/*
* Copyright (c) 2011,2013 Big Switch Networks, Inc.
*
* Licensed under the Eclipse Public License, Version 1.0 (the
* "License"); you may not use this file except in compliance with the
* License. You may obtain a copy of the License at
*
* http://www.eclipse.org/legal/epl-v10.html
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
* implied. See the License for the specific language governing
* permissions and limitations under the License.
*
* This file incorporates work covered by the following copyright and
* permission notice:
*
* Originally created by David Erickson, Stanford University
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the
* License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing,
* software distributed under the License is distributed on an "AS
* IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either
* express or implied. See the License for the specific language
* governing permissions and limitations under the License.
*/
package org.sdnplatform.core.internal;
import java.util.List;
import org.jboss.netty.buffer.ChannelBuffer;
import org.jboss.netty.channel.Channel;
import org.jboss.netty.channel.ChannelHandlerContext;
import org.jboss.netty.handler.codec.frame.FrameDecoder;
import org.openflow.protocol.OFMessage;
import org.openflow.protocol.factory.BasicFactory;
import org.openflow.protocol.factory.OFMessageFactory;
/**
* Decode an openflow message from a Channel, for use in a netty
* pipeline
* @author readams
*/
public class OFMessageDecoder extends FrameDecoder {
OFMessageFactory factory = new BasicFactory();
@Override
protected Object decode(ChannelHandlerContext ctx, Channel channel,
ChannelBuffer buffer) throws Exception {
if (!channel.isConnected()) {
// In testing, I see decode being called AFTER decode last.
// This check avoids that from reading curroupted frames
return null;
}
List<OFMessage> message = factory.parseMessage(buffer);
return message;
}
@Override
protected Object decodeLast(ChannelHandlerContext ctx, Channel channel,
ChannelBuffer buffer) throws Exception {
// This is not strictly needed atthis time. It is used to detect
// connection reset detection from netty (for debug)
return null;
}
}