Create a Benchmark test for NetworkStats.

/*

 * Copyright (C) 2015 The Android Open Source Project

 *

 * Licensed under the Apache License, Version 2.0 (the "License");

 * you may not use this file except in compliance with the License.

 * You may obtain a copy of the License at

 *

 *      http://www.apache.org/licenses/LICENSE-2.0

 *

 * Unless required by applicable law or agreed to in writing, software

 * distributed under the License is distributed on an "AS IS" BASIS,

 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.

 * See the License for the specific language governing permissions and

 * limitations under the License

 */

package android.net;

import com.google.caliper.Param;

import com.google.caliper.SimpleBenchmark;

public class NetworkStatsBenchmark extends SimpleBenchmark {

    private static final String UNDERLYING_IFACE = "wlan0";

    private static final String TUN_IFACE = "tun0";

    private static final int TUN_UID = 999999999;

    @Param({"100", "1000"})

    private int mSize;

    private NetworkStats mNetworkStats;

    @Override

    protected void setUp() throws Exception {

        super.setUp();

        mNetworkStats = new NetworkStats(0, mSize + 2);

        int uid = 0;

        NetworkStats.Entry recycle = new NetworkStats.Entry();

        for (int i = 0; i < mSize; i++) {

            recycle.iface = (i < mSize / 2) ? TUN_IFACE : UNDERLYING_IFACE;

            recycle.uid = uid;

            recycle.set = i % 2;

            recycle.tag = NetworkStats.TAG_NONE;

            recycle.rxBytes = 60000;

            recycle.rxPackets = 60;

            recycle.txBytes = 150000;

            recycle.txPackets = 1500;

            recycle.operations = 0;

            mNetworkStats.addValues(recycle);

            if (recycle.set == 1) {

                uid++;

            }

        }

        recycle.iface = UNDERLYING_IFACE;

        recycle.uid = TUN_UID;

        recycle.set = NetworkStats.SET_FOREGROUND;

        recycle.tag = NetworkStats.TAG_NONE;

        recycle.rxBytes = 90000 * mSize;

        recycle.rxPackets = 40 * mSize;

        recycle.txBytes = 180000 * mSize;

        recycle.txPackets = 1200 * mSize;

        recycle.operations = 0;

        mNetworkStats.addValues(recycle);

    }

    public void timeMigrateTun(int reps) {

        for (int i = 0; i < reps; i++) {

            NetworkStats stats = mNetworkStats.clone();

            stats.migrateTun(TUN_UID, TUN_IFACE, UNDERLYING_IFACE);

        }

    }

    /**

     * Since timeMigrateTun() includes a clone() call on the NetworkStats object,

     * we need to measure the cost of the clone() call itself in order to get more

     * accurate measurement on the migrateTun() method.

     */

    public void timeClone(int reps) {

        for (int i = 0; i < reps; i++) {

            NetworkStats stats = mNetworkStats.clone();

        }

    }

}