Mercurial > hg > release > thermostat-1.2
view storage/core/src/main/java/com/redhat/thermostat/storage/internal/dao/BaseCountable.java @ 1660:c6ae78b6f3ac
[Thermostat 1.2] Update copyright year to 2015
Reviewed-by: omajid
Review-thread: http://icedtea.classpath.org/pipermail/thermostat/2015-March/013127.html
PR2273
author | Severin Gehwolf <sgehwolf@redhat.com> |
---|---|
date | Wed, 11 Mar 2015 15:07:27 +0100 |
parents | 0f2fbbea20bf |
children |
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/* * Copyright 2012-2015 Red Hat, Inc. * * This file is part of Thermostat. * * Thermostat is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published * by the Free Software Foundation; either version 2, or (at your * option) any later version. * * Thermostat is distributed in the hope that it will be useful, but * WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU * General Public License for more details. * * You should have received a copy of the GNU General Public License * along with Thermostat; see the file COPYING. If not see * <http://www.gnu.org/licenses/>. * * Linking this code with other modules is making a combined work * based on this code. Thus, the terms and conditions of the GNU * General Public License cover the whole combination. * * As a special exception, the copyright holders of this code give * you permission to link this code with independent modules to * produce an executable, regardless of the license terms of these * independent modules, and to copy and distribute the resulting * executable under terms of your choice, provided that you also * meet, for each linked independent module, the terms and conditions * of the license of that module. An independent module is a module * which is not derived from or based on this code. If you modify * this code, you may extend this exception to your version of the * library, but you are not obligated to do so. If you do not wish * to do so, delete this exception statement from your version. */ package com.redhat.thermostat.storage.internal.dao; import java.util.logging.Level; import java.util.logging.Logger; import com.redhat.thermostat.common.utils.LoggingUtils; import com.redhat.thermostat.storage.core.Cursor; import com.redhat.thermostat.storage.core.DescriptorParsingException; import com.redhat.thermostat.storage.core.PreparedStatement; import com.redhat.thermostat.storage.core.StatementDescriptor; import com.redhat.thermostat.storage.core.StatementExecutionException; import com.redhat.thermostat.storage.core.Storage; import com.redhat.thermostat.storage.model.AggregateCount; class BaseCountable { private static final int ERROR_COUNT_RESULT = -1; private static final Logger logger = LoggingUtils.getLogger(BaseCountable.class); /** * Performs an aggregate count query as described by the given descriptor. * * @param desc * The no-free-variables statement descriptor. * @param storage * The storage to use for preparing the descriptor. * * @return -1 if execution failed for some reason, the actual count of the * query results if successful. */ protected long getCount(StatementDescriptor<AggregateCount> desc, Storage storage) { PreparedStatement<AggregateCount> prepared = null; Cursor<AggregateCount> countCursor = null; try { prepared = storage.prepareStatement(desc); countCursor = prepared.executeQuery(); } catch (DescriptorParsingException e) { // should not happen, but if it *does* happen, at least log it logger.log(Level.SEVERE, "Preparing query '" + desc + "' failed!", e); return ERROR_COUNT_RESULT; } catch (StatementExecutionException e) { // should not happen, but if it *does* happen, at least log it logger.log(Level.SEVERE, "Executing query '" + desc + "' failed!", e); return ERROR_COUNT_RESULT; } // there is only one result AggregateCount aggreateResult = countCursor.next(); return aggreateResult.getCount(); } }