internal void MakeOutOfDate()
{
bool wasUpToDate = false;
lock (this)
{
if (_status == StatusType.UP_TO_DATE ||
_status == StatusType.UPDATING)
{
wasUpToDate = true;
// Tell all precedents to forget about me.
for (PrecedentNode current = _firstPrecedent; current != null; current = current.Next)
{
current.Precedent.RemoveDependent(this);
}
_firstPrecedent = null;
if (_status == StatusType.UP_TO_DATE)
{
_status = StatusType.OUT_OF_DATE;
}
else if (_status == StatusType.UPDATING)
{
_status = StatusType.UPDATING_AND_OUT_OF_DATE;
}
if (Invalidated != null)
{
Invalidated();
}
}
}
if (wasUpToDate)
{
// Make all indirect dependents out-of-date, too.
MakeDependentsOutOfDate();
}
}
internal bool AddPrecedent( Precedent precedent )
{
lock ( this )
{
if ( _status == StatusType.UPDATING )
{
_firstPrecedent = new PrecedentNode { Precedent = precedent, Next = _firstPrecedent };
return true;
}
else if ( _status != StatusType.UPDATING_AND_OUT_OF_DATE )
Debug.Assert( false, "Unexpected state in AddPrecedent" );
return false;
}
}
internal void MakeOutOfDate()
{
bool wasUpToDate = false;
lock ( this )
{
if ( _status == StatusType.UP_TO_DATE ||
_status == StatusType.UPDATING )
{
wasUpToDate = true;
// Tell all precedents to forget about me.
for (PrecedentNode current = _firstPrecedent; current != null; current = current.Next)
current.Precedent.RemoveDependent(this);
_firstPrecedent = null;
if ( _status == StatusType.UP_TO_DATE )
_status = StatusType.OUT_OF_DATE;
else if ( _status == StatusType.UPDATING )
_status = StatusType.UPDATING_AND_OUT_OF_DATE;
if (Invalidated != null)
Invalidated();
}
}
if (wasUpToDate)
// Make all indirect dependents out-of-date, too.
MakeDependentsOutOfDate();
}
