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1, Introduction to MDC MDC (Mapped Diagnostic Contexts) maps diagnostic contexts. This feature is a function provided by logback to facilitate logging under multi-threaded conditions. Some applications use multithreading to process requests from multiple users. During the use of a user, there may be multiple different threads to process. A typ ...

1. Prefix, infix, suffix expression 1.1 prefix expression (Polish expression) Prefix expression is also called polish. The operator of prefix expression is before the operand, Examples: (3 + 4) × The prefix expression corresponding to 5-6 is [- x+3456] Computer evaluation of prefix expressions Scan the expression from right to ...

Introduction to RocketMQ For detailed explanation, you can view the following documents: rocketmq Basics RocketMQ It is an open source distributed messaging system, based on high availability distributed cluster technology, which provides low latency and highly reliable message publishing and subscription services. At the same time, it is wid ...

Today, I want to talk about the monitoring function in Druid. Druid database connection pool is believed to have been used by many small partners. Personally, I feel that Druid is a relatively successful open source project of Alibaba. Unlike Fastjson, Druid has always been excellent in all aspects. It has complete functions and is easy to use ...

1. Overview of network programming Java is a language on the Internet. It provides support for network applications at the language level. Programmers can easily develop common network applicationsThe network class library provided by java can realize painless network connection. The underlying details of networking are hidden in the Java Nati ...

1. During springboot startup, the bean definitions to be loaded will be collected and added to BeanFactory as BeanDefinition objects. Since there are only getBean and other methods to obtain bean objects in BeanFactory, adding BeanDefinition to BeanFactory is through void registerBeanDefinition(String beanName, BeanDefinition beanDefinitio ...

When you first learn threads, you always confuse the run method and the start method. Although they are two completely different methods, they are difficult to distinguish when you first use them. The reason is that the effect seems to be the same when you first use them. The following code is shown:public static void main(String[] args) { ...

In this article, let's take a look at LiveData in Android architecture components. Compared with ViewModel, LiveData has life cycle awareness, that is, it combines ViewModel with lifecycle. When the data of the application is updated, we generally only want to update the UI when the application is visible to the user; Further, if the applicatio ...

Generics play an important role in java, which can be seen in both open source framework and JDK source code. It is no exaggeration to say that generics are essential elements in general design, so it is a required course to truly understand and correctly use generics. 1: Generic essence Java generics is a new feature introduced in JDK 5. ...

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