| /* |
| * Licensed to the Apache Software Foundation (ASF) under one or more |
| * contributor license agreements. See the NOTICE file distributed with |
| * this work for additional information regarding copyright ownership. |
| * The ASF 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.apache.lucene.sandbox.search; |
| |
| import java.io.IOException; |
| import java.util.Set; |
| |
| import org.apache.lucene.index.LeafReaderContext; |
| import org.apache.lucene.index.Term; |
| import org.apache.lucene.search.BulkScorer; |
| import org.apache.lucene.search.Explanation; |
| import org.apache.lucene.search.Query; |
| import org.apache.lucene.search.Scorer; |
| import org.apache.lucene.search.ScorerSupplier; |
| import org.apache.lucene.search.Weight; |
| |
| /** |
| * Weight wrapper that will compute how much time it takes to build the {@link Scorer} and then |
| * return a {@link Scorer} that is wrapped in order to compute timings as well. |
| */ |
| class QueryProfilerWeight extends Weight { |
| |
| private final Weight subQueryWeight; |
| private final QueryProfilerBreakdown profile; |
| |
| public QueryProfilerWeight(Query query, Weight subQueryWeight, QueryProfilerBreakdown profile) { |
| super(query); |
| this.subQueryWeight = subQueryWeight; |
| this.profile = profile; |
| } |
| |
| @Override |
| public Scorer scorer(LeafReaderContext context) throws IOException { |
| ScorerSupplier supplier = scorerSupplier(context); |
| if (supplier == null) { |
| return null; |
| } |
| return supplier.get(Long.MAX_VALUE); |
| } |
| |
| @Override |
| public ScorerSupplier scorerSupplier(LeafReaderContext context) throws IOException { |
| QueryProfilerTimer timer = profile.getTimer(QueryProfilerTimingType.BUILD_SCORER); |
| timer.start(); |
| final ScorerSupplier subQueryScorerSupplier; |
| try { |
| subQueryScorerSupplier = subQueryWeight.scorerSupplier(context); |
| } finally { |
| timer.stop(); |
| } |
| if (subQueryScorerSupplier == null) { |
| return null; |
| } |
| |
| final QueryProfilerWeight weight = this; |
| return new ScorerSupplier() { |
| |
| @Override |
| public Scorer get(long loadCost) throws IOException { |
| timer.start(); |
| try { |
| return new QueryProfilerScorer(weight, subQueryScorerSupplier.get(loadCost), profile); |
| } finally { |
| timer.stop(); |
| } |
| } |
| |
| @Override |
| public long cost() { |
| timer.start(); |
| try { |
| return subQueryScorerSupplier.cost(); |
| } finally { |
| timer.stop(); |
| } |
| } |
| }; |
| } |
| |
| @Override |
| public BulkScorer bulkScorer(LeafReaderContext context) throws IOException { |
| // We use the default bulk scorer instead of the specialized one. The reason |
| // is that Lucene's BulkScorers do everything at once: finding matches, |
| // scoring them and calling the collector, so they make it impossible to |
| // see where time is spent, which is the purpose of query profiling. |
| // The default bulk scorer will pull a scorer and iterate over matches, |
| // this might be a significantly different execution path for some queries |
| // like disjunctions, but in general this is what is done anyway |
| return super.bulkScorer(context); |
| } |
| |
| @Override |
| public Explanation explain(LeafReaderContext context, int doc) throws IOException { |
| return subQueryWeight.explain(context, doc); |
| } |
| |
| @Override |
| public boolean isCacheable(LeafReaderContext ctx) { |
| return false; |
| } |
| |
| @Override |
| public void extractTerms(Set<Term> terms) { |
| subQueryWeight.extractTerms(terms); |
| } |
| } |