87 lines
2.8 KiB
Java
87 lines
2.8 KiB
Java
package it.cavallium.dbengine.database.collections;
|
|
|
|
import io.netty.buffer.ByteBuf;
|
|
import io.netty.util.ReferenceCounted;
|
|
import it.cavallium.dbengine.client.CompositeSnapshot;
|
|
import it.cavallium.dbengine.database.LLDictionary;
|
|
import it.cavallium.dbengine.database.serialization.Serializer;
|
|
import it.cavallium.dbengine.database.serialization.SerializerFixedBinaryLength;
|
|
import java.util.Map;
|
|
import org.jetbrains.annotations.Nullable;
|
|
import reactor.core.publisher.Flux;
|
|
import reactor.core.publisher.Mono;
|
|
|
|
public class SubStageGetterMap<T, U> implements SubStageGetter<Map<T, U>, DatabaseMapDictionary<T, U>> {
|
|
|
|
private static final boolean assertsEnabled;
|
|
static {
|
|
boolean assertsEnabledTmp = false;
|
|
//noinspection AssertWithSideEffects
|
|
assert assertsEnabledTmp = true;
|
|
//noinspection ConstantConditions
|
|
assertsEnabled = assertsEnabledTmp;
|
|
}
|
|
|
|
private final SerializerFixedBinaryLength<T, ByteBuf> keySerializer;
|
|
private final Serializer<U, ByteBuf> valueSerializer;
|
|
|
|
public SubStageGetterMap(SerializerFixedBinaryLength<T, ByteBuf> keySerializer,
|
|
Serializer<U, ByteBuf> valueSerializer) {
|
|
this.keySerializer = keySerializer;
|
|
this.valueSerializer = valueSerializer;
|
|
}
|
|
|
|
@Override
|
|
public Mono<DatabaseMapDictionary<T, U>> subStage(LLDictionary dictionary,
|
|
@Nullable CompositeSnapshot snapshot,
|
|
ByteBuf prefixKey,
|
|
Flux<ByteBuf> debuggingKeyFlux) {
|
|
return Mono
|
|
.using(
|
|
() -> true,
|
|
b -> Mono
|
|
.fromSupplier(() -> DatabaseMapDictionary.tail(dictionary, prefixKey.retain(), keySerializer, valueSerializer))
|
|
.doOnDiscard(DatabaseMapDictionary.class, DatabaseMapDictionary::release)
|
|
.transformDeferred(result -> {
|
|
if (assertsEnabled) {
|
|
return this
|
|
.checkKeyFluxConsistency(prefixKey.retain(), debuggingKeyFlux)
|
|
.then(result);
|
|
} else {
|
|
return debuggingKeyFlux
|
|
.flatMap(buf -> Mono.fromRunnable(buf::release))
|
|
.doOnDiscard(ByteBuf.class, ReferenceCounted::release)
|
|
.then(result);
|
|
}
|
|
})
|
|
.doOnDiscard(DatabaseMapDictionary.class, DatabaseMapDictionary::release),
|
|
b -> prefixKey.release()
|
|
);
|
|
}
|
|
|
|
@Override
|
|
public boolean isMultiKey() {
|
|
return true;
|
|
}
|
|
|
|
@Override
|
|
public boolean needsDebuggingKeyFlux() {
|
|
return assertsEnabled;
|
|
}
|
|
|
|
private Mono<Void> checkKeyFluxConsistency(ByteBuf prefixKey, Flux<ByteBuf> keyFlux) {
|
|
return keyFlux
|
|
.doOnNext(key -> {
|
|
assert key.readableBytes() == prefixKey.readableBytes() + getKeyBinaryLength();
|
|
})
|
|
.flatMap(key -> Mono.fromRunnable(key::release))
|
|
.doOnDiscard(ByteBuf.class, ReferenceCounted::release)
|
|
.then()
|
|
.doFinally(s -> prefixKey.release());
|
|
}
|
|
|
|
public int getKeyBinaryLength() {
|
|
return keySerializer.getSerializedBinaryLength();
|
|
}
|
|
}
|