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