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The function of dlsym function is to obtain the address of symbols (global variables and function symbols) from the shared library (dynamic library). It is usually used to obtain the address of function symbols, which can be used to wrap the functions in the shared library; The following is the function prototype and the header file to be inclu ...

1. Kafka concept Kafka is a distributed message system with high throughput. It is similar to HDFS, which is used to store data. However, HDFS is persistent and file data will be retained all the time. Kafka only stores data for a period of time and will be automatically deleted if it is not consumed for a long time. At the same time, the stor ...

Redis: Basic Recommended java3y: https://mp.weixin.qq.com/s/SdE6MR9g-v93ZtJPme9e8Q 1: What is Redis? Redis is a memory cache database. The full name of redis is: remote dictionary server (remote data service), which is written in C language. Redis is a key value storage system (key value storage system), which supports rich data types, su ...

What is a template engine? [function] the template engine is created to separate the user interface from the business data (content). It can separate the Servlet Java code and Html web page code (this is the advantage of the template engine compared with the Servlet directly returning to the dynamic page) Principle / process Thymeleaf ...

In this article, we will discuss the most commonly used Converter Design Pattern in Java / J2EE projects. Because the Java 8 function not only provides a general two-way conversion between corresponding types, but also provides a common method to convert a collection of objects of the same type, so as to reduce the template code to an absolute ...

Deadlocks can only occur in concurrent (multithreaded) programs, where synchronous (using locks) threads access one or more shared resources (variables and objects) or instruction sets (critical areas).When we try to avoid deadlocks during livelocks, asynchronous locking will be used. Multiple threads compete for write operations on the same se ...

Network data collection refers to the automatic collection of data on the Internet through programs. The program used to collect data is also called Web crawler. This paper mainly records some common modules of online data collection and their simple related operations. ⚪ urllib module and its request sub module It is an indispensable ...

WedgepostMessage It is commonly used in embedded iframe or Web Workers for cross page (thread) message communication. Similar shadows can be seen in some other development environments, such as Chrome plug-in environment, Electron environment, sigma plug-in, etc.In recent work, we often deal with iframe and Web Workers, deal with pages and embe ...

Previously, in the SpringBoot project, I have been using RedisTemplate to operate the data in Redis, which is also the way officially supported by Spring. Compared with Spring Data's support for MongoDB and ES, this way of using Template is really not elegant! Recently, RedisOM, Redis's exclusive ORM framework, has been officially launched by R ...

1, ForewordThe first part mainly introduces the basic environment configuration during jenkins deployment. This part introduces how to use jenkins to publish the project to the remote server2, Project deployment release1. New taskEnter the task name, select build maven project, and click OK2. Parametric build process (optional)Note: the paramet ...