@Override protected void channelRead0(final ChannelHandlerContext ctx, final WebSocketFrame frame) throws Exception { if (frame instanceof CloseWebSocketFrame) { logger.debug("Received closeFrame"); ctx.close(); return; } if (frame instanceof TextWebSocketFrame) { logger.info("TextWebSocketFrame: " + ((TextWebSocketFrame)frame).text()); final JsonNode json = JsonMapper.asJsonNode(((TextWebSocketFrame) frame).text()); logger.info("json: " + json); switch (MessageType.from(json.get("msgType").asText())) { case PATCH: final PatchMessage<S> serverPatchMessage = syncEngine.patchMessageFromJson(json.toString()); logger.info("Edits: " + serverPatchMessage); patch(serverPatchMessage); break; case UNKNOWN: unknownMessageType(ctx, json); break; } } else { ctx.fireChannelRead(frame); } }