[FIXED] Spring cache for specific values @Cacheable annotation

Issue

I want to cache a result of a method only when the attribute of the result contains specific values. For example

Class APIOutput(code: Int, message: String)

sealed class Response<out T : Any> : Serializable {
    data class Success<out T : Any>(val data: T) : Response<T>()
    data class Error(val errorText: String, val errorCode: Int) : Response<Nothing>()
}

@Cacheable(
        key = "api-key",
        unless = "do something here"
    )
fun doApicall(uniqueId: Long): Response<APIOutput> {
        //make API call
        val output = callAPI(uniqueId)
        return Response.Success(output)
}

In the above method, I want to cache the response only when Response.Success.data.code == (long list of codes). Please note, in the previous line data is nothing but APIOutput object. How could I achieve it using unless or any other approach. I was thinking of writing a function that takes a doApicall method result as input and would return true or false and call that method it as unless="call a method". But I'm not sure how to do it. Any help is highly appreciated.

Solution

Thanks Yatharth and John! Below is the condition that worked for me. resultcodes in the below expression is a list

@Cacheable(
            key = "api-key",
            unless = "!(#result instanceof T(com.abc.Response\$Success)) 
            or (#result instanceof T(com.abc.Response\$Success) 
            and !(T(com.abc.APIStatus).resultCodes.contains(#result.data.code)))"
)
fun doApicall(uniqueId: Long): Response<APIOutput> {
    //make API call
    val output = callAPI(uniqueId)
    return Response.Success(output)
}

Answered By - Sarav