Umesh Krishnaswamy | 345ee99 | 2012-12-13 20:29:48 -0800 | [diff] [blame] | 1 | /** |
Ray Milkey | 269ffb9 | 2014-04-03 14:43:30 -0700 | [diff] [blame^] | 2 | * Copyright 2011, Big Switch Networks, Inc. |
| 3 | * Originally created by David Erickson, Stanford University |
| 4 | * |
| 5 | * Licensed under the Apache License, Version 2.0 (the "License"); you may |
| 6 | * not use this file except in compliance with the License. You may obtain |
| 7 | * a copy of the License at |
| 8 | * |
| 9 | * http://www.apache.org/licenses/LICENSE-2.0 |
| 10 | * |
| 11 | * Unless required by applicable law or agreed to in writing, software |
| 12 | * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT |
| 13 | * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the |
| 14 | * License for the specific language governing permissions and limitations |
| 15 | * under the License. |
| 16 | **/ |
Umesh Krishnaswamy | 345ee99 | 2012-12-13 20:29:48 -0800 | [diff] [blame] | 17 | |
| 18 | package net.floodlightcontroller.core.internal; |
| 19 | |
| 20 | import java.util.List; |
| 21 | |
| 22 | import org.jboss.netty.buffer.ChannelBuffer; |
| 23 | import org.jboss.netty.channel.Channel; |
| 24 | import org.jboss.netty.channel.ChannelHandlerContext; |
| 25 | import org.jboss.netty.handler.codec.frame.FrameDecoder; |
| 26 | import org.openflow.protocol.OFMessage; |
| 27 | import org.openflow.protocol.factory.BasicFactory; |
| 28 | import org.openflow.protocol.factory.OFMessageFactory; |
| 29 | |
| 30 | /** |
| 31 | * Decode an openflow message from a Channel, for use in a netty |
| 32 | * pipeline |
Ray Milkey | 269ffb9 | 2014-04-03 14:43:30 -0700 | [diff] [blame^] | 33 | * |
Umesh Krishnaswamy | 345ee99 | 2012-12-13 20:29:48 -0800 | [diff] [blame] | 34 | * @author readams |
| 35 | */ |
| 36 | public class OFMessageDecoder extends FrameDecoder { |
| 37 | |
| 38 | OFMessageFactory factory = new BasicFactory(); |
Ray Milkey | 269ffb9 | 2014-04-03 14:43:30 -0700 | [diff] [blame^] | 39 | |
Umesh Krishnaswamy | 345ee99 | 2012-12-13 20:29:48 -0800 | [diff] [blame] | 40 | @Override |
| 41 | protected Object decode(ChannelHandlerContext ctx, Channel channel, |
| 42 | ChannelBuffer buffer) throws Exception { |
| 43 | if (!channel.isConnected()) { |
| 44 | // In testing, I see decode being called AFTER decode last. |
| 45 | // This check avoids that from reading curroupted frames |
| 46 | return null; |
| 47 | } |
| 48 | |
| 49 | List<OFMessage> message = factory.parseMessage(buffer); |
| 50 | return message; |
| 51 | } |
| 52 | |
| 53 | @Override |
| 54 | protected Object decodeLast(ChannelHandlerContext ctx, Channel channel, |
Ray Milkey | 269ffb9 | 2014-04-03 14:43:30 -0700 | [diff] [blame^] | 55 | ChannelBuffer buffer) throws Exception { |
Umesh Krishnaswamy | 345ee99 | 2012-12-13 20:29:48 -0800 | [diff] [blame] | 56 | // This is not strictly needed atthis time. It is used to detect |
| 57 | // connection reset detection from netty (for debug) |
| 58 | return null; |
| 59 | } |
| 60 | |
| 61 | } |