content: /*
   * The Alluxio Open Foundation licenses this work under the Apache License, version 2.0
   * (the "License"). You may not use this work except in compliance with the License, which is
   * available at www.apache.org/licenses/LICENSE-2.0
   *
   * This software is distributed on an "AS IS" basis, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND,
   * either express or implied, as more fully set forth in the License.
   *
   * See the NOTICE file distributed with this work for information regarding copyright ownership.
   */
  
  package alluxio.metrics;
  
  import java.util.Map;
  import java.util.Set;
  
  /**
   * Interface for the aggregator that aggregates into a single value from the metrics of different
   * hosts.
   */
  public interface SingleValueAggregator extends MetricsAggregator {
  
    /**
     * Gets the aggregated value from the filtered metrics. The values of map will be the filtered
     * metrics using the {@link MetricsFilter} defined in {@link #getFilters()}.
     *
     * @param map a map of {@link MetricsFilter} to the set of metrics that it filter to
     * @return the aggregated value
     */
    long getValue(Map<MetricsFilter, Set<Metric>> map);
  }
  