119 lines
4.5 KiB
Java
119 lines
4.5 KiB
Java
package it.cavallium.dbengine.lucene.searcher;
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import static it.cavallium.dbengine.lucene.searcher.CurrentPageInfo.EMPTY_STATUS;
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import static it.cavallium.dbengine.lucene.searcher.PaginationInfo.FIRST_PAGE_LIMIT;
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import static it.cavallium.dbengine.lucene.searcher.PaginationInfo.MAX_SINGLE_SEARCH_LIMIT;
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import it.cavallium.dbengine.database.LLKeyScore;
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import it.cavallium.dbengine.lucene.LuceneUtils;
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import java.io.IOException;
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import java.util.Objects;
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import org.apache.lucene.search.IndexSearcher;
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import org.apache.lucene.search.ScoreDoc;
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import org.apache.lucene.search.TopDocs;
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import org.apache.lucene.search.TopDocsCollector;
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import reactor.core.publisher.Flux;
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import reactor.core.publisher.Mono;
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import reactor.core.scheduler.Scheduler;
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public class SimpleLuceneLocalSearcher implements LuceneLocalSearcher {
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@Override
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public Mono<LuceneSearchResult> collect(IndexSearcher indexSearcher,
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Mono<Void> releaseIndexSearcher,
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LocalQueryParams queryParams,
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String keyFieldName,
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Scheduler scheduler) {
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return Mono
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.fromCallable(() -> {
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Objects.requireNonNull(queryParams.scoreMode(), "ScoreMode must not be null");
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PaginationInfo paginationInfo;
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if (queryParams.limit() <= MAX_SINGLE_SEARCH_LIMIT) {
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paginationInfo = new PaginationInfo(queryParams.limit(), queryParams.offset(), queryParams.limit(), true);
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} else {
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paginationInfo = new PaginationInfo(queryParams.limit(), queryParams.offset(), FIRST_PAGE_LIMIT, false);
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}
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TopDocs firstPageTopDocs;
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{
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TopDocsCollector<ScoreDoc> firstPageCollector = TopDocsSearcher.getTopDocsCollector(
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queryParams.sort(),
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LuceneUtils.safeLongToInt(paginationInfo.firstPageOffset() + paginationInfo.firstPageLimit()),
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null,
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LuceneUtils.totalHitsThreshold(),
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queryParams.isScored());
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//noinspection BlockingMethodInNonBlockingContext
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indexSearcher.search(queryParams.query(), firstPageCollector);
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firstPageTopDocs = firstPageCollector.topDocs(LuceneUtils.safeLongToInt(paginationInfo.firstPageOffset()),
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LuceneUtils.safeLongToInt(paginationInfo.firstPageLimit())
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);
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}
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Flux<LLKeyScore> firstPageMono = LuceneUtils
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.convertHits(
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firstPageTopDocs.scoreDocs,
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IndexSearchers.unsharded(indexSearcher),
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keyFieldName,
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scheduler
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)
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.take(queryParams.limit(), true);
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Flux<LLKeyScore> nextHits;
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if (paginationInfo.forceSinglePage() || paginationInfo.totalLimit() - paginationInfo.firstPageLimit() <= 0) {
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nextHits = null;
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} else {
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nextHits = Flux.defer(() -> {
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return Flux
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.<TopDocs, CurrentPageInfo>generate(
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() -> new CurrentPageInfo(LuceneUtils.getLastScoreDoc(firstPageTopDocs.scoreDocs), paginationInfo.totalLimit() - paginationInfo.firstPageLimit(), 1),
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(s, sink) -> {
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if (s.last() != null && s.remainingLimit() > 0) {
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TopDocs pageTopDocs;
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try {
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TopDocsCollector<ScoreDoc> collector = TopDocsSearcher.getTopDocsCollector(queryParams.sort(),
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s.currentPageLimit(),
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s.last(),
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LuceneUtils.totalHitsThreshold(),
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queryParams.isScored()
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);
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//noinspection BlockingMethodInNonBlockingContext
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indexSearcher.search(queryParams.query(), collector);
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pageTopDocs = collector.topDocs();
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} catch (IOException e) {
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sink.error(e);
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return EMPTY_STATUS;
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}
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var pageLastDoc = LuceneUtils.getLastScoreDoc(pageTopDocs.scoreDocs);
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sink.next(pageTopDocs);
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return new CurrentPageInfo(pageLastDoc, s.remainingLimit() - s.currentPageLimit(), s.pageIndex() + 1);
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} else {
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sink.complete();
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return EMPTY_STATUS;
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}
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},
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s -> {}
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)
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.subscribeOn(scheduler)
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.flatMapSequential(topFieldDoc -> LuceneUtils
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.convertHits(topFieldDoc.scoreDocs, IndexSearchers.unsharded(indexSearcher), keyFieldName, scheduler)
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);
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});
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}
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Flux<LLKeyScore> combinedFlux;
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if (nextHits != null) {
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combinedFlux = firstPageMono
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.concatWith(nextHits);
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} else {
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combinedFlux = firstPageMono;
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}
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return new LuceneSearchResult(firstPageTopDocs.totalHits.value, combinedFlux,
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//.transform(flux -> LuceneUtils.filterTopDoc(flux, queryParams)),
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releaseIndexSearcher
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);
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})
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.subscribeOn(scheduler);
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}
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}
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