@Override
    public V get(final K key) {
        if (contains(key)) {
            val cacheKey = buildKey(key);
            return this.mapInstance.get(cacheKey);
        }
        return null;
    }
(Distributed) map instances that holds the data.
core/cas-server-core-util-api/src/main/java/org/apereo/cas/util/cache/MappableDistributedCacheManager.java