package com.manning.nettyinaction.chapter10; import io.netty.buffer.ByteBuf; import io.netty.channel.ChannelHandlerContext; import io.netty.handler.codec.ByteToMessageDecoder; import io.netty.handler.codec.TooLongFrameException; import java.util.List; /** * @author <a href="mailto:norman.maurer@googlemail.com">Norman Maurer</a> */ public class FrameChunkDecoder extends ByteToMessageDecoder { private final int maxFrameSize; public FrameChunkDecoder(int maxFrameSize) { this.maxFrameSize = maxFrameSize; } @Override protected void decode(ChannelHandlerContext ctx, ByteBuf in, List<Object> out) throws Exception { int readableBytes = in.readableBytes(); if (readableBytes > maxFrameSize) { // discard the bytes in.clear(); throw new TooLongFrameException(); } ByteBuf buf = in.readBytes(readableBytes); out.add(buf); } }