/*
    *    Copyright 2016-2023 the original author or authors.
    *
    *    Licensed 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
    *
    *       https://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.mybatis.caches.caffeine;
  
  import com.github.benmanes.caffeine.cache.Caffeine;
  
  import java.util.concurrent.locks.ReadWriteLock;
  
  import org.apache.ibatis.cache.Cache;
  
  /**
   * Cache adapter for Caffeine.
   *
   * @author Eddú Meléndez
   */
  public final class CaffeineCache implements Cache {
  
    private com.github.benmanes.caffeine.cache.Cache<Object, Object> cache;
  
    private String id;
  
    /**
     * Instantiates a new caffeine cache.
     *
     * @param id
     *          the id
     */
    public CaffeineCache(String id) {
      if (id == null) {
        throw new IllegalArgumentException("Cache instances require an ID");
      }
  
      this.cache = Caffeine.newBuilder().build();
      this.id = id;
    }
  
    @Override
    public String getId() {
      return this.id;
    }
  
    @Override
    public void putObject(Object key, Object value) {
      // Do not allow null values to be cached as not allowed in caffeine cache
      if (key != null && value != null) {
        this.cache.put(key, value);
      }
    }
  
    @Override
    public Object getObject(Object key) {
      return this.cache.getIfPresent(key);
    }
  
    @Override
    public Object removeObject(Object key) {
      return this.cache.asMap().remove(key);
    }
  
    @Override
    public void clear() {
      this.cache.invalidateAll();
    }
  
    @Override
    public int getSize() {
      return (int) this.cache.estimatedSize();
    }
  
    @Override
    public ReadWriteLock getReadWriteLock() {
      return null;
    }
  
  }