CpuManagement.java

/*
 * This file is part of Waarp Project (named also Waarp or GG).
 *
 *  Copyright (c) 2019, Waarp SAS, and individual contributors by the @author
 *  tags. See the COPYRIGHT.txt in the distribution for a full listing of
 * individual contributors.
 *
 *  All Waarp Project is free software: you can redistribute it and/or
 * modify it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or (at your
 * option) any later version.
 *
 * Waarp 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 for more details.
 *
 *  You should have received a copy of the GNU General Public License along with
 * Waarp . If not, see <http://www.gnu.org/licenses/>.
 */
package org.waarp.common.cpu;

import java.lang.management.ManagementFactory;
import java.lang.management.OperatingSystemMXBean;

/**
 *
 */
class CpuManagement implements CpuManagementInterface {
  OperatingSystemMXBean osBean;

  /**
   * @throws UnsupportedOperationException if System Load Average is
   *     not
   *     supported
   */
  public CpuManagement() throws UnsupportedOperationException {
    osBean = ManagementFactory.getOperatingSystemMXBean();
    if (osBean.getSystemLoadAverage() < 0) {
      osBean = null;
      throw new UnsupportedOperationException(
          "System Load Average not supported");
    }
  }

  /**
   * @return the load average
   */
  @Override
  public double getLoadAverage() {
    return osBean.getSystemLoadAverage();
  }
}