code: @Override
      public void delete(final String sagaId) {
          checkNotNull(sagaId, "Saga id key must be set.");
  
          synchronized (sync) {
              StateStorageItem removedItem = storedStates.remove(sagaId);
              if (removedItem != null) {
                  removeInstancesForItem(removedItem);
              }
          }
      }
docs: {@inheritDoc}