| /* VMChannel.java -- Native interface suppling channel operations. |
| Copyright (C) 2006 Free Software Foundation, Inc. |
| |
| This file is part of GNU Classpath. |
| |
| GNU Classpath is free software; you can redistribute it and/or modify |
| it under the terms of the GNU General Public License as published by |
| the Free Software Foundation; either version 2, or (at your option) |
| any later version. |
| |
| GNU Classpath 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 for more details. |
| |
| You should have received a copy of the GNU General Public License |
| along with GNU Classpath; see the file COPYING. If not, write to the |
| Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA |
| 02110-1301 USA. |
| |
| Linking this library statically or dynamically with other modules is |
| making a combined work based on this library. Thus, the terms and |
| conditions of the GNU General Public License cover the whole |
| combination. |
| |
| As a special exception, the copyright holders of this library give you |
| permission to link this library with independent modules to produce an |
| executable, regardless of the license terms of these independent |
| modules, and to copy and distribute the resulting executable under |
| terms of your choice, provided that you also meet, for each linked |
| independent module, the terms and conditions of the license of that |
| module. An independent module is a module which is not derived from |
| or based on this library. If you modify this library, you may extend |
| this exception to your version of the library, but you are not |
| obligated to do so. If you do not wish to do so, delete this |
| exception statement from your version. */ |
| |
| |
| package gnu.java.nio; |
| |
| import gnu.classpath.Configuration; |
| import gnu.java.net.PlainSocketImpl; |
| import gnu.java.nio.PipeImpl.SinkChannelImpl; |
| import gnu.java.nio.PipeImpl.SourceChannelImpl; |
| import gnu.java.nio.channels.FileChannelImpl; |
| |
| import java.io.IOException; |
| import java.nio.ByteBuffer; |
| |
| /** |
| * Native interface to support configuring of channel to run in a non-blocking |
| * manner and support scatter/gather io operations. |
| * |
| * @author Michael Barker <mike@middlesoft.co.uk> |
| * |
| */ |
| public class VMChannel |
| { |
| private final int fd; |
| |
| private VMChannel(int fd) |
| { |
| this.fd = fd; |
| } |
| |
| public static VMChannel getVMChannel(PlainSocketImpl socket) |
| { |
| return new VMChannel(socket.getNativeFD()); |
| } |
| |
| public static VMChannel getVMChannel(SourceChannelImpl source) |
| { |
| return new VMChannel(source.getNativeFD()); |
| } |
| |
| public static VMChannel getVMChannel(SinkChannelImpl sink) |
| { |
| return new VMChannel(sink.getNativeFD()); |
| } |
| |
| public static VMChannel getVMChannel(FileChannelImpl file) |
| { |
| return new VMChannel(file.getNativeFD()); |
| } |
| |
| static |
| { |
| // load the shared library needed for native methods. |
| if (Configuration.INIT_LOAD_LIBRARY) |
| { |
| System.loadLibrary ("javanio"); |
| } |
| initIDs(); |
| } |
| |
| /** |
| * Set the file descriptor to have the required blocking |
| * setting. |
| * |
| * @param fd |
| * @param blocking |
| */ |
| public native void setBlocking(int fd, boolean blocking); |
| |
| public void setBlocking(boolean blocking) |
| { |
| setBlocking(fd, blocking); |
| } |
| |
| |
| /** |
| * Reads a byte buffer directly using the supplied file descriptor. |
| * Assumes that the buffer is a DirectBuffer. |
| * |
| * @param fd Native file descriptor to read from. |
| * @param dst Direct Byte Buffer to read to. |
| * @return Number of bytes read. |
| * @throws IOException If an error occurs or dst is not a direct buffers. |
| */ |
| native int read(int fd, ByteBuffer dst) |
| throws IOException; |
| |
| public int read(ByteBuffer dst) |
| throws IOException |
| { |
| return read(fd, dst); |
| } |
| |
| /** |
| * Reads into byte buffers directly using the supplied file descriptor. |
| * Assumes that the buffer list contains DirectBuffers. Will perform a |
| * scattering read. |
| * |
| * @param fd Native file descriptor to read from. |
| * @param dsts An array direct byte buffers. |
| * @param offset Index of the first buffer to read to. |
| * @param length The number of buffers to read to. |
| * @return Number of bytes read. |
| * @throws IOException If an error occurs or the dsts are not direct buffers. |
| */ |
| native long readScattering(int fd, ByteBuffer[] dsts, int offset, int length) |
| throws IOException; |
| |
| public long readScattering(ByteBuffer[] dsts, int offset, int length) |
| throws IOException |
| { |
| if (offset + length > dsts.length) |
| throw new IndexOutOfBoundsException("offset + length > dsts.length"); |
| |
| return readScattering(fd, dsts, offset, length); |
| } |
| |
| /** |
| * Writes from a direct byte bufer using the supplied file descriptor. |
| * Assumes the buffer is a DirectBuffer. |
| * |
| * @param fd |
| * @param src |
| * @return Number of bytes written. |
| * @throws IOException |
| */ |
| native int write(int fd, ByteBuffer src) |
| throws IOException; |
| |
| public int write(ByteBuffer src) |
| throws IOException |
| { |
| return write(fd, src); |
| } |
| |
| /** |
| * Writes from byte buffers directly using the supplied file descriptor. |
| * Assumes the that buffer list constains DirectBuffers. Will perform |
| * as gathering write. |
| * |
| * @param fd |
| * @param srcs |
| * @param offset |
| * @param length |
| * @return Number of bytes written. |
| * @throws IOException |
| */ |
| native long writeGathering(int fd, ByteBuffer[] srcs, int offset, int length) |
| throws IOException; |
| |
| public long writeGathering(ByteBuffer[] srcs, int offset, int length) |
| throws IOException |
| { |
| if (offset + length > srcs.length) |
| throw new IndexOutOfBoundsException("offset + length > srcs.length"); |
| |
| return writeGathering(fd, srcs, offset, length); |
| } |
| |
| private native static void initIDs(); |
| |
| } |