170 lines
5.1 KiB
Java
170 lines
5.1 KiB
Java
package it.cavallium.dbengine.database.collections;
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import io.net5.buffer.api.Buffer;
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import io.net5.buffer.api.Drop;
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import io.net5.buffer.api.Owned;
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import io.net5.buffer.api.Send;
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import io.net5.buffer.api.internal.ResourceSupport;
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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.LLDictionary;
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import it.cavallium.dbengine.database.LLDictionaryResultType;
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import it.cavallium.dbengine.database.LLRange;
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import it.cavallium.dbengine.database.LLSnapshot;
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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.SerializationException;
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import it.cavallium.dbengine.database.serialization.SerializationFunction;
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import it.cavallium.dbengine.database.serialization.Serializer;
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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.core.publisher.SynchronousSink;
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public class DatabaseSingle<U> extends ResourceSupport<DatabaseStage<U>, DatabaseSingle<U>> implements
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DatabaseStageEntry<U> {
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private final LLDictionary dictionary;
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private final Mono<Send<Buffer>> keyMono;
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private final Serializer<U> serializer;
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private Buffer key;
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public DatabaseSingle(LLDictionary dictionary, Send<Buffer> key, Serializer<U> serializer,
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Drop<DatabaseSingle<U>> drop) {
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super(new CloseOnDrop<>(drop));
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try (key) {
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this.dictionary = dictionary;
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this.key = key.receive();
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this.keyMono = LLUtils.lazyRetain(this.key);
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this.serializer = serializer;
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}
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}
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private LLSnapshot resolveSnapshot(@Nullable CompositeSnapshot snapshot) {
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if (snapshot == null) {
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return null;
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} else {
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return snapshot.getSnapshot(dictionary);
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}
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}
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private void deserializeValue(Send<Buffer> value, SynchronousSink<U> sink) {
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try (value) {
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sink.next(serializer.deserialize(value).deserializedData());
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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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@Override
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public Mono<U> get(@Nullable CompositeSnapshot snapshot, boolean existsAlmostCertainly) {
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return dictionary
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.get(resolveSnapshot(snapshot), keyMono, existsAlmostCertainly)
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.handle(this::deserializeValue);
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}
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@Override
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public Mono<U> setAndGetPrevious(U value) {
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return dictionary
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.put(keyMono, Mono.fromCallable(() -> serializer.serialize(value)), LLDictionaryResultType.PREVIOUS_VALUE)
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.handle(this::deserializeValue);
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}
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@Override
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public Mono<U> update(SerializationFunction<@Nullable U, @Nullable U> updater,
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UpdateReturnMode updateReturnMode,
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boolean existsAlmostCertainly) {
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return dictionary
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.update(keyMono, (oldValueSer) -> {
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try (oldValueSer) {
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var result = updater.apply(oldValueSer == null ? null
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: serializer.deserialize(oldValueSer).deserializedData());
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if (result == null) {
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return null;
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} else {
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return serializer.serialize(result);
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}
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}
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}, updateReturnMode, existsAlmostCertainly)
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.handle(this::deserializeValue);
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}
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@Override
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public Mono<Delta<U>> updateAndGetDelta(SerializationFunction<@Nullable U, @Nullable U> updater,
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boolean existsAlmostCertainly) {
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return dictionary
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.updateAndGetDelta(keyMono, (oldValueSer) -> {
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try (oldValueSer) {
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var result = updater.apply(oldValueSer == null ? null
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: serializer.deserialize(oldValueSer).deserializedData());
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if (result == null) {
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return null;
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} else {
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return serializer.serialize(result);
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}
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}
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}, existsAlmostCertainly).transform(mono -> LLUtils.mapLLDelta(mono,
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serialized -> serializer.deserialize(serialized).deserializedData()
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));
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}
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@Override
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public Mono<U> clearAndGetPrevious() {
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return dictionary
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.remove(keyMono, LLDictionaryResultType.PREVIOUS_VALUE)
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.handle(this::deserializeValue);
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}
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@Override
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public Mono<Long> leavesCount(@Nullable CompositeSnapshot snapshot, boolean fast) {
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return dictionary
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.isRangeEmpty(resolveSnapshot(snapshot), keyMono.map(LLRange::single).map(ResourceSupport::send))
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.map(empty -> empty ? 0L : 1L);
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}
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@Override
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public Mono<Boolean> isEmpty(@Nullable CompositeSnapshot snapshot) {
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return dictionary
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.isRangeEmpty(resolveSnapshot(snapshot), keyMono.map(LLRange::single).map(ResourceSupport::send));
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}
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@Override
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public Flux<BadBlock> badBlocks() {
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return dictionary.badBlocks(keyMono.map(LLRange::single).map(ResourceSupport::send));
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}
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@Override
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protected RuntimeException createResourceClosedException() {
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throw new IllegalStateException("Closed");
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}
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@Override
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protected Owned<DatabaseSingle<U>> prepareSend() {
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var key = this.key.send();
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return drop -> new DatabaseSingle<>(dictionary, key, serializer, drop);
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}
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@Override
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protected void makeInaccessible() {
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this.key = null;
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}
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private static class CloseOnDrop<U> implements Drop<DatabaseSingle<U>> {
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private final Drop<DatabaseSingle<U>> delegate;
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public CloseOnDrop(Drop<DatabaseSingle<U>> drop) {
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this.delegate = drop;
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}
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@Override
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public void drop(DatabaseSingle<U> obj) {
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if (obj.key != null) {
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obj.key.close();
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}
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delegate.drop(obj);
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}
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}
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} |