/// <summary>
/// Create a new index and returns head page address (skip list)
/// </summary>
public CollectionIndex CreateIndex(string name, string expr, bool unique)
{
// get how many butes needed fore each head/tail (both has same size)
var bytesLength = IndexNode.GetNodeLength(MAX_LEVEL_LENGTH, BsonValue.MinValue, out var keyLength);
// get a new empty page (each index contains your own linked nodes)
var indexPage = _snapshot.NewPage <IndexPage>();
// create index ref
var index = _snapshot.CollectionPage.InsertCollectionIndex(name, expr, unique);
// insert head/tail nodes
var head = indexPage.InsertIndexNode(index.Slot, MAX_LEVEL_LENGTH, BsonValue.MinValue, PageAddress.Empty, bytesLength);
var tail = indexPage.InsertIndexNode(index.Slot, MAX_LEVEL_LENGTH, BsonValue.MaxValue, PageAddress.Empty, bytesLength);
// link head-to-tail with double link list in first level
head.SetNext(0, tail.Position);
tail.SetPrev(0, head.Position);
// add this new page in free list (slot 0)
index.FreeIndexPageList = indexPage.PageID;
indexPage.PageListSlot = 0;
index.Head = head.Position;
index.Tail = tail.Position;
return(index);
}
/// <summary>
/// Add a new collection. Check if name the not exists. Create only in transaction page - will update header only in commit
/// </summary>
private void Add(string name, ref CollectionPage collectionPage)
{
if (Encoding.UTF8.GetByteCount(name) > _header.GetAvaiableCollectionSpace())
{
throw LiteException.InvalidCollectionName(name, "There is no space in header for more collections");
}
if (!name.IsWord())
{
throw LiteException.InvalidCollectionName(name, "Use only [a-Z$_]");
}
if (name.StartsWith("$"))
{
throw LiteException.InvalidCollectionName(name, "Collection can't starts with `$` (reserved for system collections)");
}
// create new collection page
collectionPage = _snapshot.NewPage <CollectionPage>();
var pageID = collectionPage.PageID;
// insert collection name/pageID in header only in commit operation
_transPages.Commit += (h) => h.InsertCollection(name, pageID);
// create first index (_id pk) (must pass collectionPage because snapshot contains null in CollectionPage prop)
var indexer = new IndexService(_snapshot);
indexer.CreateIndex("_id", "$._id", true);
}
/// <summary>
/// Add a new collection. Check if name the not exists. Create only in transaction page - will update header only in commit
/// </summary>
private void Add(string name, ref CollectionPage collectionPage)
{
// checks for collection name/size
CheckName(name, _header);
// create new collection page
collectionPage = _snapshot.NewPage <CollectionPage>();
var pageID = collectionPage.PageID;
// insert collection name/pageID in header only in commit operation
_transPages.Commit += (h) => h.InsertCollection(name, pageID);
// create first index (_id pk) (must pass collectionPage because snapshot contains null in CollectionPage prop)
var indexer = new IndexService(_snapshot);
indexer.CreateIndex("_id", "$._id", true);
}
/// <summary>
/// Add a new collection. Check if name the not exists. Create only in transaction page - will update header only in commit
/// </summary>
private async Task <CollectionPage> Add(string name)
{
// checks for collection name/size
CheckName(name, _header);
// create new collection page
var collectionPage = await _snapshot.NewPage <CollectionPage>();
_snapshot.CollectionPage = collectionPage;
var pageID = collectionPage.PageID;
// insert collection name/pageID in header only in commit operation
_transPages.Commit += (h) => h.InsertCollection(name, pageID);
// create first index (_id pk) (must pass collectionPage because snapshot contains null in CollectionPage prop)
var indexer = new IndexService(_snapshot, _header.Pragmas.Collation);
await indexer.CreateIndex("_id", "$._id", true);
return(collectionPage);
}
