Thomas Vachuska | 24c849c | 2014-10-27 09:53:05 -0700 | [diff] [blame] | 1 | /* |
Thomas Vachuska | 4f1a60c | 2014-10-28 13:39:07 -0700 | [diff] [blame] | 2 | * Copyright 2014 Open Networking Laboratory |
Thomas Vachuska | 24c849c | 2014-10-27 09:53:05 -0700 | [diff] [blame] | 3 | * |
Thomas Vachuska | 4f1a60c | 2014-10-28 13:39:07 -0700 | [diff] [blame] | 4 | * Licensed under the Apache License, Version 2.0 (the "License"); |
| 5 | * you may not use this file except in compliance with the License. |
| 6 | * You may obtain a copy of the License at |
Thomas Vachuska | 24c849c | 2014-10-27 09:53:05 -0700 | [diff] [blame] | 7 | * |
Thomas Vachuska | 4f1a60c | 2014-10-28 13:39:07 -0700 | [diff] [blame] | 8 | * http://www.apache.org/licenses/LICENSE-2.0 |
| 9 | * |
| 10 | * Unless required by applicable law or agreed to in writing, software |
| 11 | * distributed under the License is distributed on an "AS IS" BASIS, |
| 12 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| 13 | * See the License for the specific language governing permissions and |
| 14 | * limitations under the License. |
Thomas Vachuska | 24c849c | 2014-10-27 09:53:05 -0700 | [diff] [blame] | 15 | */ |
Madan Jampani | ab6d311 | 2014-10-02 16:30:14 -0700 | [diff] [blame] | 16 | package org.onlab.netty; |
| 17 | |
Madan Jampani | 86ed055 | 2014-10-03 16:45:42 -0700 | [diff] [blame] | 18 | import static com.google.common.base.Preconditions.checkState; |
| 19 | import io.netty.buffer.ByteBuf; |
| 20 | import io.netty.channel.ChannelHandlerContext; |
| 21 | import io.netty.handler.codec.ReplayingDecoder; |
| 22 | |
Madan Jampani | ab6d311 | 2014-10-02 16:30:14 -0700 | [diff] [blame] | 23 | import java.util.Arrays; |
| 24 | import java.util.List; |
| 25 | |
Madan Jampani | 29e5dfd | 2014-10-07 17:26:25 -0700 | [diff] [blame] | 26 | import org.slf4j.Logger; |
| 27 | import org.slf4j.LoggerFactory; |
| 28 | |
Madan Jampani | 938aa43 | 2014-10-04 17:37:23 -0700 | [diff] [blame] | 29 | /** |
| 30 | * Decoder for inbound messages. |
| 31 | */ |
| 32 | public class MessageDecoder extends ReplayingDecoder<DecoderState> { |
Madan Jampani | ab6d311 | 2014-10-02 16:30:14 -0700 | [diff] [blame] | 33 | |
Madan Jampani | 29e5dfd | 2014-10-07 17:26:25 -0700 | [diff] [blame] | 34 | private final Logger log = LoggerFactory.getLogger(getClass()); |
| 35 | |
Madan Jampani | ab6d311 | 2014-10-02 16:30:14 -0700 | [diff] [blame] | 36 | private final NettyMessagingService messagingService; |
Madan Jampani | 53e44e6 | 2014-10-07 12:39:51 -0700 | [diff] [blame] | 37 | |
| 38 | private static final KryoSerializer SERIALIZER = new KryoSerializer(); |
Madan Jampani | ab6d311 | 2014-10-02 16:30:14 -0700 | [diff] [blame] | 39 | |
Madan Jampani | 938aa43 | 2014-10-04 17:37:23 -0700 | [diff] [blame] | 40 | private int contentLength; |
| 41 | |
Madan Jampani | 53e44e6 | 2014-10-07 12:39:51 -0700 | [diff] [blame] | 42 | public MessageDecoder(NettyMessagingService messagingService) { |
Madan Jampani | 938aa43 | 2014-10-04 17:37:23 -0700 | [diff] [blame] | 43 | super(DecoderState.READ_HEADER_VERSION); |
Madan Jampani | ab6d311 | 2014-10-02 16:30:14 -0700 | [diff] [blame] | 44 | this.messagingService = messagingService; |
Madan Jampani | ab6d311 | 2014-10-02 16:30:14 -0700 | [diff] [blame] | 45 | } |
| 46 | |
| 47 | @Override |
Madan Jampani | 86ed055 | 2014-10-03 16:45:42 -0700 | [diff] [blame] | 48 | protected void decode( |
| 49 | ChannelHandlerContext context, |
| 50 | ByteBuf buffer, |
| 51 | List<Object> out) throws Exception { |
Madan Jampani | ab6d311 | 2014-10-02 16:30:14 -0700 | [diff] [blame] | 52 | |
Yuta HIGUCHI | 5e8ceb4 | 2014-11-04 17:22:26 -0800 | [diff] [blame] | 53 | switch (state()) { |
Madan Jampani | 938aa43 | 2014-10-04 17:37:23 -0700 | [diff] [blame] | 54 | case READ_HEADER_VERSION: |
| 55 | int headerVersion = buffer.readInt(); |
| 56 | checkState(headerVersion == MessageEncoder.HEADER_VERSION, "Unexpected header version"); |
| 57 | checkpoint(DecoderState.READ_PREAMBLE); |
| 58 | case READ_PREAMBLE: |
| 59 | byte[] preamble = new byte[MessageEncoder.PREAMBLE.length]; |
| 60 | buffer.readBytes(preamble); |
| 61 | checkState(Arrays.equals(MessageEncoder.PREAMBLE, preamble), "Message has wrong preamble"); |
| 62 | checkpoint(DecoderState.READ_CONTENT_LENGTH); |
| 63 | case READ_CONTENT_LENGTH: |
| 64 | contentLength = buffer.readInt(); |
| 65 | checkpoint(DecoderState.READ_SERIALIZER_VERSION); |
| 66 | case READ_SERIALIZER_VERSION: |
| 67 | int serializerVersion = buffer.readInt(); |
| 68 | checkState(serializerVersion == MessageEncoder.SERIALIZER_VERSION, "Unexpected serializer version"); |
| 69 | checkpoint(DecoderState.READ_CONTENT); |
| 70 | case READ_CONTENT: |
Madan Jampani | 53e44e6 | 2014-10-07 12:39:51 -0700 | [diff] [blame] | 71 | InternalMessage message = SERIALIZER.decode(buffer.readBytes(contentLength).nioBuffer()); |
Madan Jampani | 938aa43 | 2014-10-04 17:37:23 -0700 | [diff] [blame] | 72 | message.setMessagingService(messagingService); |
| 73 | out.add(message); |
| 74 | checkpoint(DecoderState.READ_HEADER_VERSION); |
| 75 | break; |
| 76 | default: |
| 77 | checkState(false, "Must not be here"); |
| 78 | } |
Madan Jampani | ab6d311 | 2014-10-02 16:30:14 -0700 | [diff] [blame] | 79 | } |
Madan Jampani | 29e5dfd | 2014-10-07 17:26:25 -0700 | [diff] [blame] | 80 | |
| 81 | @Override |
| 82 | public void exceptionCaught(ChannelHandlerContext context, Throwable cause) { |
| 83 | log.error("Exception inside channel handling pipeline.", cause); |
| 84 | context.close(); |
| 85 | } |
Madan Jampani | ab6d311 | 2014-10-02 16:30:14 -0700 | [diff] [blame] | 86 | } |