Redis cache instance parsing in Java Web

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1： Serviceimpl definition:

2： Add cache out (usually written in the service layer):

Logic: first get the data from the cache. If there is no data in the cache, get it from the database, then store the data in the cache, and get it from the cache the next time.

3： Cache synchronization

The problem is that once you modify or delete the data, the next time you fetch it, because there is data in the cache, it will be fetched in the cache. This is because the data in the database is inconsistent with the data in the cache, there will be differences, which requires cache synchronization.

In fact, it is very simple. When modifying and deleting (if adding is also necessary), perform the following operations:

1: Delete the cache, process the data, and put the data into the cache

2: Delete the cache and process the data (the data will be put into the cache when querying the data. The two cases are only the difference in write cache time)

summary

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