160 lines
3.4 KiB
C++
160 lines
3.4 KiB
C++
/*
|
|
----
|
|
This file is part of SECONDO.
|
|
|
|
Copyright (C) 2015,
|
|
Faculty of Mathematics and Computer Science,
|
|
Database Systems for New Applications.
|
|
|
|
SECONDO is free software; you can redistribute it and/or modify
|
|
it under the terms of the GNU General Public License as published by
|
|
the Free Software Foundation; either version 2 of the License, or
|
|
(at your option) any later version.
|
|
|
|
SECONDO is distributed in the hope that it will be useful,
|
|
but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
GNU General Public License for more details.
|
|
|
|
You should have received a copy of the GNU General Public License
|
|
along with SECONDO; if not, write to the Free Software
|
|
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
|
|
----
|
|
|
|
|
|
//[$][\$]
|
|
|
|
*/
|
|
|
|
#ifndef DIST2HELPER
|
|
#define DIST2HELPER
|
|
|
|
|
|
#include "SecondoSMI.h"
|
|
#include "SecondoInterfaceCS.h"
|
|
#include "frel.h"
|
|
#include "StringUtils.h"
|
|
#include "Algebras/Relation-C++/RelationAlgebra.h"
|
|
|
|
namespace distributed2{
|
|
|
|
/*
|
|
|
|
1.1 ~readVar~
|
|
|
|
Using this function, objects stored in a single block of memory
|
|
can be read from a SmiRecord.
|
|
|
|
*/
|
|
|
|
template<class T>
|
|
bool readVar(T& value, SmiRecord& record, size_t& offset){
|
|
bool res = record.Read(&value, sizeof(T), offset) == sizeof(T);
|
|
offset += sizeof(T);
|
|
return res;
|
|
}
|
|
|
|
|
|
/*
|
|
1.2 ~readVar~
|
|
|
|
Using this variant of readVar, a string can be read from an
|
|
SmiRecord.
|
|
|
|
*/
|
|
template<>
|
|
bool readVar<std::string>(std::string& value,
|
|
SmiRecord& record, size_t& offset);
|
|
|
|
/*
|
|
1.3 writeVar
|
|
|
|
This function writes an object cosisting of a single block of
|
|
memory into an SmiRecord.
|
|
|
|
*/
|
|
|
|
template<class T>
|
|
bool writeVar(const T& value, SmiRecord& record, size_t& offset){
|
|
bool res = record.Write(&value, sizeof(T), offset) == sizeof(T);
|
|
offset += sizeof(T);
|
|
return res;
|
|
}
|
|
|
|
/*
|
|
1.4 writeVar
|
|
|
|
This variant of ~writeVar~ write a string into an SmiRecord.
|
|
|
|
*/
|
|
|
|
template<>
|
|
bool writeVar<std::string>(
|
|
const std::string& value, SmiRecord& record, size_t& offset);
|
|
|
|
void showCommand(SecondoInterfaceCS* src,
|
|
const std::string& host,
|
|
const int port,
|
|
const std::string& cmd,
|
|
bool start,
|
|
bool showCommands);
|
|
|
|
/*
|
|
Some Helper functions.
|
|
|
|
*/
|
|
|
|
std::string getUDRelType(ListExpr r);
|
|
|
|
/*
|
|
1.0.1 ~rewriteQuery~
|
|
|
|
This function replaces occurences of [$]<Ident> within the string orig
|
|
by corresponding const expressions. If one Ident does not represent
|
|
a valid object name, the result will be false and the string is
|
|
unchanged.
|
|
|
|
*/
|
|
|
|
std::string rewriteRelType(ListExpr relType);
|
|
|
|
/*
|
|
The next function returns a constant expression for an
|
|
database object.
|
|
|
|
*/
|
|
|
|
bool getConstEx(const std::string& objName, std::string& result);
|
|
|
|
|
|
template<class T>
|
|
void print(std::vector<T>& v, std::ostream& out);
|
|
|
|
|
|
|
|
/*
|
|
rewrites a query. Replaces dollar signs by numbers.
|
|
|
|
*/
|
|
bool rewriteQuery(const std::string& orig, std::string& result);
|
|
|
|
/*
|
|
Function ~isWorkerRelDesc~
|
|
|
|
This function checks wether a relation is a valid description of
|
|
a set of workers. It returns true if it is so , false otherwise.
|
|
If the list is correct, the result parameter will be a list
|
|
with three arguments containing the postions of the attributes
|
|
~Host~, ~Port~, and ~Config~. In the false case, the errMsg
|
|
parameter will contain an error message.
|
|
|
|
*/
|
|
|
|
bool isWorkerRelDesc(ListExpr rel, ListExpr& positions, ListExpr& types,
|
|
std::string& errMsg);
|
|
|
|
}
|
|
|
|
#endif
|
|
|