| package org.onlab.netty; |
| |
| import io.netty.buffer.ByteBuf; |
| import io.netty.channel.ChannelHandlerContext; |
| import io.netty.handler.codec.MessageToByteEncoder; |
| |
| /** |
| * Encode InternalMessage out into a byte buffer. |
| */ |
| public class MessageEncoder extends MessageToByteEncoder<InternalMessage> { |
| |
| // onosiscool in ascii |
| public static final byte[] PREAMBLE = "onosiscool".getBytes(); |
| |
| private final Serializer serializer; |
| |
| public MessageEncoder(Serializer serializer) { |
| this.serializer = serializer; |
| } |
| |
| @Override |
| protected void encode(ChannelHandlerContext context, InternalMessage message, |
| ByteBuf out) throws Exception { |
| |
| // write preamble |
| out.writeBytes(PREAMBLE); |
| |
| // write id |
| out.writeLong(message.id()); |
| |
| // write type length |
| out.writeInt(message.type().length()); |
| |
| // write type |
| out.writeBytes(message.type().getBytes()); |
| |
| // write sender host name size |
| out.writeInt(message.sender().host().length()); |
| |
| // write sender host name. |
| out.writeBytes(message.sender().host().getBytes()); |
| |
| // write port |
| out.writeInt(message.sender().port()); |
| |
| try { |
| serializer.encode(message.payload()); |
| } catch (Exception e) { |
| e.printStackTrace(); |
| } |
| |
| byte[] payload = serializer.encode(message.payload()); |
| |
| // write payload length. |
| out.writeInt(payload.length); |
| |
| // write payload bytes |
| out.writeBytes(payload); |
| } |
| } |