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Elasticsearch subproject :server
/*
* 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.profile.query;
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;
import org.elasticsearch.search.profile.Timer;
import java.io.IOException;
import java.util.Set;
/**
* 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.
*/
public final class ProfileWeight extends Weight {
private final Weight subQueryWeight;
private final QueryProfileBreakdown profile;
public ProfileWeight(Query query, Weight subQueryWeight, QueryProfileBreakdown profile) throws IOException {
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 {
Timer timer = profile.getTimer(QueryTimingType.BUILD_SCORER);
timer.start();
final ScorerSupplier subQueryScorerSupplier;
try {
subQueryScorerSupplier = subQueryWeight.scorerSupplier(context);
} finally {
timer.stop();
}
if (subQueryScorerSupplier == null) {
return null;
}
final ProfileWeight weight = this;
return new ScorerSupplier() {
@Override
public Scorer get(long loadCost) throws IOException {
timer.start();
try {
return new ProfileScorer(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 void extractTerms(Set set) {
subQueryWeight.extractTerms(set);
}
@Override
public boolean isCacheable(LeafReaderContext ctx) {
return subQueryWeight.isCacheable(ctx);
}
}