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.csp.sentinel.cluster.flow.statistic.concurrent;
  
  import com.alibaba.csp.sentinel.cluster.flow.statistic.concurrent.expire.RegularExpireStrategy;
  import com.alibaba.csp.sentinel.util.AssertUtil;
  import com.googlecode.concurrentlinkedhashmap.ConcurrentLinkedHashMap;
  import com.googlecode.concurrentlinkedhashmap.Weighers;
  
  import java.util.Set;
  
  /**
   * @author yunfeiyanggzq
   */
  public class TokenCacheNodeManager {
      private static ConcurrentLinkedHashMap<Long, TokenCacheNode> TOKEN_CACHE_NODE_MAP;
  
  
      private static final int DEFAULT_CONCURRENCY_LEVEL = 16;
      private static final int DEFAULT_CAPACITY = Integer.MAX_VALUE;
  
      static {
          prepare(DEFAULT_CONCURRENCY_LEVEL, DEFAULT_CAPACITY);
      }
  
      public static void prepare(int concurrencyLevel, int maximumWeightedCapacity) {
          AssertUtil.isTrue(concurrencyLevel > 0, "concurrencyLevel must be positive");
          AssertUtil.isTrue(maximumWeightedCapacity > 0, "maximumWeightedCapacity must be positive");
  
          TOKEN_CACHE_NODE_MAP = new ConcurrentLinkedHashMap.Builder<Long, TokenCacheNode>()
                  .concurrencyLevel(concurrencyLevel)
                  .maximumWeightedCapacity(maximumWeightedCapacity)
                  .weigher(Weighers.singleton())
                  .build();
          // Start the task of regularly clearing expired keys
          RegularExpireStrategy strategy = new RegularExpireStrategy(TOKEN_CACHE_NODE_MAP);
          strategy.startClearTaskRegularly();
      }
  
  
      public static TokenCacheNode getTokenCacheNode(long tokenId) {
          //use getQuietly to prevent disorder
          return TOKEN_CACHE_NODE_MAP.getQuietly(tokenId);
      }
  
      public static void putTokenCacheNode(long tokenId, TokenCacheNode cacheNode) {
          TOKEN_CACHE_NODE_MAP.put(tokenId, cacheNode);
      }
  
      public static boolean isContainsTokenId(long tokenId) {
          return TOKEN_CACHE_NODE_MAP.containsKey(tokenId);
      }
  
      public static TokenCacheNode removeTokenCacheNode(long tokenId) {
          return TOKEN_CACHE_NODE_MAP.remove(tokenId);
      }
  
      public static int getSize() {
          return TOKEN_CACHE_NODE_MAP.size();
      }
  
      public static Set<Long> getCacheKeySet() {
          return TOKEN_CACHE_NODE_MAP.keySet();
      }
  
      public static boolean validToken(TokenCacheNode cacheNode) {
          return cacheNode.getTokenId() != null && cacheNode.getFlowId() != null && cacheNode.getClientTimeout() >= 0 && cacheNode.getResourceTimeout() >= 0;
      }
  }
  