content: /*
   * 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 com.alibaba.metrics.os.windows;
  
  import com.alibaba.metrics.CachedMetricSet;
  import com.alibaba.metrics.Metric;
  import com.alibaba.metrics.MetricName;
  import com.alibaba.metrics.PersistentGauge;
  
  import java.util.HashMap;
  import java.util.Map;
  import java.util.concurrent.TimeUnit;
  
  import static com.alibaba.metrics.os.utils.SystemInfoUtils.sigar;
  
  public class SystemLoadGaugeSet extends CachedMetricSet {
  
      private Map<MetricName, Metric> gauges;
  
      private enum LoadAvg {
          ONE_MIN, FIVE_MIN, FIFTEEN_MIN
      }
  
      private float[] loadAvg;
  
      public SystemLoadGaugeSet() {
          this(DEFAULT_DATA_TTL, TimeUnit.MILLISECONDS);
      }
  
      public SystemLoadGaugeSet(long dataTTL, TimeUnit unit) {
          super(dataTTL, unit);
          loadAvg = new float[LoadAvg.values().length];
      }
  
      @Override
      public Map<MetricName, Metric> getMetrics() {
          final Map<MetricName, Metric> gauges = new HashMap<MetricName, Metric>();
  
          gauges.put(MetricName.build("load.1min"), new PersistentGauge<Float>() {
              @Override
              public Float getValue() {
                  refreshIfNecessary();
                  return loadAvg[LoadAvg.ONE_MIN.ordinal()];
              }
          });
  
          gauges.put(MetricName.build("load.5min"), new PersistentGauge<Float>() {
              @Override
              public Float getValue() {
                  refreshIfNecessary();
                  return loadAvg[LoadAvg.FIVE_MIN.ordinal()];
              }
          });
  
          gauges.put(MetricName.build("load.15min"), new PersistentGauge<Float>() {
              @Override
              public Float getValue() {
                  refreshIfNecessary();
                  return loadAvg[LoadAvg.FIFTEEN_MIN.ordinal()];
              }
          });
  
          return gauges;
      }
  
      @Override
      protected void getValueInternal() {
          double[] load = null;
          try {
              load = sigar.getLoadAverage();
          } catch (Throwable e) {
              // ignore
          }
  
          if (load == null) {
              return;
          }
  
          if (load.length > 0){
              loadAvg[LoadAvg.ONE_MIN.ordinal()] = (float) load[0];
          }
  
          if (load.length > 1){
              loadAvg[LoadAvg.FIVE_MIN.ordinal()] = (float) load[1];
          }
  
          if (load.length > 2){
              loadAvg[LoadAvg.FIFTEEN_MIN.ordinal()] = (float) load[2];
          }
      }
  
  }
  