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doip audit tool developed by bdware

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/*
 *    Copyright (c) [2021] [Peking University]
 *    [BDWare DOIP SDK] is licensed under Mulan PSL v2.
 *    You can use this software according to the terms and conditions of the Mulan PSL v2.
 *    You may obtain a copy of Mulan PSL v2 at:
 *             http://license.coscl.org.cn/MulanPSL2
 *    THIS SOFTWARE IS PROVIDED ON AN "AS IS" BASIS, WITHOUT WARRANTIES OF ANY KIND, EITHER EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO NON-INFRINGEMENT, MERCHANTABILITY OR FIT FOR A PARTICULAR PURPOSE.
 *    See the Mulan PSL v2 for more details.
 */

package org.bdware.dogp;

import io.netty.channel.ChannelHandler;
import io.netty.channel.ChannelHandlerContext;
import io.netty.channel.SimpleChannelInboundHandler;
import org.apache.logging.log4j.LogManager;
import org.apache.logging.log4j.Logger;
import org.bdware.dogp.codec.DOGPMessage;

@ChannelHandler.Sharable
public class NettyDOGPAddressHandler extends SimpleChannelInboundHandler {
    static Logger logger = LogManager.getLogger(NettyDOGPAddressHandler.class);
    protected DOGPRequestHandler requestHandler;

    public NettyDOGPAddressHandler(DOGPRequestHandler handler) {
        this.requestHandler = handler;
    }

    @Override
    protected void channelRead0(ChannelHandlerContext ctx, DOGPMessage msg) {
        try {
            DOGPMessage response = requestHandler.onRequest(ctx, msg);
            sendResponse(ctx, msg, response);
        } catch (Exception e) {
            e.printStackTrace();
        }
    }

    @Override
    public void channelActive(ChannelHandlerContext ctx) {
    }

    private void sendResponse(ChannelHandlerContext ctx, DOGPMessage request, DOGPMessage response) {
        if (response == null) return;
        if (request != null && request.getSender() != null) {
            response.setSender(request.getSender());
        }
        // for (; !ctx.channel().isWritable(); ) {
        //   Thread.yield();
        // logger.info("network busy, yeild");
        //}
        ctx.writeAndFlush(response);
    }
}