labs/cluster-management/native-agent/src/main/java/com/alibaba/arthas/nat/agent/server/forward/RelayHandler.java [18:55]:
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public final class RelayHandler extends ChannelInboundHandlerAdapter {
    private final static Logger logger = LoggerFactory.getLogger(RelayHandler.class);
    private final Channel relayChannel;

    public RelayHandler(Channel relayChannel) {
        this.relayChannel = relayChannel;
    }

    @Override
    public void channelActive(ChannelHandlerContext ctx) {
        ctx.writeAndFlush(Unpooled.EMPTY_BUFFER);
    }

    @Override
    public void channelRead(ChannelHandlerContext ctx, Object msg) {
        if (relayChannel.isActive()) {
            relayChannel.writeAndFlush(msg);
        } else {
            ReferenceCountUtil.release(msg);
        }
    }

    @Override
    public void channelInactive(ChannelHandlerContext ctx) {
        if (relayChannel.isActive()) {
            ChannelUtils.closeOnFlush(relayChannel);
        }
    }

    @Override
    public void exceptionCaught(ChannelHandlerContext ctx, Throwable cause) {
        logger.error("RelayHandler error", cause);
        try {
            if (relayChannel.isActive()) {
                relayChannel.close();
            }
        } finally {
            ctx.close();
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tunnel-client/src/main/java/com/alibaba/arthas/tunnel/client/RelayHandler.java [12:49]:
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public final class RelayHandler extends ChannelInboundHandlerAdapter {
    private final static Logger logger = LoggerFactory.getLogger(RelayHandler.class);
    private final Channel relayChannel;

    public RelayHandler(Channel relayChannel) {
        this.relayChannel = relayChannel;
    }

    @Override
    public void channelActive(ChannelHandlerContext ctx) {
        ctx.writeAndFlush(Unpooled.EMPTY_BUFFER);
    }

    @Override
    public void channelRead(ChannelHandlerContext ctx, Object msg) {
        if (relayChannel.isActive()) {
            relayChannel.writeAndFlush(msg);
        } else {
            ReferenceCountUtil.release(msg);
        }
    }

    @Override
    public void channelInactive(ChannelHandlerContext ctx) {
        if (relayChannel.isActive()) {
            ChannelUtils.closeOnFlush(relayChannel);
        }
    }

    @Override
    public void exceptionCaught(ChannelHandlerContext ctx, Throwable cause) {
        logger.error("RelayHandler error", cause);
        try {
            if (relayChannel.isActive()) {
                relayChannel.close();
            }
        } finally {
            ctx.close();
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