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 org.apache.hadoop.hive.metastore.IMetaStoreClient;
  import org.slf4j.Logger;
  import org.slf4j.LoggerFactory;
  
  import java.lang.reflect.Proxy;
  import javax.annotation.Nullable;
  
  class HMSClientFactory {
    private static final Logger LOG = LoggerFactory.getLogger(HMSClientFactory.class);
  
    static IMetaStoreClient newInstance(IMetaStoreClient delegate) {
      HMSShim compatibility = null;
      try {
        compatibility = new HMSShim(delegate);
      } catch (Throwable t) {
        LOG.warn("Unable to initialize hive metastore compatibility client", t);
      }
      return newInstance(delegate, compatibility);
    }
  
    private static IMetaStoreClient newInstance(IMetaStoreClient delegate,
        @Nullable HMSShim compatibility) {
      ClassLoader classLoader = IMetaStoreClient.class.getClassLoader();
      Class<?>[] interfaces = new Class<?>[] { IMetaStoreClient.class };
      CompatibleMetastoreClient handler = new CompatibleMetastoreClient(delegate,
          compatibility);
      return (IMetaStoreClient) Proxy.newProxyInstance(classLoader, interfaces, handler);
    }
  }
  