/// <summary>
/// Retrives a container from the cachel
/// </summary>
/// <param name="treeAddress">The address of the container</param>
/// <returns>The container</returns>
private BTreeContainer GetContainerFromCache(BTreeAddress treeAddress)
{
BTreeContainer container = null;
_cache.TryGetValue(treeAddress, out container);
return(container);
}
public BTreeContainer GetTree(BTreeAddress address)
{
BTreeContainer container;
_cache.TryGetValue(address, out container);
return(container);
}
/// <summary>
/// Attempts to insert a row into a btree
/// </summary>
/// <param name="insert">The row to insert</param>
/// <returns>True if successful, otherwise false</returns>
public bool InsertRow(RowInsert insert)
{
if (insert == null)
{
throw new ArgumentNullException(nameof(insert));
}
bool isSuccessful = false;
BTreeContainer container;
BTreeAddress address = insert.Table.BTreeAddress;
if (_cache.ContainsKey(insert.Table.BTreeAddress))
{
if (_cache.TryGetValue(address, out container))
{
isSuccessful = container.TryInsertRow(insert);
}
}
else
{
AddContainerToCache(address);
if (_cache.TryGetValue(address, out container))
{
isSuccessful = container.TryInsertRow(insert);
}
}
return(isSuccessful);
}
public BTreeContainer(BTreeAddress address, TreeDictionary <int, Page> tree, DbStorage storage, TableSchema2 schema, Process process)
{
_tree = tree;
_address = address;
_storage = storage;
_schema = schema;
_process = process;
}
public RowInsert(List <RowValue2> values, TableSchema2 table, Guid?participantId, bool isReferenceInsert, BTreeAddress address)
{
_values = values;
_table = table;
_participantId = participantId;
_xactId = Guid.NewGuid();
SortByBinaryFormat();
_address = address;
}
public RowForm2(string databaseName, string tableName, ColumnSchema[] columns, int databaseId, int tableId)
{
_columns = columns;
_databaseName = databaseName;
_tableName = tableName;
_values = new List <RowValue2>();
SetColumnsForValues();
_address = new BTreeAddress {
DatabaseId = databaseId, TableId = tableId
};
}
/// <summary>
/// Attempts to save the specified B-tree to disk
/// </summary>
/// <param name="address">The specific b-tree to save</param>
/// <returns>True if successful, otherwise false.</returns>
public bool SyncTreeToDisk(BTreeAddress address)
{
bool isSuccessful = false;
BTreeContainer container;
if (_cache.TryGetValue(address, out container))
{
container.SetContainerState(BTreeContainerState.LockedForStorageSync);
isSuccessful = container.SyncToDisk();
container.SetContainerState(BTreeContainerState.Ready);
}
return(isSuccessful);
}
/// <summary>
/// Gets a page with the specified id from the data file on disk
/// </summary>
/// <param name="id">The page to get from disk</param>
/// <returns>A page object</returns>
public Page GetPage(int id, BTreeAddress address)
{
Page page = null;
int lineNumber = _dataDirectory.GetLineNumberForPageId(id);
if (lineNumber != 0)
{
byte[] data = GetBinaryPageDataFromDisk(lineNumber);
page = new Page(data, address);
}
return(page);
}
/// <summary>
/// Returns all rows for the specified table (via tree address)
/// </summary>
/// <param name="treeAddress">The tree's address (dbId, tableId)</param>
/// <returns>All rows for the table</returns>
public List <RowStruct> GetAllRows(BTreeAddress treeAddress)
{
var result = new List <RowStruct>();
Database2 database = _process.GetDatabase2(treeAddress.DatabaseId);
TableSchema2 schema = database.GetTable(treeAddress.TableId).Schema;
if (CacheHasContainer(treeAddress))
{
result.AddRange(GetContainerFromCache(treeAddress).GetAllRows(schema, false));
}
else
{
AddContainerToCache(treeAddress);
result.AddRange(GetContainerFromCache(treeAddress).GetAllRows(schema, false));
}
return(result);
}
/// <summary>
/// Tries to load a container from disk file. If this is a fresh database, will return a new container.
/// </summary>
/// <param name="address">The address of the container to get</param>
/// <returns>A container from disk</returns>
private BTreeContainer GetContainerFromDisk(BTreeAddress address)
{
Database2 db = _process.GetDatabase2(address.DatabaseId);
DbStorage storage = db.Storage;
var tree = new TreeDictionary <int, Page>();
TableSchema2 schema = db.GetTable(address.TableId).Schema;
// get the first page
Page page = storage.GetPage(1, address);
// if this is a brand new table
if (page == null)
{
page = new Page(1, address.TableId, address.DatabaseId, schema, _process);
}
tree.Add(page.Id, page);
return(new BTreeContainer(address, tree, storage, schema, _process));
}
/// <summary>
/// Checks the cache for the specified container
/// </summary>
/// <param name="address">The address of the container</param>
/// <returns>True if the cache has the container, otherwise false</returns>
private bool CacheHasContainer(BTreeAddress address)
{
return(_cache.ContainsKey(address));
}
/// <summary>
/// Adds a container to cache from disk. If this is a new table, will add a new container to the cache.
/// </summary>
/// <param name="address">The address of this btree</param>
private void AddContainerToCache(BTreeAddress address)
{
BTreeContainer container = GetContainerFromDisk(address);
_cache.TryAdd(address, container);
}
/// <summary>
/// Gets a page from disk
/// </summary>
/// <param name="id">The id of the page to get</param>
/// <param name="address">The btree address of the page</param>
/// <returns>The page specified</returns>
public Page GetPage(int id, BTreeAddress address)
{
return(_data.GetPage(id, address));
}
/// <summary>
/// Gets a table based on the specified BTreeAddress
/// </summary>
/// <param name="address">The address of the table</param>
/// <returns>The table</returns>
private Table2 GetTable(BTreeAddress address)
{
return(GetTable(address.DatabaseId, address.TableId));
}
public List <Row2> GetAllRows(BTreeAddress treeAddress)
{
throw new NotImplementedException();
}
public Page(byte[] data, BTreeAddress address) : this(data, address.TableId, address.DatabaseId)
{
}
