Hello Everyone,
I am new to NHibernate and have a seemingly simple question. I need to
avoid cycles in a tree structure (of folders, for example). My setter
for the ParentFolder looks something like this:
public virtual Folder ParentFolder
{
get { return _ParentFolder; }
set
{
if (!value.Equals(_ParentFolder))
{
Folder parent = value;
while (parent != null)
{
if (parent.Equals(this)) throw new Exception
("Cycle");
parent = parent.ParentFolder;
}
_ParentFolder = value;
}
}
}
However, this kind of protection does not avoid cycles with 100%
certainty. If (business) transaction#1 puts Folder A below Folder B
and a separate transaction#2 puts Folder B below Folder A, then both
transactions will pass, resulting in a persisted cycle.
How would you handle such a situation? Any simple solution without
making the entire tree the aggregate root and not allowing
simultaneous changes to the trees structure (i.e. I would prefer a
more "optimistic" approach to protecting the entire tree)?
thanks and enjoy,
ramin
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