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 com.alibaba.metrics;
  
  /**
   * A statistically representative reservoir of a data stream.
   */
  public interface Reservoir {
      /**
       * Returns the number of values recorded.
       *
       * @return the number of values recorded
       */
      int size();
  
      /**
       * Adds a new recorded value to the reservoir.
       *
       * @param value a new recorded value
       */
      void update(long value);
  
      /**
       * Returns a snapshot of the reservoir's values.
       *
       * @return a snapshot of the reservoir's values
       */
      Snapshot getSnapshot();
  }
  