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.carbondata.core.cache;
  
  /**
   * interface which declares methods which will decide whether to keep
   * cacheable objects in memory
   */
  public interface Cacheable {
  
    /**
     * This method will return the access count for a column based on which decision will be taken
     * whether to keep the object in memory
     *
     * @return
     */
    int getAccessCount();
  
    /**
     * This method will return the memory size of a column
     *
     * @return
     */
    long getMemorySize();
  
    /**
     * Method to be used for invalidating the cacheable object. API to be invoked at the time of
     * removing the cacheable object from memory. Example at removing the cacheable object
     * from LRU cache
     */
    void invalidate();
  }
  