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/*
* Copyright Elasticsearch B.V. and/or licensed to Elasticsearch B.V. under one
* or more contributor license agreements. Licensed under the Elastic License
* 2.0 and the Server Side Public License, v 1; you may not use this file except
* in compliance with, at your election, the Elastic License 2.0 or the Server
* Side Public License, v 1.
*/
package org.elasticsearch.cluster.routing;
import java.util.List;
/**
* A shuffler for shards whose primary goal is to balance load.
*/
public abstract class ShardShuffler {
/**
* Return a new seed.
*/
public abstract int nextSeed();
/**
* Return a shuffled view over the list of shards. The behavior of this method must be deterministic: if the same list and the same seed
* are provided twice, then the result needs to be the same.
*/
public abstract List shuffle(List shards, int seed);
/**
* Equivalent to calling shuffle(shards, nextSeed())
.
*/
public List shuffle(List shards) {
return shuffle(shards, nextSeed());
}
}