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 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;
public final class Hits<T> extends ResourceSupport<Hits<T>, Hits<T>> {
private static final Drop<Hits<?>> DROP = new Drop<>() {
@Override
public void drop(Hits<?> obj) {
if (obj.onClose != null) {
obj.onClose.run();
}
}
@Override
public Drop<Hits<?>> fork() {
return this;
}
@Override
public void attach(Hits<?> obj) {
}
};
private Flux<T> results;
private TotalHitsCount totalHitsCount;
private Runnable onClose;
@SuppressWarnings({"unchecked", "rawtypes"})
public Hits(Flux<T> results, TotalHitsCount totalHitsCount, Runnable onClose) {
super((Drop<Hits<T>>) (Drop) DROP);
this.results = results;
this.totalHitsCount = totalHitsCount;
this.onClose = onClose;
}
public static <T> Hits<T> empty() {
return new Hits<>(Flux.empty(), TotalHitsCount.of(0, true), null);
}
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() {
return results;
}
public TotalHitsCount totalHitsCount() {
return totalHitsCount;
}
@Override
public String toString() {
return "Hits[" + "results=" + results + ", " + "totalHitsCount=" + totalHitsCount + ']';
}
@Override
protected RuntimeException createResourceClosedException() {
return new IllegalStateException("Closed");
}
@Override
protected Owned<Hits<T>> prepareSend() {
var results = this.results;
var totalHitsCount = this.totalHitsCount;
var onClose = this.onClose;
return drop -> {
var instance = new Hits<>(results, totalHitsCount, onClose);
drop.attach(instance);
return instance;
};
}
protected void makeInaccessible() {
this.results = null;
this.totalHitsCount = null;
this.onClose = null;
}
}