content: /**
   * Licensed to the Apache Software Foundation (ASF) under one
   * or more contributor license agreements.  See the NOTICE file
   * distributed with this work for additional information
   * regarding copyright ownership.  The ASF licenses this file
   * to you 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 org.apache.hive.service.server;
  
  import java.util.Map;
  
  import org.apache.commons.logging.Log;
  import org.apache.commons.logging.LogFactory;
  import org.apache.hadoop.hive.metastore.HiveMetaStore;
  import org.apache.hadoop.hive.metastore.RawStore;
  
  /**
   * A HiveServer2 thread used to construct new server threads.
   * In particular, this thread ensures an orderly cleanup,
   * when killed by its corresponding ExecutorService.
   */
  public class ThreadWithGarbageCleanup extends Thread {
    private static final Log LOG = LogFactory.getLog(ThreadWithGarbageCleanup.class);
  
    Map<Long, RawStore> threadRawStoreMap =
        ThreadFactoryWithGarbageCleanup.getThreadRawStoreMap();
  
    public ThreadWithGarbageCleanup(Runnable runnable) {
      super(runnable);
    }
  
    /**
     * Add any Thread specific garbage cleanup code here.
     * Currently, it shuts down the RawStore object for this thread if it is not null.
     */
    @Override
    public void finalize() throws Throwable {
      cleanRawStore();
      super.finalize();
    }
  
    private void cleanRawStore() {
      Long threadId = this.getId();
      RawStore threadLocalRawStore = threadRawStoreMap.get(threadId);
      if (threadLocalRawStore != null) {
        LOG.debug("RawStore: " + threadLocalRawStore + ", for the thread: " +
            this.getName()  +  " will be closed now.");
        threadLocalRawStore.shutdown();
        threadRawStoreMap.remove(threadId);
      }
    }
  
    /**
     * Cache the ThreadLocal RawStore object. Called from the corresponding thread.
     */
    public void cacheThreadLocalRawStore() {
      Long threadId = this.getId();
      RawStore threadLocalRawStore = HiveMetaStore.HMSHandler.getRawStore();
      if (threadLocalRawStore != null && !threadRawStoreMap.containsKey(threadId)) {
        LOG.debug("Adding RawStore: " + threadLocalRawStore + ", for the thread: " +
            this.getName() + " to threadRawStoreMap for future cleanup.");
        threadRawStoreMap.put(threadId, threadLocalRawStore);
      }
    }
  }
  