/*
* Copyright (c) 2013 Pantheon Technologies s.r.o. and others. All rights reserved.
*
* This program and the accompanying materials are made available under the
* terms of the Eclipse Public License v1.0 which accompanies this distribution,
* and is available at http://www.eclipse.org/legal/epl-v10.html
*/
package org.opendaylight.openflowjava.protocol.impl.clients;
import io.netty.buffer.ByteBuf;
import io.netty.channel.ChannelHandlerContext;
import io.netty.handler.codec.ByteToMessageDecoder;
import java.util.List;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
/**
* Class for decoding incoming messages into message frames.
*
* @author michal.polkorab
*/
public class SimpleClientFramer extends ByteToMessageDecoder {
/** Length of OpenFlow 1.3 header */
public static final byte LENGTH_OF_HEADER = 8;
private static final byte LENGTH_INDEX_IN_HEADER = 2;
private static final Logger LOG = LoggerFactory.getLogger(SimpleClientFramer.class);
/**
* Constructor of class.
*/
public SimpleClientFramer() {
LOG.trace("Creating OFFrameDecoder");
}
@Override
public void exceptionCaught(ChannelHandlerContext ctx, Throwable cause) throws Exception {
LOG.warn("Unexpected exception from downstream.", cause);
ctx.close();
}
@Override
protected void decode(ChannelHandlerContext chc, ByteBuf bb, List<Object> list) throws Exception {
if (bb.readableBytes() < LENGTH_OF_HEADER) {
LOG.debug("skipping bb - too few data for header: {}", bb.readableBytes());
return;
}
int length = bb.getUnsignedShort(bb.readerIndex() + LENGTH_INDEX_IN_HEADER);
if (bb.readableBytes() < length) {
LOG.debug("skipping bb - too few data for msg: {} < {}", bb.readableBytes(), length);
return;
}
LOG.debug("OF Protocol message received, type:{}", bb.getByte(bb.readerIndex() + 1));
ByteBuf messageBuffer = bb.slice(bb.readerIndex(), length);
list.add(messageBuffer);
messageBuffer.retain();
bb.skipBytes(length);
}
}