/*

 * Copyright (c) 2019, Oracle and/or its affiliates. All rights reserved.

 * 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.

 *

 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

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package org.openjdk.bench.java.net;

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.reflect.Method;

import java.net.InetAddress;

import java.net.NetworkInterface;

import java.util.concurrent.TimeUnit;

/**

 * Assess time to perform native NetworkInterface lookups; uses

 * reflection to access both package-private isBoundInetAddress and

 * public getByInetAddress (to get comparable numbers)

 */

@BenchmarkMode(Mode.Throughput)

@OutputTimeUnit(TimeUnit.SECONDS)

@State(Scope.Thread)

@Fork(2)

@Warmup(iterations = 5, time = 2)

@Measurement(iterations = 10, time = 2)

public class NetworkInterfaceLookup {

    static final InetAddress address = InetAddress.getLoopbackAddress();

    static final Method isBoundInetAddress_method;

    static final Method getByInetAddress_method;

    static {

        Method isBound = null;

        Method getByInet = null;

        try {

            isBound = NetworkInterface.class.getDeclaredMethod("isBoundInetAddress", InetAddress.class);

            isBound.setAccessible(true);

        } catch (Exception e) {

            System.out.println("NetworkInterface.isBoundInetAddress not found");

        }

        try {

            getByInet = NetworkInterface.class.getDeclaredMethod("getByInetAddress", InetAddress.class);

        } catch (Exception e) {

            System.out.println("NetworkInterface.getByInetAddress not found");

        }

        isBoundInetAddress_method = isBound;

        getByInetAddress_method = getByInet;

    }

    @Benchmark

    public boolean bound() throws Exception {

        return (boolean)isBoundInetAddress_method.invoke(null, address);

    }

    @Benchmark

    public NetworkInterface getByInetAddress() throws Exception {

        return (NetworkInterface)getByInetAddress_method.invoke(null, address);

    }

}