/// <summary>
/// Adds the database to the Frost system Db directory file
/// </summary>
/// <param name="database">The database object</param>
/// <param name="isOnline">True if the database is online, otherwise false</param>
public void AddDatabaseToDirectory(Database2 database, bool isOnline)
{
// databaseName <bool> isOnline
lock (_fileLock)
{
using (var sw = File.AppendText(_fileName))
{
sw.WriteLine($"{database.Name},{isOnline.ToString()}");
}
}
}
public void AddDatabase2(Database2 database)
{
if (database != null)
{
if (!HasDatabase2(database.Name))
{
_databases2.Add(database);
_storageManager.AddNewDatabase(database);
}
}
else
{
throw new ArgumentNullException(nameof(database));
}
}
public int GetMaxDatabaseId()
{
int result = 0;
Database2 db = Databases2.MaxBy(d => d.DatabaseId).FirstOrDefault();
if (db is null)
{
result = 0;
}
else
{
result = db.DatabaseId;
}
return(result);
}
/// <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>
/// Gets a list of databases from disk
/// </summary>
/// <returns>A list of databases</returns>
public Database2[] GetDatabases()
{
var databases = GetOnlineDatabases();
Database2[] result = new Database2[databases.Length];
int i = 0;
foreach (var db in databases)
{
var storage = new DbStorage(_process, db);
var dbItem = storage.GetDatabase(db);
storage.Initialize();
result[i] = dbItem;
i++;
}
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>
/// Creates the appropriate disk files for a new database hosted by this Frost process
/// </summary>
/// <param name="database"></param>
public void AddNewDatabase(Database2 database)
{
database.Storage.CreateFiles(database.DatabaseId);
_directory.AddDatabaseToDirectory(database, true);
}
