CavalliumDBEngine/src/main/java/it/cavallium/dbengine/lucene/searcher/AdaptiveMultiSearcher.java

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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.disk.LLIndexSearchers;
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import it.cavallium.dbengine.lucene.LuceneUtils;
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import java.io.IOException;
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import org.jetbrains.annotations.Nullable;
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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/**
* Use in-memory collectors if the expected results count is lower or equal than this limit
*/
private final int maxInMemoryResultEntries;
public AdaptiveMultiSearcher(int maxInMemoryResultEntries) {
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this.maxInMemoryResultEntries = maxInMemoryResultEntries;
}
@Override
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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if (transformer != NO_REWRITE) {
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return LuceneUtils.rewriteMulti(this, indexSearchers, queryParams, keyFieldName, transformer);
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}
return transformedCollectMulti(indexSearchers, queryParams, keyFieldName, transformer);
}
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// Remember to change also AdaptiveLocalSearcher
public LuceneSearchResult transformedCollectMulti(LLIndexSearchers indexSearchers,
LocalQueryParams queryParams,
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@Nullable String keyFieldName,
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GlobalQueryRewrite transformer) {
// offset + limit
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long realLimit = queryParams.offsetLong() + queryParams.limitLong();
long maxAllowedInMemoryLimit
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= Math.max(maxInMemoryResultEntries, (long) queryParams.pageLimits().getPageLimit(0));
if (queryParams.limitLong() == 0) {
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return count.collectMulti(indexSearchers, queryParams, keyFieldName, transformer);
} else if (realLimit <= maxInMemoryResultEntries) {
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return standardSearcher.collectMulti(indexSearchers, queryParams, keyFieldName, transformer);
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} else if (queryParams.isSorted()) {
if (realLimit <= maxAllowedInMemoryLimit) {
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return scoredPaged.collectMulti(indexSearchers, queryParams, keyFieldName, transformer);
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} else {
if (queryParams.isSortedByScore()) {
if (queryParams.limitLong() < maxInMemoryResultEntries) {
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throw new UnsupportedOperationException("Allowed limit is " + maxInMemoryResultEntries + " or greater");
}
return scoredPaged.collectMulti(indexSearchers, queryParams, keyFieldName, transformer);
} else {
if (queryParams.limitLong() < maxInMemoryResultEntries) {
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throw new UnsupportedOperationException("Allowed limit is " + maxInMemoryResultEntries + " or greater");
}
return scoredPaged.collectMulti(indexSearchers, queryParams, keyFieldName, transformer);
}
}
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} else {
// Run large/unbounded searches using the continuous multi searcher
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return unsortedUnscoredContinuous.collectMulti(indexSearchers, queryParams, keyFieldName, transformer);
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}
}
@Override
public String getName() {
return "adaptive local";
}
}