public ClusteredIndex(TreeTable Table)
: base()
{
this._Storage = Table;
this._Parent = Table;
this._Header = new IndexHeader(Table.Name, -1, -1, -1, 0, 0, Table.BaseTree.Comparer);
this._IndexColumns = Table.BaseTree.Comparer;
this._Tree = Table.BaseTree;
}
/// <summary>
/// Gets a table, either from memory or disk
/// </summary>
/// <param name="Key"></param>
/// <returns></returns>
public Table RequestTable(string Key)
{
// #DEBUG# //
this._Host.DebugPrint("TableStore.RequestTable({0})", Key);
this._Host.DebugDepth++;
if (this.TableIsInMemory(Key))
{
// #DEBUG# //
this._Host.DebugPrint("TableStore.RequestTable->Table in memory({0})", Key);
return(this._TableStore[Key]);
}
else
{
// Get the header //
TableHeader h = Buffer(Key);
Table t;
// Create the actual table //
if (h.RootPageID == -1)
{
t = new HeapTable(this._Host, h);
// #DEBUG# //
this._Host.DebugPrint("TableStore.RequestTable->Table not in memory; buffering table as HEAP ({0})", Key);
}
else
{
t = new TreeTable(this._Host, h);
// #DEBUG# //
this._Host.DebugPrint("TableStore.RequestTable->Table not in memory; buffering table as CLUSTER ({0})", Key);
}
// Add to the table store //
this.PushTable(t);
// Need to buffer a block of pages and make sure these pages are not in memory
// Check to see how many pages we can buffer //
int MaxPages = (int)(this.FreeMemory / h.PageSize);
int Pages = Math.Min(h.PageCount, MaxPages);
// Buffer a block of pages //
// #DEBUG# //
this._Host.DebugPrint("TableStore.RequestTable->Buffering a block of pages ({0}); from {1} - {2} of {3}", Key, 0, Pages, h.PageCount);
foreach (Page p in BufferBlock(h, 0, Pages))
{
PageUID k = new PageUID(Key, p.PageID);
if (this._PageStore.ContainsKey(k))
{
this._PageStore[k] = p;
}
else
{
this._PageStore.Add(k, p);
}
}
this._Host.DebugDepth--;
return(t);
}
}
