private static void ManageIndexesForUpdate(OID oid, NonNativeObjectInfo nnoi, NonNativeObjectInfo oldMetaRepresentation)
{
// takes the indexes from the oldMetaRepresentation because noi comes
// from the client and is not always
// in sync with the server meta model (In Client Server mode)
var indexes = oldMetaRepresentation.GetClassInfo().GetIndexes();
foreach (var index in indexes)
{
var oldKey = IndexTool.BuildIndexKey(index.Name, oldMetaRepresentation, index.AttributeIds);
var newKey = IndexTool.BuildIndexKey(index.Name, nnoi, index.AttributeIds);
// Only update index if key has changed!
if (oldKey.CompareTo(newKey) != 0)
{
var btree = index.BTree;
// TODO manage collision!
// Unused old value - result from delete
btree.Delete(oldKey, oid);
// TODO check if old is equal to oldKey
btree.Insert(newKey, oid);
// Check consistency : index should have size equal to the class
// info element number
if (index.BTree.GetSize() != nnoi.GetClassInfo().NumberOfObjects)
{
throw new OdbRuntimeException(
NDatabaseError.BtreeSizeDiffersFromClassElementNumber.AddParameter(index.BTree.GetSize())
.AddParameter(nnoi.GetClassInfo().NumberOfObjects));
}
}
}
}
private IOdbComparable BuildOrderByKey(NonNativeObjectInfo nnoi)
{
// TODO cache the attributes ids to compute them only once
var queryManager = DependencyContainer.Resolve <IQueryManager>();
var orderByAttributeIds = queryManager.GetOrderByAttributeIds(ClassInfo, Query);
return(IndexTool.BuildIndexKey("OrderBy", nnoi, orderByAttributeIds));
}
/// <summary>
/// Take the fields of the index and take value from the query
/// </summary>
/// <param name="index"> The index </param>
/// <returns> The key of the index </returns>
protected virtual IOdbComparable ComputeIndexKey(ClassInfoIndex index)
{
var attributesNames = ClassInfo.GetAttributeNames(index.AttributeIds);
var constraint = Query.GetCriteria();
var values = ((IInternalConstraint)constraint).GetValues();
return(IndexTool.BuildIndexKey(index.Name, values, attributesNames));
}
// This method os not used in Values Query API
public void ObjectMatch(OID oid, object @object, IOdbComparable orderByKey)
{
var values = (AttributeValuesMap)@object;
var groupByKey = IndexTool.BuildIndexKey("GroupBy", values, _groupByFieldList);
var result = _groupByResult[groupByKey];
if (result == null)
{
result = new ValuesQueryResultAction(_query, null, _instanceBuilder);
result.Start();
_groupByResult.Add(groupByKey, result);
}
result.ObjectMatch(oid, @object, orderByKey);
}
public void AddIndexOn(string className, string indexName, string[] indexFields,
bool acceptMultipleValuesForSameKey)
{
var classInfo = GetMetaModel().GetClassInfo(className, true);
if (classInfo.HasIndex(indexName))
{
throw new OdbRuntimeException(
NDatabaseError.IndexAlreadyExist.AddParameter(indexName).AddParameter(className));
}
var classInfoIndex = classInfo.AddIndexOn(indexName, indexFields, acceptMultipleValuesForSameKey);
IBTree btree;
var lazyOdbBtreePersister = new LazyOdbBtreePersister(this);
if (acceptMultipleValuesForSameKey)
{
btree = new OdbBtreeMultiple(OdbConfiguration.GetIndexBTreeDegree(), lazyOdbBtreePersister);
}
else
{
btree = new OdbBtreeSingle(OdbConfiguration.GetIndexBTreeDegree(), lazyOdbBtreePersister);
}
classInfoIndex.BTree = btree;
Store(classInfoIndex);
// Now The index must be updated with all existing objects.
if (classInfo.NumberOfObjects == 0)
{
// There are no objects. Nothing to do
return;
}
var numberOfObjectsAsString = classInfo.NumberOfObjects.ToString();
Log4NetHelper.Instance.LogInfoMessage(
string.Format(
"StorageEngine: Creating index {0} on class {1} - Class has already {2} Objects. Updating index",
indexName, className, numberOfObjectsAsString));
Log4NetHelper.Instance.LogInfoMessage(string.Format("StorageEngine: {0} : loading {1} objects from database", indexName,
numberOfObjectsAsString));
// We must load all objects and insert them in the index!
var criteriaQuery = new SodaQuery(classInfo.UnderlyingType);
var objects = GetObjectInfos(criteriaQuery);
numberOfObjectsAsString = classInfo.NumberOfObjects.ToString();
Log4NetHelper.Instance.LogInfoMessage(string.Format("StorageEngine: {0} : {1} objects loaded", indexName, numberOfObjectsAsString));
while (objects.HasNext())
{
var nnoi = (NonNativeObjectInfo)objects.Next();
var odbComparable = IndexTool.BuildIndexKey(classInfoIndex.Name, nnoi, classInfoIndex.AttributeIds);
btree.Insert(odbComparable, nnoi.GetOid());
}
Log4NetHelper.Instance.LogInfoMessage(string.Format("StorageEngine: {0} created!", indexName));
}
private IOdbComparable BuildOrderByKey(AttributeValuesMap values)
{
return(IndexTool.BuildIndexKey("OrderBy", values, Query.GetOrderByFieldNames()));
}
