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 com.codahale.metrics.Gauge;
  import org.apache.cassandra.cache.CacheSize;
  
  import static org.apache.cassandra.metrics.CacheMetrics.TYPE_NAME;
  import static org.apache.cassandra.metrics.CassandraMetricsRegistry.Metrics;
  
  public class CacheSizeMetrics
  {
      public static final String CAPACITY = "Capacity";
      public static final String SIZE = "Size";
      public static final String ENTRIES = "Entries";
      /**
       * Cache capacity in bytes
       */
      public final Gauge<Long> capacity;
  
      /**
       * Total size of cache, in bytes
       */
      public final Gauge<Long> size;
  
      /**
       * Total number of cache entries
       */
      public final Gauge<Integer> entries;
  
      /**
       * Create metrics for the given cache supporting entity.
       *
       * @param type  Type of Cache to identify metrics.
       * @param cache Cache to measure metrics
       */
      public CacheSizeMetrics(String type, CacheSize cache)
      {
          this(new DefaultNameFactory(TYPE_NAME, type), cache);
      }
  
      public CacheSizeMetrics(MetricNameFactory factory, CacheSize cache)
      {
          capacity = Metrics.register(factory.createMetricName(CAPACITY), cache::capacity);
          size = Metrics.register(factory.createMetricName(SIZE), cache::weightedSize);
          entries = Metrics.register(factory.createMetricName(ENTRIES), cache::size);
      }
  }
  