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.cassandra.metrics;
  
  import java.util.function.LongUnaryOperator;
  
  import com.codahale.metrics.Snapshot;
  
  /**
   * A reservoir that scales the values before updating.
   */
  public class ScalingReservoir implements CassandraReservoir
  {
      private final CassandraReservoir delegate;
      private final LongUnaryOperator scaleFunc;
  
      public ScalingReservoir(CassandraReservoir reservoir, LongUnaryOperator scaleFunc)
      {
          this.delegate = reservoir;
          this.scaleFunc = scaleFunc;
      }
  
      @Override
      public int size()
      {
          return delegate.size();
      }
  
      @Override
      public void update(long value)
      {
          delegate.update(scaleFunc.applyAsLong(value));
      }
  
      @Override
      public Snapshot getSnapshot()
      {
          return delegate.getSnapshot();
      }
  
      @Override
      public Snapshot getPercentileSnapshot()
      {
          return delegate.getPercentileSnapshot();
      }
  
      @Override
      public BucketStrategy bucketStrategy()
      {
          return delegate.bucketStrategy();
      }
  
      @Override
      public long[] buckets(int length)
      {
          return delegate.buckets(length);
      }
  }
  