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To implement a reverse proxy for caching data, the first idea is to start from response The data is read from the body, and then returned to the requesting client and the local Cache module respectively. The pseudo code is as follows: func HandleResponse(rw http.ResponseWriter, resp *http.Response) { bodyBytes, _ := ioutil.ReadAll(re ...

HashMap is a collection container that senior java engineers must be proficient in. Its importance is almost equal to the importance of Volatile in concurrent programming (visibility and order). Through the detailed explanation of graphic source code, this article deeply analyzes the important kernel knowledge of HashMap, which is easy to read ...

Singleton pattern is the most commonly used pattern in design patterns. It belongs to object creation mode, which can ensure that only one instance of a class is generated in the system. Such behavior can bring two benefits: For frequently used objects, the time spent creating objects can be omitted, which is a very considerable overhead for t ...

When operating on the same resource, a single cache read is no problem, but what to do when concurrency exists. In order to avoid data inconsistency, we need to perform a "lock" operation before operating the shared resource. We are developing many business scenarios that use locks, such as inventory control, lucky draw, second kill, ...

This article mainly introduces the organizational structure of Python programs. Interested partners can refer to it. Organizational structure of the program Sequential structure The program executes the code from top to bottom without any judgment and jump until the end of the program. Boolean value of the object All Python object ...

background SMP(Symmetric Multi-Processor) Symmetric multiprocessor architecture is a widely used parallel technology compared with asymmetric multiprocessing technology. In this architecture, a computer is composed of multiple CPUs and shares memory and other resources. All CPUs can access memory, I/O and external interrupts equally ...

preface We all know what transactions are, and Spring transactions use AOP to provide declarative and programmatic transactions on the database to help us simplify development and decouple business logic and system logic. But what is the principle of Spring transactions? How do transactions propagate between methods? Why do transactions fail s ...

Using fluent mybatis, you don't have to write specific xml files. You can construct more complex business sql statements through java api to achieve the integration of code logic and sql logic. You no longer need to assemble queries or update operations in Dao, or reassemble parameters in xml and mapper. Compared with native Mybatis, Mybatis Pl ...

Logback is an old logging framework in JAVA. It has been iterating for more than ten years since its first version in 2006. However, the latest stable version of logback is still in 2017 and has not been updated for several years; The last stable version of logback's brother slf4j is also 2017, which means it's a little cool. Moreover, the asy ...

This article is transferred from: Le byteThe article mainly explains: KafkaFor more Java related information, you can pay attention to the official account number: 999Asynchronous communication principleObserver modeObserver mode, also known as Publish/Subscribe modeDefine a one to many dependency between objects, so that whenever an object cha ...