internal ByteArrayBuffer PrepareRead(Transaction trans)
{
BTreeNodeCacheEntry cacheEntry = Btree().CacheEntry(this);
if (CanWrite())
{
return(null);
}
if (IsNew())
{
return(null);
}
Transaction systemTransaction = trans.SystemTransaction();
ByteArrayBuffer buffer = cacheEntry.Buffer();
if (buffer != null)
{
// Cache hit, still unread
buffer.Seek(0);
Read(systemTransaction, buffer);
cacheEntry.Buffer(null);
_btree.AddToProcessing(this);
return(null);
}
buffer = ProduceReadBuffer(systemTransaction);
ReadNodeHeader(buffer);
cacheEntry.Buffer(buffer);
return(buffer);
}
internal void PrepareWrite(Transaction trans)
{
if (_dead)
{
return;
}
BTreeNodeCacheEntry cacheEntry = Btree().CacheEntry(this);
if (CanWrite())
{
return;
}
ByteArrayBuffer buffer = cacheEntry.Buffer();
if (buffer != null)
{
buffer.Seek(0);
Read(trans.SystemTransaction(), buffer);
cacheEntry.Buffer(null);
}
else
{
Read(trans.SystemTransaction());
}
_btree.AddToProcessing(this);
}
private void Purge()
{
if (_nodes == null)
{
return;
}
Tree temp = _nodes;
_nodes = null;
_root.HoldChildrenAsIDs();
AddNode(_root);
temp.Traverse(new _IVisitor4_294());
for (IEnumerator entryIter = _nodeCache.GetEnumerator(); entryIter.MoveNext();)
{
BTreeNodeCacheEntry entry = ((BTreeNodeCacheEntry)entryIter.Current);
entry._node.HoldChildrenAsIDs();
}
}