251 lines
6.2 KiB
C++
251 lines
6.2 KiB
C++
/*
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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 createSSPStreamSupplier.
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[toc]
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1 Operation createSSPStreamSupplier implementation
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*/
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#include "Algebras/Relation-C++/RelationAlgebra.h"
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#include "QueryProcessor.h"
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#include "ListUtils.h"
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#include "Stream.h"
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#include "Generic/StreamSupplier.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 createSSPStreamSupplier ValueMappings
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1.1.1 ValueMapping for Streams of Tuple
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*/
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int createSSPStreamSupplierTStream_VM(Word* args, Word& result, int message,
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Word& local, Supplier s) {
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Word streamWord(Address(0));
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Tuple* tuple;
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StreamSupplier* stsupplier =
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(StreamSupplier*) local.addr;
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CcString* cchost = (CcString*) args[1].addr;
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CcInt* ccport = (CcInt*) args[2].addr;
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std::string host = cchost->GetValue();
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int port = ccport->GetValue();
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// std::thread stsuThread;
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switch(message)
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{
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case OPEN:
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{
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std::cout << " createSSPStreamSupplier: "
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<< "ValueMapping: OPEN " << "\n";
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qp->Open(args[0].addr);
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// start the handler
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stsupplier = new StreamSupplier(host, port);
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stsupplier->Initialize();
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local.addr = stsupplier;
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return 0;
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}
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case REQUEST:
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{
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std::cout << " createSSPStreamSupplier: "
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<< "ValueMapping: REQUEST " << "\n";
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qp->Request(args[0].addr, streamWord);
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if (qp->Received(args[0].addr)) {
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tuple = static_cast<Tuple*>(streamWord.addr);
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result = tuple;
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// push tuple to the clients
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tuple->IncReference();
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stsupplier->pushTuple(tuple);
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return YIELD;
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} else {
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result.addr = 0;
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return CANCEL;
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}
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}
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case CLOSE:
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{
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LOG << " createSSPStreamSupplier: ValueMapping: CLOSE " << ENDL;
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if (local.addr != 0) {
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local.setAddr(0);
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}
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stsupplier->Shutdown();
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qp->Close(args[0].addr);
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// delete distributeStreamServer;
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local.addr = 0;
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return 0;
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}
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}
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return 0;
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}
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/*
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1.2 Operation createSSPStreamSupplier TypeMapping
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*/
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ListExpr createSSPStreamSupplier_TM(ListExpr args) {
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std::cout << " createSSPStreamSupplier: TypeMapping " << "\n";
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std::cout << " Argument of the Typemapping: " <<nl->ToString(args)<<"\n";
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std::string err = "Stream(Tuple(...)) x string x int expected";
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if(!nl->HasLength(args,3)) {
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return listutils::typeError("three arguments expected");
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}
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if(!nl->HasLength(nl->First(args), 2)) {
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return listutils::typeError(err);
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}
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ListExpr arg1Type = nl->First(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 (stream of Tuple)
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if(!Stream<Tuple>::checkType(arg1Type)) {
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return listutils::typeError(err);
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}
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// Check second argument (hostname)
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if (!nl->HasLength(arg2Type, 2))
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return listutils::typeError(" internal error (hostname) ");
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if (!CcString::checkType(nl->First(arg2Type)))
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return listutils::typeError(" string as hostname is expected");
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// Check third argument (portnumber)
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if (!nl->HasLength(arg3Type, 2))
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return listutils::typeError(" internal error (portnumber) ");
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if(!CcInt::checkType(nl->First(arg3Type)))
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return listutils::typeError(" portnummer not an CcInt ");
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if(!listutils::isNumeric(nl->Second(arg3Type)))
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return listutils::typeError(
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" portnumber can't be converted to numeric "
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);
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if(listutils::getNumValue(nl->Second(arg3Type)) < 0 ||
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listutils::getNumValue(nl->Second(arg3Type)) > 65535 )
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return listutils::typeError(
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" portnumber between 0 and 65535 expected "
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);
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return arg1Type;
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}
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/*
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1.3 Operation createSSPStreamSupplier operator selection array
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*/
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ValueMapping createSSPStreamSupplier[] = {
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createSSPStreamSupplierTStream_VM,
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};
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/*
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1.4 Operation createSSPStreamSupplier operator selection
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*/
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int createSSPStreamSupplier_Select(ListExpr args) {
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return 0;
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}
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/*
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1.5 Operation createSSPStreamSupplier operator specification
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*/
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const std::string createSSPStreamSupplierOpSpec =
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"( ( \"Signature\" \"Syntax\" \"Meaning\" \"Example\" ) "
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"( <text>(stream (tuple([a1:d1, ... ,an:dn])) x string x int)"
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" -> (stream (tuple([a1:d1, ... ,an:dn]))))</text--->"
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"<text>_ createSSPStreamSupplier [ _, _ ]</text--->"
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"<text>Connect a Stream Supplier to a Coordinator "
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" specified by address and portnumber</text--->"
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"<text>query ten feed createSSPStreamSupplier"
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"[\"127.0.0.1\", 12300] consume</text--->"
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") )";
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/*
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1.6 Operation createSSPStreamSupplier
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*/
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Operator createSSPStreamSupplier_Op(
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"createSSPStreamSupplier",
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createSSPStreamSupplierOpSpec,
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1,
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createSSPStreamSupplier,
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createSSPStreamSupplier_Select,
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createSSPStreamSupplier_TM
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);
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} /* end of namespace */
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