/// <summary>Loads a node from its id.</summary>
/// <remarks>
/// Loads a node from its id. Tries to get if from memory, if not present
/// then loads it from odb storage
/// </remarks>
/// <param name="id">The id of the nod</param>
/// <returns>The node with the specific id</returns>
public virtual NeoDatis.Btree.IBTreeNode LoadNodeById(object id)
{
NeoDatis.Odb.OID oid = (NeoDatis.Odb.OID)id;
// Check if node is in memory
NeoDatis.Btree.IBTreeNode node = (NeoDatis.Btree.IBTreeNode)oids[oid];
if (node != null)
{
nbLoadNodesFromCache++;
return(node);
}
nbLoadNodes++;
// else load from odb
try
{
if (NeoDatis.Odb.OdbConfiguration.IsDebugEnabled(LogId))
{
NeoDatis.Tool.DLogger.Debug("Loading node with id " + oid);
}
if (oid == null)
{
throw new NeoDatis.Odb.ODBRuntimeException(NeoDatis.Btree.BTreeError.InvalidIdForBtree
.AddParameter(oid));
}
NeoDatis.Btree.IBTreeNode pn = (NeoDatis.Btree.IBTreeNode)engine.GetObjectFromOid
(oid);
pn.SetId(oid);
if (tree != null)
{
pn.SetBTree(tree);
}
// Keep the node in memory
oids.Add(oid, pn);
return(pn);
}
catch (System.Exception e)
{
throw new NeoDatis.Odb.ODBRuntimeException(NeoDatis.Btree.BTreeError.InternalError
, e);
}
}
/// <summary>
/// saves the bree node Only puts the current node in an 'modified Node' map
/// to be saved on commit
/// </summary>
public virtual object SaveNode(NeoDatis.Btree.IBTreeNode node)
{
NeoDatis.Odb.OID oid = null;
// Here we only save the node if it does not have id,
// else we just save into the hashmap
if (node.GetId() == NeoDatis.Odb.Impl.Core.Layers.Layer3.Engine.StorageEngineConstant
.NullObjectId)
{
try
{
nbSaveNodes++;
// first get the oid. : -2:it could be any value
oid = engine.GetObjectWriter().GetIdManager().GetNextObjectId(-2);
node.SetId(oid);
oid = engine.Store(oid, node);
if (NeoDatis.Odb.OdbConfiguration.IsDebugEnabled(LogId))
{
NeoDatis.Tool.DLogger.Debug("Saved node id " + oid);
}
// + " : " +
// node.toString());
if (tree != null && node.GetBTree() == null)
{
node.SetBTree(tree);
}
oids.Add(oid, node);
return(oid);
}
catch (System.Exception e)
{
throw new NeoDatis.Odb.ODBRuntimeException(NeoDatis.Btree.BTreeError.InternalError
.AddParameter("While saving node"), e);
}
}
nbSaveNodesInCache++;
oid = (NeoDatis.Odb.OID)node.GetId();
oids.Add(oid, node);
AddModifiedOid(oid);
return(oid);
}
