CavalliumDBEngine/src/main/java/it/cavallium/dbengine/database/collections/DatabaseSingleBucket.java

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package it.cavallium.dbengine.database.collections;
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import it.cavallium.dbengine.client.BadBlock;
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import it.cavallium.dbengine.client.CompositeSnapshot;
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import it.cavallium.dbengine.database.Column;
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import it.cavallium.dbengine.database.Delta;
import it.cavallium.dbengine.database.LLUtils;
import it.cavallium.dbengine.database.UpdateReturnMode;
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import it.cavallium.dbengine.database.serialization.SerializationFunction;
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import it.unimi.dsi.fastutil.objects.ObjectArraySet;
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import it.unimi.dsi.fastutil.objects.ObjectSets;
import java.util.HashSet;
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import java.util.Map;
import java.util.Map.Entry;
import java.util.Objects;
import java.util.Set;
import java.util.function.BiFunction;
import java.util.function.Function;
import org.jetbrains.annotations.NotNull;
import org.jetbrains.annotations.Nullable;
import org.warp.commonutils.functional.TriFunction;
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import reactor.core.publisher.Flux;
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import reactor.core.publisher.Mono;
@SuppressWarnings("unused")
public class DatabaseSingleBucket<K, V, TH> implements DatabaseStageEntry<V> {
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private final DatabaseStageEntry<ObjectArraySet<Entry<K, V>>> bucketStage;
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private final K key;
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public DatabaseSingleBucket(DatabaseStageEntry<ObjectArraySet<Entry<K, V>>> bucketStage, K key) {
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this.bucketStage = bucketStage;
this.key = key;
}
@Override
public Mono<V> get(@Nullable CompositeSnapshot snapshot, boolean existsAlmostCertainly) {
return bucketStage.get(snapshot, existsAlmostCertainly).flatMap(this::extractValueTransformation);
}
@Override
public Mono<V> getOrDefault(@Nullable CompositeSnapshot snapshot, Mono<V> defaultValue) {
return bucketStage.get(snapshot).flatMap(this::extractValueTransformation).switchIfEmpty(defaultValue);
}
@Override
public Mono<Void> set(V value) {
return this.update(prev -> value, UpdateReturnMode.NOTHING).then();
}
@Override
public Mono<V> setAndGetPrevious(V value) {
return this.update(prev -> value, UpdateReturnMode.GET_OLD_VALUE);
}
@Override
public Mono<Boolean> setAndGetChanged(V value) {
return this.updateAndGetDelta(prev -> value).map(LLUtils::isDeltaChanged);
}
@Override
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public Mono<V> update(SerializationFunction<@Nullable V, @Nullable V> updater,
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UpdateReturnMode updateReturnMode,
boolean existsAlmostCertainly) {
return bucketStage
.update(oldBucket -> {
V oldValue = extractValue(oldBucket);
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V newValue = updater.apply(oldValue);
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if (newValue == null) {
return this.removeValueOrDelete(oldBucket);
} else {
return this.insertValueOrCreate(oldBucket, newValue);
}
}, updateReturnMode, existsAlmostCertainly)
.flatMap(this::extractValueTransformation);
}
@Override
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public Mono<Delta<V>> updateAndGetDelta(SerializationFunction<@Nullable V, @Nullable V> updater, boolean existsAlmostCertainly) {
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return bucketStage
.updateAndGetDelta(oldBucket -> {
V oldValue = extractValue(oldBucket);
var result = updater.apply(oldValue);
if (result == null) {
return this.removeValueOrDelete(oldBucket);
} else {
return this.insertValueOrCreate(oldBucket, result);
}
}, existsAlmostCertainly)
.transform(mono -> LLUtils.mapDelta(mono, this::extractValue));
}
@Override
public Mono<Void> clear() {
return this.update(prev -> null, UpdateReturnMode.NOTHING).then();
}
@Override
public Mono<V> clearAndGetPrevious() {
return this.update(prev -> null, UpdateReturnMode.GET_OLD_VALUE);
}
@Override
public Mono<Boolean> clearAndGetStatus() {
return this.updateAndGetDelta(prev -> null).map(LLUtils::isDeltaChanged);
}
@Override
public Mono<Void> close() {
return bucketStage.close();
}
@Override
public Mono<Long> leavesCount(@Nullable CompositeSnapshot snapshot, boolean fast) {
return this.get(snapshot).map(prev -> 1L).defaultIfEmpty(0L);
}
@Override
public Mono<Boolean> isEmpty(@Nullable CompositeSnapshot snapshot) {
return this.get(snapshot).map(prev -> true).defaultIfEmpty(true);
}
@Override
public DatabaseStageEntry<V> entry() {
return this;
}
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@Override
public Flux<BadBlock> badBlocks() {
return bucketStage.badBlocks();
}
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@Override
public void release() {
bucketStage.release();
}
private Mono<V> extractValueTransformation(Set<Entry<K, V>> entries) {
return Mono.fromCallable(() -> extractValue(entries));
}
@Nullable
private V extractValue(Set<Entry<K, V>> entries) {
if (entries == null) return null;
for (Entry<K, V> entry : entries) {
if (Objects.equals(entry.getKey(), key)) {
return entry.getValue();
}
}
return null;
}
@NotNull
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private ObjectArraySet<Entry<K, V>> insertValueOrCreate(@Nullable ObjectArraySet<Entry<K, V>> entries, V value) {
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if (entries != null) {
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var clonedEntries = entries.clone();
var it = clonedEntries.iterator();
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while (it.hasNext()) {
var entry = it.next();
if (Objects.equals(entry.getKey(), key)) {
it.remove();
break;
}
}
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clonedEntries.add(Map.entry(key, value));
return clonedEntries;
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} else {
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var oas = new ObjectArraySet<Entry<K, V>>(1);
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oas.add(Map.entry(key, value));
return oas;
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}
}
@Nullable
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private ObjectArraySet<Entry<K, V>> removeValueOrDelete(@Nullable ObjectArraySet<Entry<K, V>> entries) {
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if (entries != null) {
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var clonedEntries = entries.clone();
var it = clonedEntries.iterator();
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while (it.hasNext()) {
var entry = it.next();
if (Objects.equals(entry.getKey(), key)) {
it.remove();
break;
}
}
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if (clonedEntries.size() == 0) {
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return null;
} else {
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return clonedEntries;
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}
} else {
return null;
}
}
}