97 lines
2.0 KiB
C++
97 lines
2.0 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) 2007,
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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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1 QueryExecutor for Distributed-SECONDO
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1.1 Includes
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*/
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#include "heartbeat.h"
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/*
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2.1 Update Heartbeat timestamp
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*/
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bool HeartbeatUpdater::updateHeartbeat() {
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// Build CQL query
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stringstream ss;
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ss << "UPDATE system_state set heartbeat = unixTimestampOf(now()) ";
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ss << "WHERE ip = '";
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ss << cassandraIp;
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ss << "';";
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return executeQuery(ss.str());
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}
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/*
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2.1 Execute a query in cassandra
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*/
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bool HeartbeatUpdater::executeQuery(string query) {
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// Update last executed command
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bool result = cassandra -> executeCQLSync(
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query,
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CASS_CONSISTENCY_ONE
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);
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if(! result) {
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cout << "Unable to update heartbeat in system_state table" << endl;
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cout << "CQL Statement: " << query << endl;
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return false;
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}
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return true;
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}
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/*
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2.1 Main loop - send heartbeat messages all n seconds
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*/
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void HeartbeatUpdater::run() {
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while(active) {
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updateHeartbeat();
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sleep(HEARTBEAT_UPDATE);
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}
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}
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/*
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2.1 Stop the main loop
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*/
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void HeartbeatUpdater::stop() {
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active = false;
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// Disconnect from cassandra
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if(cassandra != NULL) {
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cassandra -> disconnect();
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delete cassandra;
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cassandra = NULL;
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}
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}
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