• 更新内容

iot-modbus本次发布的V3.2.6版本支持设备上线、掉线、处理业务异常监听处理，请看下面的源码解读。

• 设备上线监听源码解读

主要是在MiiListenerHandler重写了channelActive方法

@Override  public void channelActive(ChannelHandlerContext ctx) throws Exception {    Channel channel = ctx.channel();    if(!JudgeEmptyUtils.isEmpty(channel.remoteAddress())){      String address = channel.remoteAddress().toString().substring(1,channel.remoteAddress().toString().length());      ChannelConnectData connectServerData = new ChannelConnectData(this, DeviceConnectEnum.ON_LINE.getKey(), address);      if(!JudgeEmptyUtils.isEmpty(connectServerData) && !JudgeEmptyUtils.isEmpty(getApplicationContext)){        getApplicationContext.publishEvent(connectServerData);      }    }  }

• 设备掉线监听源码解读

主要是在MiiListenerHandler重写了channelInactive方法。​​​​​​​

@Override  public void channelInactive(ChannelHandlerContext ctx) throws Exception {    Channel channel = ctx.channel();    if(!JudgeEmptyUtils.isEmpty(channel.remoteAddress())){      String address = channel.remoteAddress().toString().substring(1,channel.remoteAddress().toString().length());      ChannelConnectData connectServerData = new ChannelConnectData(this, DeviceConnectEnum.BREAK_OFF.getKey(), address);      if(!JudgeEmptyUtils.isEmpty(connectServerData) && !JudgeEmptyUtils.isEmpty(getApplicationContext)){        getApplicationContext.publishEvent(connectServerData);      }    }    //连接断开后的最后处理    ctx.pipeline().remove(this);    ctx.deregister();    ctx.close();  }

• 处理业务异常监听源码解读

主要是增加了MiiExceptionHandler处理器，并在服务端MiiServer和客户端MiiClient初始化initChannel时添加进入。​​​​​​​

package com.takeoff.iot.modbus.netty.handle;
import com.takeoff.iot.modbus.common.entity.ChannelConnectData;import com.takeoff.iot.modbus.common.enums.DeviceConnectEnum;import com.takeoff.iot.modbus.common.utils.JudgeEmptyUtils;import com.takeoff.iot.modbus.common.utils.SpringContextUtil;import org.springframework.context.ApplicationContext;
import io.netty.channel.Channel;import io.netty.channel.ChannelDuplexHandler;import io.netty.channel.ChannelHandlerContext;import lombok.extern.slf4j.Slf4j;
@Slf4jpublic class MiiExceptionHandler extends ChannelDuplexHandler {    private ApplicationContext getApplicationContext = SpringContextUtil.applicationContext;    public MiiExceptionHandler(){      }
  @Override    public void exceptionCaught(ChannelHandlerContext ctx, Throwable cause) throws Exception {       Channel channel = ctx.channel();      if(!JudgeEmptyUtils.isEmpty(channel.remoteAddress())){        String address = channel.remoteAddress().toString().substring(1,channel.remoteAddress().toString().length());          ChannelConnectData connectServerData = new ChannelConnectData(this, DeviceConnectEnum.ABNORMAL.getKey(), address);            if(!JudgeEmptyUtils.isEmpty(connectServerData) && !JudgeEmptyUtils.isEmpty(getApplicationContext)){              getApplicationContext.publishEvent(connectServerData);            }            //由Tail节点对异常进行统一处理            if(cause instanceof RuntimeException){                log.info("处理业务异常："+channel.remoteAddress());            }            super.exceptionCaught(ctx, cause);      }    }}

• 连接监听器源码解读

主要通过spring的发布时间监听来处理，增加连接监听器ChannelConnectListener。​​​​​​​

package com.takeoff.iot.modbus.test.listener;
import com.takeoff.iot.modbus.common.entity.ChannelConnectData;import com.takeoff.iot.modbus.common.utils.JudgeEmptyUtils;import org.springframework.context.event.EventListener;import org.springframework.stereotype.Component;
import lombok.extern.slf4j.Slf4j;
@Slf4j@Componentpublic class ChannelConnectListener {
  @EventListener  public void handleReceiveDataEvent(ChannelConnectData data) {    if(JudgeEmptyUtils.isEmpty(data.getDeviceConnect())){      log.info("设备连接状态码："+data.getDeviceConnect()+" ---> "+data.getConnectMsg());    }  }}