russell@unturf.com
0a580b313d
Authors: russell@unturf.com · brackishbert@gmail.com · foxhop.net · TimeHexOn.com Patches, unit tests, benchmarks, whitepaper, and outreach briefs. Public domain — no copyright claimed. Use freely.
262 lines
8.5 KiB
Java
262 lines
8.5 KiB
Java
/*
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* Copyright (c) 2000, 2024, Oracle and/or its affiliates. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation. Oracle designates this
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* particular file as subject to the "Classpath" exception as provided
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* by Oracle in the LICENSE file that accompanied this code.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*/
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package sun.nio.ch;
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import java.io.File;
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import java.io.FileDescriptor;
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import java.io.IOException;
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import java.nio.CharBuffer;
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import jdk.internal.access.JavaIOFileDescriptorAccess;
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import jdk.internal.access.SharedSecrets;
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class FileDispatcherImpl extends FileDispatcher {
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private static final int MAP_INVALID = -1;
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private static final int MAP_RO = 0;
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private static final int MAP_RW = 1;
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private static final int MAP_PV = 2;
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private static final long ALLOCATION_GRANULARITY;
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private static final int MAX_DIRECT_TRANSFER_SIZE;
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// set to true if fast file transmission (TransmitFile) is enabled
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private static final boolean FAST_FILE_TRANSFER;
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private static final JavaIOFileDescriptorAccess fdAccess =
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SharedSecrets.getJavaIOFileDescriptorAccess();
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FileDispatcherImpl() { }
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@Override
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boolean needsPositionLock() {
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return true;
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}
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int read(FileDescriptor fd, long address, int len)
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throws IOException
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{
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return read0(fd, address, len);
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}
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int pread(FileDescriptor fd, long address, int len, long position)
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throws IOException
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{
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return pread0(fd, address, len, position);
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}
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long readv(FileDescriptor fd, long address, int len) throws IOException {
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return readv0(fd, address, len);
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}
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int write(FileDescriptor fd, long address, int len) throws IOException {
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return write0(fd, address, len, fdAccess.getAppend(fd));
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}
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int pwrite(FileDescriptor fd, long address, int len, long position)
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throws IOException
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{
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return pwrite0(fd, address, len, position);
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}
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long writev(FileDescriptor fd, long address, int len) throws IOException {
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return writev0(fd, address, len, fdAccess.getAppend(fd));
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}
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long seek(FileDescriptor fd, long offset) throws IOException {
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return seek0(fd, offset);
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}
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int force(FileDescriptor fd, boolean metaData) throws IOException {
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return force0(fd, metaData);
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}
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int truncate(FileDescriptor fd, long size) throws IOException {
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return truncate0(fd, size);
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}
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long size(FileDescriptor fd) throws IOException {
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return size0(fd);
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}
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int available(FileDescriptor fd) throws IOException {
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return available0(fd);
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}
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boolean isOther(FileDescriptor fd) throws IOException {
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return isOther0(fd);
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}
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int lock(FileDescriptor fd, boolean blocking, long pos, long size,
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boolean shared) throws IOException
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{
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return lock0(fd, blocking, pos, size, shared);
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}
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void release(FileDescriptor fd, long pos, long size) throws IOException {
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release0(fd, pos, size);
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}
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void close(FileDescriptor fd) throws IOException {
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fdAccess.close(fd);
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}
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FileDescriptor duplicateForMapping(FileDescriptor fd) throws IOException {
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// on Windows we need to keep a handle to the file
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FileDescriptor result = new FileDescriptor();
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long handle = duplicateHandle(fdAccess.getHandle(fd));
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fdAccess.setHandle(result, handle);
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fdAccess.registerCleanup(result);
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return result;
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}
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boolean canTransferToDirectly(java.nio.channels.SelectableChannel sc) {
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return FAST_FILE_TRANSFER && sc.isBlocking();
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}
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boolean transferToDirectlyNeedsPositionLock() {
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return true;
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}
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boolean canTransferToFromOverlappedMap() {
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return true;
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}
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long allocationGranularity() {
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return ALLOCATION_GRANULARITY;
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}
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long map(FileDescriptor fd, int prot, long position, long length,
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boolean isSync)
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throws IOException
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{
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return map0(fd, prot, position, length, isSync);
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}
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int unmap(long address, long length) {
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return unmap0(address, length);
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}
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int maxDirectTransferSize() {
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return MAX_DIRECT_TRANSFER_SIZE;
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}
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long transferTo(FileDescriptor src, long position, long count,
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FileDescriptor dst, boolean append) {
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return transferTo0(src, position, count, dst, append);
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}
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long transferFrom(FileDescriptor src, FileDescriptor dst,
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long position, long count, boolean append) {
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return IOStatus.UNSUPPORTED;
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}
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int setDirectIO(FileDescriptor fd, String path) {
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int result = -1;
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String filePath = path.substring(0, path.lastIndexOf(File.separator));
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CharBuffer buffer = CharBuffer.allocate(filePath.length());
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buffer.put(filePath);
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try {
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result = setDirect0(fd, buffer);
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} catch (IOException e) {
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throw new UnsupportedOperationException
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("Error setting up DirectIO", e);
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}
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return result;
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}
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static boolean isFastFileTransferRequested() {
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String fileTransferProp =
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System.getProperty("jdk.nio.enableFastFileTransfer", "false");
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return fileTransferProp.isEmpty() ? true : Boolean.parseBoolean(fileTransferProp);
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}
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static {
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IOUtil.load();
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FAST_FILE_TRANSFER = isFastFileTransferRequested();
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ALLOCATION_GRANULARITY = allocationGranularity0();
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MAX_DIRECT_TRANSFER_SIZE = maxDirectTransferSize0();
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}
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//-- Native methods
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static native int read0(FileDescriptor fd, long address, int len)
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throws IOException;
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static native int pread0(FileDescriptor fd, long address, int len,
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long position) throws IOException;
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static native long readv0(FileDescriptor fd, long address, int len)
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throws IOException;
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static native int write0(FileDescriptor fd, long address, int len, boolean append)
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throws IOException;
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static native int pwrite0(FileDescriptor fd, long address, int len,
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long position) throws IOException;
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static native long writev0(FileDescriptor fd, long address, int len, boolean append)
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throws IOException;
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static native long seek0(FileDescriptor fd, long offset) throws IOException;
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static native int force0(FileDescriptor fd, boolean metaData)
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throws IOException;
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static native int truncate0(FileDescriptor fd, long size)
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throws IOException;
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static native long size0(FileDescriptor fd) throws IOException;
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static native int available0(FileDescriptor fd) throws IOException;
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static native boolean isOther0(FileDescriptor fd) throws IOException;
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static native int lock0(FileDescriptor fd, boolean blocking, long pos,
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long size, boolean shared) throws IOException;
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static native void release0(FileDescriptor fd, long pos, long size)
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throws IOException;
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static native void close0(FileDescriptor fd) throws IOException;
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static native long duplicateHandle(long fd) throws IOException;
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static native long allocationGranularity0();
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static native long map0(FileDescriptor fd, int prot, long position,
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long length, boolean isSync)
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throws IOException;
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static native int unmap0(long address, long length);
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static native int maxDirectTransferSize0();
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static native long transferTo0(FileDescriptor src, long position,
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long count, FileDescriptor dst,
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boolean append);
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static native int setDirect0(FileDescriptor fd, CharBuffer buffer) throws IOException;
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}
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