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/*
* 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.solr.search.grouping;
import java.io.IOException;
import java.lang.invoke.MethodHandles;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import org.apache.lucene.index.ExitableDirectoryReader;
import org.apache.lucene.queries.function.ValueSource;
import org.apache.lucene.search.BooleanClause.Occur;
import org.apache.lucene.search.BooleanQuery;
import org.apache.lucene.search.Collector;
import org.apache.lucene.search.MultiCollector;
import org.apache.lucene.search.Query;
import org.apache.lucene.search.TimeLimitingCollector;
import org.apache.lucene.search.TotalHitCountCollector;
import org.apache.lucene.search.grouping.AllGroupHeadsCollector;
import org.apache.lucene.search.grouping.TermGroupSelector;
import org.apache.lucene.search.grouping.ValueSourceGroupSelector;
import org.apache.solr.common.util.NamedList;
import org.apache.solr.schema.FieldType;
import org.apache.solr.schema.SchemaField;
import org.apache.solr.search.BitDocSet;
import org.apache.solr.search.DocSet;
import org.apache.solr.search.DocSetCollector;
import org.apache.solr.search.DocSetUtil;
import org.apache.solr.search.QueryCommand;
import org.apache.solr.search.QueryResult;
import org.apache.solr.search.QueryUtils;
import org.apache.solr.search.SolrIndexSearcher;
import org.apache.solr.search.SolrIndexSearcher.ProcessedFilter;
import org.apache.solr.search.grouping.distributed.shardresultserializer.ShardResultTransformer;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
/**
* Responsible for executing a search with a number of {@link Command} instances.
* A typical search can have more then one {@link Command} instances.
*
* @lucene.experimental
*/
public class CommandHandler {
public static class Builder {
private QueryCommand queryCommand;
private List commands = new ArrayList<>();
private SolrIndexSearcher searcher;
private boolean needDocSet = false;
private boolean truncateGroups = false;
private boolean includeHitCount = false;
public Builder setQueryCommand(QueryCommand queryCommand) {
this.queryCommand = queryCommand;
this.needDocSet = (queryCommand.getFlags() & SolrIndexSearcher.GET_DOCSET) != 0;
return this;
}
public Builder addCommandField(Command commandField) {
commands.add(commandField);
return this;
}
public Builder setSearcher(SolrIndexSearcher searcher) {
this.searcher = searcher;
return this;
}
/**
* Sets whether to compute a {@link DocSet}.
* May override the value set by {@link #setQueryCommand(org.apache.solr.search.QueryCommand)}.
*
* @param needDocSet Whether to compute a {@link DocSet}
* @return this
*/
public Builder setNeedDocSet(boolean needDocSet) {
this.needDocSet = needDocSet;
return this;
}
public Builder setTruncateGroups(boolean truncateGroups) {
this.truncateGroups = truncateGroups;
return this;
}
public Builder setIncludeHitCount(boolean includeHitCount) {
this.includeHitCount = includeHitCount;
return this;
}
public CommandHandler build() {
if (queryCommand == null || searcher == null) {
throw new IllegalStateException("All fields must be set");
}
return new CommandHandler(queryCommand, commands, searcher, needDocSet, truncateGroups, includeHitCount);
}
}
private static final Logger log = LoggerFactory.getLogger(MethodHandles.lookup().lookupClass());
private final QueryCommand queryCommand;
private final List commands;
private final SolrIndexSearcher searcher;
private final boolean needDocset;
private final boolean truncateGroups;
private final boolean includeHitCount;
private boolean partialResults = false;
private int totalHitCount;
private DocSet docSet;
private CommandHandler(QueryCommand queryCommand,
List commands,
SolrIndexSearcher searcher,
boolean needDocset,
boolean truncateGroups,
boolean includeHitCount) {
this.queryCommand = queryCommand;
this.commands = commands;
this.searcher = searcher;
this.needDocset = needDocset;
