740 lines
26 KiB
C++
740 lines
26 KiB
C++
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/*
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----
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This file is part of SECONDO.
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Copyright (C) 2004, University in Hagen, Department of Computer Science,
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Database Systems for New Applications.
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SECONDO is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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SECONDO is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with SECONDO; if not, write to the Free Software
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Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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----
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//paragraph [1] Title: [{\Large \bf \begin{center}] [\end{center}}]
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//characters [1] Type: [] []
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//characters [2] Type: [] []
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//[ae] [\"{a}]
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//[oe] [\"{o}]
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//[ue] [\"{u}]
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//[ss] [{\ss}]
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//[Ae] [\"{A}]
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//[Oe] [\"{O}]
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//[Ue] [\"{U}]
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//[x] [$\times $]
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//[->] [$\rightarrow $]
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//[toc] [\tableofcontents]
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[1] Implementation of operation foreverStream.
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[toc]
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1 Operation foreverStream implementation
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Produces an optionally never ending stream of tuples of the
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format...
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*/
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#include "Algebras/Relation-C++/RelationAlgebra.h"
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#include "Stream.h"
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#include "QueryProcessor.h"
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#include "ListUtils.h"
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#include "ForeverHelper.h"
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#include "Protocols.h"
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extern NestedList* nl;
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extern QueryProcessor* qp;
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extern AlgebraManager* am;
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namespace continuousqueries {
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/*
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1.1 Operation foreverStream TypeMapping
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*/
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ListExpr foreverStream_TM(ListExpr args) {
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// the list is coded as ( (<type> <query part>) (<type> <query part>) )
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std::cout << "foreverStream: TypeMapping" << endl;
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std::cout << "Argument: " << nl->ToString(args) << endl;
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// Check for int x int -> stream(tuple())
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if (!nl->HasLength(args, 3))
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return listutils::typeError(" three arguments are expected");
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ListExpr arg1Type = nl->First(args);
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ListExpr arg2Type = nl->Second(args);
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ListExpr arg3Type = nl->Third(args);
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// Check first argument (tuple volume)
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if (!nl->HasLength(arg1Type, 2))
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return listutils::typeError(" internal error (tuple volume) ");
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if(!CcInt::checkType(nl->First(arg1Type)))
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return listutils::typeError(" (tuple volume) not an CcInt ");
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if(!listutils::isNumeric(nl->Second(arg1Type)))
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return listutils::typeError(
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" (tuple volume) can't be converted to numeric "
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);
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// Check second argument (tuple type)
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if (!nl->HasLength(arg2Type, 2))
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return listutils::typeError(" internal error (tuple type) ");
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if(!CcInt::checkType(nl->First(arg2Type)))
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return listutils::typeError(" (tuple type) not an CcInt ");
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if(!listutils::isNumeric(nl->Second(arg2Type)))
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return listutils::typeError(
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" (tuple type) can't be converted to numeric "
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);
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// Check third argument (chance of undefined)
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if (!nl->HasLength(arg3Type, 2))
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return listutils::typeError(" internal error (chance of undefined) ");
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if(!CcInt::checkType(nl->First(arg3Type)))
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return listutils::typeError(" (chance of undefined) not an CcInt ");
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if(!listutils::isNumeric(nl->Second(arg3Type)))
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return listutils::typeError(
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" (chance of undefined) can't be converted to numeric "
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);
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if ((listutils::getNumValue(nl->Second(arg3Type)) < -1) ||
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(listutils::getNumValue(nl->Second(arg3Type)) > 100)) {
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return listutils::typeError(
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" (chance of undefined) between -1 and 100 expected "
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);
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}
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// Return Stream based on choosen tuple type
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if (listutils::getNumValue(nl->Second(arg2Type)) == 0)
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return nl->TwoElemList( listutils::basicSymbol<Stream<Tuple>>(),
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nl->TwoElemList( listutils::basicSymbol<Tuple>(),
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nl->TwoElemList(
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nl->TwoElemList( nl->SymbolAtom("I"),
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listutils::basicSymbol<CcInt>()),
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nl->TwoElemList( nl->SymbolAtom("S"),
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listutils::basicSymbol<CcString>())
