JDK 11 jdk.jfr.jmod is the JMOD file for JDK 11 JFR module.

JDK 11 JFR module compiled class files are stored in \fyicenter\jdk-11.0.1\jmods\jdk.jfr.jmod.

JDK 11 JFR module compiled class files are also linked and stored in the \fyicenter\jdk-11.0.1\lib\modules JImage file.

JDK 11 JFR module source code files are stored in \fyicenter\jdk-11.0.1\lib\src.zip\jdk.jfr.

You can click and view the content of each source code file in the list below.

⏎ jdk/jfr/internal/Logger.java

/*
 * Copyright (c) 2016, 2018, Oracle and/or its affiliates. All rights reserved.
 * ORACLE PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
 *
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package jdk.jfr.internal;

import java.util.function.Supplier;

/**
 * JFR logger
 *
 */

public final class Logger {

    private final static int MAX_SIZE = 10000;

    public static void log(LogTag logTag, LogLevel logLevel, String message) {
        if (logTag.shouldLog(logLevel.level)) {
            logInternal(logTag, logLevel, message);
        }
    }

    public static void log(LogTag logTag, LogLevel logLevel, Supplier<String> messageSupplier) {
        if (logTag.shouldLog(logLevel.level)) {
            logInternal(logTag, logLevel, messageSupplier.get());
        }
    }

    private static void logInternal(LogTag logTag, LogLevel logLevel, String message) {
        if (message == null || message.length() < MAX_SIZE) {
            JVM.log(logTag.id, logLevel.level, message);
        } else {
            JVM.log(logTag.id, logLevel.level, message.substring(0, MAX_SIZE));
        }
    }
}

⏎ jdk/jfr/internal/Logger.java

Or download all of them as a single archive file:

File name: jdk.jfr-11.0.1-src.zip
File size: 237632 bytes
Release date: 2018-11-04
Download 

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