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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.index.cache.query.parser.resident;
import com.google.common.cache.Cache;
import com.google.common.cache.CacheBuilder;
import org.apache.lucene.queryparser.classic.QueryParserSettings;
import org.apache.lucene.search.Query;
import org.elasticsearch.ElasticsearchException;
import org.elasticsearch.common.inject.Inject;
import org.elasticsearch.common.settings.Settings;
import org.elasticsearch.common.unit.TimeValue;
import org.elasticsearch.index.AbstractIndexComponent;
import org.elasticsearch.index.Index;
import org.elasticsearch.index.cache.query.parser.QueryParserCache;
import org.elasticsearch.index.settings.IndexSettings;
import java.util.concurrent.TimeUnit;
/**
* A small (by default) query parser cache mainly to not parse the same query string several times
* if several shards exists on the same node.
*/
public class ResidentQueryParserCache extends AbstractIndexComponent implements QueryParserCache {
private final Cache<QueryParserSettings, Query> cache;
private volatile int maxSize;
private volatile TimeValue expire;
@Inject
public ResidentQueryParserCache(Index index, @IndexSettings Settings indexSettings) {
super(index, indexSettings);
this.maxSize = componentSettings.getAsInt("max_size", 100);
this.expire = componentSettings.getAsTime("expire", null);
logger.debug("using [resident] query cache with max_size [{}], expire [{}]", maxSize, expire);
CacheBuilder cacheBuilder = CacheBuilder.newBuilder().maximumSize(maxSize);
if (expire != null) {
cacheBuilder.expireAfterAccess(expire.nanos(), TimeUnit.NANOSECONDS);
}
this.cache = cacheBuilder.build();
}
@Override
public Query get(QueryParserSettings queryString) {
Query value = cache.getIfPresent(queryString);
if (value != null) {
return value.clone();
} else {
return null;
}
}
@Override
public void put(QueryParserSettings queryString, Query query) {
if (queryString.isCacheable()) {
cache.put(queryString, query);
}
}
@Override
public void clear() {
cache.invalidateAll();
}
@Override
public void close() throws ElasticsearchException {
cache.invalidateAll();
}
}