CavalliumDBEngine/src/example/java/it.cavallium.dbengine.client/Example.java
2021-01-31 15:59:21 +01:00

61 lines
2.8 KiB
Java

package it.cavallium.dbengine.client;
import io.netty.buffer.Unpooled;
import it.cavallium.dbengine.database.Column;
import it.cavallium.dbengine.database.collections.DatabaseMapDictionary;
import it.cavallium.dbengine.database.collections.FixedLengthSerializer;
import it.cavallium.dbengine.database.collections.SubStageGetterSingle;
import it.cavallium.dbengine.database.disk.LLLocalDatabaseConnection;
import java.nio.file.Path;
import java.time.Duration;
import java.time.Instant;
import java.util.Arrays;
import java.util.List;
import java.util.concurrent.atomic.AtomicInteger;
import reactor.core.publisher.Mono;
import reactor.core.publisher.Sinks;
import reactor.core.publisher.Sinks.One;
public class Example {
public static void main(String[] args) {
System.out.println("Test");
var ssg = new SubStageGetterSingle();
var ser = FixedLengthSerializer.noop(4);
var itemKey = new byte[] {0, 1, 2, 3};
var newValue = new byte[] {4, 5, 6, 7};
var itemKeyBuffer = Unpooled.wrappedBuffer(itemKey);
One<Instant> instantFirst = Sinks.one();
One<Instant> instantSecond = Sinks.one();
One<Instant> instantThird = Sinks.one();
AtomicInteger ai = new AtomicInteger(0);
new LLLocalDatabaseConnection(Path.of("/tmp/"), true)
.connect()
.flatMap(conn -> conn.getDatabase("testdb", List.of(Column.dictionary("testmap")), false))
.flatMap(db -> db.getDictionary("testmap"))
.map(dictionary -> new DatabaseMapDictionary<>(dictionary, ssg, ser, 10))
.flatMapMany(map -> Mono
.defer(() -> Mono
.fromRunnable(() -> System.out.println("Setting new value at key " + Arrays.toString(itemKey) + ": " + Arrays.toString(newValue)))
.doOnSuccess(s -> instantFirst.tryEmitValue(Instant.now()))
.flatMap(s -> map.at(null, itemKeyBuffer))
.doOnSuccess(s -> instantSecond.tryEmitValue(Instant.now()))
.flatMap(handle -> handle.setAndGetPrevious(newValue))
.doOnSuccess(s -> instantThird.tryEmitValue(Instant.now()))
.doOnSuccess(oldValue -> System.out.println("Old value: " + (oldValue == null ? "None" : Arrays.toString(oldValue))))
.then(Mono.zip(instantFirst.asMono(), instantSecond.asMono(), instantThird.asMono()))
.doOnSuccess(s -> {
var dur1 = Duration.between(s.getT1(), s.getT2());
var dur2 = Duration.between(s.getT2(), s.getT3());
var durtot = Duration.between(s.getT1(), s.getT3());
System.out.println("Iteration " + ai.incrementAndGet());
System.out.println("Time to get value reference: " + dur1.toMillisPart() + "ms " + dur1.toNanosPart() + "ns");
System.out.println("Time to set new value and get previous: " + dur2.toMillisPart() + "ms " + dur2.toNanosPart() + "ns");
System.out.println("(Total time) " + durtot.toMillisPart() + "ms " + durtot.toNanosPart() + "ns");
})
)
.repeat(100)
)
.blockLast();
}
}