277 lines
9.4 KiB
Java
277 lines
9.4 KiB
Java
package it.cavallium.dbengine.database.collections;
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import it.cavallium.dbengine.client.CompositeSnapshot;
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import it.cavallium.dbengine.database.Delta;
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import it.cavallium.dbengine.database.LLUtils;
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import it.cavallium.dbengine.database.SubStageEntry;
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import it.cavallium.dbengine.database.UpdateMode;
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import it.cavallium.dbengine.database.UpdateReturnMode;
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import it.cavallium.dbengine.database.serialization.KVSerializationFunction;
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import it.cavallium.dbengine.database.serialization.SerializationException;
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import it.cavallium.dbengine.database.serialization.SerializationFunction;
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import it.unimi.dsi.fastutil.objects.Object2ObjectLinkedOpenHashMap;
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import it.unimi.dsi.fastutil.objects.Object2ObjectSortedMap;
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import it.unimi.dsi.fastutil.objects.Object2ObjectSortedMaps;
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import java.util.Map;
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import java.util.Map.Entry;
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import java.util.Objects;
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import java.util.Optional;
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import java.util.function.Function;
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import org.jetbrains.annotations.Nullable;
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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.Tuple2;
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import reactor.util.function.Tuples;
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@SuppressWarnings("unused")
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public interface DatabaseStageMap<T, U, US extends DatabaseStage<U>> extends
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DatabaseStageEntry<Object2ObjectSortedMap<T, U>> {
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Mono<US> at(@Nullable CompositeSnapshot snapshot, T key);
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default Mono<Boolean> containsKey(@Nullable CompositeSnapshot snapshot, T key) {
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return Mono.usingWhen(this.at(snapshot, key),
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stage -> stage.isEmpty(snapshot).map(empty -> !empty),
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LLUtils::finalizeResource
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);
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}
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default Mono<U> getValue(@Nullable CompositeSnapshot snapshot, T key) {
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return Mono.usingWhen(this.at(snapshot, key),
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stage -> stage.get(snapshot),
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LLUtils::finalizeResource
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);
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}
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default Mono<U> getValueOrDefault(@Nullable CompositeSnapshot snapshot, T key, Mono<U> defaultValue) {
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return getValue(snapshot, key).switchIfEmpty(defaultValue).single();
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}
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default Mono<Void> putValue(T key, U value) {
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return Mono.usingWhen(at(null, key).single(), stage -> stage.set(value), LLUtils::finalizeResource);
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}
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UpdateMode getUpdateMode();
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default Mono<U> updateValue(T key,
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UpdateReturnMode updateReturnMode,
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SerializationFunction<@Nullable U, @Nullable U> updater) {
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return Mono.usingWhen(at(null, key).single(),
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stage -> stage.update(updater, updateReturnMode),
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LLUtils::finalizeResource
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);
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}
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default Flux<Boolean> updateMulti(Flux<T> keys, KVSerializationFunction<T, @Nullable U, @Nullable U> updater) {
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return keys.flatMapSequential(key -> this.updateValue(key, prevValue -> updater.apply(key, prevValue)));
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}
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default Mono<Boolean> updateValue(T key, SerializationFunction<@Nullable U, @Nullable U> updater) {
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return updateValueAndGetDelta(key, updater).map(delta -> LLUtils.isDeltaChanged(delta)).single();
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}
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default Mono<Delta<U>> updateValueAndGetDelta(T key,
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SerializationFunction<@Nullable U, @Nullable U> updater) {
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var stageMono = this.at(null, key).single();
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return stageMono.flatMap(stage -> stage
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.updateAndGetDelta(updater)
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.doFinally(s -> stage.close()));
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}
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default Mono<U> putValueAndGetPrevious(T key, U value) {
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return Mono.usingWhen(at(null, key).single(),
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stage -> stage.setAndGetPrevious(value),
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LLUtils::finalizeResource
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);
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}
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/**
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* @return true if the key was associated with any value, false if the key didn't exist.
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*/
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default Mono<Boolean> putValueAndGetChanged(T key, U value) {
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return Mono
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.usingWhen(at(null, key).single(), stage -> stage.setAndGetChanged(value), LLUtils::finalizeResource)
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.single();
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}
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default Mono<Void> remove(T key) {
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return removeAndGetStatus(key).then();
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}
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default Mono<U> removeAndGetPrevious(T key) {
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return Mono.usingWhen(at(null, key), us -> us.clearAndGetPrevious(), LLUtils::finalizeResource);
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}
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default Mono<Boolean> removeAndGetStatus(T key) {
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return removeAndGetPrevious(key).map(o -> true).defaultIfEmpty(false);
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}
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/**
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* GetMulti must return the elements in sequence!
