114 lines
3.3 KiB
C++
114 lines
3.3 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) 2015,
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Faculty of Mathematics and 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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*/
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#include "ConsoleConsumerOperator.h"
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#include "Attribute.h" // implementation of attribute types
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#include "NestedList.h" // required at many places
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#include "Operator.h" // for operator creation
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#include "ListUtils.h" // useful functions for nested lists
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#include "Stream.h" // wrapper for secondo streams
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#include "Algebras/Relation-C++/RelationAlgebra.h" // use of tuples
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#include "log.hpp"
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#include <stack>
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namespace kafka {
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ListExpr consoleConsumerTM(ListExpr args) {
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if (!nl->HasLength(args, 1)) {
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return listutils::typeError(" wrong number of args ");
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}
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if (!Stream<Tuple>::checkType(nl->First(args))) {
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return listutils::typeError(" stream expected ");
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}
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return nl->First(args);
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}
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class ConsoleConsumerLI {
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public :
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ConsoleConsumerLI(Word streamParam) : stream(streamParam) {
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stream.open();
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}
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~ ConsoleConsumerLI() {
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stream.close();
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}
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Tuple *getNext() {
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Tuple *k = stream.request();
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if (k)
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k->Print(cout);
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return k;
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}
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private :
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Stream<Tuple> stream;
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};
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int consoleConsumerVM(Word *args, Word &result, int message,
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Word &local, Supplier s) {
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ConsoleConsumerLI *li = (ConsoleConsumerLI *) local.addr;
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switch (message) {
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case OPEN :
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if (li) {
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delete li;
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}
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local.addr = new ConsoleConsumerLI(args[0]);
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return 0;
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case REQUEST :
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result.addr = li ? li->getNext() : 0;
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return result.addr ? YIELD : CANCEL;
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case CLOSE :
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LOG(DEBUG) << "consoleConsumerVM closing";
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if (li) {
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delete li;
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local.addr = 0;
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}
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LOG(DEBUG) << "consoleConsumerVM closed";
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return 0;
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}
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return 0;
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}
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OperatorSpec consoleConsumerSpec(
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"stream(Tuple) -> stream(Tuple) ",
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"_ consoleConsumer ",
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"All tuples in the stream are written to the output "
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"and to the console.",
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"query plz feed consoleConsumer count"
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);
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Operator consoleConsumerOp(
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"consoleConsumer",
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consoleConsumerSpec.getStr(),
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consoleConsumerVM,
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Operator::SimpleSelect,
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consoleConsumerTM
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);
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}
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