Minestom/jmh-benchmarks/src/jmh/java/net/minestom/server/event/SingleNodeBenchmark.java

package net.minestom.server.event;

import org.openjdk.jmh.annotations.*;

import java.util.concurrent.TimeUnit;

@Warmup(iterations = 5, time = 1000, timeUnit = TimeUnit.MILLISECONDS)
@Measurement(iterations = 10, time = 1000, timeUnit = TimeUnit.MILLISECONDS)
@Fork(3)
@BenchmarkMode(Mode.AverageTime)
@OutputTimeUnit(TimeUnit.NANOSECONDS)
@State(Scope.Benchmark)
public class SingleNodeBenchmark {

    @Param({"0", "1", "2", "3", "5", "10"})
    public int listenerCount;

    private EventNode<Event> node;
    private ListenerHandle<TestEvent> handle;

    record TestEvent() implements Event {
    }

    record TestEvent2() implements Event {
    }

    @Setup
    public void setup() {
        node = EventNode.all("node");
        for (int i = 0; i < listenerCount; i++) {
            node.addListener(TestEvent.class, e -> {
                // Empty
            });
        }
        // Real-world code are very unlikely to use entirely empty nodes.
        // This ensures that the handle map is properly lazily initialized to prevent fast exits.
        node.addListener(TestEvent2.class, e -> {
            // Empty
        });
        node.call(new TestEvent2());

        this.handle = node.getHandle(TestEvent.class);
    }

    @Benchmark
    public void call() {
        node.call(new TestEvent());
    }

    @Benchmark
    public void handleCall() {
        handle.call(new TestEvent());
    }
}