in src/main/java/com/amazonaws/secretsmanager/caching/SecretCache.java [89:95]
public SecretCache(SecretCacheConfiguration config) {
if (null == config) { config = new SecretCacheConfiguration(); }
this.cache = new LRUCache<String, SecretCacheItem>(config.getMaxCacheSize());
this.config = config;
this.client = config.getClient() != null ? config.getClient() :
AWSSecretsManagerClientBuilder.standard().build();
}