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Source of this article Principle analysis of AbstractQueuedSynchronizerReprint please specify Abstract queuedsynchronizer, AQS for short, is a common dependency framework for most of Java, such as Lock, Semaphore, CountDownLatch, etc., which implements blocking locks that rely on FIFO waiting queues. Reading its code principle is helpful for us ...

Last week, I put my words out. It seems that all my friends are looking forward to it. In fact, SongGe can't wait to start a new series. However, the current Spring Security series is still in the process of serialization and has not been completed yet. It's a series of events. Keep your spirits up, and then you'll lose three times. It must be ...

First of all, don't be afraid of some nouns. In fact, they are all reasonable things. The reference itself is well understood. The reference type data stores the memory address of the actual object. When garbage collection, it depends on whether the object has a reference. Java does not need developers to allocate memory and free memory, but it ...

TCP sticking / unpacking TCP is a "flow" protocol. The so-called flow is a string of data without boundary. You can think of the running water in the river. They are connected in one piece and there is no boundary between them. The bottom layer of TCP does not know the specific meaning of th ...

Title: As we all know, TT has a magic meow at home. This meow is very sleepy. There is no day or night when you sleep. Meow meow can sleep many times a day!! Sleep as long as you want Meow sleep time is continuous, that is, once meow starts to sleep, it can not be disturbed, otherwise meow will bite peo ...

Python crawler example: News total crawling preface analysis Web page parsing Stock data source Proxy IP code implementation summary preface Some time ago, due to the needs of tasks, it was necessary to climb the number of news of Shanghai Stock Exchange 50 index component stocks on certain da ...

chrome + IDM + oil monkey plug-in realizes the high-speed download of large files on Baidu online disk; this is a very mature technology, with fast download speed and no need to worry about being sealed 1. Download chrome. If you skip it directly, you don't need to read it 2. Download idm software ...

After analyzing the loading of BeanFactory containers, let's take a look at the loading of ApplicationContext, a more complex container that we currently use. Compared with BeanFactory, ApplicationContext has the following differences: 1. Inherit MessageSource and provide international standard access p ...

First C#Program using System; namespace HelloWorldApplication // Namespace Declarations { /* Class name is HelloWorld */ class HelloWorld // A class { /* main function */ static void Main(string[] args) { /* My First C#Program */ Console.WriteLine("Hello World!"); Co ...

If Maven's dependency is not handled properly, it often leads to some problems, which is very annoying. Today I'd like to share with you a dependency related problem that you may have encountered before. Problem background There is an ES search project, which is still in good condition at the beginning. After a while, it is found that the start ...