255 lines
8.9 KiB
Java
255 lines
8.9 KiB
Java
/*
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* Copyright (c) 1995, 2007, 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 java.net;
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import java.io.FileDescriptor;
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import java.io.FileOutputStream;
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import java.io.IOException;
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import java.nio.channels.FileChannel;
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import static ikvm.internal.Winsock.*;
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import static java.net.net_util_md.*;
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import sun.misc.IoTrace;
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/**
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* This stream extends FileOutputStream to implement a
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* SocketOutputStream. Note that this class should <b>NOT</b> be
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* public.
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*
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* @author Jonathan Payne
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* @author Arthur van Hoff
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*/
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class SocketOutputStream extends FileOutputStream
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{
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private AbstractPlainSocketImpl impl = null;
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private byte temp[] = new byte[1];
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private Socket socket = null;
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/**
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* Creates a new SocketOutputStream. Can only be called
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* by a Socket. This method needs to hang on to the owner Socket so
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* that the fd will not be closed.
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* @param impl the socket output stream inplemented
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*/
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SocketOutputStream(AbstractPlainSocketImpl impl) throws IOException {
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super(impl.getFileDescriptor());
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this.impl = impl;
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socket = impl.getSocket();
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}
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/**
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* Returns the unique {@link java.nio.channels.FileChannel FileChannel}
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* object associated with this file output stream. </p>
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*
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* The <code>getChannel</code> method of <code>SocketOutputStream</code>
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* returns <code>null</code> since it is a socket based stream.</p>
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*
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* @return the file channel associated with this file output stream
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*
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* @since 1.4
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* @spec JSR-51
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*/
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public final FileChannel getChannel() {
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return null;
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}
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/**
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* Writes to the socket.
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* @param fd the FileDescriptor
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* @param b the data to be written
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* @param off the start offset in the data
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* @param len the number of bytes that are written
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* @exception IOException If an I/O error has occurred.
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*/
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private void socketWrite0(FileDescriptor fdObj, byte[] data, int off, int len) throws IOException
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{
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// [IKVM] this method is a direct port of the native code in openjdk6-b18\jdk\src\windows\native\java\net\SocketOutputStream.c
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final int MAX_BUFFER_LEN = 2048;
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cli.System.Net.Sockets.Socket fd;
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int buflen = 65536; // MAX_HEAP_BUFFER_LEN
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int n;
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if (IS_NULL(fdObj)) {
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throw new SocketException("socket closed");
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} else {
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fd = fdObj.getSocket();
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}
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if (IS_NULL(data)) {
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throw new NullPointerException("data argument");
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}
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while(len > 0) {
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int loff = 0;
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int chunkLen = Math.min(buflen, len);
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int llen = chunkLen;
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int retry = 0;
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while(llen > 0) {
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n = send(fd, data, off + loff, llen, 0);
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if (n > 0) {
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llen -= n;
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loff += n;
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continue;
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}
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/*
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* Due to a bug in Windows Sockets (observed on NT and Windows
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* 2000) it may be necessary to retry the send. The issue is that
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* on blocking sockets send/WSASend is supposed to block if there
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* is insufficient buffer space available. If there are a large
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* number of threads blocked on write due to congestion then it's
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* possile to hit the NT/2000 bug whereby send returns WSAENOBUFS.
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* The workaround we use is to retry the send. If we have a
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* large buffer to send (>2k) then we retry with a maximum of
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* 2k buffer. If we hit the issue with <=2k buffer then we backoff
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* for 1 second and retry again. We repeat this up to a reasonable
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* limit before bailing out and throwing an exception. In load
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* conditions we've observed that the send will succeed after 2-3
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* attempts but this depends on network buffers associated with
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* other sockets draining.
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*/
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if (WSAGetLastError() == WSAENOBUFS) {
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if (llen > MAX_BUFFER_LEN) {
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buflen = MAX_BUFFER_LEN;
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chunkLen = MAX_BUFFER_LEN;
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llen = MAX_BUFFER_LEN;
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continue;
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}
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if (retry >= 30) {
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throw new SocketException("No buffer space available - exhausted attempts to queue buffer");
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}
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cli.System.Threading.Thread.Sleep(1000);
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retry++;
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continue;
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}
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/*
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* Send failed - can be caused by close or write error.
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*/
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if (WSAGetLastError() == WSAENOTSOCK) {
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throw new SocketException("Socket closed");
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} else {
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throw NET_ThrowCurrent("socket write error");
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}
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}
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len -= chunkLen;
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off += chunkLen;
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}
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}
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/**
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* Writes to the socket with appropriate locking of the
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* FileDescriptor.
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* @param b the data to be written
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* @param off the start offset in the data
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* @param len the number of bytes that are written
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* @exception IOException If an I/O error has occurred.
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*/
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private void socketWrite(byte b[], int off, int len) throws IOException {
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if (len <= 0 || off < 0 || off + len > b.length) {
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if (len == 0) {
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return;
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}
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throw new ArrayIndexOutOfBoundsException();
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}
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Object traceContext = IoTrace.socketWriteBegin();
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int bytesWritten = 0;
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FileDescriptor fd = impl.acquireFD();
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try {
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socketWrite0(fd, b, off, len);
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bytesWritten = len;
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} catch (SocketException se) {
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if (se instanceof sun.net.ConnectionResetException) {
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impl.setConnectionResetPending();
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se = new SocketException("Connection reset");
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}
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if (impl.isClosedOrPending()) {
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throw new SocketException("Socket closed");
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} else {
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throw se;
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}
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} finally {
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impl.releaseFD();
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IoTrace.socketWriteEnd(traceContext, impl.address, impl.port, bytesWritten);
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}
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}
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/**
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* Writes a byte to the socket.
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* @param b the data to be written
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* @exception IOException If an I/O error has occurred.
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*/
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public void write(int b) throws IOException {
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temp[0] = (byte)b;
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socketWrite(temp, 0, 1);
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}
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/**
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* Writes the contents of the buffer <i>b</i> to the socket.
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* @param b the data to be written
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* @exception SocketException If an I/O error has occurred.
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*/
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public void write(byte b[]) throws IOException {
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socketWrite(b, 0, b.length);
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}
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/**
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* Writes <i>length</i> bytes from buffer <i>b</i> starting at
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* offset <i>len</i>.
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* @param b the data to be written
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* @param off the start offset in the data
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* @param len the number of bytes that are written
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* @exception SocketException If an I/O error has occurred.
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*/
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public void write(byte b[], int off, int len) throws IOException {
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socketWrite(b, off, len);
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}
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/**
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* Closes the stream.
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*/
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private boolean closing = false;
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public void close() throws IOException {
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// Prevent recursion. See BugId 4484411
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if (closing)
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return;
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closing = true;
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if (socket != null) {
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if (!socket.isClosed())
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socket.close();
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} else
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impl.close();
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closing = false;
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}
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/**
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* Overrides finalize, the fd is closed by the Socket.
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*/
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protected void finalize() {}
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}
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