/// <summary>
/// Drop a collection - remove all data pages + indexes pages
/// </summary>
public void Drop(CollectionPage col, CacheService cache)
{
// add all pages to delete
var pages = new HashSet <uint>();
// search for all data page and index page
foreach (var index in col.GetIndexes(true))
{
// get all nodes from index
var nodes = _indexer.FindAll(index, Query.Ascending);
foreach (var node in nodes)
{
// if is PK index, add dataPages
if (index.Slot == 0)
{
pages.Add(node.DataBlock.PageID);
// read datablock to check if there is any extended page
var block = _data.Read(node.DataBlock, false);
if (block.ExtendPageID != uint.MaxValue)
{
_pager.DeletePage(block.ExtendPageID, true);
cache.CheckPoint();
}
}
// add index page to delete list page
pages.Add(node.Position.PageID);
}
// remove head+tail nodes in all indexes
pages.Add(index.HeadNode.PageID);
pages.Add(index.TailNode.PageID);
}
// and now, lets delete all this pages
foreach (var pageID in pages)
{
_pager.DeletePage(pageID);
cache.CheckPoint();
}
// get header page to remove from collection list links
var header = _pager.GetPage <HeaderPage>(0, true);
header.CollectionPages.Remove(col.CollectionName);
_pager.DeletePage(col.PageID);
}
public static void Dump(this CollectionPage page, StringBuilder sb)
{
sb.AppendFormat("'{0}', Count: {1}, FreeDataPageID: {2}, Indexes = ",
page.CollectionName,
page.DocumentCount,
page.FreeDataPageID.Dump());
foreach (var i in page.GetIndexes(true))
{
sb.AppendFormat("[{0}] Field: '{1}', Head: {2}, FreeIndexPageID: {3} / ",
i.Slot,
i.Field,
i.HeadNode.Dump(),
i.FreeIndexPageID.Dump());
}
}
private void Usage(CollectionPage col,
out int indexPages,
out int indexFree,
out int dataPages,
out int extendPages,
out int dataFree,
out int docSize)
{
var pages = new HashSet <uint>();
indexPages = indexFree = dataPages = extendPages = dataFree = docSize = 0;
// get all pages from PK index + data/extend pages
foreach (var node in _indexer.FindAll(col.PK, Query.Ascending))
{
if (pages.Contains(node.Position.PageID))
{
continue;
}
pages.Add(node.Position.PageID);
indexPages++;
indexFree += node.Page.FreeBytes;
foreach (var n in node.Page.Nodes.Values.Where(x => !x.DataBlock.IsEmpty))
{
var dataPage = _pager.GetPage <DataPage>(n.DataBlock.PageID, false);
if (pages.Contains(dataPage.PageID))
{
continue;
}
foreach (var block in dataPage.DataBlocks.Values)
{
var doc = BsonSerializer.Deserialize(_data.Read(block.Position, true).Buffer);
docSize += doc.GetBytesCount(true);
}
pages.Add(dataPage.PageID);
dataPages++;
dataFree += dataPage.FreeBytes;
// getting extended pages
foreach (var ex in dataPage.DataBlocks.Values.Where(x => x.ExtendPageID != uint.MaxValue))
{
foreach (var extendPage in _pager.GetSeqPages <ExtendPage>(ex.ExtendPageID))
{
extendPages++;
dataFree += extendPage.FreeBytes;
}
}
}
_cache.CheckPoint();
}
// add all others indexes
foreach (var index in col.GetIndexes(false))
{
foreach (var node in _indexer.FindAll(index, Query.Ascending))
{
if (pages.Contains(node.Position.PageID))
{
continue;
}
pages.Add(node.Position.PageID);
indexPages++;
indexFree += node.Page.FreeBytes;
_cache.CheckPoint();
}
}
}
