Madan Jampani | ab6d311 | 2014-10-02 16:30:14 -0700 | [diff] [blame] | 1 | package org.onlab.netty; |
| 2 | |
Madan Jampani | 86ed055 | 2014-10-03 16:45:42 -0700 | [diff] [blame^] | 3 | import static com.google.common.base.Preconditions.checkState; |
| 4 | import io.netty.buffer.ByteBuf; |
| 5 | import io.netty.channel.ChannelHandlerContext; |
| 6 | import io.netty.handler.codec.ReplayingDecoder; |
| 7 | |
Madan Jampani | ab6d311 | 2014-10-02 16:30:14 -0700 | [diff] [blame] | 8 | import java.util.Arrays; |
| 9 | import java.util.List; |
| 10 | |
Madan Jampani | 86ed055 | 2014-10-03 16:45:42 -0700 | [diff] [blame^] | 11 | // TODO: Implement performance enchancements such as those described in the javadoc for ReplayingDecoder. |
| 12 | public class MessageDecoder extends ReplayingDecoder<InternalMessage> { |
Madan Jampani | ab6d311 | 2014-10-02 16:30:14 -0700 | [diff] [blame] | 13 | |
| 14 | private final NettyMessagingService messagingService; |
| 15 | private final Serializer serializer; |
| 16 | |
| 17 | public MessageDecoder(NettyMessagingService messagingService, Serializer serializer) { |
| 18 | this.messagingService = messagingService; |
| 19 | this.serializer = serializer; |
| 20 | } |
| 21 | |
| 22 | @Override |
Madan Jampani | 86ed055 | 2014-10-03 16:45:42 -0700 | [diff] [blame^] | 23 | protected void decode( |
| 24 | ChannelHandlerContext context, |
| 25 | ByteBuf buffer, |
| 26 | List<Object> out) throws Exception { |
Madan Jampani | ab6d311 | 2014-10-02 16:30:14 -0700 | [diff] [blame] | 27 | |
Madan Jampani | 86ed055 | 2014-10-03 16:45:42 -0700 | [diff] [blame^] | 28 | byte[] preamble = new byte[MessageEncoder.PREAMBLE.length]; |
| 29 | buffer.readBytes(preamble); |
Madan Jampani | ab6d311 | 2014-10-02 16:30:14 -0700 | [diff] [blame] | 30 | checkState(Arrays.equals(MessageEncoder.PREAMBLE, preamble), "Message has wrong preamble"); |
| 31 | |
Madan Jampani | 86ed055 | 2014-10-03 16:45:42 -0700 | [diff] [blame^] | 32 | int bodySize = buffer.readInt(); |
| 33 | byte[] body = new byte[bodySize]; |
| 34 | buffer.readBytes(body); |
Madan Jampani | ab6d311 | 2014-10-02 16:30:14 -0700 | [diff] [blame] | 35 | |
Madan Jampani | 86ed055 | 2014-10-03 16:45:42 -0700 | [diff] [blame^] | 36 | InternalMessage message = serializer.decode(body); |
| 37 | message.setMessagingService(messagingService); |
| 38 | out.add(message); |
Madan Jampani | ab6d311 | 2014-10-02 16:30:14 -0700 | [diff] [blame] | 39 | } |
| 40 | } |