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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.search.internal;
import org.apache.lucene.index.DirectoryReader;
import org.apache.lucene.index.Term;
import org.apache.lucene.index.TermContext;
import org.apache.lucene.search.CollectionStatistics;
import org.apache.lucene.search.Explanation;
import org.apache.lucene.search.IndexSearcher;
import org.apache.lucene.search.Query;
import org.apache.lucene.search.QueryCache;
import org.apache.lucene.search.QueryCachingPolicy;
import org.apache.lucene.search.TermStatistics;
import org.apache.lucene.search.Weight;
import org.elasticsearch.common.lease.Releasable;
import org.elasticsearch.index.engine.Engine;
import org.elasticsearch.search.dfs.AggregatedDfs;
import org.elasticsearch.search.profile.query.ProfileWeight;
import org.elasticsearch.search.profile.query.QueryProfileBreakdown;
import org.elasticsearch.search.profile.query.QueryProfiler;
import org.elasticsearch.search.profile.query.QueryTimingType;
import java.io.IOException;
/**
* Context-aware extension of {@link IndexSearcher}.
*/
public class ContextIndexSearcher extends IndexSearcher implements Releasable {
/** The wrapped {@link IndexSearcher}. The reason why we sometimes prefer delegating to this searcher instead of <tt>super</tt> is that
* this instance may have more assertions, for example if it comes from MockInternalEngine which wraps the IndexSearcher into an
* AssertingIndexSearcher. */
private final IndexSearcher in;
private AggregatedDfs aggregatedDfs;
private final Engine.Searcher engineSearcher;
// TODO revisit moving the profiler to inheritance or wrapping model in the future
private QueryProfiler profiler;
public ContextIndexSearcher(Engine.Searcher searcher,
QueryCache queryCache, QueryCachingPolicy queryCachingPolicy) {
super(searcher.reader());
in = searcher.searcher();
engineSearcher = searcher;
setSimilarity(searcher.searcher().getSimilarity(true));
setQueryCache(queryCache);
setQueryCachingPolicy(queryCachingPolicy);
}
@Override
public void close() {
}
public void setProfiler(QueryProfiler profiler) {
this.profiler = profiler;
}
public void setAggregatedDfs(AggregatedDfs aggregatedDfs) {
this.aggregatedDfs = aggregatedDfs;
}
@Override
public Query rewrite(Query original) throws IOException {
if (profiler != null) {
profiler.startRewriteTime();
}
try {
return in.rewrite(original);
} finally {
if (profiler != null) {
profiler.stopAndAddRewriteTime();
}
}
}
@Override
public Weight createNormalizedWeight(Query query, boolean needsScores) throws IOException {
// During tests we prefer to use the wrapped IndexSearcher, because then we use the AssertingIndexSearcher
// it is hacky, because if we perform a dfs search, we don't use the wrapped IndexSearcher...
if (aggregatedDfs != null && needsScores) {
// if scores are needed and we have dfs data then use it
return super.createNormalizedWeight(query, needsScores);
} else if (profiler != null) {
// we need to use the createWeight method to insert the wrappers
return super.createNormalizedWeight(query, needsScores);
} else {
return in.createNormalizedWeight(query, needsScores);
}
}
@Override
public Weight createWeight(Query query, boolean needsScores) throws IOException {
if (profiler != null) {
// createWeight() is called for each query in the tree, so we tell the queryProfiler
// each invocation so that it can build an internal representation of the query
// tree
QueryProfileBreakdown profile = profiler.getQueryBreakdown(query);
profile.startTime(QueryTimingType.CREATE_WEIGHT);
final Weight weight;
try {
weight = super.createWeight(query, needsScores);
} finally {
profile.stopAndRecordTime();
profiler.pollLastElement();
}
return new ProfileWeight(query, weight, profile);
} else {
// needs to be 'super', not 'in' in order to use aggregated DFS
return super.createWeight(query, needsScores);
}
}
@Override
public Explanation explain(Query query, int doc) throws IOException {
if (aggregatedDfs != null) {
// dfs data is needed to explain the score
return super.explain(createNormalizedWeight(query, true), doc);
}
return in.explain(query, doc);
}
@Override
public TermStatistics termStatistics(Term term, TermContext context) throws IOException {
if (aggregatedDfs == null) {
// we are either executing the dfs phase or the search_type doesn't include the dfs phase.
return super.termStatistics(term, context);
}
TermStatistics termStatistics = aggregatedDfs.termStatistics().get(term);
if (termStatistics == null) {
// we don't have stats for this - this might be a must_not clauses etc. that doesn't allow extract terms on the query
return super.termStatistics(term, context);
}
return termStatistics;
}
@Override
public CollectionStatistics collectionStatistics(String field) throws IOException {
if (aggregatedDfs == null) {
// we are either executing the dfs phase or the search_type doesn't include the dfs phase.
return super.collectionStatistics(field);
}
CollectionStatistics collectionStatistics = aggregatedDfs.fieldStatistics().get(field);
if (collectionStatistics == null) {
// we don't have stats for this - this might be a must_not clauses etc. that doesn't allow extract terms on the query
return super.collectionStatistics(field);
}
return collectionStatistics;
}
public DirectoryReader getDirectoryReader() {
return engineSearcher.getDirectoryReader();
}
}
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