// ========================================================================
// Copyright (c) 2006-2011 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.IOException;
import org.eclipse.jetty.http.HttpException;
import org.eclipse.jetty.http.HttpStatus;
import org.eclipse.jetty.io.AsyncEndPoint;
import org.eclipse.jetty.io.Connection;
import org.eclipse.jetty.io.EndPoint;
import org.eclipse.jetty.io.nio.AsyncConnection;
import org.eclipse.jetty.io.nio.SelectChannelEndPoint;
import org.eclipse.jetty.util.log.Log;
import org.eclipse.jetty.util.log.Logger;
/* ------------------------------------------------------------ */
/** Asychronous Server HTTP connection
*
*/
public class AsyncHttpConnection extends AbstractHttpConnection implements AsyncConnection
{
private final static int NO_PROGRESS_INFO = Integer.getInteger("org.mortbay.jetty.NO_PROGRESS_INFO",100);
private final static int NO_PROGRESS_CLOSE = Integer.getInteger("org.mortbay.jetty.NO_PROGRESS_CLOSE",200);
private static final Logger LOG = Log.getLogger(AsyncHttpConnection.class);
private int _total_no_progress;
private final AsyncEndPoint _asyncEndp;
private boolean _readInterested = true;
public AsyncHttpConnection(Connector connector, EndPoint endpoint, Server server)
{
super(connector,endpoint,server);
_asyncEndp=(AsyncEndPoint)endpoint;
}
@Override
public Connection handle() throws IOException
{
Connection connection = this;
boolean some_progress=false;
boolean progress=true;
try
{
setCurrentConnection(this);
// don't check for idle while dispatched (unless blocking IO is done).
_asyncEndp.setCheckForIdle(false);
// While progress and the connection has not changed
while (progress && connection==this)
{
progress=false;
try
{
// Handle resumed request
if (_request._async.isAsync())
{
if (_request._async.isDispatchable())
handleRequest();
}
// else Parse more input
else if (!_parser.isComplete() && _parser.parseAvailable())
progress=true;
// Generate more output
if (_generator.isCommitted() && !_generator.isComplete() && !_endp.isOutputShutdown())
if (_generator.flushBuffer()>0)
progress=true;
// Flush output
_endp.flush();
// Has any IO been done by the endpoint itself since last loop
if (_asyncEndp.hasProgressed())
progress=true;
}
catch (HttpException e)
{
if (LOG.isDebugEnabled())
{
LOG.debug("uri="+_uri);
LOG.debug("fields="+_requestFields);
LOG.debug(e);
}
progress=true;
_generator.sendError(e.getStatus(), e.getReason(), null, true);
}
finally
{
some_progress|=progress;
// Is this request/response round complete and are fully flushed?
boolean parserComplete = _parser.isComplete();
boolean generatorComplete = _generator.isComplete();
boolean complete = parserComplete && generatorComplete;
if (parserComplete)
{
if (generatorComplete)
{
// Reset the parser/generator
progress=true;
// look for a switched connection instance?
if (_response.getStatus()==HttpStatus.SWITCHING_PROTOCOLS_101)
{
Connection switched=(Connection)_request.getAttribute("org.eclipse.jetty.io.Connection");
if (switched!=null)
connection=switched;
}
reset();
// TODO Is this still required?
if (!_generator.isPersistent() && !_endp.isOutputShutdown())
{
LOG.warn("Safety net oshut!!! IF YOU SEE THIS, PLEASE RAISE BUGZILLA");
_endp.shutdownOutput();
}
}
else
{
// We have finished parsing, but not generating so
// we must not be interested in reading until we
// have finished generating and we reset the generator
_readInterested = false;
LOG.debug("Disabled read interest while writing response {}", _endp);
}
}
if (!complete && _request.getAsyncContinuation().isAsyncStarted())
{
// The request is suspended, so even though progress has been made,
// exit the while loop by setting progress to false
LOG.debug("suspended {}",this);
progress=false;
}
}
}
}
finally
{
setCurrentConnection(null);
// If we are not suspended
if (!_request.getAsyncContinuation().isAsyncStarted())
{
// return buffers
_parser.returnBuffers();
_generator.returnBuffers();
// reenable idle checking unless request is suspended
_asyncEndp.setCheckForIdle(true);
}
// Safety net to catch spinning
if (some_progress)
_total_no_progress=0;
else
{
_total_no_progress++;
if (NO_PROGRESS_INFO>0 && _total_no_progress%NO_PROGRESS_INFO==0 && (NO_PROGRESS_CLOSE<=0 || _total_no_progress< NO_PROGRESS_CLOSE))
LOG.info("EndPoint making no progress: "+_total_no_progress+" "+_endp+" "+this);
if (NO_PROGRESS_CLOSE>0 && _total_no_progress==NO_PROGRESS_CLOSE)
{
LOG.warn("Closing EndPoint making no progress: "+_total_no_progress+" "+_endp+" "+this);
if (_endp instanceof SelectChannelEndPoint)
((SelectChannelEndPoint)_endp).getChannel().close();
}
}
}
return connection;
}
public void onInputShutdown() throws IOException
{
// If we don't have a committed response and we are not suspended
if (_generator.isIdle() && !_request.getAsyncContinuation().isSuspended())
{
// then no more can happen, so close.
_endp.close();
}
// Make idle parser seek EOF
if (_parser.isIdle())
_parser.setPersistent(false);
}
@Override
public void reset()
{
_readInterested = true;
LOG.debug("Enabled read interest {}", _endp);
super.reset();
}
@Override
public boolean isSuspended()
{
return !_readInterested || super.isSuspended();
}
}