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.Supplier;
  
  import com.codahale.metrics.Snapshot;
  import org.apache.cassandra.metrics.LogLinearHistogram.LogLinearSnapshot;
  
  import static org.apache.cassandra.metrics.CassandraReservoir.BucketStrategy.log_linear;
  
  public class OnDemandHistogram extends OverrideHistogram
  {
      final Supplier<LogLinearSnapshot> snapshot;
      protected OnDemandHistogram(Supplier<LogLinearSnapshot> snapshot)
      {
          this.snapshot = snapshot;
      }
  
      @Override
      public synchronized long getCount()
      {
          return snapshot.get().totalCount;
      }
  
      @Override
      public Snapshot getSnapshot()
      {
          return snapshot.get();
      }
  
      @Override
      public CassandraReservoir.BucketStrategy bucketStrategy()
      {
          return log_linear;
      }
  
      @Override
      public long[] bucketStarts(int length)
      {
          return LogLinearHistogram.bucketsWithLength(length);
      }
  }
  