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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 *
 * This code is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 only, as
 * published by the Free Software Foundation.
 *
 * This code is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * 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
 * accompanied this code).
 *
 * You should have received a copy of the GNU General Public License version
 * 2 along with this work; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
 *
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package org.openjdk.bench.java.lang.ref;

import java.lang.ref.*;
import java.util.concurrent.TimeUnit;
import org.openjdk.jmh.annotations.*;
import org.openjdk.jmh.infra.Blackhole;

@OutputTimeUnit(TimeUnit.NANOSECONDS)
@State(Scope.Thread)
@BenchmarkMode(Mode.AverageTime)
@Warmup(iterations = 3, time = 1, timeUnit = TimeUnit.SECONDS)
@Measurement(iterations = 3, time = 1, timeUnit = TimeUnit.SECONDS)
@Fork(3)
public class ReferenceClear {

    final Reference<Object> soft = new SoftReference<>(new Object());
    final Reference<Object> weak = new WeakReference<>(new Object());
    final Reference<Object> phantom = new PhantomReference<>(new Object(), null);

    @Benchmark
    public void soft() {
       soft.clear();
    }

    @Benchmark
    public void soft_new(Blackhole bh) {
       Object ref = new Object();
       bh.consume(ref);
       Reference<Object> soft = new SoftReference<>(ref);
       soft.clear();
    }

    @Benchmark
    public void weak() {
       weak.clear();
    }

    @Benchmark
    public void weak_new(Blackhole bh) {
       Object ref = new Object();
       bh.consume(ref);
       Reference<Object> weak = new WeakReference<>(ref);
       weak.clear();
    }

    @Benchmark
    public void phantom() {
       phantom.clear();
    }

    @Benchmark
    public void phantom_new(Blackhole bh) {
       Object ref = new Object();
       bh.consume(ref);
       Reference<Object> phantom = new PhantomReference<>(ref, null);
       phantom.clear();
    }

}