content: /*
   * Copyright 1999-2018 Alibaba Group Holding Ltd.
   *
   * 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
   *
   *      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 com.alibaba.druid.util;
  
  import java.util.LinkedHashMap;
  import java.util.Map;
  
  public class LRUCache<K, V> extends LinkedHashMap<K, V> {
      private static final long serialVersionUID = 1L;
      private final int maxSize;
  
      public LRUCache(int maxSize) {
          this(maxSize, 16, 0.75f, false);
      }
  
      public LRUCache(int maxSize, int initialCapacity, float loadFactor, boolean accessOrder) {
          super(initialCapacity, loadFactor, accessOrder);
          this.maxSize = maxSize;
      }
  
      protected boolean removeEldestEntry(Map.Entry<K, V> eldest) {
          return this.size() > this.maxSize;
      }
  }
  