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*/
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default Flux<Optional<U>> getMulti(@Nullable CompositeSnapshot snapshot, Flux<T> keys) {
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return keys.flatMapSequential(key -> this
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.getValue(snapshot, key)
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.map(Optional::of)
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.defaultIfEmpty(Optional.empty())
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);
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}
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default Mono<Void> putMulti(Flux<Entry<T, U>> entries) {
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return entries.flatMap(entry -> this.putValue(entry.getKey(), entry.getValue())).then();
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}
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Flux<SubStageEntry<T, US>> getAllStages(@Nullable CompositeSnapshot snapshot, boolean smallRange);
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default Flux<Entry<T, U>> getAllValues(@Nullable CompositeSnapshot snapshot, boolean smallRange) {
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return this
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.getAllStages(snapshot, smallRange)
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.flatMapSequential(stage -> stage
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.getValue()
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.get(snapshot)
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.map(value -> Map.entry(stage.getKey(), value))
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.doFinally(s -> stage.getValue().close())
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);
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}
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default Mono<Void> setAllValues(Flux<Entry<T, U>> entries) {
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return setAllValuesAndGetPrevious(entries).then();
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}
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Flux<Entry<T, U>> setAllValuesAndGetPrevious(Flux<Entry<T, U>> entries);
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default Mono<Void> clear() {
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return setAllValues(Flux.empty());
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}
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default Mono<Void> replaceAllValues(boolean canKeysChange,
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Function<Entry<T, U>, Mono<Entry<T, U>>> entriesReplacer,
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boolean smallRange) {
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if (canKeysChange) {
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return this.setAllValues(this.getAllValues(null, smallRange).flatMap(entriesReplacer)).then();
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} else {
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return this
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.getAllValues(null, smallRange)
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.flatMap(entriesReplacer)
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.flatMap(replacedEntry -> this
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.at(null, replacedEntry.getKey())
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.flatMap(stage -> stage
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.set(replacedEntry.getValue())
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.doFinally(s -> stage.close())
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)
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)
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.then();
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}
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}
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default Mono<Void> replaceAll(Function<Entry<T, US>, Mono<Void>> entriesReplacer) {
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return this
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.getAllStages(null, false)
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.flatMap(stage -> entriesReplacer.apply(stage)
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.doFinally(s -> stage.getValue().close())
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)
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.then();
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}
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@Override
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default Mono<Object2ObjectSortedMap<T, U>> setAndGetPrevious(Object2ObjectSortedMap<T, U> value) {
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return this
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.setAllValuesAndGetPrevious(Flux.fromIterable(value.entrySet()))
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.collectMap(Entry::getKey, Entry::getValue, Object2ObjectLinkedOpenHashMap::new)
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.map(map -> (Object2ObjectSortedMap<T, U>) map)
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.filter(map -> !map.isEmpty());
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}
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@Override
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default Mono<Boolean> setAndGetChanged(Object2ObjectSortedMap<T, U> value) {
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return this
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.setAndGetPrevious(value)
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.map(oldValue -> !Objects.equals(oldValue, value.isEmpty() ? null : value))
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.switchIfEmpty(Mono.fromSupplier(() -> !value.isEmpty()));
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}
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@Override
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default Mono<Delta<Object2ObjectSortedMap<T, U>>> updateAndGetDelta(SerializationFunction<@Nullable Object2ObjectSortedMap<T, U>, @Nullable Object2ObjectSortedMap<T, U>> updater) {
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var updateMode = this.getUpdateMode();
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if (updateMode == UpdateMode.ALLOW_UNSAFE) {
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return this
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.getAllValues(null, true)
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.collectMap(Entry::getKey, Entry::getValue, Object2ObjectLinkedOpenHashMap::new)
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.map(map -> (Object2ObjectSortedMap<T, U>) map)
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.single()
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.<Tuple2<Optional<Object2ObjectSortedMap<T, U>>, Optional<Object2ObjectSortedMap<T, U>>>>handle((v, sink) -> {
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if (v.isEmpty()) {
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v = null;
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}
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try {
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var result = updater.apply(v);
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if (result != null && result.isEmpty()) {
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result = null;
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}
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sink.next(Tuples.of(Optional.ofNullable(v), Optional.ofNullable(result)));
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} catch (SerializationException ex) {
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sink.error(ex);
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}
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})
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.flatMap(result -> Mono
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.justOrEmpty(result.getT2())
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.flatMap(values -> this.setAllValues(Flux.fromIterable(values.entrySet())))
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.thenReturn(new Delta<>(result.getT1().orElse(null), result.getT2().orElse(null)))
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);
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} else if (updateMode == UpdateMode.ALLOW) {
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return Mono.fromCallable(() -> {
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throw new UnsupportedOperationException("Maps can't be updated atomically");
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});
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} else if (updateMode == UpdateMode.DISALLOW) {
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return Mono.fromCallable(() -> {
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throw new UnsupportedOperationException("Map can't be updated because updates are disabled");
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});
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} else {
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return Mono.fromCallable(() -> {
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throw new UnsupportedOperationException("Unknown update mode: " + updateMode);
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});
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}
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}
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@Override
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default Mono<Object2ObjectSortedMap<T, U>> clearAndGetPrevious() {
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return this.setAndGetPrevious(Object2ObjectSortedMaps.emptyMap());
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}
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@Override
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default Mono<Object2ObjectSortedMap<T, U>> get(@Nullable CompositeSnapshot snapshot) {
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return this
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.getAllValues(snapshot, true)
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.collectMap(Entry::getKey, Entry::getValue, Object2ObjectLinkedOpenHashMap::new)
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.map(map -> (Object2ObjectSortedMap<T, U>) map)
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.filter(map -> !map.isEmpty());
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}
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@Override
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default Mono<Long> leavesCount(@Nullable CompositeSnapshot snapshot, boolean fast) {
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return this
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.getAllStages(snapshot, false)
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.doOnNext(stage -> stage.getValue().close())
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.count();
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}
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/**
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* Value getter doesn't lock data. Please make sure to lock before getting data.
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*/
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default ValueGetterBlocking<T, U> getDbValueGetter(@Nullable CompositeSnapshot snapshot) {
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return k -> getValue(snapshot, k).transform(LLUtils::handleDiscard).block();
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}
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default ValueGetter<T, U> getAsyncDbValueGetter(@Nullable CompositeSnapshot snapshot) {
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return k -> getValue(snapshot, k);
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}
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default ValueTransformer<T, U> getAsyncDbValueTransformer(@Nullable CompositeSnapshot snapshot) {
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return keys -> {
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var sharedKeys = keys.publish().refCount(2);
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var values = DatabaseStageMap.this.getMulti(snapshot, sharedKeys);
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return Flux.zip(sharedKeys, values, Map::entry);
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};
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}
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}
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