如何销毁log4j记录器实例

Question

我有一个并发运行代码，每次运行都需要在文件中记录一些内容。每个执行-新的故事与唯一的文件。

事先谢谢你，安德烈！

Answer 1

您不能销毁/清理Appender实例。但是您可以使用Log4j2工具箱改进解决方案。

在Log4j中将事情路由到动态文件是可能的，但大多数时候文件中的标记就足够了，或者至少是更复杂路由的起点。

请仔细阅读它的文件。特别是最后一段对你的案例很重要：

null

我使用了这个简单的测试脚本，请注意为扫描程序中的每一行创建的标记的使用。在您的情况下，它将通过配置或Servlet输入或类似的方式创建。

package toTest;

import java.util.Scanner;
import org.apache.logging.log4j.Level;
import org.apache.logging.log4j.LogManager;
import org.apache.logging.log4j.Logger;
import org.apache.logging.log4j.Marker;
import org.apache.logging.log4j.MarkerManager;

public class TestMe {
    private final Logger myOneAndOnlyLogger = LogManager.getLogger("MyCentralName");
    public static void main(String[] args) {
        new TestMe().doMyThing();
    }

    private void doMyThing() {
        Scanner input = new Scanner(System.in);
        String line = "";
        while(!line.equals("QUIT")) {
            System.out.println("Line: ");
            line = input.nextLine();
            Marker forThisRound = MarkerManager.getMarker(line);
            myOneAndOnlyLogger.log(Level.ERROR, forThisRound, "1");
            myOneAndOnlyLogger.log(Level.ERROR, forThisRound, "2");
            System.out.println("Line done.");
        }
    }
}

和这个log4j2.properties（我手边有一个滚动文件示例，模式中有标记）：

status = error
name = MarkerExample

#Make sure to change log file path as per your need
property.filename = /tmp/java/marker.log

filters = threshold

filter.threshold.type = ThresholdFilter
filter.threshold.level = debug

appenders = rolling

appender.rolling.type = RollingFile
appender.rolling.name = RollingFile
appender.rolling.fileName = ${filename}
appender.rolling.filePattern = /tmp/java/debug-backup-%d{MM-dd-yy-HH-mm-ss}-%i.log.gz
appender.rolling.layout.type = PatternLayout
appender.rolling.layout.pattern = %d{yyyy-MM-dd HH:mm:ss} $${marker:} %-5p %c{1}:%L - %m%n
appender.rolling.policies.type = Policies
appender.rolling.policies.time.type = TimeBasedTriggeringPolicy
appender.rolling.policies.time.interval = 1
appender.rolling.policies.time.modulate = true
appender.rolling.policies.size.type = SizeBasedTriggeringPolicy
appender.rolling.policies.size.size=10MBONE
appender.rolling.strategy.type = DefaultRolloverStrategy
appender.rolling.strategy.max = 20

loggers = rolling

#Make sure to change the package structure as per your application

logger.rolling.name = MyCentralName
logger.rolling.level = debug
logger.rolling.additivity = false
logger.rolling.appenderRef.rolling.ref = RollingFile