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)
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)
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);
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if (listutils::getNumValue(nl->Second(arg2Type)) == 1)
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return nl->TwoElemList( listutils::basicSymbol<Stream<Tuple>>(),
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nl->TwoElemList( listutils::basicSymbol<Tuple>(),
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nl->SixElemList(
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nl->TwoElemList( nl->SymbolAtom("Id"),
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listutils::basicSymbol<CcString>()),
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nl->TwoElemList( nl->SymbolAtom("City"),
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listutils::basicSymbol<CcString>()),
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nl->TwoElemList( nl->SymbolAtom("Month"),
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listutils::basicSymbol<CcString>()),
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nl->TwoElemList( nl->SymbolAtom("Number"),
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listutils::basicSymbol<CcInt>()),
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nl->TwoElemList( nl->SymbolAtom("Fraction"),
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listutils::basicSymbol<CcReal>()),
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nl->TwoElemList( nl->SymbolAtom("Valid"),
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listutils::basicSymbol<CcBool>())
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)
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)
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);
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if (listutils::getNumValue(nl->Second(arg2Type)) == 2)
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return nl->TwoElemList( listutils::basicSymbol<Stream<Tuple>>(),
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nl->TwoElemList( listutils::basicSymbol<Tuple>(),
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nl->FourElemList(
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nl->TwoElemList( nl->SymbolAtom("I_eq"),
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listutils::basicSymbol<CcInt>()),
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nl->TwoElemList( nl->SymbolAtom("I_gt"),
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listutils::basicSymbol<CcInt>()),
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nl->TwoElemList( nl->SymbolAtom("I_lt"),
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listutils::basicSymbol<CcInt>()),
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nl->TwoElemList( nl->SymbolAtom("S_eq"),
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listutils::basicSymbol<CcString>())
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)
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)
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);
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if (listutils::getNumValue(nl->Second(arg2Type)) == 3)
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{
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ListExpr res = nl->OneElemList(
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nl->TwoElemList( nl->SymbolAtom("Id_eq"),
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listutils::basicSymbol<CcString>()));
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ListExpr last = res;
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last = nl->Append(last, nl->TwoElemList( nl->SymbolAtom("City_eq"),
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listutils::basicSymbol<CcString>()));
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last = nl->Append(last, nl->TwoElemList( nl->SymbolAtom("Month_eq"),
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listutils::basicSymbol<CcString>()));
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last = nl->Append(last, nl->TwoElemList( nl->SymbolAtom("Number_eq"),
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listutils::basicSymbol<CcInt>()));
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last = nl->Append(last, nl->TwoElemList( nl->SymbolAtom("Number_gt"),
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listutils::basicSymbol<CcInt>()));
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last = nl->Append(last, nl->TwoElemList( nl->SymbolAtom("Number_lt"),
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listutils::basicSymbol<CcInt>()));
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last = nl->Append(last, nl->TwoElemList( nl->SymbolAtom("Fraction_eq"),
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listutils::basicSymbol<CcReal>()));
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last = nl->Append(last, nl->TwoElemList( nl->SymbolAtom("Fraction_gt"),
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listutils::basicSymbol<CcReal>()));
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last = nl->Append(last, nl->TwoElemList( nl->SymbolAtom("Fraction_lt"),
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listutils::basicSymbol<CcReal>()));
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last = nl->Append(last, nl->TwoElemList( nl->SymbolAtom("Valid_eq"),
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listutils::basicSymbol<CcBool>()));
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return nl->TwoElemList( listutils::basicSymbol<Stream<Tuple>>(),
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nl->TwoElemList( listutils::basicSymbol<Tuple>(),
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res
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)
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);
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}
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return listutils::typeError(" (tuple type) between 0 and 3 expected ");
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}
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std::string RelationToString(Relation* rel)
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{
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std::stringstream out;
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int i = 0;
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Tuple* t = 0;
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GenericRelationIterator* it = rel->MakeScan();
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while ((t = it->GetNextTuple()) != 0)
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{
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for(int ii = 0; ii < t->GetNoAttributes(); ii++)
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{
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if (ii>0 || i>0) out << ", ";
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t->GetAttribute(ii)->Print(out);
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}
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t->DeleteIfAllowed();
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t = 0;
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i++;
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}
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delete it;
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it = 0;
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return out.str();
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}
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class foreverStream_LI{
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public:
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foreverStream_LI(int volume, int type, int chanceOfUndefined,
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TupleType* resultTupleType):
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_volume(volume),
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_type(type),
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_chanceOfUndefined(chanceOfUndefined),
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_count(1),
