JDK 17 jdk.incubator.foreign.jmod is the JMOD file for JDK 17 HTTP Server module.

JDK 17 Incubator Foreign module compiled class files are stored in \fyicenter\jdk-17.0.5\jmods\jdk.incubator.foreign.jmod.

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

JDK 17 Incubator Foreign module source code files are stored in \fyicenter\jdk-17.0.5\lib\src.zip\jdk.incubator.foreign.

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

⏎ jdk/internal/foreign/MappedMemorySegmentImpl.java

/*
 * Copyright (c) 2020, Oracle and/or its affiliates. All rights reserved.
 * ORACLE PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
 *
 *
 *
 *
 *
 *
 *
 *
 *
 *
 *
 *
 *
 *
 *
 *
 *
 *
 *
 *
 */

package jdk.internal.foreign;

import jdk.incubator.foreign.MemorySegment;
import jdk.internal.access.foreign.UnmapperProxy;
import jdk.internal.misc.ExtendedMapMode;
import jdk.internal.misc.ScopedMemoryAccess;
import sun.nio.ch.FileChannelImpl;

import java.io.IOException;
import java.nio.ByteBuffer;
import java.nio.channels.FileChannel;
import java.nio.file.FileSystem;
import java.nio.file.FileSystems;
import java.nio.file.OpenOption;
import java.nio.file.Path;
import java.nio.file.StandardOpenOption;
import java.util.Objects;

/**
 * Implementation for a mapped memory segments. A mapped memory segment is a native memory segment, which
 * additionally features an {@link UnmapperProxy} object. This object provides detailed information about the
 * memory mapped segment, such as the file descriptor associated with the mapping. This information is crucial
 * in order to correctly reconstruct a byte buffer object from the segment (see {@link #makeByteBuffer()}).
 */
public class MappedMemorySegmentImpl extends NativeMemorySegmentImpl {

    private final UnmapperProxy unmapper;

    static ScopedMemoryAccess SCOPED_MEMORY_ACCESS = ScopedMemoryAccess.getScopedMemoryAccess();

    MappedMemorySegmentImpl(long min, UnmapperProxy unmapper, long length, int mask, ResourceScopeImpl scope) {
        super(min, length, mask, scope);
        this.unmapper = unmapper;
    }

    @Override
    ByteBuffer makeByteBuffer() {
        return nioAccess.newMappedByteBuffer(unmapper, min, (int)length, null,
                scope == ResourceScopeImpl.GLOBAL ? null : this);
    }

    @Override
    MappedMemorySegmentImpl dup(long offset, long size, int mask, ResourceScopeImpl scope) {
        return new MappedMemorySegmentImpl(min + offset, unmapper, size, mask, scope);
    }

    // mapped segment methods


    @Override
    public MappedMemorySegmentImpl asSlice(long offset, long newSize) {
        return (MappedMemorySegmentImpl)super.asSlice(offset, newSize);
    }

    @Override
    public boolean isMapped() {
        return true;
    }

    // support for mapped segments

    public MemorySegment segment() {
        return MappedMemorySegmentImpl.this;
    }

    public void load() {
        SCOPED_MEMORY_ACCESS.load(scope, min, unmapper.isSync(), length);
    }

    public void unload() {
        SCOPED_MEMORY_ACCESS.unload(scope, min, unmapper.isSync(), length);
    }

    public boolean isLoaded() {
        return SCOPED_MEMORY_ACCESS.isLoaded(scope, min, unmapper.isSync(), length);
    }

    public void force() {
        SCOPED_MEMORY_ACCESS.force(scope, unmapper.fileDescriptor(), min, unmapper.isSync(), 0, length);
    }

    // factories

    public static MemorySegment makeMappedSegment(Path path, long bytesOffset, long bytesSize, FileChannel.MapMode mapMode, ResourceScopeImpl scope) throws IOException {
        Objects.requireNonNull(path);
        Objects.requireNonNull(mapMode);
        scope.checkValidStateSlow();
        if (bytesSize < 0) throw new IllegalArgumentException("Requested bytes size must be >= 0.");
        if (bytesOffset < 0) throw new IllegalArgumentException("Requested bytes offset must be >= 0.");
        FileSystem fs = path.getFileSystem();
        if (fs != FileSystems.getDefault() ||
                fs.getClass().getModule() != Object.class.getModule()) {
            throw new IllegalArgumentException("Unsupported file system");
        }
        try (FileChannel channelImpl = FileChannel.open(path, openOptions(mapMode))) {
            UnmapperProxy unmapperProxy = ((FileChannelImpl)channelImpl).mapInternal(mapMode, bytesOffset, bytesSize);
            int modes = defaultAccessModes(bytesSize);
            if (mapMode == FileChannel.MapMode.READ_ONLY) {
                modes |= READ_ONLY;
            }
            if (unmapperProxy != null) {
                AbstractMemorySegmentImpl segment = new MappedMemorySegmentImpl(unmapperProxy.address(), unmapperProxy, bytesSize,
                        modes, scope);
                scope.addOrCleanupIfFail(new ResourceScopeImpl.ResourceList.ResourceCleanup() {
                    @Override
                    public void cleanup() {
                        unmapperProxy.unmap();
                    }
                });
                return segment;
            } else {
                return new EmptyMappedMemorySegmentImpl(modes, scope);
            }
        }
    }

    private static OpenOption[] openOptions(FileChannel.MapMode mapMode) {
        if (mapMode == FileChannel.MapMode.READ_ONLY ||
            mapMode == ExtendedMapMode.READ_ONLY_SYNC) {
            return new OpenOption[] { StandardOpenOption.READ };
        } else if (mapMode == FileChannel.MapMode.READ_WRITE ||
                   mapMode == FileChannel.MapMode.PRIVATE ||
                   mapMode == ExtendedMapMode.READ_WRITE_SYNC) {
            return new OpenOption[] { StandardOpenOption.READ, StandardOpenOption.WRITE };
        } else {
            throw new UnsupportedOperationException("Unsupported map mode: " + mapMode);
        }
    }

    static class EmptyMappedMemorySegmentImpl extends MappedMemorySegmentImpl {

        public EmptyMappedMemorySegmentImpl(int modes, ResourceScopeImpl scope) {
            super(0, null, 0, modes, scope);
        }

        @Override
        public void load() {
            // do nothing
        }

        @Override
        public void unload() {
            // do nothing
        }

        @Override
        public boolean isLoaded() {
            return true;
        }

        @Override
        public void force() {
            // do nothing
        }
    };
}

⏎ jdk/internal/foreign/MappedMemorySegmentImpl.java

Or download all of them as a single archive file:

File name: jdk.incubator.foreign-17.0.5-src.zip
File size: 168767 bytes
Release date: 2022-09-13
Download 

⇒ JDK 17 jdk.incubator.vector.jmod - JDK Incubator Vector

⇐ JDK 17 jdk.httpserver.jmod - HTTP Server Module

⇑ JDK 17 JMod/Module Files

⇑⇑ FAQ for JDK (Java Development Kit) 17