content: /*
   * The Alluxio Open Foundation licenses this work under the Apache License, version 2.0
   * (the "License"). You may not use this work except in compliance with the License, which is
   * available at www.apache.org/licenses/LICENSE-2.0
   *
   * This software is distributed on an "AS IS" basis, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND,
   * either express or implied, as more fully set forth in the License.
   *
   * See the NOTICE file distributed with this work for information regarding copyright ownership.
   */
  
  package alluxio.table.under.hive.util;
  
  import java.util.Map;
  import java.util.concurrent.ConcurrentHashMap;
  
  /**
   * This class implements a cache for Client connection pools for Hive Clients.
   */
  public class HiveClientPoolCache {
    private final Map<String, AbstractHiveClientPool> mClientPools;
  
    /**
     * Constructor for the Client Pool cache.
     */
    public HiveClientPoolCache() {
      mClientPools = new ConcurrentHashMap<>();
    }
  
    /**
     * Get a hive client pool from the cache.
     *
     * @param connectionURI connection which serves as key
     * @return hive client pool
     */
    public AbstractHiveClientPool getPool(String connectionURI) {
      return mClientPools.compute(connectionURI, (uri, pool) -> {
        if (pool != null) {
          return pool;
        } else {
          return new DefaultHiveClientPool(connectionURI);
        }
      });
    }
  }
  