76 lines
2.3 KiB
Java
76 lines
2.3 KiB
Java
package it.cavallium.dbengine.database.collections;
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import io.netty5.util.Resource;
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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.Delta;
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import it.cavallium.dbengine.database.LLUtils;
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import it.cavallium.dbengine.database.UpdateReturnMode;
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import it.cavallium.dbengine.database.serialization.SerializationFunction;
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import java.util.Objects;
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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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public interface DatabaseStage<T> extends DatabaseStageWithEntry<T>, Resource<DatabaseStage<T>> {
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Mono<T> get(@Nullable CompositeSnapshot snapshot);
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default Mono<T> getOrDefault(@Nullable CompositeSnapshot snapshot,
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Mono<T> defaultValue,
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boolean existsAlmostCertainly) {
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return get(snapshot).switchIfEmpty(defaultValue).single();
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}
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default Mono<T> getOrDefault(@Nullable CompositeSnapshot snapshot, Mono<T> defaultValue) {
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return getOrDefault(snapshot, defaultValue, false);
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}
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default Mono<Void> set(T value) {
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return this
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.setAndGetChanged(value)
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.then();
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}
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Mono<T> setAndGetPrevious(T value);
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default Mono<Boolean> setAndGetChanged(T value) {
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return this
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.setAndGetPrevious(value)
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.map(oldValue -> !Objects.equals(oldValue, value))
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.switchIfEmpty(Mono.fromSupplier(() -> value != null));
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}
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default Mono<T> update(SerializationFunction<@Nullable T, @Nullable T> updater,
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UpdateReturnMode updateReturnMode) {
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return this
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.updateAndGetDelta(updater)
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.transform(prev -> LLUtils.resolveDelta(prev, updateReturnMode));
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}
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Mono<Delta<T>> updateAndGetDelta(SerializationFunction<@Nullable T, @Nullable T> updater);
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default Mono<Void> clear() {
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return clearAndGetStatus().then();
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}
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Mono<T> clearAndGetPrevious();
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default Mono<Boolean> clearAndGetStatus() {
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return clearAndGetPrevious().map(Objects::nonNull).defaultIfEmpty(false);
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}
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/**
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* Count all the elements.
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* If it's a nested collection the count will include all the children recursively
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* @param fast true to return an approximate value
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*/
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Mono<Long> leavesCount(@Nullable CompositeSnapshot snapshot, boolean fast);
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default Mono<Boolean> isEmpty(@Nullable CompositeSnapshot snapshot) {
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return leavesCount(snapshot, false).map(size -> size <= 0);
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}
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Flux<BadBlock> badBlocks();
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}
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