private boolean handleWindowFrame(ByteBuf in) {
if (!in.isReadable(FRAME_WINDOW_HEADER_LENGTH)) {
return false;
}
// update window size
sessionHandler.windowSizeRead(in.readInt());
return true;
}
@Override
protected void decode(ChannelHandlerContext ctx, ByteBuf in, List<Object> out) throws Exception {
// mark the reader index to be able to start decoding from the same position if there is not
// enough data to finish the frame decoding
in.markReaderIndex();
boolean frameDecoded = false;
try {
if (!in.isReadable(FRAME_HEADER_LENGTH)) {
return;
}
int frameVersion = in.readUnsignedByte();
sessionHandler.versionRead(frameVersion);
int frameType = in.readUnsignedByte();
LOG.debug("Received a lumberjack frame of type {}", (char) frameType);
switch (frameType) {
case TYPE_JSON:
frameDecoded = handleJsonFrame(in, out);
break;
case TYPE_DATA:
frameDecoded = handleDataFrame(in, out);
break;
case TYPE_WINDOW:
frameDecoded = handleWindowFrame(in);
break;
case TYPE_COMPRESS:
frameDecoded = handleCompressedFrame(ctx, in, out);
break;
default:
throw new RuntimeException("Unsupported frame type=" + frameType);
}
} finally {
if (!frameDecoded) {
LOG.debug(
"Not enough data to decode a complete frame, retry when more data is available. Reader index was {}",
in.readerIndex());
in.resetReaderIndex();
}
}
}
