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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
 * version 2 for more details (a copy is included in the LICENSE file that
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 *
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package org.openjdk.bench.java.lang.constant;

import org.openjdk.jmh.annotations.Benchmark;
import org.openjdk.jmh.annotations.BenchmarkMode;
import org.openjdk.jmh.annotations.Fork;
import org.openjdk.jmh.annotations.Measurement;
import org.openjdk.jmh.annotations.Mode;
import org.openjdk.jmh.annotations.OutputTimeUnit;
import org.openjdk.jmh.annotations.Scope;
import org.openjdk.jmh.annotations.State;
import org.openjdk.jmh.annotations.Warmup;

import java.lang.constant.ClassDesc;
import java.lang.invoke.MethodHandles;
import java.util.concurrent.TimeUnit;

import static java.lang.constant.ConstantDescs.*;

/**
 * Measure the throughput of {@link ClassDesc#resolveConstantDesc} for different
 * reference types.
 */
@BenchmarkMode(Mode.Throughput)
@OutputTimeUnit(TimeUnit.MILLISECONDS)
@Warmup(iterations = 3, time = 2)
@Measurement(iterations = 6, time = 1)
@Fork(1)
@State(Scope.Thread)
public class ReferenceClassDescResolve {
    private static final MethodHandles.Lookup LOOKUP = MethodHandles.lookup();
    private static final ClassDesc CLASS_OR_INTERFACE = CD_String;
    private static final ClassDesc REFERENCE_ARRAY = CD_Integer.arrayType(2);
    private static final ClassDesc PRIMITIVE_ARRAY = CD_int.arrayType(3);

    @Benchmark
    public Class<?> resolveClassOrInterface() throws ReflectiveOperationException {
        return CLASS_OR_INTERFACE.resolveConstantDesc(LOOKUP);
    }

    @Benchmark
    public Class<?> resolveReferenceArray() throws ReflectiveOperationException {
        return REFERENCE_ARRAY.resolveConstantDesc(LOOKUP);
    }

    @Benchmark
    public Class<?> resolvePrimitiveArray() throws ReflectiveOperationException {
        return PRIMITIVE_ARRAY.resolveConstantDesc(LOOKUP);
    }
}