/**
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance
* with the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.apache.jena.tdbloader4;
import java.io.IOException;
import org.apache.hadoop.filecache.DistributedCache;
import org.apache.hadoop.fs.Path;
import org.apache.hadoop.io.LongWritable;
import org.apache.hadoop.io.NullWritable;
import org.apache.hadoop.io.Text;
import org.apache.hadoop.mapreduce.Mapper;
import org.apache.jena.tdbloader4.io.QuadWritable;
import org.apache.jena.tdbloader4.io.SinkQuadMapReduce;
import org.openjena.atlas.event.Event;
import org.openjena.atlas.event.EventManager;
import org.openjena.atlas.lib.Sink;
import org.openjena.riot.pipeline.inf.InfFactory;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import com.hp.hpl.jena.rdf.model.Model;
import com.hp.hpl.jena.rdf.model.ModelFactory;
import com.hp.hpl.jena.sparql.core.Quad;
import com.hp.hpl.jena.util.FileManager;
public class InferMapper extends Mapper<LongWritable, QuadWritable, Text, NullWritable> {
private static final Logger log = LoggerFactory.getLogger(InferMapper.class);
private Counters counters;
private Sink<Quad> sink;
@Override
protected void setup(Context context) throws IOException, InterruptedException {
counters = new Counters(context);
Model vocabulary = ModelFactory.createDefaultModel();
Path[] files = DistributedCache.getLocalCacheFiles(context.getConfiguration());
for ( Path file : files ) {
log.debug("Loading {} ...", file.toString());
FileManager.get().readModel(vocabulary, file.toString());
}
sink = InfFactory.infQuads(new SinkQuadMapReduce(context), vocabulary);
};
@Override
public void map (LongWritable key, QuadWritable value, Context context) throws IOException, InterruptedException {
log.debug("< ({}, {})", key, value);
Quad quad = value.getQuad();
if ( quad.isTriple() ) {
EventManager.send(counters, new Event(Constants.eventQuad, null));
} else {
EventManager.send(counters, new Event(Constants.eventTriple, null));
}
sink.send(quad);
}
@Override
protected void cleanup(Context context) throws IOException, InterruptedException {
counters.close();
}
}