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A Shaded CQL ActivityType driver for http://nosqlbench.io/

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/**
 * MIT License
 *
 * Copyright (c) 2010 - 2020 The OSHI Project Contributors: https://github.com/oshi/oshi/graphs/contributors
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in all
 * copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 * SOFTWARE.
 */
package oshi.driver.unix;

import java.util.List;

import oshi.annotation.concurrent.ThreadSafe;
import oshi.util.ExecutingCommand;
import oshi.util.tuples.Pair;

/**
 * Utility to query TCP connections
 */
@ThreadSafe
public final class NetStatTcp {

    private NetStatTcp() {
    }

    /**
     * Query netstat to obtain number of established TCP connections
     *
     * @return A pair with number of established IPv4 and IPv6 connections
     */
    public static Pair queryTcpnetstat() {
        long tcp4 = 0L;
        long tcp6 = 0L;
        List activeConns = ExecutingCommand.runNative("netstat -n -p tcp");
        for (String s : activeConns) {
            if (s.endsWith("ESTABLISHED")) {
                if (s.startsWith("tcp4")) {
                    tcp4++;
                } else if (s.startsWith("tcp6")) {
                    tcp6++;
                }
            }
        }
        return new Pair<>(tcp4, tcp6);
    }
}