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_resultTupleType(resultTupleType) {}
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~foreverStream_LI()
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{
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_resultTupleType->DeleteIfAllowed();
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}
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Tuple* getNext()
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{
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if (_volume && _count > _volume) return 0;
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Tuple* t = new Tuple(_resultTupleType);
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int v1;
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int v2;
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double d1;
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double d2;
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int queryType;
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if (_type == 0)
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{
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t->PutAttribute(0, new CcInt(
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ForeverHelper::getBool(_chanceOfUndefined),
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ForeverHelper::getInt()));
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t->PutAttribute(1, new CcString(
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ForeverHelper::getBool(_chanceOfUndefined),
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ForeverHelper::getSmallString()));
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} else
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if (_type == 1)
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{
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t->PutAttribute(0, new CcString(
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ForeverHelper::getBool(_chanceOfUndefined),
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ForeverHelper::getUniqueId()));
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t->PutAttribute(1, new CcString(
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ForeverHelper::getBool(_chanceOfUndefined),
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ForeverHelper::getBigString()));
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t->PutAttribute(2, new CcString(
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ForeverHelper::getBool(_chanceOfUndefined),
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ForeverHelper::getSmallString()));
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t->PutAttribute(3, new CcInt(
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ForeverHelper::getBool(_chanceOfUndefined),
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ForeverHelper::getInt()));
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t->PutAttribute(4, new CcReal(
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ForeverHelper::getBool(_chanceOfUndefined),
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ForeverHelper::getDouble()));
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t->PutAttribute(5, new CcBool(
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ForeverHelper::getBool(_chanceOfUndefined),
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ForeverHelper::getBool()));
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} else
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if (_type == 2)
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{
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// There are 9 possible query types with a maximum of 2 ands:
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// I=?, I>?, I<?, S=?
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// I=? and S=?
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// I>? and I<? -- first ? has to be smaller than second -> between
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// I>? and S=?
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// I<? and S=?
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// I>? and I<? and S=?
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// chanceOfUndefined means here: chance for a easy query
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// (where only one attribute is tested).
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if (!ForeverHelper::getBool(_chanceOfUndefined))
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{
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queryType = rand() % 4 + 1;
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} else {
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queryType = 4 + rand() % 5 + 1;
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}
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v1 = ForeverHelper::getInt(98);
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v2 = v1 + ForeverHelper::getInt(100 - v1);
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switch (queryType)
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{
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case 1: // I=?
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t->PutAttribute(0, new CcInt(
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true,
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ForeverHelper::getInt()));
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t->PutAttribute(1, new CcInt(
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false,
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ForeverHelper::getInt()));
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t->PutAttribute(2, new CcInt(
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false,
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ForeverHelper::getInt()));
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t->PutAttribute(3, new CcString(
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false,
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ForeverHelper::getSmallString()));
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break;
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case 2: // I>?
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t->PutAttribute(0, new CcInt(
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false,
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ForeverHelper::getInt()));
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t->PutAttribute(1, new CcInt(
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true,
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ForeverHelper::getInt()));
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t->PutAttribute(2, new CcInt(
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false,
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ForeverHelper::getInt()));
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t->PutAttribute(3, new CcString(
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false,
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ForeverHelper::getSmallString()));
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break;
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case 3: // I<?
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t->PutAttribute(0, new CcInt(
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false,
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ForeverHelper::getInt()));
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t->PutAttribute(1, new CcInt(
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false,
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ForeverHelper::getInt()));
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t->PutAttribute(2, new CcInt(
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true,
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ForeverHelper::getInt()));
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t->PutAttribute(3, new CcString(
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false,
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ForeverHelper::getSmallString()));
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break;
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case 4: // S=?
