60 lines
1.7 KiB
Java
60 lines
1.7 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.LLDictionary;
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import it.cavallium.dbengine.database.serialization.Serializer;
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import java.util.Arrays;
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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 class SubStageGetterSingle<T> implements SubStageGetter<T, DatabaseStageEntry<T>> {
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private final Serializer<T, byte[]> serializer;
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public SubStageGetterSingle(Serializer<T, byte[]> serializer) {
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this.serializer = serializer;
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}
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@Override
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public Mono<DatabaseStageEntry<T>> subStage(LLDictionary dictionary,
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@Nullable CompositeSnapshot snapshot,
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byte[] keyPrefix,
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Flux<byte[]> keyFlux) {
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//System.out.println(Thread.currentThread() + "subStageGetterSingle1");
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return keyFlux
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.singleOrEmpty()
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.flatMap(key -> Mono
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.<DatabaseStageEntry<T>>fromCallable(() -> {
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//System.out.println(Thread.currentThread() + "subStageGetterSingle2");
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if (!Arrays.equals(keyPrefix, key)) {
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throw new IndexOutOfBoundsException("Found more than one element!");
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}
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return null;
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})
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)
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.then(Mono.fromSupplier(() -> {
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//System.out.println(Thread.currentThread() + "subStageGetterSingle3");
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return new DatabaseSingle<T>(dictionary,
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keyPrefix,
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serializer
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);
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}));
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}
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@Override
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public boolean needsKeyFlux() {
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return true;
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}
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//todo: temporary wrapper. convert the whole class to buffers
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private T deserialize(byte[] bytes) {
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return serializer.deserialize(bytes);
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}
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//todo: temporary wrapper. convert the whole class to buffers
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private byte[] serialize(T bytes) {
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return serializer.serialize(bytes);
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}
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}
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