/*
* 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.search.suggest.completion;
import com.carrotsearch.hppc.ObjectLongHashMap;
import org.apache.lucene.index.Fields;
import org.apache.lucene.index.IndexReader;
import org.apache.lucene.index.LeafReader;
import org.apache.lucene.index.LeafReaderContext;
import org.apache.lucene.index.Terms;
import org.apache.lucene.search.suggest.document.CompletionTerms;
import org.elasticsearch.ElasticsearchException;
import org.elasticsearch.common.FieldMemoryStats;
import org.elasticsearch.common.regex.Regex;
import java.io.IOException;
public class CompletionFieldStats {
/**
* Returns total in-heap bytes used by all suggesters. This method has CPU cost <code>O(numIndexedFields)</code>.
*
* @param fieldNamePatterns if non-null, any completion field name matching any of these patterns will break out its in-heap bytes
* separately in the returned {@link CompletionStats}
*/
public static CompletionStats completionStats(IndexReader indexReader, String ... fieldNamePatterns) {
long sizeInBytes = 0;
ObjectLongHashMap<String> completionFields = null;
if (fieldNamePatterns != null && fieldNamePatterns.length > 0) {
completionFields = new ObjectLongHashMap<>(fieldNamePatterns.length);
}
for (LeafReaderContext atomicReaderContext : indexReader.leaves()) {
LeafReader atomicReader = atomicReaderContext.reader();
try {
Fields fields = atomicReader.fields();
for (String fieldName : fields) {
Terms terms = fields.terms(fieldName);
if (terms instanceof CompletionTerms) {
// TODO: currently we load up the suggester for reporting its size
long fstSize = ((CompletionTerms) terms).suggester().ramBytesUsed();
if (fieldNamePatterns != null && fieldNamePatterns.length > 0 && Regex.simpleMatch(fieldNamePatterns, fieldName)) {
completionFields.addTo(fieldName, fstSize);
}
sizeInBytes += fstSize;
}
}
} catch (IOException ioe) {
throw new ElasticsearchException(ioe);
}
}
return new CompletionStats(sizeInBytes, completionFields == null ? null : new FieldMemoryStats(completionFields));
}
}