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t->PutAttribute(0, new CcInt(
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false,
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ForeverHelper::getInt()));
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t->PutAttribute(1, new CcInt(
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false,
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ForeverHelper::getInt()));
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t->PutAttribute(2, new CcInt(
|
||
|
|
false,
|
||
|
|
ForeverHelper::getInt()));
|
||
|
|
t->PutAttribute(3, new CcString(
|
||
|
|
true,
|
||
|
|
ForeverHelper::getSmallString()));
|
||
|
|
break;
|
||
|
|
|
||
|
|
case 5: // I=? and S=?
|
||
|
|
t->PutAttribute(0, new CcInt(
|
||
|
|
true,
|
||
|
|
ForeverHelper::getInt()));
|
||
|
|
t->PutAttribute(1, new CcInt(
|
||
|
|
false,
|
||
|
|
ForeverHelper::getInt()));
|
||
|
|
t->PutAttribute(2, new CcInt(
|
||
|
|
false,
|
||
|
|
ForeverHelper::getInt()));
|
||
|
|
t->PutAttribute(3, new CcString(
|
||
|
|
true,
|
||
|
|
ForeverHelper::getSmallString()));
|
||
|
|
break;
|
||
|
|
|
||
|
|
case 6: // I>? and I<? -- 1st ? smaller than 2nd -> between
|
||
|
|
t->PutAttribute(0, new CcInt(
|
||
|
|
false,
|
||
|
|
ForeverHelper::getInt()));
|
||
|
|
t->PutAttribute(1, new CcInt(
|
||
|
|
true,
|
||
|
|
v1));
|
||
|
|
t->PutAttribute(2, new CcInt(
|
||
|
|
true,
|
||
|
|
v2));
|
||
|
|
t->PutAttribute(3, new CcString(
|
||
|
|
false,
|
||
|
|
ForeverHelper::getSmallString()));
|
||
|
|
break;
|
||
|
|
|
||
|
|
case 7: // I>? and S=?
|
||
|
|
t->PutAttribute(0, new CcInt(
|
||
|
|
false,
|
||
|
|
ForeverHelper::getInt()));
|
||
|
|
t->PutAttribute(1, new CcInt(
|
||
|
|
true,
|
||
|
|
ForeverHelper::getInt()));
|
||
|
|
t->PutAttribute(2, new CcInt(
|
||
|
|
false,
|
||
|
|
ForeverHelper::getInt()));
|
||
|
|
t->PutAttribute(3, new CcString(
|
||
|
|
true,
|
||
|
|
ForeverHelper::getSmallString()));
|
||
|
|
break;
|
||
|
|
|
||
|
|
case 8: // I<? and S=?
|
||
|
|
t->PutAttribute(0, new CcInt(
|
||
|
|
false,
|
||
|
|
ForeverHelper::getInt()));
|
||
|
|
t->PutAttribute(1, new CcInt(
|
||
|
|
false,
|
||
|
|
ForeverHelper::getInt()));
|
||
|
|
t->PutAttribute(2, new CcInt(
|
||
|
|
true,
|
||
|
|
ForeverHelper::getInt()));
|
||
|
|
t->PutAttribute(3, new CcString(
|
||
|
|
true,
|
||
|
|
ForeverHelper::getSmallString()));
|
||
|
|
break;
|
||
|
|
|
||
|
|
case 9: // I>? and I<? and S=?
