ODL messageHandler

package org.opendaylight.ovsdb.internal;

import com.fasterxml.jackson.core.JsonParser;
import com.fasterxml.jackson.databind.JsonNode;
import com.fasterxml.jackson.databind.ObjectMapper;
import org.opendaylight.ovsdb.table.*;

import io.netty.channel.*;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;


import java.io.IOException;

public class MessageHandler extends SimpleChannelInboundHandler<String> {
    protected static final Logger logger = LoggerFactory
            .getLogger(ConnectionService.class);

    private Object response;

    public Object getResponse(){
        return this.response;
    }

    @Override
    public void channelRead0(ChannelHandlerContext ctx, String msg){

        JsonNode jsonNode;
        ObjectMapper mapper = new ObjectMapper();

        try{
            jsonNode = mapper.readTree(msg);
        }catch(IOException e){
            e.printStackTrace();
            return;
        }

        if(jsonNode.has("method")){
            String method = jsonNode.get("method").toString();
            if(method.contains("echo")){
                EchoReply echoreply = new EchoReply();
                JsonNode echoReplyJnode = mapper.valueToTree(echoreply);
                System.out.println(echoReplyJnode.toString());
                ctx.writeAndFlush(echoReplyJnode.toString());
            }
        }
        else if(jsonNode.has("result")){
            Long requestId = jsonNode.get("id").asLong();
            JsonParser parser = mapper.treeAsTokens(jsonNode.get("result"));
            try{
                this.response = mapper.readValue(parser, MessageIDMapper.getMapper().pop(requestId));
                System.out.println(this.response.toString());

            }catch(Exception e){
                e.printStackTrace();
            }
        }


    }
    @Override
    public void channelReadComplete(ChannelHandlerContext ctx) throws Exception{
        ctx.flush();
    }
}