/// <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);
}
public override Exceptional ClearAndRemoveFromDisc(DBIndexManager indexManager)
{
_indexReference = null;
return indexManager.RemoveDBIndex(FileSystemLocation);
}
internal Exceptional<IVersionedIndexObject<IndexKey, ObjectUUID>> LoadOrCreateDBIndex(ObjectLocation myShardObjectLocation, IVersionedIndexObject<IndexKey, ObjectUUID> myIIndexObject, AAttributeIndex correspondingIDX)
{
if (!(myIIndexObject is AFSObject))
{
return new Exceptional<IVersionedIndexObject<IndexKey, ObjectUUID>>(new Error_IndexIsNotPersistent(myIIndexObject));
}
var result = _IGraphFSSession.GetOrCreateFSObject<AFSObject>(myShardObjectLocation, DBConstants.DBINDEXSTREAM, () => myIIndexObject as AFSObject);
if (!result.Success())
{
return new Exceptional<IVersionedIndexObject<IndexKey, ObjectUUID>>(result);
}
else
{
if (result.Value.isNew)
{
//TODO: might be a performance bug
if (!_IGraphFSSession.ObjectExists(correspondingIDX.FileSystemLocation).Value)
{
result.PushIExceptional(_IGraphFSSession.CreateDirectoryObject(correspondingIDX.FileSystemLocation));
}
// Uncomment as soon as index is serializeable
result.PushIExceptional(_IGraphFSSession.StoreFSObject(result.Value, false));
//result.AddErrorsAndWarnings(result.Value.Save());
//ToDo: Fehler beim Speichern werden im Weiterm ignoriert statt darauf reagiert!
}
return new Exceptional<IVersionedIndexObject<IndexKey, ObjectUUID>>(result.Value as IVersionedIndexObject<IndexKey, ObjectUUID>);
}
}
private void SetIndexKeyAndValue(IVersionedIndexObject<IndexKey, ObjectUUID> currentIdxShardValue, IndexKey aIndexKex, ObjectUUID objectUUID, IndexSetStrategy myIndexSetStrategy)
{
UInt64 previousKeyCount = currentIdxShardValue.KeyCount();
currentIdxShardValue.Set(aIndexKex, objectUUID, myIndexSetStrategy);
UInt64 afterKeyCount = currentIdxShardValue.KeyCount();
if (afterKeyCount > previousKeyCount)
{
//so there is one more key...
IncreaseKeyCount();
}
IncreaseValueCount(1UL);
}
internal Exceptional<IVersionedIndexObject<IndexKey, ObjectUUID>> LoadOrCreateDBIndex(ObjectLocation myObjectLocation, IVersionedIndexObject<IndexKey, ObjectUUID> myIIndexObject)
{
if (!(myIIndexObject is AFSObject))
{
return new Exceptional<IVersionedIndexObject<IndexKey, ObjectUUID>>(new Error_IndexIsNotPersistent(myIIndexObject));
}
var result = _IGraphFSSession.GetOrCreateFSObject<AFSObject>(myObjectLocation, DBConstants.DBINDEXSTREAM, () => myIIndexObject as AFSObject);
if (!result.Success())
{
return new Exceptional<IVersionedIndexObject<IndexKey, ObjectUUID>>(result);
}
else
{
if (result.Value.isNew)
{
// Uncomment as soon as index is serializeable
result.PushIExceptional(_IGraphFSSession.StoreFSObject(result.Value, false));
//result.AddErrorsAndWarnings(result.Value.Save());
//ToDo: Fehler beim Speichern werden im Weiterm ignoriert statt darauf reagiert!
}
return new Exceptional<IVersionedIndexObject<IndexKey, ObjectUUID>>(result.Value as IVersionedIndexObject<IndexKey, ObjectUUID>);
}
}
