/*
* $Header$
* $Revision: 982 $
* $Date: 2006-12-08 18:42:51 +1000 (Fri, 08 Dec 2006) $
*
* ====================================================================
*
* The Apache Software License, Version 1.1
*
* Copyright (c) 2003-2009 The JRDF Project. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
*
* 3. The end-user documentation included with the redistribution, if
* any, must include the following acknowlegement:
* "This product includes software developed by the
* the JRDF Project (http://jrdf.sf.net/)."
* Alternately, this acknowlegement may appear in the software itself,
* if and wherever such third-party acknowlegements normally appear.
*
* 4. The names "The JRDF Project" and "JRDF" must not be used to endorse
* or promote products derived from this software without prior written
* permission. For written permission, please contact
* newmana@users.sourceforge.net.
*
* 5. Products derived from this software may not be called "JRDF"
* nor may "JRDF" appear in their names without prior written
* permission of the JRDF Project.
*
* THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR
* ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
* USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
* OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
* ====================================================================
*
* This software consists of voluntary contributions made by many
* individuals on behalf of the JRDF Project. For more
* information on JRDF, please see <http://jrdf.sourceforge.net/>.
*
*/
package org.jrdf.query.server.distributed;
import org.jrdf.graph.global.MoleculeGraph;
import org.jrdf.query.answer.Answer;
import org.jrdf.query.client.QueryClient;
import org.jrdf.query.client.SparqlAnswerHandler;
import org.jrdf.query.server.GraphApplication;
import org.restlet.resource.ResourceException;
import java.net.URI;
import static java.net.URI.create;
import java.util.HashMap;
import java.util.HashSet;
import java.util.Map;
import java.util.Set;
/**
* @author Yuan-Fang Li
* @version :$
*/
public class DistributedQueryGraphApplicationImpl implements DistributedQueryGraphApplication {
private static final int DEFAULT_PORT = 8182;
private static final int INVALID_TIME_TAKEN = -1;
private final SparqlAnswerHandler handler;
private Set<URI> servers;
private GraphApplication application;
public DistributedQueryGraphApplicationImpl(final GraphApplication newApplication,
final SparqlAnswerHandler newHandler) {
this.handler = newHandler;
this.application = newApplication;
this.servers = new HashSet<URI>();
}
public void addServers(String... newServers) {
for (String server : newServers) {
this.servers.add(create("http://" + server + ":" + DEFAULT_PORT));
}
}
public void removeServers(String... newServers) {
for (String server : newServers) {
this.servers.remove(create("http://" + server + ":" + DEFAULT_PORT));
}
}
public String[] getServers() {
final String[] serverNames = new String[servers.size()];
int i = 0;
for (final URI host : servers) {
serverNames[i++] = host.getHost();
}
return serverNames;
}
public Answer answerQuery(String graphName, String queryString, long maxRows) throws ResourceException {
try {
Set<URI> fullServerNames = new HashSet<URI>();
for (URI server : servers) {
fullServerNames.add(create(server.toString() + "/graph/" + graphName));
}
final QueryClient queryClient = new DistributedQueryClientImpl(fullServerNames, handler);
final Map<String, String> ext = new HashMap<String, String>();
ext.put("maxRows", Long.toString(maxRows));
return queryClient.executeQuery(queryString, ext);
} catch (Exception e) {
throw new ResourceException(e);
}
}
public String getGraphsDir() {
return application.getGraphsDir();
}
public long getMaxRows() {
return application.getMaxRows();
}
public void setMaxRows(long rows) {
application.setMaxRows(rows);
}
public void close() {
application.close();
}
public MoleculeGraph getGraph(String name) {
return application.getGraph(name);
}
public MoleculeGraph getGraph() {
return application.getGraph();
}
public long getTimeTaken() {
return INVALID_TIME_TAKEN;
}
public boolean isTooManyRows() {
return application.isTooManyRows();
}
}