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.nacos.common.cache.impl;
  
  import com.alibaba.nacos.common.cache.Cache;
  
  import java.util.HashMap;
  import java.util.Map;
  import java.util.concurrent.Callable;
  
  /**
   * Simple implementation of {@code Cache}.
   * @author zzq
   * @date 2021/7/30
   */
  public class SimpleCache<K, V> implements Cache<K, V> {
      
      private Map<K, V> cache;
      
      public SimpleCache(int size) {
          cache = new HashMap<>(size);
      }
      
      @Override
      public void put(K key, V val) {
          cache.put(key, val);
      }
      
      @Override
      public V get(K key) {
          return cache.get(key);
      }
      
      @Override
      public V get(K key, Callable<? extends V> call) throws Exception {
          if (cache.containsKey(key)) {
              return cache.get(key);
          } else {
              V v2 = call.call();
              cache.put(key, v2);
              return v2;
          }
      }
      
      @Override
      public V remove(K key) {
          return cache.remove(key);
      }
      
      @Override
      public void clear() {
          cache.clear();
      }
      
      @Override
      public int getSize() {
          return cache.size();
      }
  }
  