149 lines
3.7 KiB
C++
149 lines
3.7 KiB
C++
/*
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----
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This file is part of SECONDO.
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Copyright (C) 2014, University in Hagen, Faculty of Mathematics and
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Computer Science, 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
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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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Jan Kristof Nidzwetzki
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//paragraph [1] Title: [{\Large \bf \begin{center}] [\end{center}}]
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//paragraph [10] Footnote: [{\footnote{] [}}]
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//[TOC] [\tableofcontents]
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[TOC]
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0 Overview
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The classes, contained in this file, encapsulates a cassandra result
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statement into a CassandraResult object. These objects can be lazy
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evaluated or evaluated in multiple threads.
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1 Includes and defines
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*/
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#ifndef _CASSANDRA_RESULT_H
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#define _CASSANDRA_RESULT_H
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#include <queue>
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#include "CassandraTuplePrefetcher.h"
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#include "CassandraHelper.h"
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#include "CassandraAdapter.h"
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#include "CassandraToken.h"
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using namespace std;
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//namespace to avoid name conflicts
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namespace cassandra {
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// Prototype class
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class CassandraAdapter;
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/*
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2.2 Result object for one cql query
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*/
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class CassandraResult {
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public:
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// Constructor with one query
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CassandraResult(CassSession* mySession, string myStatement,
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CassConsistency myConsistenceLevel, bool myPrintError = true)
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: session(mySession), statement(NULL), future(NULL),
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result(NULL), iterator(NULL), row(NULL), printError(myPrintError) {
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queries.push_back(myStatement);
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setupNextQuery();
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}
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// Constructor with query vector
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CassandraResult(CassSession* mySession, vector<string> myQueries,
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CassConsistency myConsistenceLevel, bool myPrintError = true)
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: session(mySession), statement(NULL), future(NULL),
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result(NULL), iterator(NULL), row(NULL),
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queries(myQueries), printError(myPrintError) {
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setupNextQuery();
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}
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void freeIterator() {
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if(iterator != NULL) {
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cass_iterator_free(iterator);
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iterator = NULL;
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}
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}
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void freeResult() {
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if(result != NULL) {
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cass_result_free(result);
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result = NULL;
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}
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}
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void freeFuture() {
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if(future != NULL) {
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cass_future_free(future);
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future = NULL;
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}
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}
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void freeStatement() {
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if(statement != NULL) {
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cass_statement_free(statement);
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statement = NULL;
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}
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}
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void freeAll() {
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freeIterator();
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freeResult();
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freeFuture();
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freeStatement();
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}
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virtual ~CassandraResult() {
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freeAll();
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}
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virtual bool hasNext();
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virtual void getStringValue(string &resultString, int pos);
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virtual cass_int32_t getIntValue(int pos);
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virtual cass_int64_t getBigIntValue(int pos);
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void setupNextQuery();
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private:
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CassSession* session;
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CassStatement* statement;
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CassFuture* future;
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const CassResult* result;
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CassIterator* iterator;
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const CassRow* row;
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vector<string> queries;
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queue< vector< CassRow*> > results;
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bool printError;
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};
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} // Namespace
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#endif
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