Realize the asynchronous output of the log through the Apache log4j framework
Realize the asynchronous output of the log through the Apache log4j framework
Summary:
In most applications, logs are very important for faults and analysis when problems occur.Apache Log4j is a widely used log management framework, which provides a powerful log function.However, in general, log output will block the execution of the application and reduce performance.To solve this problem, the asynchronous log output function of the log4j framework can make the log record no longer affect the performance of the application.
introduce:
Apache Log4j is a flexible and powerful log management tool that helps developers to effectively record the application and state of the application.It provides a variety of logging levels, which can be exported to multiple targets (such as consoles, files, databases, etc.), and supports flexible log filtration and formatting options.However, because the log record is performed simultaneously, it may have a negative impact on the performance of the application.
To solve this problem, the Apache Log4j framework introduces the concept of asynchronous log output.By recording logs asynchronous, applications can continue to execute without waiting for log records.This greatly improves the performance and response of applications.
The following is the steps of the asynchronous output of the log through the log4j framework:
Step 1: Add log4j dependencies
First, add the relevant dependencies of log4j to the construction file of the project.This can be completed by maven or manual adding dependencies.The following is an example of adding log4j dependencies using Maven:
<dependencies>
<dependency>
<groupId>org.apache.logging.log4j</groupId>
<artifactId>log4j-core</artifactId>
<version>2.14.1</version>
</dependency>
</dependencies>
Step 2: Configure log4j2.xml file
Create a log4j2.xml file in the resource directory of the project, and configure the output method and format of the log.The following is a basic example of log4j2.xml configuration file:
<?xml version="1.0" encoding="UTF-8"?>
<Configuration status="info">
<AsyncRoot level="info">
<AppenderRef ref="Console" />
</AsyncRoot>
<Appenders>
<Console name="Console" target="SYSTEM_OUT">
<PatternLayout pattern="%d{yyyy-MM-dd HH:mm:ss.SSS} [%t] %-5level %logger{36} - %msg%n"/>
</Console>
</Appenders>
<Loggers>
<Root level="info">
<AppenderRef ref="Console"/>
</Root>
</Loggers>
</Configuration>
In the above configuration, we define an asynchronous root logger and output the log to the console.You can modify the log output method and format as needed.
Step 3: Add asynchronous Appender
In the application code, you need to create an asynchronous APPENDER and add it to the logger of log4j.The following is an example code:
import org.apache.logging.log4j.LogManager;
import org.apache.logging.log4j.Logger;
import org.apache.logging.log4j.core.config.Configurator;
import org.apache.logging.log4j.core.LoggerContext;
public class ExampleClass {
private static final Logger logger = LogManager.getLogger(ExampleClass.class);
public static void main(String[] args) {
// asynchronous configuration
LoggerContext context = (LoggerContext) LogManager.getContext(false);
Configurator.initialize(context.getConfiguration());
context.start();
// Execute log records
logger.info("Hello, Log4j Async!");
// Stop the asynchronous log
context.stop();
}
}
In the above example, we first obtained the Logger instance and performed a log record statement in the application.We also made asynchronous configurations of log4j through LoggerContext and Configurator, and started and stop asynchronous logs.
in conclusion:
By using the asynchronous log output function of the Apache Log4j framework, we can effectively record the application of the application without worrying about performance issues.Through appropriate configuration and code implementation, the application can maintain high performance while not being affected by log over expenses.
