/**
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
*/
/**
*
* This servlet implements a proxy pattern to allow for separation of the
* bigdata-gpu package.
*
*/
package com.bigdata.rdf.sail.webapp;
import java.io.IOException;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.apache.log4j.Logger;
import com.bigdata.util.ClassPathUtil;
public class MapgraphServletProxy extends BigdataRDFServlet {
private static final String DEFAULT_PROVIDER = "com.blazegraph.gpu.webapp.MapgraphServlet";
static private final transient Logger log = Logger.getLogger(MapgraphServletProxy.class);
/**
* Flag to signify a mapgraph operation.
*/
public static final transient String ATTR_MAPGRAPH = "mapgraph";
/**
*
*/
private static final long serialVersionUID = 1L;
/**
* Set to true when the first warning has been logged.
*/
private static boolean hasWarnedGpu = false;
public void doPostRequest(HttpServletRequest req, HttpServletResponse resp) throws IOException
{
//The workbench makes this call even in non-GPU mode.
//throw new RuntimeException("Running without the Mapgraph package.");
if( !hasWarnedGpu ) {
log.warn("Running without GPU Acceleration. See https://www.blazegraph.com/product/gpu-accelerated/.");
hasWarnedGpu = true;
}
resp.sendError(HTTP_NOTIMPLEMENTED /* not implemented */);
}
public static String getDefaultProvider() {
return DEFAULT_PROVIDER;
}
/**
* Factory pattern for a servlet that is discovered at runtime. Either the
* real servlet or its base class (the proxy servlet) will be returned by
* the factory. This is used by the {@link RESTServlet} to discover,
* initialize, delegate, and destroy such servlets using a runtime discovery
* pattern.
*
* @author beebs
* @author bryan
*/
public static class MapgraphServletFactory {
public MapgraphServletProxy getInstance() {
return getInstance(DEFAULT_PROVIDER);
}
public MapgraphServletProxy getInstance(final String provider) {
return ClassPathUtil.classForName(//
provider, // preferredClassName,
MapgraphServletProxy.class, // defaultClass,
MapgraphServletProxy.class, // sharedInterface,
getClass().getClassLoader() // classLoader
);
// try {
// final Class<?> c = Class.forName(provider);
// final Constructor<?> cons = c.getConstructor();
// final Object object = cons.newInstance();
// final MapgraphServletProxy proxy = (MapgraphServletProxy) object;
// return proxy;
// } catch (ClassNotFoundException | NoSuchMethodException
// | SecurityException | InstantiationException
// | IllegalAccessException | IllegalArgumentException
// | InvocationTargetException e) {
// if (log.isDebugEnabled()) {
// log.debug(e.toString());
// }
// //If we're running without the mapgraph package, just return a proxy.
// return new MapgraphServletProxy();
//
// }
}
}
}