package com.genersoft.iot.vmp.gb28181.event.offline;
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import org.springframework.beans.factory.annotation.Autowired;
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import org.springframework.data.redis.connection.Message;
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import org.springframework.data.redis.listener.KeyExpirationEventMessageListener;
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import org.springframework.data.redis.listener.RedisMessageListenerContainer;
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import org.springframework.stereotype.Component;
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import com.genersoft.iot.vmp.common.VideoManagerConstants;
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import com.genersoft.iot.vmp.gb28181.event.EventPublisher;
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/**
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* @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
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* @author: songww
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* @date: 2020年5月6日 上午11:35:46
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*/
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@Component
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public class KeepliveTimeoutListener extends KeyExpirationEventMessageListener {
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@Autowired
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private EventPublisher publisher;
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public KeepliveTimeoutListener(RedisMessageListenerContainer listenerContainer) {
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super(listenerContainer);
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}
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/**
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* 监听失效的key，key格式为keeplive_deviceId
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* @param message
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* @param pattern
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*/
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@Override
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public void onMessage(Message message, byte[] pattern) {
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// 获取失效的key
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String expiredKey = message.toString();
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if(!expiredKey.startsWith(VideoManagerConstants.KEEPLIVEKEY_PREFIX)){
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System.out.println("收到redis过期监听，但开头不是"+VideoManagerConstants.KEEPLIVEKEY_PREFIX+"，忽略");
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return;
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}
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String deviceId = expiredKey.substring(VideoManagerConstants.KEEPLIVEKEY_PREFIX.length(),expiredKey.length());
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publisher.outlineEventPublish(deviceId, VideoManagerConstants.EVENT_OUTLINE_TIMEOUT);
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}
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}
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