code: /*
   * Copyright © 2014-2017 EntIT Software LLC, a Micro Focus company (L.P.)
   *
   * 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 io.cloudslang.worker.monitor.metric;
  
  import io.cloudslang.worker.monitor.service.WorkerPerformanceMetric;
  import org.apache.commons.lang3.tuple.Pair;
  import oshi.SystemInfo;
  import oshi.software.os.OSProcess;
  import oshi.software.os.OperatingSystem;
  
  import java.io.Serializable;
  import java.math.BigDecimal;
  import java.math.RoundingMode;
  
  import static java.util.Objects.requireNonNull;
  
  public interface WorkerPerfMetric {
      Pair<WorkerPerformanceMetric, Serializable> measure(OSProcess crtProcess, OSProcess oldProcess);
  
      static double formatTo2Decimal(double value) {
          return new BigDecimal(value).setScale(2, RoundingMode.HALF_EVEN).doubleValue();
      }
  
      static OSProcess getProcess() {
          SystemInfo systemInfo = new SystemInfo();
          OperatingSystem operatingSystem = systemInfo.getOperatingSystem();
          int processId = operatingSystem.getProcessId();
          return requireNonNull(operatingSystem.getProcess(processId), "OSProcess is null");
      }
  }
  