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is there option provided by redis to do partial updates to cache objects

I am storing data in redis using JCA(java caching api) where key is String and value is Object which is JSON string.
I have a requirement to perform partial update to cache value instead of retrieving cache value using key and then modify attribute and perform put operation with latest cache value

{
  "attribute1" : "value1",
   "attribute2 " : [
  {
   "attribute3" : "value3"
  }
]
}

Above is sample json format. As explained above is it possible to update value of attribute1 from value1 to value2 without geting cache value using key in redis

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2

Answers


  1. 0

    You can use a Lua script, so that using the CJSON Lua library you update the item. I have shared a similar example on How to nest a list into a structure in Redis to reduce top level?

    Not familiar with JCA, so not sure if your client would make it simple to send an EVAL command.

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  2. 0

    Assuming you are using JCache API (ie JSR-107), you can use Cache#invoke(K key, EntryProcessor<K,V,T> entryProcessor, Object... arguments) to perform an update in-place instead of get-then-put. According to EntryProcessor javadoc, Cache#invoke is executed atomically on the key, so you don’t have to worry about concurrent modifications to the same cache entry.

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