0 threads private final AtomicInteger ctl = new Atomi ...

Summary CountDownLatch and CyclicBarrier are similar, and they are often compared. This time, the author tries to analyze the two classes respectively from the source point of view, and from the source point of view, see the differences between the two classes. CountDownLatch CountDownLatch is literally a counting tool class. In fact, this clas ...

[overview] There are at least three schemes to realize the identity authentication function based on face recognition: 1. Use the cloud services provided by major platforms, and call based on WEB API. API calls are charged per call. 2. Use SDK, embedded in the device. In this case, you need to develop your own hardware, and the SDK needs to be ...

Recently, several colleagues of the Department have been wronged and left one after another. They are reluctant to leave when they have been working together for three years. After all the formalities have been properly handled, they are sent out of the company after greetings. Several elder brothers laugh at me when they leave. I immediately f ...

In spring webmvc, all requests start with a class called dispatcher servlet. It is the hub of request dispatch, often referred to as the front-end controller, also known as the request dispatcher. From the derived relationship, we can see that the dispatcher Servlet is also a Servlet. When we map the / path to the dsiaaptcherservlet, all reque ...

Python because of the simplicity of the language, let's write code in the way of human thinking, it's easier for the novice to start, and the old bird can't let go. To write python (elegant, authentic and neat) code, and to observe the big bull code more often, there are many excellent source codes on Github that are worth reading, such as req ...

This article mainly reveals the loading of Spring Cloud Gateway and how to handle the request process from the source point of view. 1. Overview of spring gateway Spring Cloud Gateway is an official gateway developed by spring based on Spring 5.0, Spring Boot 2.0, Project Reactor and other technologies. Spring Cloud Gateway aims to provide a ...

1, Installation and release according to official instructions 2, New customized Models and controllers 1. Create a new database table (it is recommended to directly create a table in the database. If you want to try, you can also create a table in migrations. Please refer to the PHP artican command for details) 2. Create models through PHP ...

scene There are times when enumeration types are used. For example, if an int list is passed, the corresponding chekbox should be selected according to the list. First, create a new class KillComponents public enum KillComponents { /// <summary> /// Upper atomizer /// </summary> ShangWuHua = ...

The INCR key of redis implements simple traffic statistics redis INCR document File thinking For example, use the incr of redis to write a method on the details page to make auto statistics on the visit. Get all the key s of incr and display them in order It should be noted here that keys cannot be used when taking all keys. Because red ...