//Fire up Fastore, create a host, connect to a session.
protected override void InternalStart(ServerProcess process)
{
base.InternalStart(process);
var addresses = GetAddresses();
//Connect to the Fastore Service
_db = Alphora.Fastore.Client.Client.Connect(addresses);
_generator = new Alphora.Fastore.Client.Generator(_db);
_tables = new FastoreTables();
}
//TODO: FastoreTable? This function is used internally to make sure tables exist
//In the case of Fastore, this means reading the tableVar, deciding what the columns will look like, and creating them.
protected FastoreTable EnsureFastoreTable(Schema.TableVar tableVar)
{
if (!tableVar.IsSessionObject && !tableVar.IsATObject)
{
tableVar.Scope = (Schema.TableVarScope)Enum.Parse(typeof(Schema.TableVarScope), MetaData.GetTag(tableVar.MetaData, "Storage.Scope", "Database"), false);
}
FastoreTables tables = GetTables(tableVar.Scope);
lock (tables)
{
int index = tables.IndexOf(tableVar);
if (index < 0)
{
index = tables.Add(new FastoreTable(ServerProcess.ValueManager, tableVar, this.Device));
}
return(tables[index]);
}
}
//Execute is what actually returns a value? Plan is executed which return a scan.
protected override object InternalExecute(Program program, PlanNode planNode)
{
if (planNode is BaseTableVarNode)
{
FastoreCursor scan = new FastoreCursor(program, _db, (BaseTableVarNode)planNode);
try
{
scan.Open();
return(scan);
}
catch
{
scan.Dispose();
throw;
}
}
else if (planNode is OrderNode)
{
OrderNode orderNode = (OrderNode)planNode;
if (orderNode.Order.Columns.Count == 1)
{
FastoreCursor scan = new FastoreCursor(program, _db, (BaseTableVarNode)planNode.Nodes[0]);
try
{
scan.Key = orderNode.PhysicalOrder;
scan.Direction = orderNode.ScanDirection;
scan.Node.Order = orderNode.Order;
scan.Open();
return(scan);
}
catch
{
scan.Dispose();
throw;
}
}
else
{
FastoreStackedCursor scan = new FastoreStackedCursor(program, _db, orderNode.Order, orderNode.PhysicalOrder, (BaseTableVarNode)planNode.Nodes[0]);
try
{
scan.Open();
return(scan);
}
catch
{
scan.Dispose();
throw;
}
}
}
else if (planNode is CreateTableVarBaseNode)
{
EnsureFastoreTable(((CreateTableVarBaseNode)planNode).GetTableVar());
return(null);
}
else if (planNode is AlterTableNode)
{
// TODO: Memory device alter table support
return(null);
}
else if (planNode is DropTableNode)
{
Schema.TableVar tableVar = ((DropTableNode)planNode).Table;
FastoreTables tables = GetTables(tableVar.Scope);
lock (tables)
{
int tableIndex = tables.IndexOf(tableVar);
if (tableIndex >= 0)
{
FastoreTable nativeTable = tables[tableIndex];
nativeTable.Drop(program.ValueManager);
tables.RemoveAt(tableIndex);
}
}
return(null);
}
else
{
throw new DeviceException(DeviceException.Codes.InvalidExecuteRequest, Device.Name, planNode.ToString());
}
}
