| /* |
| * Copyright (c) 2000, 2013, Oracle and/or its affiliates. All rights reserved. |
| * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| * |
| * This code is free software; you can redistribute it and/or modify it |
| * under the terms of the GNU General Public License version 2 only, as |
| * published by the Free Software Foundation. Oracle designates this |
| * particular file as subject to the "Classpath" exception as provided |
| * by Oracle in the LICENSE file that accompanied this code. |
| * |
| * This code is distributed in the hope that it will be useful, but WITHOUT |
| * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
| * version 2 for more details (a copy is included in the LICENSE file that |
| * accompanied this code). |
| * |
| * You should have received a copy of the GNU General Public License version |
| * 2 along with this work; if not, write to the Free Software Foundation, |
| * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
| * |
| * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
| * or visit www.oracle.com if you need additional information or have any |
| * questions. |
| */ |
| |
| package sun.nio.ch; |
| |
| import java.io.FileDescriptor; |
| import java.io.IOException; |
| import jdk.internal.misc.SharedSecrets; |
| import jdk.internal.misc.JavaIOFileDescriptorAccess; |
| import sun.security.action.GetPropertyAction; |
| |
| class FileDispatcherImpl extends FileDispatcher { |
| |
| private static final JavaIOFileDescriptorAccess fdAccess = |
| SharedSecrets.getJavaIOFileDescriptorAccess(); |
| |
| // set to true if fast file transmission (TransmitFile) is enabled |
| private static final boolean fastFileTransfer; |
| |
| FileDispatcherImpl() { } |
| |
| @Override |
| boolean needsPositionLock() { |
| return true; |
| } |
| |
| int read(FileDescriptor fd, long address, int len) |
| throws IOException |
| { |
| return read0(fd, address, len); |
| } |
| |
| int pread(FileDescriptor fd, long address, int len, long position) |
| throws IOException |
| { |
| return pread0(fd, address, len, position); |
| } |
| |
| long readv(FileDescriptor fd, long address, int len) throws IOException { |
| return readv0(fd, address, len); |
| } |
| |
| int write(FileDescriptor fd, long address, int len) throws IOException { |
| return write0(fd, address, len, fdAccess.getAppend(fd)); |
| } |
| |
| int pwrite(FileDescriptor fd, long address, int len, long position) |
| throws IOException |
| { |
| return pwrite0(fd, address, len, position); |
| } |
| |
| long writev(FileDescriptor fd, long address, int len) throws IOException { |
| return writev0(fd, address, len, fdAccess.getAppend(fd)); |
| } |
| |
| int force(FileDescriptor fd, boolean metaData) throws IOException { |
| return force0(fd, metaData); |
| } |
| |
| int truncate(FileDescriptor fd, long size) throws IOException { |
| return truncate0(fd, size); |
| } |
| |
| long size(FileDescriptor fd) throws IOException { |
| return size0(fd); |
| } |
| |
| int lock(FileDescriptor fd, boolean blocking, long pos, long size, |
| boolean shared) throws IOException |
| { |
| return lock0(fd, blocking, pos, size, shared); |
| } |
| |
| void release(FileDescriptor fd, long pos, long size) throws IOException { |
| release0(fd, pos, size); |
| } |
| |
| void close(FileDescriptor fd) throws IOException { |
| close0(fd); |
| } |
| |
| FileDescriptor duplicateForMapping(FileDescriptor fd) throws IOException { |
| // on Windows we need to keep a handle to the file |
| FileDescriptor result = new FileDescriptor(); |
| long handle = duplicateHandle(fdAccess.getHandle(fd)); |
| fdAccess.setHandle(result, handle); |
| return result; |
| } |
| |
| boolean canTransferToDirectly(java.nio.channels.SelectableChannel sc) { |
| return fastFileTransfer && sc.isBlocking(); |
| } |
| |
| boolean transferToDirectlyNeedsPositionLock() { |
| return true; |
| } |
| |
| static boolean isFastFileTransferRequested() { |
| String fileTransferProp = GetPropertyAction |
| .getProperty("jdk.nio.enableFastFileTransfer"); |
| boolean enable; |
| if ("".equals(fileTransferProp)) { |
| enable = true; |
| } else { |
| enable = Boolean.parseBoolean(fileTransferProp); |
| } |
| return enable; |
| } |
| |
| static { |
| IOUtil.load(); |
| fastFileTransfer = isFastFileTransferRequested(); |
| } |
| |
| //-- Native methods |
| |
| static native int read0(FileDescriptor fd, long address, int len) |
| throws IOException; |
| |
| static native int pread0(FileDescriptor fd, long address, int len, |
| long position) throws IOException; |
| |
| static native long readv0(FileDescriptor fd, long address, int len) |
| throws IOException; |
| |
| static native int write0(FileDescriptor fd, long address, int len, boolean append) |
| throws IOException; |
| |
| static native int pwrite0(FileDescriptor fd, long address, int len, |
| long position) throws IOException; |
| |
| static native long writev0(FileDescriptor fd, long address, int len, boolean append) |
| throws IOException; |
| |
| static native int force0(FileDescriptor fd, boolean metaData) |
| throws IOException; |
| |
| static native int truncate0(FileDescriptor fd, long size) |
| throws IOException; |
| |
| static native long size0(FileDescriptor fd) throws IOException; |
| |
| static native int lock0(FileDescriptor fd, boolean blocking, long pos, |
| long size, boolean shared) throws IOException; |
| |
| static native void release0(FileDescriptor fd, long pos, long size) |
| throws IOException; |
| |
| static native void close0(FileDescriptor fd) throws IOException; |
| |
| static native void closeByHandle(long fd) throws IOException; |
| |
| static native long duplicateHandle(long fd) throws IOException; |
| } |