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 org.apache.ambari.server.controller.metrics;
  
  import static org.apache.ambari.server.controller.utilities.PropertyHelper.AGGREGATE_FUNCTION_IDENTIFIERS;
  
  import java.util.Collections;
  import java.util.HashSet;
  import java.util.Set;
  
  import org.apache.hadoop.metrics2.sink.timeline.TimelineMetric;
  
  public class MetricsDataTransferMethodFactory {
    private static final Set<String> PERCENTAGE_METRIC;
  
    static {
      Set<String> percentMetrics = new HashSet<>();
      percentMetrics.add("cpu_wio");
      percentMetrics.add("cpu_idle");
      percentMetrics.add("cpu_nice");
      percentMetrics.add("cpu_aidle");
      percentMetrics.add("cpu_system");
      percentMetrics.add("cpu_user");
  
      Set<String> metricsWithAggregateFunctionIds = new HashSet<>();
      for (String metric : percentMetrics) {
        for (String aggregateFunctionId : AGGREGATE_FUNCTION_IDENTIFIERS) {
          if (!"._sum".equals(aggregateFunctionId)) {
            metricsWithAggregateFunctionIds.add(metric + aggregateFunctionId);
          }
        }
      }
  
      percentMetrics.addAll(metricsWithAggregateFunctionIds);
  
      PERCENTAGE_METRIC = Collections.unmodifiableSet(percentMetrics);
    }
  
    private static final MetricsDataTransferMethod percentageAdjustment = new PercentageAdjustmentTransferMethod();
    private static final MetricsDataTransferMethod passThrough = new PassThroughTransferMethod();
  
    public static MetricsDataTransferMethod detectDataTransferMethod(TimelineMetric metricDecl) {
      if (PERCENTAGE_METRIC.contains(metricDecl.getMetricName())) {
        return percentageAdjustment;
      } else {
        return passThrough;
      }
    }
  }
  
  class PercentageAdjustmentTransferMethod extends MetricsDataTransferMethod {
  
    @Override
    public Double getData(Double data) {
      return data < 100 ? data : data / 100 ;
    }
  }
  
  class PassThroughTransferMethod extends MetricsDataTransferMethod {
  
    @Override
    public Double getData(Double data) {
      return data;
    }
  }
  