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.service.accord.events;
  
  import jdk.jfr.Category;
  import jdk.jfr.DataAmount;
  import jdk.jfr.Event;
  import jdk.jfr.Label;
  import jdk.jfr.Name;
  import jdk.jfr.Percentage;
  import jdk.jfr.StackTrace;
  
  @Category({"Accord", "Accord Cache"})
  @StackTrace(false)
  public abstract class CacheEvents extends Event
  {
      public int shard;
      public String instance;
      public String key;
      public String status;
      @DataAmount(DataAmount.BYTES)
      public int lastQueriedEstimatedSizeOnHeap;
  
      // instance
      @DataAmount(DataAmount.BYTES)
      public long instanceAllocated;
      public long instanceStatsHits, instanceStatsMisses;
  
      @Percentage
      public double instanceStatsHitRate;
  
      // cache
      @DataAmount(DataAmount.BYTES)
      public long globalCapacity, globalAllocated;
      public int globalSize, globalReferenced, globalUnreferenced;
  
      @Percentage
      public double globalFree;
      public void update()
      {
          instanceStatsHitRate =  1D - (instanceStatsHits / (double) (instanceStatsHits + instanceStatsMisses));
          globalFree =  1.0D - (globalAllocated / (double) globalCapacity);
      }
  
      @Name("cassandra.accord.cache.Add")
      @Label("Accord Cache Add")
      public static class Add extends CacheEvents { }
  
      @Name("cassandra.accord.cache.Release")
      @Label("Accord Cache Release")
      public static class Release extends CacheEvents { }
  
      @Name("cassandra.accord.cache.Evict")
      @Label("Accord Cache Evict")
      public static class Evict extends CacheEvents { }
  }
  