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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.dfs;
import com.carrotsearch.hppc.ObjectObjectOpenHashMap;
import com.carrotsearch.hppc.ObjectOpenHashSet;
import com.carrotsearch.hppc.cursors.ObjectCursor;
import com.google.common.collect.ImmutableMap;
import org.apache.lucene.index.IndexReaderContext;
import org.apache.lucene.index.Term;
import org.apache.lucene.index.TermContext;
import org.apache.lucene.search.CollectionStatistics;
import org.apache.lucene.search.TermStatistics;
import org.elasticsearch.common.collect.HppcMaps;
import org.elasticsearch.search.SearchParseElement;
import org.elasticsearch.search.SearchPhase;
import org.elasticsearch.search.internal.SearchContext;
import org.elasticsearch.search.rescore.RescoreSearchContext;
import java.util.AbstractSet;
import java.util.Collection;
import java.util.Iterator;
import java.util.Map;
/**
*
*/
public class DfsPhase implements SearchPhase {
private static ThreadLocal<ObjectOpenHashSet<Term>> cachedTermsSet = new ThreadLocal<ObjectOpenHashSet<Term>>() {
@Override
protected ObjectOpenHashSet<Term> initialValue() {
return new ObjectOpenHashSet<>();
}
};
@Override
public Map<String, ? extends SearchParseElement> parseElements() {
return ImmutableMap.of();
}
@Override
public void preProcess(SearchContext context) {
}
public void execute(SearchContext context) {
final ObjectOpenHashSet<Term> termsSet = cachedTermsSet.get();
try {
if (!context.queryRewritten()) {
context.updateRewriteQuery(context.searcher().rewrite(context.query()));
}
if (!termsSet.isEmpty()) {
termsSet.clear();
}
context.query().extractTerms(new DelegateSet(termsSet));
for (RescoreSearchContext rescoreContext : context.rescore()) {
rescoreContext.rescorer().extractTerms(context, rescoreContext, new DelegateSet(termsSet));
}
Term[] terms = termsSet.toArray(Term.class);
TermStatistics[] termStatistics = new TermStatistics[terms.length];
IndexReaderContext indexReaderContext = context.searcher().getTopReaderContext();
for (int i = 0; i < terms.length; i++) {
// LUCENE 4 UPGRADE: cache TermContext?
TermContext termContext = TermContext.build(indexReaderContext, terms[i]);
termStatistics[i] = context.searcher().termStatistics(terms[i], termContext);
}
ObjectObjectOpenHashMap<String, CollectionStatistics> fieldStatistics = HppcMaps.newNoNullKeysMap();
for (Term term : terms) {
assert term.field() != null : "field is null";
if (!fieldStatistics.containsKey(term.field())) {
final CollectionStatistics collectionStatistics = context.searcher().collectionStatistics(term.field());
fieldStatistics.put(term.field(), collectionStatistics);
}
}
context.dfsResult().termsStatistics(terms, termStatistics)
.fieldStatistics(fieldStatistics)
.maxDoc(context.searcher().getIndexReader().maxDoc());
} catch (Exception e) {
throw new DfsPhaseExecutionException(context, "Exception during dfs phase", e);
} finally {
termsSet.clear(); // don't hold on to terms
}
}
// We need to bridge to JCF world, b/c of Query#extractTerms
private static class DelegateSet extends AbstractSet<Term> {
private final ObjectOpenHashSet<Term> delegate;
private DelegateSet(ObjectOpenHashSet<Term> delegate) {
this.delegate = delegate;
}
@Override
public boolean add(Term term) {
return delegate.add(term);
}
@Override
public boolean addAll(Collection<? extends Term> terms) {
boolean result = false;
for (Term term : terms) {
result = delegate.add(term);
}
return result;
}
@Override
public Iterator<Term> iterator() {
final Iterator<ObjectCursor<Term>> iterator = delegate.iterator();
return new Iterator<Term>() {
@Override
public boolean hasNext() {
return iterator.hasNext();
}
@Override
public Term next() {
return iterator.next().value;
}
@Override
public void remove() {
throw new UnsupportedOperationException();
}
};
}
@Override
public int size() {
return delegate.size();
}
}
}