/// <summary>
/// A reference to this index after it was loaded into the memory
/// or connected by a proxy class
/// </summary>
private Exceptional<IVersionedIndexObject<IndexKey, ObjectUUID>> GetIndexReference(DBIndexManager indexManager)
{
if (_indexReference == null)
{
if (!indexManager.HasIndex(IndexType))
{
// the index type does not exist anymore - return null or throw exception
return new Exceptional<IVersionedIndexObject<IndexKey, ObjectUUID>>(new GraphDBError("Index is away!"));
}
var emptyIdx = indexManager.GetIndex(IndexType);
if (!emptyIdx.Success())
{
return emptyIdx;
}
var indexExceptional = indexManager.LoadOrCreateDBIndex(FileSystemLocation, emptyIdx.Value);
if (indexExceptional.Failed())
{
return new Exceptional<IVersionedIndexObject<IndexKey, ObjectUUID>>(indexExceptional);
}
_indexReference = indexExceptional.Value;
}
return new Exceptional<IVersionedIndexObject<IndexKey, ObjectUUID>>(_indexReference);
}
/// <summary>
/// A reference to this index after it was loaded into the memory
/// or connected by a proxy class
/// </summary>
/// <param name="indexManager">The database index manager</param>
/// <param name="idxShard">The shard that should be loaded</param>
/// <returns>A versioned idx object</returns>
public Exceptional<IVersionedIndexObject<IndexKey, ObjectUUID>> GetIndexReference(DBIndexManager indexManager, int idxShard)
{
if (!indexManager.HasIndex(IndexType))
{
// the index type does not exist anymore - return null or throw exception
return new Exceptional<IVersionedIndexObject<IndexKey, ObjectUUID>>(new GraphDBError("Index is away!"));
}
var emptyIdx = new VersionedHashIndexObject<IndexKey, ObjectUUID>();
var indexExceptional = indexManager.LoadOrCreateShardedDBIndex(FileSystemLocation + idxShard.ToString(), emptyIdx, this);
if (indexExceptional.Failed())
{
return new Exceptional<IVersionedIndexObject<IndexKey, ObjectUUID>>(indexExceptional);
}
return indexExceptional;
}