/*
* Licensed to ElasticSearch and Shay Banon 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.index.deletionpolicy;
import org.apache.lucene.index.IndexCommit;
import org.apache.lucene.index.IndexDeletionPolicy;
import org.elasticsearch.common.inject.Inject;
import org.elasticsearch.common.settings.Settings;
import org.elasticsearch.index.settings.IndexSettings;
import org.elasticsearch.index.shard.AbstractIndexShardComponent;
import org.elasticsearch.index.shard.ShardId;
import java.util.List;
/**
* This {@link org.apache.lucene.index.IndexDeletionPolicy} implementation that
* keeps only the most recent commit and immediately removes
* all prior commits after a new commit is done. This is
* the default deletion policy.
*/
public class KeepOnlyLastDeletionPolicy extends AbstractIndexShardComponent implements IndexDeletionPolicy {
@Inject
public KeepOnlyLastDeletionPolicy(ShardId shardId, @IndexSettings Settings indexSettings) {
super(shardId, indexSettings);
logger.debug("Using [keep_only_last] deletion policy");
}
/**
* Deletes all commits except the most recent one.
*/
public void onInit(List<? extends IndexCommit> commits) {
// Note that commits.size() should normally be 1:
onCommit(commits);
}
/**
* Deletes all commits except the most recent one.
*/
public void onCommit(List<? extends IndexCommit> commits) {
// Note that commits.size() should normally be 2 (if not
// called by onInit above):
int size = commits.size();
for (int i = 0; i < size - 1; i++) {
commits.get(i).delete();
}
}
}