105 lines
3.1 KiB
Java
105 lines
3.1 KiB
Java
package it.cavallium.dbengine.database.collections;
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import com.google.common.primitives.Ints;
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import com.google.common.primitives.Longs;
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import it.cavallium.dbengine.database.LLKeyValueDatabaseStructure;
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import it.cavallium.dbengine.database.LLSingleton;
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import it.cavallium.dbengine.database.LLSnapshot;
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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.SerializerFixedBinaryLength;
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import org.jetbrains.annotations.Nullable;
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import reactor.core.publisher.Mono;
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public class DatabaseLong implements LLKeyValueDatabaseStructure {
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private final LLSingleton singleton;
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private final SerializerFixedBinaryLength<Long> serializer;
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private final SerializerFixedBinaryLength<Integer> bugSerializer;
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public DatabaseLong(LLSingleton singleton) {
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this.singleton = singleton;
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this.serializer = SerializerFixedBinaryLength.longSerializer(singleton.getAllocator());
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this.bugSerializer = SerializerFixedBinaryLength.intSerializer(singleton.getAllocator());
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}
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public Mono<Long> get(@Nullable LLSnapshot snapshot) {
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var resultMono = singleton.get(snapshot);
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return Mono.usingWhen(resultMono,
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result -> Mono.fromSupplier(() -> {
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if (result.readableBytes() == 4) {
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return (long) (int) bugSerializer.deserialize(result);
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} else {
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return serializer.deserialize(result);
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}
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}),
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result -> Mono.fromRunnable(result::close)
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);
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}
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public Mono<Long> incrementAndGet() {
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return addAnd(1, UpdateReturnMode.GET_NEW_VALUE);
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}
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public Mono<Long> getAndIncrement() {
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return addAnd(1, UpdateReturnMode.GET_OLD_VALUE);
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}
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public Mono<Long> decrementAndGet() {
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return addAnd(-1, UpdateReturnMode.GET_NEW_VALUE);
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}
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public Mono<Long> getAndDecrement() {
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return addAnd(-1, UpdateReturnMode.GET_OLD_VALUE);
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}
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public Mono<Long> addAndGet(long count) {
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return addAnd(count, UpdateReturnMode.GET_NEW_VALUE);
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}
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public Mono<Long> getAndAdd(long count) {
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return addAnd(count, UpdateReturnMode.GET_OLD_VALUE);
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}
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private Mono<Long> addAnd(long count, UpdateReturnMode updateReturnMode) {
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var resultMono = singleton.update(prev -> {
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try (prev) {
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if (prev != null) {
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var prevLong = prev.readLong();
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var alloc = singleton.getAllocator();
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var buf = alloc.allocate(Long.BYTES);
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buf.writeLong(prevLong + count);
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return buf;
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} else {
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var alloc = singleton.getAllocator();
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var buf = alloc.allocate(Long.BYTES);
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buf.writeLong(count);
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return buf;
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}
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}
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}, updateReturnMode);
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return Mono.usingWhen(resultMono,
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result -> Mono.fromSupplier(result::readLong),
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result -> Mono.fromRunnable(result::close)
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).single();
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}
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public Mono<Void> set(long value) {
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return singleton.set(Mono.fromCallable(() -> {
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var buf = singleton.getAllocator().allocate(Long.BYTES);
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try {
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serializer.serialize(value, buf);
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} catch (Throwable ex) {
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buf.close();
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throw ex;
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}
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return buf;
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}));
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}
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@Override
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public String getDatabaseName() {
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return singleton.getDatabaseName();
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}
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}
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