/*
    * Licensed to the Apache Software Foundation (ASF) under one or more
    * contributor license agreements.  See the NOTICE file distributed with
    * this work for additional information regarding copyright ownership.
    * The ASF licenses this file to You 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 org.apache.commons.monitoring.reporting.web.plugin.jvm.gauges;
  
  import org.apache.commons.monitoring.Role;
  import org.apache.commons.monitoring.configuration.Configuration;
  import org.apache.commons.monitoring.counters.Unit;
  import org.apache.commons.monitoring.gauges.Gauge;
  
  import java.lang.management.ManagementFactory;
  import java.lang.management.OperatingSystemMXBean;
  
  public class CPUGauge implements Gauge {
      public static final Role CPU = new Role("CPU", Unit.UNARY);
  
      private static final OperatingSystemMXBean SYSTEM_MX_BEAN = ManagementFactory.getOperatingSystemMXBean();
  
      @Override
      public Role role() {
          return CPU;
      }
  
      @Override
      public double value() {
          return SYSTEM_MX_BEAN.getSystemLoadAverage();
      }
  
      @Override
      public long period() {
          return Configuration.getInteger(Configuration.COMMONS_MONITORING_PREFIX + "gauge.cpu.period", 4000);
      }
  }