Spring cache/jsr107: list/collection argument as part of the key

Question

I have a service which calls external system to retrieve some kind of objects by their external id as well as submit them back to update. Rather than retrieving objects one

Answer 1

For me it worked fine with this config. This is a obfuscated version of my code.

@Cacheable(cacheNames = "test", key = "#p0")
public List<String> getTestFunction(List<String> someIds) {

getTestFunction(Arrays.asList("A","B","C"));

2020-04-02 15:12:35.492 TRACE 18040 --- [Test worker] o.s.cache.interceptor.CacheInterceptor   : Computed cache key '[A, B, C]' for operation Builder[public java.util.List org.Main.getTestFunction(java.util.List)] caches=[test] | key='#p0' | keyGenerator='' | cacheManager='' | cacheResolver='' | condition='' | unless='' | sync='false'

You see that it concatinated strings

... Computed cache key '[A, B, C]' ...

My setup: /resources/ehcache.xml

<?xml version="1.0" encoding="UTF-8"?>
<ehcache>
    <cache name="test"
           maxBytesLocalHeap="1M"
           timeToLiveSeconds="300"/>
</ehcache>

gradle.build

plugins {
    id "org.springframework.boot" version "2.2.4.RELEASE"
    ....
}
dependencies {
    implementation "org.springframework.boot:spring-boot-starter-cache"
    implementation "org.ehcache:ehcache:3.8.1"
    ...
}

Answer 2

AFAIK this is not possible with annotations. You can use the imperative API, which contains the bulk operations you need, for example Cache.getAll(keySet) and Cache.removeAll(keySet)