Spring Cache with collection of items/entities

Question

I am using Spring Cache, where I pass in a collection of keys, and the return is a list of entities. I would like to have the caching framework understand that each element

Answer 1

With @CachePut and a helper method you can achieve it very simply like this :

public List getAllByCode(Listcodes) {
    return countryDao.findAllInCodes(codes);
}

public void preloadCache(Listcodes) {
    List allCountries = getAllByCode(codes);
    for (Country country : allCountries) {
        cacheCountry(country);
    }
}

@CachePut
public Country cacheCountry(Country country) {
    return country;
}

Note

This will only add values to the cache, but never remove old values. You can easily do cache eviction before you add new values

Option 2

There is a proposal to make it work like this :

@CollectionCacheable
public List getAllByCode(Listcodes) {    

See :

• https://github.com/spring-projects/spring-framework/issues/23221
• https://github.com/neiser/spring-collection-cacheable

If you are impatient take the code from GitHub and integrate locally