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package com.feingto.iot.common.handler;

import com.feingto.iot.common.exception.ServiceException;
import io.netty.channel.ChannelHandlerContext;
import io.netty.channel.SimpleChannelInboundHandler;
import io.netty.handler.codec.mqtt.MqttMessage;

import java.util.Optional;

/**
 * 通道Inbound处理器抽象
 *
 * @author longfei
 */
public abstract class DefaultSimpleChannelHandler extends SimpleChannelInboundHandler {
    public abstract void handleMessage(ChannelHandlerContext ctx, T msg) throws Exception;

    @Override
    protected void channelRead0(ChannelHandlerContext ctx, T msg) throws Exception {
        if (msg instanceof MqttMessage) {
            Optional.ofNullable(((MqttMessage) msg).fixedHeader())
                    .ifPresent(fixedHeader -> {
                        try {
                            handleMessage(ctx, msg);
                        } catch (Exception e) {
                            e.printStackTrace();
                            throw new ServiceException(e.getMessage());
                        }
                    });
        } else {
            handleMessage(ctx, msg);
        }
    }

    /**
     * 当Channel上的某个读操作完成时被调用
     */
    @Override
    public void channelReadComplete(ChannelHandlerContext ctx) {
        ctx.flush();
    }

    /**
     * 处理过程中ChannelPipeline中发生错误时被调用
     */
    @Override
    public void exceptionCaught(ChannelHandlerContext ctx, Throwable cause) {
        cause.printStackTrace();
        ctx.close();
    }
}