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Create a Google Guava Cache using a complex key
CacheLoader<Pair<String, String>, String> loader =
    new CacheLoader<Pair<String, String>, String>() {
       public String load(Pair<String, String> key) {
           return GetRatingIdentityByShortNameLoader(key.first, key.second);
       }
    };

_ratingIdCache = CacheBuilder.newBuilder()
    .concurrencyLevel(a_conclevel.intValue())
    .maximumSize(a_maxsize.intValue())
    .expireAfterAccess(a_maxage.intValue(), TimeUnit.MINUTES)
    .build(loader);

Cache<String, String> _ratingAgencyId;

Cache<Pair<String, String>, String> _ratingAgencyId;