How to use

findOne

method

in

de.otto.edison.mongo.AbstractMongoRepository

/**
 * Find a single value with the specified key, if existing.
 *
 * @param key the key to search for
 * @return an Optional containing the requested value, or {@code Optional.empty()} if no value with this key exists
 */
public Optional<V> findOne(final K key) {
  return findOne(key, mongoProperties.getDefaultReadTimeout(), TimeUnit.MILLISECONDS);
}

/**
 * Find a single value with the specified key, if existing.
 *
 * @param key the key to search for
 * @return an Optional containing the requested value, or {@code Optional.empty()} if no value with this key exists
 */
public Optional<V> findOne(final K key) {
  return findOne(key, mongoProperties.getDefaultReadTimeout(), TimeUnit.MILLISECONDS);
}

public void updateIfMatch(final V value, final String eTag) {
  Bson query = and(eq(AbstractMongoRepository.ID, keyOf(value)), eq(ETAG, eTag));
  Document updatedETaggable = collection().findOneAndReplace(query, encode(value), new FindOneAndReplaceOptions().returnDocument(AFTER));
  if (isNull(updatedETaggable)) {
    Optional<V> findById = findOne(keyOf(value));
    if (findById.isPresent()) {
      throw new ConcurrentModificationException("Entity concurrently modified: " + keyOf(value));
    }
    throw new NotFoundException("Entity does not exist: " + keyOf(value));
  }
}