org.apache.hadoop.util.IndexedSorter Maven / Gradle / Ivy
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* to you under the Apache License, Version 2.0 (the
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*
* http://www.apache.org/licenses/LICENSE-2.0
*
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*/
package org.apache.hadoop.util;
import org.apache.hadoop.classification.InterfaceAudience;
import org.apache.hadoop.classification.InterfaceStability;
/**
* Interface for sort algorithms accepting {@link IndexedSortable} items.
*
* A sort algorithm implementing this interface may only
* {@link IndexedSortable#compare} and {@link IndexedSortable#swap} items
* for a range of indices to effect a sort across that range.
*/
@InterfaceAudience.LimitedPrivate({"MapReduce"})
@InterfaceStability.Unstable
public interface IndexedSorter {
/**
* Sort the items accessed through the given IndexedSortable over the given
* range of logical indices. From the perspective of the sort algorithm,
* each index between l (inclusive) and r (exclusive) is an addressable
* entry.
* @see IndexedSortable#compare
* @see IndexedSortable#swap
*/
void sort(IndexedSortable s, int l, int r);
/**
* Same as {@link #sort(IndexedSortable,int,int)}, but indicate progress
* periodically.
* @see #sort(IndexedSortable,int,int)
*/
void sort(IndexedSortable s, int l, int r, Progressable rep);
}