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/*
* 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.drill.exec.physical.impl.xsort;
import java.util.concurrent.TimeUnit;
import javax.inject.Named;
import org.apache.drill.exec.exception.SchemaChangeException;
import org.apache.drill.exec.ops.FragmentContext;
import org.apache.drill.exec.record.RecordBatch;
import org.apache.drill.exec.record.VectorAccessible;
import org.apache.drill.exec.record.selection.SelectionVector2;
import org.apache.hadoop.util.IndexedSortable;
import org.apache.hadoop.util.QuickSort;
import com.google.common.base.Preconditions;
import com.google.common.base.Stopwatch;
public abstract class SingleBatchSorterTemplate implements SingleBatchSorter, IndexedSortable{
static final org.slf4j.Logger logger = org.slf4j.LoggerFactory.getLogger(SingleBatchSorterTemplate.class);
private SelectionVector2 vector2;
@Override
public void setup(FragmentContext context, SelectionVector2 vector2, VectorAccessible incoming) throws SchemaChangeException{
Preconditions.checkNotNull(vector2);
this.vector2 = vector2;
try {
doSetup(context, incoming, null);
} catch (IllegalStateException e) {
throw new SchemaChangeException(e);
}
}
@Override
public void sort(SelectionVector2 vector2){
QuickSort qs = new QuickSort();
Stopwatch watch = Stopwatch.createStarted();
if (vector2.getCount() > 0) {
qs.sort(this, 0, vector2.getCount());
}
logger.debug("Took {} us to sort {} records", watch.elapsed(TimeUnit.MICROSECONDS), vector2.getCount());
}
@Override
public void swap(int sv0, int sv1) {
char tmp = vector2.getIndex(sv0);
vector2.setIndex(sv0, vector2.getIndex(sv1));
vector2.setIndex(sv1, tmp);
}
@Override
public int compare(int leftIndex, int rightIndex) {
char sv1 = vector2.getIndex(leftIndex);
char sv2 = vector2.getIndex(rightIndex);
try {
return doEval(sv1, sv2);
} catch (SchemaChangeException e) {
throw new RuntimeException( e );
}
}
public abstract void doSetup(@Named("context") FragmentContext context,
@Named("incoming") VectorAccessible incoming,
@Named("outgoing") RecordBatch outgoing)
throws SchemaChangeException;
public abstract int doEval(@Named("leftIndex") char leftIndex,
@Named("rightIndex") char rightIndex)
throws SchemaChangeException;
}
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