code: @Override
      public void deleteAll() {
          try {
              if (localCache != null) {
                  localCache.deleteAll();
              }
              if (remoteCache != null) {
                  remoteCache.deleteAll();
              }
          } catch (Exception e) {
              throw e instanceof CacheException ? (CacheException) e : new CacheException(e);
          }
      }
docs: Deletes all entries in both local and remote caches.