114 lines
3.6 KiB
Java
114 lines
3.6 KiB
Java
package it.cavallium.dbengine.client;
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import io.netty5.buffer.api.Drop;
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import io.netty5.buffer.api.Owned;
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import io.netty5.buffer.api.Send;
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import it.cavallium.dbengine.client.query.current.data.TotalHitsCount;
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import io.netty5.buffer.api.internal.ResourceSupport;
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import it.cavallium.dbengine.database.DiscardingCloseable;
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import it.cavallium.dbengine.database.collections.ValueGetter;
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import it.cavallium.dbengine.database.collections.ValueTransformer;
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import it.cavallium.dbengine.utils.SimpleResource;
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import java.util.Map.Entry;
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import java.util.Optional;
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import java.util.function.Function;
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import reactor.core.publisher.Flux;
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import reactor.core.publisher.Mono;
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import reactor.util.function.Tuples;
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public final class Hits<T> extends SimpleResource implements DiscardingCloseable {
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private static final Hits<?> EMPTY_HITS = new Hits<>(Flux.empty(), TotalHitsCount.of(0, true), null, false);
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private Flux<T> results;
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private TotalHitsCount totalHitsCount;
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private Runnable onClose;
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public Hits(Flux<T> results, TotalHitsCount totalHitsCount, Runnable onClose) {
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this(results, totalHitsCount, onClose, true);
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}
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private Hits(Flux<T> results, TotalHitsCount totalHitsCount, Runnable onClose, boolean canClose) {
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super(canClose && onClose != null);
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this.results = results;
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this.totalHitsCount = totalHitsCount;
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this.onClose = onClose;
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}
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@SuppressWarnings("unchecked")
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public static <T> Hits<T> empty() {
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return (Hits<T>) EMPTY_HITS;
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}
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public static <K, V> Hits<LazyHitEntry<K, V>> withValuesLazy(Hits<LazyHitKey<K>> hits,
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ValueGetter<K, V> valuesGetter) {
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var hitsEntry = hits.results().map(hitKey -> hitKey.withValue(valuesGetter::get));
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return new Hits<>(hitsEntry, hits.totalHitsCount, hits::close);
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}
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public static <K, V> Hits<HitEntry<K, V>> withValues(Hits<HitKey<K>> hits, ValueGetter<K, V> valuesGetter) {
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var hitsEntry = hits.results().flatMap(hitKey -> hitKey.withValue(valuesGetter::get));
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return new Hits<>(hitsEntry, hits.totalHitsCount, hits::close);
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}
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public static <T, U> Function<Hits<HitKey<T>>, Hits<LazyHitEntry<T, U>>> generateMapper(
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ValueGetter<T, U> valueGetter) {
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return result -> {
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var hitsToTransform = result.results()
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.map(hit -> new LazyHitEntry<>(Mono.just(hit.key()), valueGetter.get(hit.key()), hit.score()));
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return new Hits<>(hitsToTransform, result.totalHitsCount(), result::close);
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};
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}
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public static <T, U> Function<Hits<HitKey<T>>, Hits<LazyHitEntry<T, U>>> generateMapper(
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ValueTransformer<T, U> valueTransformer) {
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return result -> {
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try {
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var sharedHitsFlux = result.results().publish().refCount(3);
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var scoresFlux = sharedHitsFlux.map(HitKey::score);
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var keysFlux = sharedHitsFlux.map(HitKey::key);
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var valuesFlux = valueTransformer.transform(keysFlux);
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var transformedFlux = Flux.zip((Object[] data) -> {
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//noinspection unchecked
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var keyMono = Mono.just((T) data[0]);
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//noinspection unchecked
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var val = (Entry<T, Optional<U>>) data[1];
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var valMono = Mono.justOrEmpty(val.getValue());
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var score = (Float) data[2];
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return new LazyHitEntry<>(keyMono, valMono, score);
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}, keysFlux, valuesFlux, scoresFlux);
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return new Hits<>(transformedFlux, result.totalHitsCount(), result::close);
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} catch (Throwable t) {
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result.close();
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throw t;
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}
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};
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}
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public Flux<T> results() {
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ensureOpen();
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return results;
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}
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public TotalHitsCount totalHitsCount() {
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ensureOpen();
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return totalHitsCount;
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}
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@Override
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public String toString() {
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return "Hits[" + "results=" + results + ", " + "totalHitsCount=" + totalHitsCount + ']';
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}
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@Override
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protected void onClose() {
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if (onClose != null) {
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onClose.run();
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}
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}
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}
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