JDK 17 jdk.jfr.jmod is the JMOD file for JDK 17 JFR module.

JDK 17 JFR module compiled class files are stored in \fyicenter\jdk-17.0.5\jmods\jdk.jfr.jmod.

JDK 17 JFR module compiled class files are also linked and stored in the \fyicenter\jdk-17.0.5\lib\modules JImage file.

JDK 17 JFR module source code files are stored in \fyicenter\jdk-17.0.5\lib\src.zip\jdk.jfr.

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

⏎ jdk/jfr/internal/consumer/StringParser.java

/*
 * Copyright (c) 2019, 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.consumer;

import java.io.IOException;
import java.nio.charset.Charset;

public final class StringParser extends Parser {

    public enum Encoding {
        NULL(0),
        EMPTY_STRING(1),
        CONSTANT_POOL(2),
        UT8_BYTE_ARRAY(3),
        CHAR_ARRAY(4),
        LATIN1_BYTE_ARRAY(5);

        private byte byteValue;

        private Encoding(int byteValue) {
            this.byteValue = (byte) byteValue;
        }

        public byte byteValue() {
            return byteValue;
        }

        public boolean is(byte value) {
            return value == byteValue;
        }

    }
    private static final Charset UTF8 = Charset.forName("UTF-8");
    private static final Charset LATIN1 = Charset.forName("ISO-8859-1");

    private static final class CharsetParser extends Parser {
        private final Charset charset;
        private int lastSize;
        private byte[] buffer = new byte[16];
        private String lastString;

        CharsetParser(Charset charset) {
            this.charset = charset;
        }

        @Override
        public Object parse(RecordingInput input) throws IOException {
            int size = input.readInt();
            input.require(size, "String size %d exceeds available data");
            ensureSize(size);
            if (lastSize == size) {
                boolean equalsLastString = true;
                for (int i = 0; i < size; i++) {
                    // TODO: No need to read byte per byte
                    byte b = input.readByte();
                    if (buffer[i] != b) {
                        equalsLastString = false;
                        buffer[i] = b;
                    }
                }
                if (equalsLastString) {
                    return lastString;
                }
            } else {
                for (int i = 0; i < size; i++) {
                    buffer[i] = input.readByte();
                }
            }
            lastString = new String(buffer, 0, size, charset);
            lastSize = size;
            return lastString;
        }

        @Override
        public void skip(RecordingInput input) throws IOException {
            int size = input.readInt();
            input.skipBytes(size);
        }

        private void ensureSize(int size) {
            if (buffer.length < size) {
                buffer = new byte[size];
            }
        }
    }

    private static final class CharArrayParser extends Parser {
        private char[] buffer = new char[16];
        private int lastSize = -1;
        private String lastString = null;

        @Override
        public Object parse(RecordingInput input) throws IOException {
            int size = input.readInt();
            input.require(size, "String size %d exceeds available data");
            ensureSize(size);
            if (lastSize == size) {
                boolean equalsLastString = true;
                for (int i = 0; i < size; i++) {
                    char c = input.readChar();
                    if (buffer[i] != c) {
                        equalsLastString = false;
                        buffer[i] = c;
                    }
                }
                if (equalsLastString) {
                    return lastString;
                }
            } else {
                for (int i = 0; i < size; i++) {
                    buffer[i] = input.readChar();
                }
            }
            lastString = new String(buffer, 0, size);
            lastSize = size;
            return lastString;
        }

        @Override
        public void skip(RecordingInput input) throws IOException {
            int size = input.readInt();
            for (int i = 0; i < size; i++) {
                input.readChar();
            }
        }

        private void ensureSize(int size) {
            if (buffer.length < size) {
                buffer = new char[size];
            }
        }
    }

    private final ConstantLookup stringLookup;
    private final CharArrayParser charArrayParser = new CharArrayParser();
    private final CharsetParser utf8parser = new CharsetParser(UTF8);
    private final CharsetParser latin1parser = new CharsetParser(LATIN1);
    private final boolean event;

    public StringParser(ConstantLookup stringLookup, boolean event) {
        this.stringLookup = stringLookup;
        this.event = event;
    }

    @Override
    public Object parse(RecordingInput input) throws IOException {
        byte encoding = input.readByte();
        if (Encoding.CONSTANT_POOL.is(encoding)) {
            long key = input.readLong();
            if (event) {
                return stringLookup.getCurrentResolved(key);
            } else {
                return stringLookup.getCurrent(key);
            }
        }
        if (Encoding.NULL.is(encoding)) {
            return null;
        }
        if (Encoding.EMPTY_STRING.is(encoding)) {
            return "";
        }
        if (Encoding.CHAR_ARRAY.is(encoding)) {
            return charArrayParser.parse(input);
        }
        if (Encoding.UT8_BYTE_ARRAY.is(encoding)) {
            return utf8parser.parse(input);
        }
        if (Encoding.LATIN1_BYTE_ARRAY.is(encoding)) {
            return latin1parser.parse(input);
        }
        throw new IOException("Unknown string encoding " + encoding);
    }

    @Override
    public void skip(RecordingInput input) throws IOException {
        byte encoding = input.readByte();
        if (Encoding.CONSTANT_POOL.is(encoding)) {
            input.readLong();
            return;
        }
        if (Encoding.EMPTY_STRING.is(encoding)) {
            return;
        }
        if (Encoding.NULL.is(encoding)) {
            return;
        }
        if (Encoding.CHAR_ARRAY.is(encoding)) {
            charArrayParser.skip(input);
            return;
        }
        if (Encoding.UT8_BYTE_ARRAY.is(encoding)) {
            utf8parser.skip(input);
            return;
        }
        if (Encoding.LATIN1_BYTE_ARRAY.is(encoding)) {
            latin1parser.skip(input);
            return;
        }
        throw new IOException("Unknown string encoding " + encoding);
    }
}

⏎ jdk/jfr/internal/consumer/StringParser.java

Or download all of them as a single archive file:

File name: jdk.jfr-17.0.5-src.zip
File size: 363343 bytes
Release date: 2022-09-13
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