org.eclipse.jetty.server.HttpOutput Maven / Gradle / Ivy
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//
// ========================================================================
// Copyright (c) 1995-2012 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.server;
import java.io.EOFException;
import java.io.IOException;
import java.io.InputStream;
import java.nio.ByteBuffer;
import java.nio.channels.ReadableByteChannel;
import javax.servlet.RequestDispatcher;
import javax.servlet.ServletOutputStream;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;
import org.eclipse.jetty.http.HttpContent;
import org.eclipse.jetty.http.HttpHeader;
import org.eclipse.jetty.io.EofException;
import org.eclipse.jetty.util.BufferUtil;
import org.eclipse.jetty.util.log.Log;
import org.eclipse.jetty.util.log.Logger;
import org.eclipse.jetty.util.resource.Resource;
/**
* {@link HttpOutput} implements {@link ServletOutputStream}
* as required by the Servlet specification.
* {@link HttpOutput} buffers content written by the application until a
* further write will overflow the buffer, at which point it triggers a commit
* of the response.
* {@link HttpOutput} can be closed and reopened, to allow requests included
* via {@link RequestDispatcher#include(ServletRequest, ServletResponse)} to
* close the stream, to be reopened after the inclusion ends.
*/
public class HttpOutput extends ServletOutputStream
{
private static Logger LOG = Log.getLogger(HttpOutput.class);
private final HttpChannel _channel;
private boolean _closed;
private long _written;
private ByteBuffer _aggregate;
private int _bufferSize;
public HttpOutput(HttpChannel channel)
{
_channel = channel;
_bufferSize = _channel.getHttpConfiguration().getOutputBufferSize();
}
public boolean isWritten()
{
return _written > 0;
}
public long getWritten()
{
return _written;
}
public void reset()
{
_written = 0;
_closed = false;
}
public void reopen()
{
_closed = false;
}
/** Called by the HttpChannel if the output was closed
* externally (eg by a 500 exception handling).
*/
void closed()
{
_closed = true;
if (_aggregate != null)
{
_channel.getConnector().getByteBufferPool().release(_aggregate);
_aggregate = null;
}
}
@Override
public void close()
{
if (!_closed)
{
try
{
if (BufferUtil.hasContent(_aggregate))
_channel.write(_aggregate, !_channel.getResponse().isIncluding());
else
_channel.write(BufferUtil.EMPTY_BUFFER, !_channel.getResponse().isIncluding());
}
catch(IOException e)
{
_channel.getEndPoint().shutdownOutput();
LOG.ignore(e);
}
}
_closed = true;
if (_aggregate != null)
{
_channel.getConnector().getByteBufferPool().release(_aggregate);
_aggregate = null;
}
}
public boolean isClosed()
{
return _closed;
}
@Override
public void flush() throws IOException
{
if (_closed)
throw new EofException();
if (BufferUtil.hasContent(_aggregate))
_channel.write(_aggregate, false);
else
_channel.write(BufferUtil.EMPTY_BUFFER, false);
}
public boolean closeIfAllContentWritten() throws IOException
{
return _channel.getResponse().closeIfAllContentWritten(_written);
}
@Override
public void write(byte[] b, int off, int len) throws IOException
{
if (_closed)
throw new EOFException();
// Do we have an aggregate buffer already ?
if (_aggregate == null)
{
// What size should the aggregate be ?
int size = getBufferSize();
// If this write would fill more than half the aggregate, just write it directly
if (len > size / 2)
{
_channel.write(ByteBuffer.wrap(b, off, len), false);
_written += len;
return;
}
// Allocate an aggregate buffer
_aggregate = _channel.getByteBufferPool().acquire(size, false);
}
// Do we have space to aggregate ?
int space = BufferUtil.space(_aggregate);
if (len > space)
{
// No space so write the aggregate out if it is not empty
if (BufferUtil.hasContent(_aggregate))
{
_channel.write(_aggregate, false);
space = BufferUtil.space(_aggregate);
}
}
// Do we have space to aggregate now ?
