CODEWITHSUNDEEP
javaredisjediskeydb
mjs
mjs

Reputation: 22369

Redis set key, val only if val matches a previous one for concurrency

How can one do this? Using Jedis and Java.

I am working with hset right now, but does no really matter.

Does one have to send along lua code to achieve this? How is that done with Jedis?

Upvotes: 3

Views: 843

Answers (1)

sazzad
sazzad

Reputation: 6267

Here is a Check-n-set for HSET command using LUA.

Jedis jedis;
String key, field, oldValueToCheck, newValueToSet;

jedis.eval("if redis.call('HGET', KEYS[1], ARGV[1]) == ARGV[3]"
    + " then return redis.call('HSET', KEYS[1], ARGV[1], ARGV[2])"
    + " else return 'NA' end", 1, key, field, newValueToSet, oldValueToCheck);

Upvotes: 1

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