package com.genersoft.iot.vmp.gb28181.event.offline;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.data.redis.connection.Message;
import org.springframework.data.redis.listener.KeyExpirationEventMessageListener;
import org.springframework.data.redis.listener.RedisMessageListenerContainer;
import org.springframework.stereotype.Component;

import com.genersoft.iot.vmp.common.VideoManagerConstants;
import com.genersoft.iot.vmp.gb28181.event.EventPublisher;

/**    
 * @Description:设备心跳超时监听,借助redis过期特性，进行监听，监听到说明设备心跳超时，发送离线事件
 * @author: swwheihei
 * @date:   2020年5月6日 上午11:35:46     
 */
@Component
public class KeepliveTimeoutListener extends KeyExpirationEventMessageListener {

	@Autowired
	private EventPublisher publisher;

	public KeepliveTimeoutListener(RedisMessageListenerContainer listenerContainer) {
		super(listenerContainer);
	}

	/**
     * 监听失效的key，key格式为keeplive_deviceId
     * @param message
     * @param pattern
     */
    @Override
    public void onMessage(Message message, byte[] pattern) {
        //  获取失效的key
        String expiredKey = message.toString();
        if(!expiredKey.startsWith(VideoManagerConstants.KEEPLIVEKEY_PREFIX)){
        	System.out.println("收到redis过期监听，但开头不是"+VideoManagerConstants.KEEPLIVEKEY_PREFIX+"，忽略");
        	return;
        }
        
        String deviceId = expiredKey.substring(VideoManagerConstants.KEEPLIVEKEY_PREFIX.length(),expiredKey.length());
        publisher.outlineEventPublish(deviceId, VideoManagerConstants.EVENT_OUTLINE_TIMEOUT);
    }
}