text: /*
   * Licensed to Elasticsearch B.V. under one or more contributor
   * license agreements. See the NOTICE file distributed with
   * this work for additional information regarding copyright
   * ownership. Elasticsearch B.V. 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.
   */
  
  import _ from 'lodash';
  
  function Samples(max) {
    this.vals = {};
    this.max = max || Infinity;
    this.length = 0;
  }
  
  Samples.prototype.add = function (sample) {
    const vals = this.vals;
    const length = this.length = Math.min(this.length + 1, this.max);
  
    _.forOwn(sample, function (val, name) {
      if (val == null) val = null;
  
      if (!vals[name]) vals[name] = new Array(length);
      vals[name].unshift([Date.now(), val]);
      vals[name].length = length;
    });
  };
  
  Samples.prototype.toJSON = function () {
    return this.vals;
  };
  
  export default Samples;
  