CavalliumDBEngine/src/main/java/it/cavallium/dbengine/client/Hits.java

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