|
||
|
|
t->PutAttribute(0, new CcInt(
|
||
|
|
false,
|
||
|
|
ForeverHelper::getInt()));
|
||
|
|
t->PutAttribute(1, new CcInt(
|
||
|
|
true,
|
||
|
|
v1));
|
||
|
|
t->PutAttribute(2, new CcInt(
|
||
|
|
true,
|
||
|
|
v2));
|
||
|
|
t->PutAttribute(3, new CcString(
|
||
|
|
true,
|
||
|
|
ForeverHelper::getSmallString()));
|
||
|
|
break;
|
||
|
|
|
||
|
|
default:
|
||
|
|
break;
|
||
|
|
}
|
||
|
|
|
||
|
|
} else
|
||
|
|
|
||
|
|
if (_type == 3)
|
||
|
|
{
|
||
|
|
bool choosen[10] = {false, false, false, false, false,
|
||
|
|
false, false, false, false, false};
|
||
|
|
|
||
|
|
if (_chanceOfUndefined == -1)
|
||
|
|
{
|
||
|
|
for(size_t i = 0; i < 10; i++)
|
||
|
|
{
|
||
|
|
choosen[i] = true;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
v1 = ForeverHelper::getInt();
|
||
|
|
v2 = ForeverHelper::getInt();
|
||
|
|
d1 = ForeverHelper::getDouble();
|
||
|
|
d2 = ForeverHelper::getDouble();
|
||
|
|
|
||
|
|
if ((_chanceOfUndefined == -1) ||
|
||
|
|
(!ForeverHelper::getBool(_chanceOfUndefined)))
|
||
|
|
{ // test one attribute
|
||
|
|
choosen[rand() % 10] = true;
|
||
|
|
} else {
|
||
|
|
queryType = ForeverHelper::getInt(53);
|
||
|
|
|
||
|
|
if (queryType > 420) // test two attributes
|
||
|
|
{
|
||
|
|
bool invalid;
|
||
|
|
int test1;
|
||
|
|
int test2;
|
||
|
|
do {
|
||
|
|
invalid = false;
|
||
|
|
test1 = rand() % 10;
|
||
|
|
test2 = rand() % 10;
|
||
|
|
|
||
|
|
if (test1 == test2) invalid = true;
|
||
|
|
if ((test1 == 3 && (test2 == 4 || test2 == 5)) ||
|
||
|
|
(test2 == 3 && (test1 == 4 || test1 == 5))) {
|
||
|
|
invalid = true;
|
||
|
|
}
|
||
|
|
if ((test1 == 6 && (test2 == 7 || test2 == 8)) ||
|
||
|
|
(test2 == 6 && (test1 == 7 || test1 == 8))) {
|
||
|
|
invalid = true;
|
||
|
|
}
|
||
|
|
} while (invalid);
|
||
|
|
|
||
|
|
if ((test1==4 && test2==5) || (test1==5 && test2==4)) {
|
||
|
|
v1 = ForeverHelper::getInt(98);
|
||
|
|
v2 = v1 + ForeverHelper::getInt(100 - v1);
|
||
|
|
}
|
||
|
|
|
||
|
|
if ((test1==7 && test2==8) || (test1==8 && test2==7)) {
|
||
|
|
d1 = ForeverHelper::getDouble(5);
|
||
|
|
d2 = ForeverHelper::getDouble(5) + d1;
|
||
|
|
}
|
||
|
|
|
||
|
|
choosen[test1] = true;
|
||
|
|
choosen[test2] = true;
|
||
|
|
} else { // test three attributes
|
||
|
|
bool invalid;
|
||
|
|
int test1;
|
||
|
|
int test2;
|
||
|
|
int test3;
|
||
|
|
|
||
|
|
do {
|
||
|
|
invalid = false;
|
||
|
|
test1 = rand() % 10;
|
||
|
|
test2 = rand() % 10;
|
||
|
|
test3 = rand() % 10;
|
||
|
|
|
||
|
|
if (test1 == test2) invalid = true;
|
||
|
|
if (test2 == test3) invalid = true;
|
||
|
|
if (test3 == test1) invalid = true;
|
||
|
|
|
||
|
|
if ((test1 == 3 && (test2 == 4 || test2 == 5 ||
|
||
|
|
test3 == 4 || test3 == 5)) ||
|
||
|
|
(test2 == 3 && (test1 == 4 || test1 == 5 ||
|
||
|
|
test3 == 4 || test3 == 5)) ||
|
||
|
|
(test3 == 3 && (test1 == 4 || test1 == 5 ||
|
||
|
