1 /*

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

     3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

     4  *

     5  * This code is free software; you can redistribute it and/or modify it

     6  * under the terms of the GNU General Public License version 2 only, as

     7  * published by the Free Software Foundation.

     8  *

     9  * This code is distributed in the hope that it will be useful, but WITHOUT

    10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

    11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

    12  * version 2 for more details (a copy is included in the LICENSE file that

    13  * accompanied this code).

    14  *

    15  * You should have received a copy of the GNU General Public License version

    16  * 2 along with this work; if not, write to the Free Software Foundation,

    17  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

    18  *

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

    20  * or visit www.oracle.com if you need additional information or have any

    21  * questions.

    22  */

    23 package org.openjdk.bench.java.net;

    24 

    25 import org.openjdk.jmh.annotations.Benchmark;

    26 import org.openjdk.jmh.annotations.BenchmarkMode;

    27 import org.openjdk.jmh.annotations.Fork;

    28 import org.openjdk.jmh.annotations.Measurement;

    29 import org.openjdk.jmh.annotations.Mode;

    30 import org.openjdk.jmh.annotations.OutputTimeUnit;

    31 import org.openjdk.jmh.annotations.Scope;

    32 import org.openjdk.jmh.annotations.State;

    33 import org.openjdk.jmh.annotations.Warmup;

    34 

    35 import java.lang.reflect.Method;

    36 import java.net.InetAddress;

    37 import java.net.NetworkInterface;

    38 import java.util.concurrent.TimeUnit;

    39 

    40 /**

    41  * Assess time to perform native NetworkInterface lookups; uses

    42  * reflection to access both package-private isBoundInetAddress and

    43  * public getByInetAddress (to get comparable numbers)

    44  */

    45 @BenchmarkMode(Mode.Throughput)

    46 @OutputTimeUnit(TimeUnit.SECONDS)

    47 @State(Scope.Thread)

    48 @Fork(2)

    49 @Warmup(iterations = 5, time = 2)

    50 @Measurement(iterations = 10, time = 2)

    51 public class NetworkInterfaceLookup {

    52 

    53     static final InetAddress address = InetAddress.getLoopbackAddress();

    54 

    55     static final Method isBoundInetAddress_method;

    56 

    57     static final Method getByInetAddress_method;

    58 

    59     static {

    60         Method isBound = null;

    61         Method getByInet = null;

    62 

    63         try {

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

    65             isBound.setAccessible(true);

    66         } catch (Exception e) {

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

    68         }

    69 

    70         try {

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

    72         } catch (Exception e) {

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

    74         }

    75         isBoundInetAddress_method = isBound;

    76         getByInetAddress_method = getByInet;

    77     }

    78 

    79     @Benchmark

    80     public boolean bound() throws Exception {

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

    82     }

    83 

    84     @Benchmark

    85     public NetworkInterface getByInetAddress() throws Exception {

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

    87     }

    88 }