org.eclipse.jetty.spdy.parser.Parser Maven / Gradle / Ivy
//
// ========================================================================
// Copyright (c) 1995-2013 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.spdy.parser;
import java.nio.ByteBuffer;
import java.util.EventListener;
import java.util.List;
import java.util.concurrent.CopyOnWriteArrayList;
import org.eclipse.jetty.spdy.CompressionFactory;
import org.eclipse.jetty.spdy.SessionException;
import org.eclipse.jetty.spdy.StreamException;
import org.eclipse.jetty.spdy.api.SessionStatus;
import org.eclipse.jetty.spdy.frames.ControlFrame;
import org.eclipse.jetty.spdy.frames.DataFrame;
import org.eclipse.jetty.util.log.Log;
import org.eclipse.jetty.util.log.Logger;
public class Parser
{
private static final Logger logger = Log.getLogger(Parser.class);
private final List listeners = new CopyOnWriteArrayList<>();
private final ControlFrameParser controlFrameParser;
private final DataFrameParser dataFrameParser;
private State state = State.CONTROL_BIT;
public Parser(CompressionFactory.Decompressor decompressor)
{
// It is important to allocate one decompression context per
// SPDY session for the control frames (to decompress the headers)
controlFrameParser = new ControlFrameParser(decompressor)
{
@Override
protected void onControlFrame(ControlFrame frame)
{
logger.debug("Parsed {}", frame);
notifyControlFrame(frame);
}
};
dataFrameParser = new DataFrameParser()
{
@Override
protected void onDataFrame(DataFrame frame, ByteBuffer data)
{
logger.debug("Parsed {}, {} data bytes", frame, data.remaining());
notifyDataFrame(frame, data);
}
};
}
public void addListener(Listener listener)
{
listeners.add(listener);
}
public void removeListener(Listener listener)
{
listeners.remove(listener);
}
protected void notifyControlFrame(ControlFrame frame)
{
for (Listener listener : listeners)
{
try
{
listener.onControlFrame(frame);
}
catch (Exception x)
{
logger.info("Exception while notifying listener " + listener, x);
}
}
}
protected void notifyDataFrame(DataFrame frame, ByteBuffer data)
{
for (Listener listener : listeners)
{
try
{
listener.onDataFrame(frame, data);
}
catch (Exception x)
{
logger.info("Exception while notifying listener " + listener, x);
}
}
}
protected void notifyStreamException(StreamException x)
{
for (Listener listener : listeners)
{
listener.onStreamException(x);
}
}
protected void notifySessionException(SessionException x)
{
logger.debug("SPDY session exception", x);
for (Listener listener : listeners)
{
try
{
listener.onSessionException(x);
}
catch (Exception xx)
{
logger.debug("Could not notify listener " + listener, xx);
}
}
}
public void parse(ByteBuffer buffer)
{
try
{
logger.debug("Parsing {} bytes", buffer.remaining());
while (buffer.hasRemaining())
{
switch (state)
{
case CONTROL_BIT:
{
// We must only peek the first byte and not advance the buffer
// because the 7 least significant bits may be relevant in data frames
int currByte = buffer.get(buffer.position());
boolean isControlFrame = (currByte & 0x80) == 0x80;
state = isControlFrame ? State.CONTROL_FRAME : State.DATA_FRAME;
break;
}
case CONTROL_FRAME:
{
if (controlFrameParser.parse(buffer))
reset();
break;
}
case DATA_FRAME:
{
if (dataFrameParser.parse(buffer))
reset();
break;
}
default:
{
throw new IllegalStateException();
}
}
}
}
catch (SessionException x)
{
notifySessionException(x);
}
catch (StreamException x)
{
notifyStreamException(x);
}
catch (Throwable x)
{
notifySessionException(new SessionException(SessionStatus.PROTOCOL_ERROR, x));
}
finally
{
// Be sure to consume after exceptions
buffer.position(buffer.limit());
}
}
private void reset()
{
state = State.CONTROL_BIT;
}
public interface Listener extends EventListener
{
public void onControlFrame(ControlFrame frame);
public void onDataFrame(DataFrame frame, ByteBuffer data);
public void onStreamException(StreamException x);
public void onSessionException(SessionException x);
public static class Adapter implements Listener
{
@Override
public void onControlFrame(ControlFrame frame)
{
}
@Override
public void onDataFrame(DataFrame frame, ByteBuffer data)
{
}
@Override
public void onStreamException(StreamException x)
{
}
@Override
public void onSessionException(SessionException x)
{
}
}
}
private enum State
{
CONTROL_BIT, CONTROL_FRAME, DATA_FRAME
}
}