66 lines
1.8 KiB
Java
66 lines
1.8 KiB
Java
package it.cavallium.dbengine.database.collections;
|
|
|
|
import io.netty.buffer.ByteBuf;
|
|
import it.cavallium.dbengine.client.CompositeSnapshot;
|
|
import it.cavallium.dbengine.database.LLDictionary;
|
|
import it.cavallium.dbengine.database.LLUtils;
|
|
import it.cavallium.dbengine.database.serialization.Serializer;
|
|
import java.util.Arrays;
|
|
import org.jetbrains.annotations.Nullable;
|
|
import reactor.core.publisher.Flux;
|
|
import reactor.core.publisher.Mono;
|
|
|
|
public class SubStageGetterSingle<T> implements SubStageGetter<T, DatabaseStageEntry<T>> {
|
|
|
|
private static final boolean assertsEnabled;
|
|
static {
|
|
boolean assertsEnabledTmp = false;
|
|
//noinspection AssertWithSideEffects
|
|
assert assertsEnabledTmp = true;
|
|
//noinspection ConstantConditions
|
|
assertsEnabled = assertsEnabledTmp;
|
|
}
|
|
|
|
private final Serializer<T, ByteBuf> serializer;
|
|
|
|
public SubStageGetterSingle(Serializer<T, ByteBuf> serializer) {
|
|
this.serializer = serializer;
|
|
}
|
|
|
|
@Override
|
|
public Mono<DatabaseStageEntry<T>> subStage(LLDictionary dictionary,
|
|
@Nullable CompositeSnapshot snapshot,
|
|
ByteBuf keyPrefix,
|
|
Flux<ByteBuf> debuggingKeyFlux) {
|
|
return debuggingKeyFlux
|
|
.singleOrEmpty()
|
|
.flatMap(key -> Mono
|
|
.<DatabaseStageEntry<T>>fromCallable(() -> {
|
|
try {
|
|
if (!LLUtils.equals(keyPrefix, key)) {
|
|
throw new IndexOutOfBoundsException("Found more than one element!");
|
|
}
|
|
} finally {
|
|
key.release();
|
|
}
|
|
return null;
|
|
})
|
|
)
|
|
.then(Mono
|
|
.<DatabaseStageEntry<T>>fromSupplier(() -> new DatabaseSingle<>(dictionary, keyPrefix.retain(), serializer))
|
|
)
|
|
.doFinally(s -> keyPrefix.release());
|
|
}
|
|
|
|
@Override
|
|
public boolean isMultiKey() {
|
|
return false;
|
|
}
|
|
|
|
@Override
|
|
public boolean needsDebuggingKeyFlux() {
|
|
return assertsEnabled;
|
|
}
|
|
|
|
}
|