code: public boolean remove(K key) {
          if (null == key)
              return false;
          CacheReference<K> keyRef = lookupFactory.createKey(key, queue);
          return CacheKey.class.cast(keyRef).removeCacheEntry();
      }
docs: Remove cache entry associated with the given key.
  @param key associated with cache value
  @return true if there was an entry to remove