libilibi项目总结（9）在线观看人数_reportvideoplayonline-优快云博客

Controller

//获取视频观看在线人数
    @RequestMapping("/reportVideoPlayOnline")
    public ResponseVO reportVideoPlayOnline(@NotEmpty String fileId, String deviceId) {
    	//传入文件id和设备id
        Integer count = redisComponent.reportVideoPlayOnline(fileId, deviceId);
        return getSuccessResponseVO(count);
    }

redisComponent.reportVideoPlayOnline(fileId, deviceId);

public Integer reportVideoPlayOnline(String fileId, String deviceId) {
        //用户对应的键
        String userPlayOnlineKey = String.format(Constants.REDIS_KEY_VIDEO_PLAY_COUNT_USER, fileId, deviceId);
        //视频对应的键
        String playOnlineCountKey = String.format(Constants.REDIS_KEY_VIDEO_PLAY_COUNT_ONLINE, fileId);

        //用户刚开始看视频
        if (!redisUtils.keyExists(userPlayOnlineKey)) {
            //设置用户八秒的过期时间
            redisUtils.setex(userPlayOnlineKey, fileId, Constants.REDIS_KEY_EXPIRES_ONE_SECONDS * 8);
            //增长视频对应的在线观看人数
            return redisUtils.incrementex(playOnlineCountKey, Constants.REDIS_KEY_EXPIRES_ONE_SECONDS * 10).intValue();
        }
        //给视频在线总数量续期
        redisUtils.expire(playOnlineCountKey, Constants.REDIS_KEY_EXPIRES_ONE_SECONDS * 10);
        //给播放用户续期
        redisUtils.expire(userPlayOnlineKey, Constants.REDIS_KEY_EXPIRES_ONE_SECONDS * 8);
        //获得当前的在线观看人数
        Integer count = (Integer) redisUtils.get(playOnlineCountKey);
        //默认是1人在观看
        return count == null ? 1 : count;
    }

RedisKeyExpirationListener

该类负责监听 Redis 中键的过期事件，并处理用户观看结束后减少视频的在线人数

	@Component
@Slf4j
public class RedisKeyExpirationListener extends KeyExpirationEventMessageListener {
    @Resource
    private RedisComponent redisComponent;

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

    @Override
    public void onMessage(Message message, byte[] pattern) {
        String key = message.toString();
        if (!key.startsWith(Constants.REDIS_KEY_VIDEO_PLAY_COUNT_ONLINE_PREIFX + Constants.REDIS_KEY_VIDEO_PLAY_COUNT_USER_PREFIX)) {
            return;
        }
        //监听 在线用户过期的key
        Integer userKeyIndex = key.indexOf(Constants.REDIS_KEY_VIDEO_PLAY_COUNT_USER_PREFIX) + Constants.REDIS_KEY_VIDEO_PLAY_COUNT_USER_PREFIX.length();
        //获得对应视频的key
        String fileId = key.substring(userKeyIndex, userKeyIndex + Constants.LENGTH_20);
        //减少该视频当前在线观看人数的数量
        redisComponent.decrementPlayOnlineCount(String.format(Constants.REDIS_KEY_VIDEO_PLAY_COUNT_ONLINE, fileId));
    }
}