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Diffstat (limited to 'vm/reference/gnu/java/nio/VMChannel.java')
| -rw-r--r-- | vm/reference/gnu/java/nio/VMChannel.java | 197 |
1 files changed, 197 insertions, 0 deletions
diff --git a/vm/reference/gnu/java/nio/VMChannel.java b/vm/reference/gnu/java/nio/VMChannel.java new file mode 100644 index 000000000..fdea8ff62 --- /dev/null +++ b/vm/reference/gnu/java/nio/VMChannel.java @@ -0,0 +1,197 @@ +/* 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(); + +} |