/*
* Copyright 2014, Stratio.
*
* Licensed 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 com.stratio.deep.core.rdd;
import static com.stratio.deep.commons.utils.Utils.getExtractorInstance;
import static com.stratio.deep.core.util.ExtractorClientUtil.getExtractorClient;
import static scala.collection.JavaConversions.asScalaBuffer;
import static scala.collection.JavaConversions.asScalaIterator;
import java.io.Serializable;
import java.util.List;
import org.apache.spark.InterruptibleIterator;
import org.apache.spark.Partition;
import org.apache.spark.SparkContext;
import org.apache.spark.TaskContext;
import org.apache.spark.broadcast.Broadcast;
import org.apache.spark.rdd.RDD;
import com.stratio.deep.commons.config.BaseConfig;
import com.stratio.deep.commons.exception.DeepExtractorInitializationException;
import com.stratio.deep.commons.exception.DeepIOException;
import com.stratio.deep.commons.rdd.IExtractor;
import scala.Function1;
import scala.Unit;
import scala.collection.Iterator;
import scala.collection.Seq;
import scala.reflect.ClassTag$;
import scala.runtime.AbstractFunction1;
import scala.runtime.BoxedUnit;
/**
* Created by rcrespo on 11/08/14.
*/
public class DeepRDD<T, S extends BaseConfig> extends RDD<T> implements Serializable {
private static final long serialVersionUID = -5360986039609466526L;
private transient IExtractor<T, S> extractorClient;
protected Broadcast<S> config;
public Broadcast<S> getConfig() {
return config;
}
public DeepRDD(SparkContext sc, S config) {
super(sc, scala.collection.Seq$.MODULE$.empty(), ClassTag$.MODULE$.<T>apply(config
.getEntityClass()));
config.setRddId(id());
this.config =
sc.broadcast(config, ClassTag$.MODULE$
.<S>apply(config.getClass()));
}
@Override
public Seq<String> getPreferredLocations(Partition split) {
initExtractorClient();
List<String> locations = extractorClient.getPreferredLocations(split);
if (locations == null || locations.isEmpty()) {
return super.getPreferredLocations(split);
}
return asScalaBuffer(locations);
}
@Override
public Iterator<T> compute(Partition split, TaskContext context) {
initExtractorClient();
extractorClient.initIterator(split, config.getValue());
context.addTaskCompletionListener(new AbstractFunction1<TaskContext, BoxedUnit>() {
@Override
public BoxedUnit apply(TaskContext v1) {
extractorClient.close();
return null;
}
});
java.util.Iterator<T> iterator = new java.util.Iterator<T>() {
@Override
public boolean hasNext() {
return extractorClient.hasNext();
}
@Override
public T next() {
return extractorClient.next();
}
@Override
public void remove() {
throw new DeepIOException(
"Method not implemented (and won't be implemented anytime soon!!!)");
}
};
return new InterruptibleIterator<>(context, asScalaIterator(iterator));
}
@Override
public Partition[] getPartitions() {
initExtractorClient();
return extractorClient.getPartitions(config.getValue());
}
/**
* It tries to get an Extractor Instance,
* if there is any problem try to instance an extractorClient
*/
private void initExtractorClient() {
try {
if (extractorClient == null) {
extractorClient = getExtractorInstance(config.getValue());
}
} catch (DeepExtractorInitializationException e) {
extractorClient = getExtractorClient();
}
}
}