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This article mainly introduces "what is the Redis List application scenario". In the daily operation, I believe many people have doubts about what the Redis List application scenario is. The editor consulted all kinds of materials and sorted out simple and easy-to-use operation methods. I hope it will be helpful for you to answer the doubts about "what is the Redis List application scenario?" Next, please follow the editor to study!

One: description of business requirements:

Query the ship docking data within a period of time, which involves the request for track points, the distance of track points can be calculated, and the ship can be calculated at other times. One of the problems is that the amount of data requested by the track point is so large that a very large amount of interface data is returned, about 10m. So I decided to show it in pages.

There is still a problem with this: the first load is still slow and more subsequent loads are available from redis.

Redis key design process:

1--start--end-mmsi

2-userId-mmsi

3-Flag [whether users pay]-mmsi

Private String getKey (Integer userId, Long mmsi) {return SHIP_HIS_AFF_PREFIX + ":" + userId + ":" + mmsi;}

Redis

The design greatly improves the query efficiency and the validity period is 3 hours.

The key API for RedisTemplate LIST operation is involved:

Long size = historicalAffiliationRedisTemplate.opsForList () .size (getKey (userId, mmsi)); List historicalAffiliations = historicalAffiliationRedisTemplate.opsForList () .range (redisKey, startIndex, endIndex); Long rows = historicalAffiliationRedisTemplate.opsForList (). LeftPushAll (redisKey, list); Duration duration = Duration.ofHours (3); historicalAffiliationRedisTemplate.opsForList (). GetOperations () .expire (redisKey, duration.getSeconds (), java.util.concurrent.TimeUnit.SECONDS)

Why use LIST as a data structure?

1 orderly operation

2 convenient scope to find similar paging

3The statistics are convenient.

Attached:

At this point, the study of "what is the Redis List application scenario" is over. I hope to be able to solve your doubts. The collocation of theory and practice can better help you learn, go and try it! If you want to continue to learn more related knowledge, please continue to follow the website, the editor will continue to work hard to bring you more practical articles!

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