java - 动态创建 Logback Loggers 和 Appenders

Question

我需要为动态加载和重新加载的类动态创建 Logback 记录器和各种位。这些类(class)的数量不定，但总共不到 150 个。性能是一个大问题，这是一个高度线程化和极度并发的环境，因此使用 MDC 的想法不会实现，因为当出现问题时每秒可能有数千次调用。我也不想直接将记录器传递到类中，我希望他们像典型的那样使用 getLogger 将它们从空中拉出来。

每个类都必须将它的所有错误消息记录到它自己的错误文件中，并将它的所有跟踪消息记录到它自己的跟踪文件中。这两个文件都需要每晚滚动。此外，系统中记录的任何内容也必须最终出现在主系统日志中。

我创建了以下代码片段来尝试这个想法。看起来它会起作用，但结果不是我所期望的。下面是可以直接运行的测试程序:

package logbacktesting;

import ch.qos.logback.classic.Level;
import ch.qos.logback.classic.Logger;
import ch.qos.logback.classic.LoggerContext;
import ch.qos.logback.classic.encoder.PatternLayoutEncoder;
import ch.qos.logback.classic.filter.LevelFilter;
import ch.qos.logback.core.rolling.RollingFileAppender;
import ch.qos.logback.core.rolling.TimeBasedRollingPolicy;
import ch.qos.logback.core.spi.FilterReply;
import ch.qos.logback.core.util.StatusPrinter;
import org.slf4j.LoggerFactory;

public class Main {

    public static void main(String[] args) {

        Logger templateLogger = (ch.qos.logback.classic.Logger) LoggerFactory.getLogger("com.myapp");
        LoggerContext loggerContext = templateLogger.getLoggerContext();

        String[] nameList = new String[] {"test1.class", "test2.class"};

        // Set up the pattern
        PatternLayoutEncoder encoder = new PatternLayoutEncoder();
        encoder.setContext(loggerContext);
        encoder.setPattern("%d{HH:mm:ss.SSS} [%thread] %-5level %logger{36} - %msg%n");
        encoder.start();

        // Spin over the names to create all the needed objects
        for(int i = 0; i < nameList.length; i++) {

            String name = nameList[i];

            // Set up the roll over policies and the name when it rolls over
            TimeBasedRollingPolicy tracePolicy = new TimeBasedRollingPolicy();
            tracePolicy.setContext( loggerContext );
            tracePolicy.setFileNamePattern( name + "-Trace-%d{yyyy-MM-dd}.log" );
            tracePolicy.setMaxHistory( 30 );

            TimeBasedRollingPolicy errorPolicy = new TimeBasedRollingPolicy();
            errorPolicy.setContext( loggerContext );
            errorPolicy.setFileNamePattern( name + "-Error-logFile.%d{yyyy-MM-dd}.log" );
            errorPolicy.setMaxHistory( 30 );

            // Set up the filters to ensure things get split as expected
            LevelFilter traceFilter = new LevelFilter();
            traceFilter.setContext( loggerContext );
            traceFilter.setLevel( Level.TRACE );
            traceFilter.setOnMatch( FilterReply.ACCEPT );
            traceFilter.setOnMismatch( FilterReply.DENY );

            LevelFilter errorFilter = new LevelFilter();
            errorFilter.setContext( loggerContext );
            errorFilter.setLevel( Level.ERROR );
            errorFilter.setOnMatch( FilterReply.ACCEPT );
            errorFilter.setOnMismatch( FilterReply.DENY );

            // Set up the trace and error appenders
            RollingFileAppender rollingFileAppenderTrace = new RollingFileAppender();
            rollingFileAppenderTrace.setContext(loggerContext);
            rollingFileAppenderTrace.setName(name + "-Trace");
            rollingFileAppenderTrace.setFile(name + "-Trace.log");
            rollingFileAppenderTrace.setEncoder(encoder);
            rollingFileAppenderTrace.setRollingPolicy( tracePolicy );
            rollingFileAppenderTrace.addFilter( traceFilter );
            tracePolicy.setParent( rollingFileAppenderTrace );

            RollingFileAppender rollingFileAppenderError = new RollingFileAppender();
            rollingFileAppenderError.setContext(loggerContext);
            rollingFileAppenderError.setName(name + "-Error");
            rollingFileAppenderError.setFile(name + "-Error.log");
            rollingFileAppenderError.setEncoder(encoder);
            rollingFileAppenderError.setRollingPolicy( errorPolicy );
            rollingFileAppenderError.addFilter( errorFilter );
            errorPolicy.setParent( rollingFileAppenderError );

            // Start everything
            tracePolicy.start();
            errorPolicy.start();
            traceFilter.start();
            errorFilter.start();
            rollingFileAppenderTrace.start();
            rollingFileAppenderError.start();

            // attach the rolling file appenders to the logger
            Logger logger = (ch.qos.logback.classic.Logger) loggerContext.getLogger(name);
            logger.addAppender(rollingFileAppenderTrace);
            logger.addAppender(rollingFileAppenderError);

        }

        StatusPrinter.print(loggerContext);

        // Test it to see what happens
        for(int i = 0; i < nameList.length; i++) {

            String name = nameList[i];

            Logger logger = (ch.qos.logback.classic.Logger) LoggerFactory.getLogger(name);
            logger.error("error message" );
            logger.warn("warn message" );
            logger.info("info message" );
            logger.debug("debug message" );
            logger.trace("trace message" );
        }

        Logger logger = (ch.qos.logback.classic.Logger) LoggerFactory.getLogger("com.myapp");
        logger.error( "generic error message ");


    }

}

这是 logback.xml 文件:

    <appender name="STDOUT" class="ch.qos.logback.core.ConsoleAppender">
        <encoder>
            <pattern>%d{HH:mm:ss.SSS} [%thread] %-5level %logger{36} - %msg%n</pattern>
        </encoder>
    </appender>

    <appender name="FILE" class="ch.qos.logback.core.rolling.RollingFileAppender">
        <file>logFile.log</file>
        <rollingPolicy class="ch.qos.logback.core.rolling.TimeBasedRollingPolicy">
            <fileNamePattern>logFile.%d{yyyy-MM-dd}.log</fileNamePattern>
            <maxHistory>30</maxHistory>
        </rollingPolicy>
        <encoder>
            <pattern>%-4relative [%thread] %-5level %logger{35} - %msg%n</pattern>
        </encoder>
    </appender>

    <root level="debug">
        <appender-ref ref="STDOUT" />
        <appender-ref ref="FILE" />
    </root>

</configuration>

如果您运行此代码，它将正确地将所有内容记录到主日志文件中。它将按预期创建 2 个跟踪和 2 个错误日志。但是所有跟踪消息都不会出现在跟踪日志文件中，并且两条错误消息都将出现在 class2 错误文件中。它的行为就像所有 4 个 appender 都被添加到同一个记录器并且只有最后一个被添加的 appender 才真正起作用。我很想知道我在这里做什么。谢谢!

Answer 1

everything into the main log file

这是因为所有记录器都将从 ROOT 记录器“继承”附加程序，您可以使用 logger.setAdditive(false) 来禁用此行为。

但是我不知道你为什么没有任何trace log...

也许这两个链接会给你一些启发

Logback - set log file name programmatically

how-to-create-logback-loggers-dynamically-pragmatically