org.eclipse.jetty.io.nio.DirectNIOBuffer Maven / Gradle / Ivy
// ========================================================================
// Copyright (c) 2004-2009 Mort Bay Consulting Pty. Ltd.
// ------------------------------------------------------------------------
// All rights reserved. This program and the accompanying materials
// are made available under the terms of the Eclipse Public License v1.0
// and Apache License v2.0 which accompanies this distribution.
// The Eclipse Public License is available at
// http://www.eclipse.org/legal/epl-v10.html
// The Apache License v2.0 is available at
// http://www.opensource.org/licenses/apache2.0.php
// You may elect to redistribute this code under either of these licenses.
// ========================================================================
package org.eclipse.jetty.io.nio;
import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.nio.ByteBuffer;
import java.nio.channels.Channels;
import java.nio.channels.FileChannel;
import java.nio.channels.ReadableByteChannel;
import java.nio.channels.WritableByteChannel;
import org.eclipse.jetty.io.AbstractBuffer;
import org.eclipse.jetty.io.Buffer;
/* ------------------------------------------------------------------------------- */
/**
*
*
*/
public class DirectNIOBuffer extends AbstractBuffer implements NIOBuffer
{
protected final ByteBuffer _buf;
private ReadableByteChannel _in;
private InputStream _inStream;
private WritableByteChannel _out;
private OutputStream _outStream;
public DirectNIOBuffer(int size)
{
super(READWRITE,NON_VOLATILE);
_buf = ByteBuffer.allocateDirect(size);
_buf.position(0);
_buf.limit(_buf.capacity());
}
public DirectNIOBuffer(ByteBuffer buffer,boolean immutable)
{
super(immutable?IMMUTABLE:READWRITE,NON_VOLATILE);
if (!buffer.isDirect())
throw new IllegalArgumentException();
_buf = buffer;
setGetIndex(buffer.position());
setPutIndex(buffer.limit());
}
/**
* @param file
*/
public DirectNIOBuffer(File file) throws IOException
{
super(READONLY,NON_VOLATILE);
FileInputStream fis = new FileInputStream(file);
FileChannel fc = fis.getChannel();
_buf = fc.map(FileChannel.MapMode.READ_ONLY, 0, file.length());
setGetIndex(0);
setPutIndex((int)file.length());
_access=IMMUTABLE;
}
/* ------------------------------------------------------------ */
public boolean isDirect()
{
return true;
}
/* ------------------------------------------------------------ */
public byte[] array()
{
return null;
}
/* ------------------------------------------------------------ */
public int capacity()
{
return _buf.capacity();
}
/* ------------------------------------------------------------ */
public byte peek(int position)
{
return _buf.get(position);
}
public int peek(int index, byte[] b, int offset, int length)
{
int l = length;
if (index+l > capacity())
{
l=capacity()-index;
if (l==0)
return -1;
}
if (l < 0)
return -1;
try
{
_buf.position(index);
_buf.get(b,offset,l);
}
finally
{
_buf.position(0);
}
return l;
}
public void poke(int index, byte b)
{
if (isReadOnly()) throw new IllegalStateException(__READONLY);
if (index < 0) throw new IllegalArgumentException("index<0: " + index + "<0");
if (index > capacity())
throw new IllegalArgumentException("index>capacity(): " + index + ">" + capacity());
_buf.put(index,b);
}
@Override
public int poke(int index, Buffer src)
{
if (isReadOnly()) throw new IllegalStateException(__READONLY);
byte[] array=src.array();
if (array!=null)
{
return poke(index,array,src.getIndex(),src.length());
}
else
{
Buffer src_buf=src.buffer();
if (src_buf instanceof DirectNIOBuffer)
{
ByteBuffer src_bytebuf = ((DirectNIOBuffer)src_buf)._buf;
if (src_bytebuf==_buf)
src_bytebuf=_buf.duplicate();
try
{
_buf.position(index);
int space = _buf.remaining();
int length=src.length();
if (length>space)
length=space;
src_bytebuf.position(src.getIndex());
src_bytebuf.limit(src.getIndex()+length);
_buf.put(src_bytebuf);
return length;
}
finally
{
_buf.position(0);
src_bytebuf.limit(src_bytebuf.capacity());
src_bytebuf.position(0);
}
}
else
return super.poke(index,src);
}
}
@Override
public int poke(int index, byte[] b, int offset, int length)
{
if (isReadOnly()) throw new IllegalStateException(__READONLY);
if (index < 0) throw new IllegalArgumentException("index<0: " + index + "<0");
if (index + length > capacity())
{
length=capacity()-index;
if (length<0)
throw new IllegalArgumentException("index>capacity(): " + index + ">" + capacity());
}
try
{
_buf.position(index);
int space=_buf.remaining();
if (length>space)
length=space;
if (length>0)
_buf.put(b,offset,length);
return length;
}
finally
{
_buf.position(0);
}
}
/* ------------------------------------------------------------ */
public ByteBuffer getByteBuffer()
{
return _buf;
}
/* ------------------------------------------------------------ */
@Override
public int readFrom(InputStream in, int max) throws IOException
{
if (_in==null || !_in.isOpen() || in!=_inStream)
{
_in=Channels.newChannel(in);
_inStream=in;
}
if (max<0 || max>space())
max=space();
int p = putIndex();
try
{
int len=0, total=0, available=max;
int loop=0;
while (total0)
{
p += len;
total += len;
available -= len;
setPutIndex(p);
loop=0;
}
else if (loop++>1)
break;
if (in.available()<=0)
break;
}
if (len<0 && total==0)
return -1;
return total;
}
catch(IOException e)
{
_in=null;
_inStream=in;
throw e;
}
finally
{
if (_in!=null && !_in.isOpen())
{
_in=null;
_inStream=in;
}
_buf.position(0);
_buf.limit(_buf.capacity());
}
}
/* ------------------------------------------------------------ */
@Override
public void writeTo(OutputStream out) throws IOException
{
if (_out==null || !_out.isOpen() || out!=_outStream)
{
_out=Channels.newChannel(out);
_outStream=out;
}
synchronized (_buf)
{
try
{
int loop=0;
while(hasContent() && _out.isOpen())
{
_buf.position(getIndex());
_buf.limit(putIndex());
int len=_out.write(_buf);
if (len<0)
break;
else if (len>0)
{
skip(len);
loop=0;
}
else if (loop++>1)
break;
}
}
catch(IOException e)
{
_out=null;
_outStream=null;
throw e;
}
finally
{
if (_out!=null && !_out.isOpen())
{
_out=null;
_outStream=null;
}
_buf.position(0);
_buf.limit(_buf.capacity());
}
}
}
}