92 lines
3.6 KiB
Java
92 lines
3.6 KiB
Java
package it.cavallium.dbengine.tests;
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import static it.cavallium.dbengine.lucene.searcher.GlobalQueryRewrite.NO_REWRITE;
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import com.google.common.collect.Streams;
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import it.cavallium.dbengine.client.query.current.data.TotalHitsCount;
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import it.cavallium.dbengine.database.LLKeyScore;
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import it.cavallium.dbengine.database.disk.LLIndexSearchers;
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import it.cavallium.dbengine.lucene.LuceneCloseable;
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import it.cavallium.dbengine.lucene.LuceneUtils;
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import it.cavallium.dbengine.lucene.searcher.GlobalQueryRewrite;
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import it.cavallium.dbengine.lucene.searcher.LocalQueryParams;
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import it.cavallium.dbengine.lucene.searcher.LocalSearcher;
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import it.cavallium.dbengine.lucene.searcher.LuceneSearchResult;
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import it.cavallium.dbengine.lucene.searcher.MultiSearcher;
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import it.cavallium.dbengine.utils.SimpleResource;
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import java.io.UncheckedIOException;
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import java.util.ArrayList;
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import java.util.List;
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import java.util.function.Function;
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import java.util.stream.Stream;
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import org.apache.logging.log4j.LogManager;
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import org.apache.logging.log4j.Logger;
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import org.jetbrains.annotations.Nullable;
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public class UnsortedUnscoredSimpleMultiSearcher implements MultiSearcher {
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private static final Logger LOG = LogManager.getLogger(UnsortedUnscoredSimpleMultiSearcher.class);
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private final LocalSearcher localSearcher;
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public UnsortedUnscoredSimpleMultiSearcher(LocalSearcher localSearcher) {
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this.localSearcher = localSearcher;
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}
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@Override
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public LuceneSearchResult collectMulti(LLIndexSearchers indexSearchers,
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LocalQueryParams queryParams,
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@Nullable String keyFieldName,
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GlobalQueryRewrite transformer,
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Function<Stream<LLKeyScore>, Stream<LLKeyScore>> filterer) {
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if (transformer != NO_REWRITE) {
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return LuceneUtils.rewriteMulti(this, indexSearchers, queryParams, keyFieldName, transformer, filterer);
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}
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if (queryParams.isSorted() && queryParams.limitLong() > 0) {
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throw new UnsupportedOperationException(
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"Sorted queries are not supported" + " by SimpleUnsortedUnscoredLuceneMultiSearcher");
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}
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if (queryParams.needsScores() && queryParams.limitLong() > 0) {
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throw new UnsupportedOperationException(
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"Scored queries are not supported" + " by SimpleUnsortedUnscoredLuceneMultiSearcher");
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}
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var localQueryParams = getLocalQueryParams(queryParams);
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var results = indexSearchers.llShards().stream()
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.map(searcher -> localSearcher.collect(searcher, localQueryParams, keyFieldName, transformer, filterer))
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.toList();
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List<Stream<LLKeyScore>> resultsFluxes = new ArrayList<>(results.size());
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boolean exactTotalHitsCount = true;
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long totalHitsCountValue = 0;
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for (LuceneSearchResult result : results) {
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resultsFluxes.add(result.results().stream());
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exactTotalHitsCount &= result.totalHitsCount().exact();
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totalHitsCountValue += result.totalHitsCount().value();
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}
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var totalHitsCount = new TotalHitsCount(totalHitsCountValue, exactTotalHitsCount);
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//noinspection unchecked
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Stream<LLKeyScore> mergedFluxes = (Stream<LLKeyScore>) (Stream) Streams.concat(resultsFluxes.toArray(Stream<?>[]::new))
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.skip(queryParams.offsetLong())
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.limit(queryParams.limitLong());
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return new LuceneSearchResult(totalHitsCount, mergedFluxes.toList());
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}
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private LocalQueryParams getLocalQueryParams(LocalQueryParams queryParams) {
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return new LocalQueryParams(queryParams.query(),
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0L,
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queryParams.offsetLong() + queryParams.limitLong(),
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queryParams.pageLimits(),
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queryParams.sort(),
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queryParams.computePreciseHitsCount(),
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queryParams.timeout()
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);
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}
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@Override
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public String toString() {
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return "unsorted unscored simple multi";
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}
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}
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