2021-01-30 22:14:48 +01:00
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package it.cavallium.dbengine.database.collections;
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2020-12-07 22:15:18 +01:00
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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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2021-11-12 02:05:44 +01:00
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import it.cavallium.dbengine.database.UpdateReturnMode;
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2020-12-07 22:15:18 +01:00
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import org.jetbrains.annotations.Nullable;
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2021-01-30 10:52:14 +01:00
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import reactor.core.publisher.Mono;
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2020-12-07 22:15:18 +01:00
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2021-01-31 00:36:21 +01:00
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public class DatabaseLong implements LLKeyValueDatabaseStructure {
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2020-12-07 22:15:18 +01:00
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private final LLSingleton singleton;
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2021-01-31 00:36:21 +01:00
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public DatabaseLong(LLSingleton singleton) {
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2020-12-07 22:15:18 +01:00
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this.singleton = singleton;
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}
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2021-01-30 10:52:14 +01:00
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public Mono<Long> get(@Nullable LLSnapshot snapshot) {
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return singleton.get(snapshot).map(array -> {
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if (array.length == 4) {
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return (long) Ints.fromByteArray(array);
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} else {
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return Longs.fromByteArray(array);
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}
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});
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2020-12-07 22:15:18 +01:00
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}
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2021-11-12 02:05:44 +01:00
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public Mono<Long> incrementAndGet() {
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return incrementAnd(UpdateReturnMode.GET_NEW_VALUE);
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}
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public Mono<Long> getAndIncrement() {
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return incrementAnd(UpdateReturnMode.GET_OLD_VALUE);
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}
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private Mono<Long> incrementAnd(UpdateReturnMode updateReturnMode) {
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return singleton.update(prev -> {
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if (prev != null) {
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try (var prevBuf = prev.receive()) {
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var prevLong = prevBuf.readLong();
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var alloc = singleton.getAllocator();
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2021-11-12 02:52:42 +01:00
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var buf = alloc.allocate(Long.BYTES);
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buf.writeLong(prevLong + 1);
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return buf;
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2021-11-12 02:05:44 +01:00
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}
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} else {
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var alloc = singleton.getAllocator();
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2021-11-12 02:52:42 +01:00
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var buf = alloc.allocate(Long.BYTES);
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buf.writeLong(1);
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return buf;
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2021-11-12 02:05:44 +01:00
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}
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}, updateReturnMode).map(send -> {
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try (var buf = send.receive()) {
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return buf.readLong();
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}
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}).single();
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}
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2021-01-30 10:52:14 +01:00
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public Mono<Void> set(long value) {
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return singleton.set(Longs.toByteArray(value));
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2020-12-07 22:15:18 +01:00
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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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