|
test2 == 4 || test2 == 5))) {
|
||
|
|
invalid = true;
|
||
|
|
}
|
||
|
|
|
||
|
|
if ((test1 == 6 && (test2 == 7 || test2 == 8 ||
|
||
|
|
test3 == 7 || test3 == 8)) ||
|
||
|
|
(test2 == 6 && (test1 == 7 || test1 == 8 ||
|
||
|
|
test3 == 7 || test3 == 8)) ||
|
||
|
|
(test3 == 6 && (test1 == 7 || test1 == 8 ||
|
||
|
|
test2 == 7 || test2 == 8))) {
|
||
|
|
invalid = true;
|
||
|
|
}
|
||
|
|
} while (invalid);
|
||
|
|
|
||
|
|
if (((test1==4 && test2==5) || (test1==5 && test2==4)) ||
|
||
|
|
((test1==4 && test3==5) || (test1==5 && test3==4)) ||
|
||
|
|
((test2==4 && test3==5) || (test2==5 && test3==4)))
|
||
|
|
{
|
||
|
|
v1 = ForeverHelper::getInt(98);
|
||
|
|
v2 = v1 + ForeverHelper::getInt(100 - v1);
|
||
|
|
}
|
||
|
|
|
||
|
|
if (((test1==7 && test2==8) || (test1==8 && test2==7)) ||
|
||
|
|
((test1==7 && test3==8) || (test1==8 && test3==7)) ||
|
||
|
|
((test2==7 && test3==8) || (test2==8 && test3==7)))
|
||
|
|
{
|
||
|
|
d1 = ForeverHelper::getDouble(5);
|
||
|
|
d2 = ForeverHelper::getDouble(5) + d1;
|
||
|
|
}
|
||
|
|
|
||
|
|
choosen[test1] = true;
|
||
|
|
choosen[test2] = true;
|
||
|
|
choosen[test3] = true;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
t->PutAttribute(0, new CcString( // ID_eq
|
||
|
|
choosen[0],
|
||
|
|
ForeverHelper::getUniqueId()));
|
||
|
|
t->PutAttribute(1, new CcString( // City_eq
|
||
|
|
choosen[1],
|
||
|
|
ForeverHelper::getBigString()));
|
||
|
|
t->PutAttribute(2, new CcString( // Month_eq
|
||
|
|
choosen[2],
|
||
|
|
ForeverHelper::getSmallString()));
|
||
|
|
t->PutAttribute(3, new CcInt( // Number_eq
|
||
|
|
choosen[3],
|
||
|
|
ForeverHelper::getInt()));
|
||
|
|
t->PutAttribute(4, new CcInt( // Number_gt
|
||
|
|
choosen[4],
|
||
|
|
v1));
|
||
|
|
t->PutAttribute(5, new CcInt( // Number_lt
|
||
|
|
choosen[5],
|
||
|
|
v2));
|
||
|
|
t->PutAttribute(6, new CcReal( // Fraction_eq
|
||
|
|
choosen[6],
|
||
|
|
ForeverHelper::getDouble()));
|
||
|
|
t->PutAttribute(7, new CcReal( // Fraction_gt
|
||
|
|
choosen[7],
|
||
|
|
d1));
|
||
|
|
t->PutAttribute(8, new CcReal( // Fraction_lt
|
||
|
|
choosen[8],
|
||
|
|
d2));
|
||
|
|
t->PutAttribute(9, new CcBool( // Valid_eq
|
||
|
|
choosen[9],
|
||
|
|
ForeverHelper::getBool()));
|
||
|
|
|
||
|
|
}
|
||
|
|
|
||
|
|
if (_volume) _count++;
|
||
|
|
|
||
|
|
return t;
|
||
|
|
}
|
||
|
|
|
||
|
|
private:
|
||
|
|
int _volume;
|
||
|
|
int _type;
|
||
|
|
int _chanceOfUndefined;
|
||
|
|
int _count;
|
||
|
|
TupleType* _resultTupleType;
|
||
|
|
};
|
||
|
|
|
||
|
|
/*
|
||
|
|
1.2 Operation foreverStream ValueMappings
|
||
|
|
|
||
|
|
*/
|
||
|
|
int foreverStream_VM( Word* args, Word& result, int message,
|
||
|
|
Word& local, Supplier s )
|
||
|
|
{
|
||
|
|
foreverStream_LI* li = (foreverStream_LI*) local.addr;
|
||
|
|
|
||
|
|
ListExpr resultType;
|
||
|
|
TupleType* resultTupleType;
|
||
|
|
|
||
|
|