this.truncateGroups = truncateGroups;
this.includeHitCount = includeHitCount;
}
@SuppressWarnings("unchecked")
public void execute() throws IOException {
final int nrOfCommands = commands.size();
List collectors = new ArrayList<>(nrOfCommands);
for (Command command : commands) {
collectors.addAll(command.create());
}
ProcessedFilter filter = searcher.getProcessedFilter
(queryCommand.getFilter(), queryCommand.getFilterList());
Query query = QueryUtils.makeQueryable(queryCommand.getQuery());
if (truncateGroups) {
docSet = computeGroupedDocSet(query, filter, collectors);
} else if (needDocset) {
docSet = computeDocSet(query, filter, collectors);
} else if (!collectors.isEmpty()) {
searchWithTimeLimiter(query, filter, MultiCollector.wrap(collectors.toArray(new Collector[nrOfCommands])));
} else {
searchWithTimeLimiter(query, filter, null);
}
for (Command command : commands) {
command.postCollect(searcher);
}
}
private DocSet computeGroupedDocSet(Query query, ProcessedFilter filter, List collectors) throws IOException {
Command firstCommand = commands.get(0);
String field = firstCommand.getKey();
SchemaField sf = searcher.getSchema().getField(field);
FieldType fieldType = sf.getType();
final AllGroupHeadsCollector allGroupHeadsCollector;
if (fieldType.getNumberType() != null) {
ValueSource vs = fieldType.getValueSource(sf, null);
allGroupHeadsCollector = AllGroupHeadsCollector.newCollector(new ValueSourceGroupSelector(vs, new HashMap<>()),
firstCommand.getWithinGroupSort());
} else {
allGroupHeadsCollector
= AllGroupHeadsCollector.newCollector(new TermGroupSelector(firstCommand.getKey()), firstCommand.getWithinGroupSort());
}
if (collectors.isEmpty()) {
searchWithTimeLimiter(query, filter, allGroupHeadsCollector);
} else {
collectors.add(allGroupHeadsCollector);
searchWithTimeLimiter(query, filter, MultiCollector.wrap(collectors.toArray(new Collector[collectors.size()])));
}
return new BitDocSet(allGroupHeadsCollector.retrieveGroupHeads(searcher.maxDoc()));
}
private DocSet computeDocSet(Query query, ProcessedFilter filter, List collectors) throws IOException {
int maxDoc = searcher.maxDoc();
final DocSetCollector docSetCollector = new DocSetCollector(maxDoc);
List allCollectors = new ArrayList<>(collectors);
allCollectors.add(docSetCollector);
searchWithTimeLimiter(query, filter, MultiCollector.wrap(allCollectors));
return DocSetUtil.getDocSet( docSetCollector, searcher );
}
@SuppressWarnings("unchecked")
public NamedList processResult(QueryResult queryResult, ShardResultTransformer transformer) throws IOException {
if (docSet != null) {
queryResult.setDocSet(docSet);
}
queryResult.setPartialResults(partialResults);
return transformer.transform(commands);
}
/**
* Invokes search with the specified filter and collector.
* If a time limit has been specified then wrap the collector in the TimeLimitingCollector
*/
private void searchWithTimeLimiter(Query query,
ProcessedFilter filter,
Collector collector) throws IOException {
if (queryCommand.getTimeAllowed() > 0 ) {
collector = new TimeLimitingCollector(collector, TimeLimitingCollector.getGlobalCounter(), queryCommand.getTimeAllowed());
}
TotalHitCountCollector hitCountCollector = new TotalHitCountCollector();
if (includeHitCount) {
collector = MultiCollector.wrap(collector, hitCountCollector);
}
if (filter.filter != null) {
query = new BooleanQuery.Builder()
.add(query, Occur.MUST)
.add(filter.filter, Occur.FILTER)
.build();
}
if (filter.postFilter != null) {
filter.postFilter.setLastDelegate(collector);
collector = filter.postFilter;
}
try {
searcher.search(query, collector);
} catch (TimeLimitingCollector.TimeExceededException | ExitableDirectoryReader.ExitingReaderException x) {
partialResults = true;
log.warn( "Query: " + query + "; " + x.getMessage() );
}
if (includeHitCount) {
totalHitCount = hitCountCollector.getTotalHits();
}
}
public int getTotalHitCount() {
return totalHitCount;
}
}