85 lines
3.4 KiB
Java
85 lines
3.4 KiB
Java
package it.cavallium.dbengine.lucene.searcher;
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import static it.cavallium.dbengine.lucene.searcher.GlobalQueryRewrite.NO_REWRITE;
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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.LuceneUtils;
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import java.util.function.Function;
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import java.util.stream.Stream;
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import org.jetbrains.annotations.Nullable;
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public class AdaptiveMultiSearcher implements MultiSearcher {
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private static final StandardSearcher standardSearcher = new StandardSearcher();
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private static final MultiSearcher count = new CountMultiSearcher();
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private static final MultiSearcher scoredPaged = new ScoredPagedMultiSearcher();
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private static final MultiSearcher unsortedUnscoredContinuous = new UnsortedStreamingMultiSearcher();
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/**
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* Use in-memory collectors if the expected results count is lower or equal than this limit
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*/
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private final int maxInMemoryResultEntries;
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public AdaptiveMultiSearcher(int maxInMemoryResultEntries) {
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this.maxInMemoryResultEntries = maxInMemoryResultEntries;
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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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return transformedCollectMulti(indexSearchers, queryParams, keyFieldName, transformer, filterer);
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}
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// Remember to change also AdaptiveLocalSearcher
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public LuceneSearchResult transformedCollectMulti(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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// offset + limit
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long realLimit = queryParams.offsetLong() + queryParams.limitLong();
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long maxAllowedInMemoryLimit
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= Math.max(maxInMemoryResultEntries, (long) queryParams.pageLimits().getPageLimit(0));
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if (queryParams.limitLong() == 0) {
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return count.collectMulti(indexSearchers, queryParams, keyFieldName, transformer, filterer);
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} else if (realLimit <= maxInMemoryResultEntries) {
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return standardSearcher.collectMulti(indexSearchers, queryParams, keyFieldName, transformer, filterer);
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} else if (queryParams.isSorted()) {
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if (realLimit <= maxAllowedInMemoryLimit) {
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return scoredPaged.collectMulti(indexSearchers, queryParams, keyFieldName, transformer, filterer);
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} else {
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if (queryParams.isSortedByScore()) {
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if (queryParams.limitLong() < maxInMemoryResultEntries) {
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throw new UnsupportedOperationException("Allowed limit is " + maxInMemoryResultEntries + " or greater");
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}
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return scoredPaged.collectMulti(indexSearchers, queryParams, keyFieldName, transformer, filterer);
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} else {
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if (queryParams.limitLong() < maxInMemoryResultEntries) {
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throw new UnsupportedOperationException("Allowed limit is " + maxInMemoryResultEntries + " or greater");
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}
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return scoredPaged.collectMulti(indexSearchers, queryParams, keyFieldName, transformer, filterer);
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}
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}
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} else {
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// Run large/unbounded searches using the continuous multi searcher
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return unsortedUnscoredContinuous.collectMulti(indexSearchers, queryParams, keyFieldName, transformer, filterer);
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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 "adaptive local";
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}
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}
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