86 lines
2.6 KiB
Java
86 lines
2.6 KiB
Java
package it.cavallium.dbengine.database.collections;
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import io.netty.buffer.ByteBuf;
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import io.netty.util.ReferenceCounted;
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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 it.cavallium.dbengine.database.serialization.SerializerFixedBinaryLength;
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import java.util.List;
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import java.util.Map;
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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 SubStageGetterMap<T, U> implements SubStageGetter<Map<T, U>, DatabaseMapDictionary<T, U>> {
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private static final boolean assertsEnabled;
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static {
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boolean assertsEnabledTmp = false;
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//noinspection AssertWithSideEffects
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assert assertsEnabledTmp = true;
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//noinspection ConstantConditions
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assertsEnabled = assertsEnabledTmp;
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}
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private final SerializerFixedBinaryLength<T, ByteBuf> keySerializer;
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private final Serializer<U, ByteBuf> valueSerializer;
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private final boolean enableAssertionsWhenUsingAssertions;
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public SubStageGetterMap(SerializerFixedBinaryLength<T, ByteBuf> keySerializer,
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Serializer<U, ByteBuf> valueSerializer, boolean enableAssertionsWhenUsingAssertions) {
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this.keySerializer = keySerializer;
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this.valueSerializer = valueSerializer;
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this.enableAssertionsWhenUsingAssertions = enableAssertionsWhenUsingAssertions;
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}
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@Override
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public Mono<DatabaseMapDictionary<T, U>> subStage(LLDictionary dictionary,
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@Nullable CompositeSnapshot snapshot,
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Mono<ByteBuf> prefixKeyMono,
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Flux<ByteBuf> debuggingKeysFlux) {
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return Mono.usingWhen(prefixKeyMono,
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prefixKey -> Mono
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.fromSupplier(() -> DatabaseMapDictionary
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.tail(dictionary,
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prefixKey.retain(),
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keySerializer,
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valueSerializer
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)
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)
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.transform(mono -> {
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if (assertsEnabled && enableAssertionsWhenUsingAssertions) {
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return debuggingKeysFlux.handle((key, sink) -> {
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try {
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if (key.readableBytes() != prefixKey.readableBytes() + getKeyBinaryLength()) {
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sink.error(new IndexOutOfBoundsException());
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} else {
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sink.complete();
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}
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} finally {
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key.release();
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}
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}).then(mono);
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} else {
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return mono;
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}
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}),
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prefixKey -> Mono.fromRunnable(prefixKey::release)
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);
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}
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@Override
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public boolean isMultiKey() {
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return true;
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}
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@Override
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public boolean needsDebuggingKeyFlux() {
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return assertsEnabled && enableAssertionsWhenUsingAssertions;
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}
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public int getKeyBinaryLength() {
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return keySerializer.getSerializedBinaryLength();
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}
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}
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