/**
Copyright (C) SYSTAP, LLC DBA Blazegraph 2006-2016. All rights reserved.
Contact:
SYSTAP, LLC DBA Blazegraph
2501 Calvert ST NW #106
Washington, DC 20008
licenses@blazegraph.com
This program 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; version 2 of the License.
This program 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 this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
/*
* Created on Sep 30, 2010
*/
package com.bigdata.bop.fed;
import org.apache.log4j.Logger;
import com.bigdata.rdf.sparql.ast.eval.AST2BOpContext;
import com.bigdata.rdf.sparql.ast.eval.IExternalAST2BOp;
import com.bigdata.util.ClassPathUtil;
/**
* Singleton factory for a query controller.
*
* @author <a href="mailto:thompsonbry@users.sourceforge.net">Bryan Thompson</a>
*
* @see BLZG-1471 (Convert QueryEngineFactory to use getInstance() and public
* interface for accessor methods.)
*/
public class QueryEngineFactory {
private static final Logger log = Logger.getLogger(QueryEngineFactory.class);
static final IQueryEngineFactory instance;
static {
instance = ClassPathUtil.classForName(//
"com.blazegraph.rdf.gpu.bop.engine.GpuQueryEngineFactory", // preferredClassName,
QueryEngineFactoryBase.class, // defaultClass,
IQueryEngineFactory.class, // sharedInterface,
QueryEngineFactory.class.getClassLoader() // classLoader
);
// instance = new QueryEngineFactoryBase();
if (log.isInfoEnabled())
log.info("Factory class is " + instance.getClass().getName());
}
public static IQueryEngineFactory getInstance() {
return instance;
}
}