protected internal virtual ContentSummaryComputationContext ComputeDirectoryContentSummary
(ContentSummaryComputationContext summary, int snapshotId)
{
ReadOnlyList <INode> childrenList = GetChildrenList(snapshotId);
// Explicit traversing is done to enable repositioning after relinquishing
// and reacquiring locks.
for (int i = 0; i < childrenList.Size(); i++)
{
INode child = childrenList.Get(i);
byte[] childName = child.GetLocalNameBytes();
long lastYieldCount = summary.GetYieldCount();
child.ComputeContentSummary(summary);
// Check whether the computation was paused in the subtree.
// The counts may be off, but traversing the rest of children
// should be made safe.
if (lastYieldCount == summary.GetYieldCount())
{
continue;
}
// The locks were released and reacquired. Check parent first.
if (GetParent() == null)
{
// Stop further counting and return whatever we have so far.
break;
}
// Obtain the children list again since it may have been modified.
childrenList = GetChildrenList(snapshotId);
// Reposition in case the children list is changed. Decrement by 1
// since it will be incremented when loops.
i = NextChild(childrenList, childName) - 1;
}
// Increment the directory count for this directory.
summary.GetCounts().AddContent(Content.Directory, 1);
// Relinquish and reacquire locks if necessary.
summary.Yield();
return(summary);
}