Programmer Group

We know that the bottleneck of a program is the database. We also know that the speed of memory is much faster than that of hard disk. When we need to retrieve the same data repeatedly, we request database or remote service again and again, which leads to a large amount of time spent on database query or remote method invocation, resulting in d ...

1. JSON Schema Third Party Auxiliary Tool JSON Schema already has a number of third-party assistive tools based on different languages. You can see the instructions on the official website for details: http://json-schema.org/implementations . Among these third-party tools, we focus on the third-party tools available in the Java language. Cur ...

Debug Entry Find the XmlConfigBuilder Test in the mybatis source code and run shouldSuccessfully Load XMLConfigFile () in debug mode. Initialization First, create the XMLConfigBuilder object, in the construction method: Reading files through InputStream to generate Document objects for XML, the operations related to XML are beyond the sc ...

Dynamic Sensing of Distributed Server Up and Down-line Function by zookeeper Dynamic Sensing of Distributed Server Up and Down-line Function by zookeeper Business Description Implementation of Server-side Implementation of Client test Business Description In a distributed system, the master node can have more than one, whi ...

In our projects, we usually use slf4j to log in this way:org.slf4j.Logger logger = org.slf4j.LoggerFactory.getLogger(Test.class);Start with this log Logger creation to see the source code:org.slf4j.LoggerFactory.getLogger(String name){ ILoggerFactory iLoggerFactory = getILoggerFactory(); //1 places return iLoggerFactory.getLogger(name); ...

Webbench is developed by Lionbridge. It mainly tests the number of requests per second and data transmission per second. It also supports static, dynamic and SSL. It is easy to deploy and can be tested both statically and dynamically. This paper introduces Nginx's stress testing using webbench. Stress testing is a very important work in op ...

log4j collation in production environment There are many improvements in the log of the company's java underlying code. This article mainly records the difficulties encountered in the process of improvement and records them in order to avoid forgetting (here I use log4j.propertes, not log4j.xml). How to configure log paths in non-web projec ...

A Brief Introduction to flume When you read this article, you should have a general understanding of flume, but in order to take care of the beginners, you will still say flume. When you first use flume, you don't need to understand too much about it. Just understand the following figure, you can use flume to transfer log data into kafka. ...

The project encountered a scenario where task logs need to be recorded on ActiveMQ. Actually AMQ itself has a Logging Plugin, but it is not always suitable for the actual scenario of the project. Think about it, just a while ago for other projects to do a MQTT protocol authentication plug-in, the technical basis has been, or write a customiz ...

In mybatis-spring, there's a comment called MapperScan, and we'll start with him today. When we add this comment, it represents the introduction of Bean s of the MapperScanner Registrar class. public class MapperScannerRegistrar implements ImportBeanDefinitionRegistrar, ResourceLoaderAware {} He's an example of ImportBean Definition Registrar ...