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/*
* Licensed to Elasticsearch under one or more contributor
* license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright
* ownership. Elasticsearch 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.elasticsearch.cluster.routing;
import org.apache.lucene.util.CollectionUtil;
import java.util.Iterator;
import java.util.List;
/**
* This class implements a compilation of {@link ShardIterator}s. Each {@link ShardIterator}
* iterated by this {@link Iterable} represents a group of shards.
* ShardsIterators are always returned in ascending order independently of their order at construction
* time. The incoming iterators are sorted to ensure consistent iteration behavior across Nodes / JVMs.
*/
public class GroupShardsIterator implements Iterable<ShardIterator> {
private final List<ShardIterator> iterators;
/**
* Constructs a enw GroupShardsIterator from the given list.
*/
public GroupShardsIterator(List<ShardIterator> iterators) {
CollectionUtil.timSort(iterators);
this.iterators = iterators;
}
/**
* Returns the total number of shards within all groups
* @return total number of shards
*/
public int totalSize() {
int size = 0;
for (ShardIterator shard : iterators) {
size += shard.size();
}
return size;
}
/**
* Returns the total number of shards plus the number of empty groups
* @return number of shards and empty groups
*/
public int totalSizeWith1ForEmpty() {
int size = 0;
for (ShardIterator shard : iterators) {
int sizeActive = shard.size();
if (sizeActive == 0) {
size += 1;
} else {
size += sizeActive;
}
}
return size;
}
/**
* Return the number of groups
* @return number of groups
*/
public int size() {
return iterators.size();
}
@Override
public Iterator<ShardIterator> iterator() {
return iterators.iterator();
}
}
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