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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.hardware.platform.linux;

import static oshi.util.Memoizer.memoize;

import java.util.function.Supplier;

import oshi.annotation.concurrent.Immutable;
import oshi.driver.linux.Devicetree;
import oshi.driver.linux.Dmidecode;
import oshi.driver.linux.Lshal;
import oshi.driver.linux.Lshw;
import oshi.driver.linux.Sysfs;
import oshi.driver.linux.proc.CpuInfo;
import oshi.hardware.Baseboard;
import oshi.hardware.Firmware;
import oshi.hardware.common.AbstractComputerSystem;
import oshi.util.Constants;

/**
 * Hardware data obtained from sysfs.
 */
@Immutable
final class LinuxComputerSystem extends AbstractComputerSystem {

    private final Supplier manufacturer = memoize(LinuxComputerSystem::queryManufacturer);

    private final Supplier model = memoize(LinuxComputerSystem::queryModel);

    private final Supplier serialNumber = memoize(LinuxComputerSystem::querySerialNumber);

    @Override
    public String getManufacturer() {
        return manufacturer.get();
    }

    @Override
    public String getModel() {
        return model.get();
    }

    @Override
    public String getSerialNumber() {
        return serialNumber.get();
    }

    @Override
    public Firmware createFirmware() {
        return new LinuxFirmware();
    }

    @Override
    public Baseboard createBaseboard() {
        return new LinuxBaseboard();
    }

    private static String queryManufacturer() {
        String result = null;
        if ((result = Sysfs.querySystemVendor()) == null && (result = CpuInfo.queryCpuManufacturer()) == null) {
            return Constants.UNKNOWN;
        }
        return result;
    }

    private static String queryModel() {
        String result = null;
        if ((result = Sysfs.queryProductModel()) == null && (result = Devicetree.queryModel()) == null
                && (result = Lshw.queryModel()) == null) {
            return Constants.UNKNOWN;
        }
        return result;
    }

    private static String querySerialNumber() {
        String result = null;
        if ((result = Sysfs.queryProductSerial()) == null && (result = Dmidecode.querySerialNumber()) == null
                && (result = Lshal.querySerialNumber()) == null && (result = Lshw.querySerialNumber()) == null) {
            return Constants.UNKNOWN;
        }
        return result;
    }
}