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.beam.sdk.metrics;
  
  import org.apache.beam.sdk.util.HistogramData;
  
  /** A metric that reports information about the histogram of reported values. */
  public interface Histogram extends Metric {
    /** Add an observation to this histogram. */
    void update(double value);
  
    /** Add observations to this histogram. */
    default void update(double... values) {
      for (double value : values) {
        update(value);
      }
    }
  
    /** Add a histogram to this histogram. Requires underlying implementation to implement this */
    default void update(HistogramData data) {}
  }
  