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.master.metrics;
  
  import alluxio.metrics.TimeSeries;
  
  import com.google.common.collect.ImmutableList;
  
  import java.util.List;
  import java.util.Map;
  import java.util.concurrent.ConcurrentHashMap;
  import javax.annotation.concurrent.ThreadSafe;
  
  /**
   * An in-memory time series store for Alluxio metrics.
   */
  @ThreadSafe
  public class TimeSeriesStore {
    /** &lt;MetricName, TimeSeries&gt;. **/
    private final Map<String, TimeSeries> mTimeSeries;
  
    /**
     * Constructs a new time series store.
     */
    public TimeSeriesStore() {
      mTimeSeries = new ConcurrentHashMap<>();
    }
  
    /**
     * Records a value for the given metric at the current time.
     *
     * @param metric the name of the metric
     * @param value the value of the metric
     */
    public void record(String metric, double value) {
      mTimeSeries.compute(metric, (metricName, timeSeries) -> {
        if (timeSeries == null) {
          timeSeries = new TimeSeries(metricName);
        }
        timeSeries.record(value);
        return timeSeries;
      });
    }
  
    /**
     * @return a copy of all the time series data collected so far
     */
    public List<TimeSeries> getTimeSeries() {
      return ImmutableList.copyOf(mTimeSeries.values());
    }
  }
  