switch (message) {
|
||
|
|
case OPEN :
|
||
|
|
std::cout << "foreverStream: ValueMapping: OPEN" << endl;
|
||
|
|
std::cout << "Creating an optionally never ending stream." << endl;
|
||
|
|
std::cout << "Volume: " << ((CcInt*) args[0].addr)->GetValue() << " | "
|
||
|
|
<< "Type: " << ((CcInt*) args[1].addr)->GetValue() << " | "
|
||
|
|
<< "Chance of Undefined: "
|
||
|
|
<< ((CcInt*) args[2].addr)->GetValue() << "%" << endl;
|
||
|
|
|
||
|
|
if (li) {
|
||
|
|
delete li;
|
||
|
|
}
|
||
|
|
|
||
|
|
resultType = GetTupleResultType( s );
|
||
|
|
resultTupleType = new TupleType( nl->Second( resultType ) );
|
||
|
|
|
||
|
|
local.addr = new foreverStream_LI(
|
||
|
|
((CcInt*) args[0].addr)->GetValue(),
|
||
|
|
((CcInt*) args[1].addr)->GetValue(),
|
||
|
|
((CcInt*) args[2].addr)->GetValue(),
|
||
|
|
resultTupleType
|
||
|
|
);
|
||
|
|
|
||
|
|
return 0;
|
||
|
|
|
||
|
|
case REQUEST:
|
||
|
|
std::cout << "foreverStream: ValueMapping: REQUEST" << endl;
|
||
|
|
|
||
|
|
result.addr = li ? li->getNext() : 0;
|
||
|
|
return result.addr ? YIELD : CANCEL;
|
||
|
|
|
||
|
|
case CLOSE:
|
||
|
|
std::cout << "foreverStream: ValueMapping: CLOSE" << endl;
|
||
|
|
|
||
|
|
if(li) {
|
||
|
|
delete li;
|
||
|
|
local.addr = 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
// if (resultTupleType) resultTupleType->DeleteIfAllowed();
|
||
|
|
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
/*
|
||
|
|
1.3 Operation foreverStream operator selection array
|
||
|
|
|
||
|
|
*/
|
||
|
|
|
||
|
|
ValueMapping foreverStream[] = {
|
||
|
|
foreverStream_VM
|
||
|
|
};
|
||
|
|
|
||
|
|
/*
|
||
|
|
1.4 Operation foreverStream operator selection
|
||
|
|
|
||
|
|
*/
|
||
|
|
|
||
|
|
int foreverStream_Select(ListExpr args) {
|
||
|
|
return 0;
|
||
|
|
|
||
|
|
// if (listutils::isTupleStream(nl->First(args)))
|
||
|
|
// return 0;
|
||
|
|
// if (VTHelpers::IsVTupleStream(nl->First(args)))
|
||
|
|
// return 1;
|
||
|
|
// return -1;
|
||
|
|
}
|
||
|
|
|
||
|
|
/*
|
||
|
|
1.5 Operation foreverStream operator specification
|
||
|
|
|
||
|
|
*/
|
||
|
|
|
||
|
|
const std::string foreverStreamOpSpec =
|
||
|
|
"( ( \"Signature\" \"Syntax\" \"Meaning\" \"Example\" ) "
|
||
|
|
"( <text>int x int x int -> stream(tuple)</text--->"
|
||
|
|
"<text>foreverStream ( _, _, _ )</text--->"
|
||
|
|
"<text>Creates an (optionally) never ending stream"
|
||
|
|
" of tuples. Two tuple variants implemented.</text--->"
|
||
|
|
"<text>query foreverStream(100, 0, 0) count"
|
||
|
|
"</text--->"
|
||
|
|
") )";
|
||
|
|
|
||
|
|
|
||
|
|
/*
|
||
|
|
1.6 Operation foreverStream
|
||
|
|
|
||
|
|
*/
|
||
|
|
|
||
|
|
Operator foreverStream_Op(
|
||
|
|
"foreverStream",
|
||
|
|
foreverStreamOpSpec,
|
||
|
|
1,
|
||
|
|
foreverStream,
|
||
|
|
foreverStream_Select,
|
||
|
|
foreverStream_TM
|
||
|
|
);
|
||
|
|
|
||
|
|
} /* end of namespace */
|