if (len > space)
{
// No space so write the content directly
_channel.write(ByteBuffer.wrap(b, off, len), false);
_written += len;
return;
}
// Aggregate the content
BufferUtil.append(_aggregate, b, off, len);
_written += len;
// Check if all written or full
if (!closeIfAllContentWritten() && BufferUtil.isFull(_aggregate))
_channel.write(_aggregate, false);
}
@Override
public void write(int b) throws IOException
{
if (_closed)
throw new EOFException();
if (_aggregate == null)
_aggregate = _channel.getByteBufferPool().acquire(getBufferSize(), false);
BufferUtil.append(_aggregate, (byte)b);
_written++;
// Check if all written or full
if (!closeIfAllContentWritten() && BufferUtil.isFull(_aggregate))
_channel.write(_aggregate, false);
}
@Override
public void print(String s) throws IOException
{
if (isClosed())
throw new IOException("Closed");
write(s.getBytes(_channel.getResponse().getCharacterEncoding()));
}
public void sendContent(Object content) throws IOException
{
if (isClosed())
throw new IOException("Closed");
if (content instanceof HttpContent)
{
HttpContent httpContent = (HttpContent)content;
Response response = _channel.getResponse();
String contentType = httpContent.getContentType();
if (contentType != null && !response.getHttpFields().containsKey(HttpHeader.CONTENT_TYPE.asString()))
response.getHttpFields().put(HttpHeader.CONTENT_TYPE, contentType);
if (httpContent.getContentLength() > 0)
response.getHttpFields().putLongField(HttpHeader.CONTENT_LENGTH, httpContent.getContentLength());
String lm = httpContent.getLastModified();
if (lm != null)
response.getHttpFields().put(HttpHeader.LAST_MODIFIED, lm);
else if (httpContent.getResource() != null)
{
long lml = httpContent.getResource().lastModified();
if (lml != -1)
response.getHttpFields().putDateField(HttpHeader.LAST_MODIFIED, lml);
}
String etag=httpContent.getETag();
if (etag!=null)
response.getHttpFields().put(HttpHeader.ETAG,etag);
content = httpContent.getDirectBuffer();
if (content == null)
content = httpContent.getIndirectBuffer();
if (content == null)
content = httpContent.getReadableByteChannel();
if (content == null)
content = httpContent.getInputStream();
}
else if (content instanceof Resource)
{
Resource resource = (Resource)content;
_channel.getResponse().getHttpFields().putDateField(HttpHeader.LAST_MODIFIED, resource.lastModified());
content = resource.getInputStream();
}
// Process content.
if (content instanceof ByteBuffer)
{
_channel.write((ByteBuffer)content, true);
_closed=true;
}
else if (content instanceof ReadableByteChannel)
{
ReadableByteChannel channel = (ReadableByteChannel)content;
ByteBuffer buffer = _channel.getByteBufferPool().acquire(getBufferSize(), true);
try
{
while(channel.isOpen())
{
int pos = BufferUtil.flipToFill(buffer);
int len=channel.read(buffer);
if (len<0)
break;
BufferUtil.flipToFlush(buffer,pos);
_channel.write(buffer,false);
}
}
finally
{
close();
_channel.getByteBufferPool().release(buffer);
}
}
else if (content instanceof InputStream)
{
InputStream in = (InputStream)content;
ByteBuffer buffer = _channel.getByteBufferPool().acquire(getBufferSize(), false);
byte[] array = buffer.array();
int offset=buffer.arrayOffset();
int size=array.length-offset;
try
{
while(true)
{
int len=in.read(array,offset,size);
if (len<0)
break;
buffer.position(0);
buffer.limit(len);
_channel.write(buffer,false);
}
}
finally
{
close();
_channel.getByteBufferPool().release(buffer);
}
}
else
throw new IllegalArgumentException("unknown content type "+content.getClass());
}
public int getBufferSize()
{
return _bufferSize;
}
public void setBufferSize(int size)
{
this._bufferSize = size;
}
public void resetBuffer()
{
if (BufferUtil.hasContent(_aggregate))
BufferUtil.clear(_aggregate);
}
}