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 com.alibaba.wasp.master.handler;
  
  import com.alibaba.wasp.EntityGroupInfo;
  import com.alibaba.wasp.Server;
  import com.alibaba.wasp.TableLockedException;
  import com.alibaba.wasp.master.FMasterServices;
  import com.alibaba.wasp.master.TableLockManager;
  import com.alibaba.wasp.meta.FMetaEditor;
  import com.alibaba.wasp.meta.FMetaReader;
  import org.apache.commons.logging.Log;
  import org.apache.commons.logging.LogFactory;
  import org.apache.hadoop.hbase.util.Bytes;
  import org.apache.zookeeper.KeeperException;
  
  import java.io.IOException;
  import java.util.List;
  
  /**
   * Handler to delete a index.
   */
  public class DeleteIndexHandler extends TableEventHandler {
    private static final Log LOG = LogFactory.getLog(DeleteIndexHandler.class);
    private String indexName;
    private TableLockManager tableLockManager;
  
    /**
     * @param tableName
     * @param server
     * @param fMasterServices
     * @param eventType
     * @throws java.io.IOException
     */
    public DeleteIndexHandler(byte[] tableName, String indexName, Server server,
        FMasterServices fMasterServices, EventType eventType) throws IOException {
      super(tableName, server, fMasterServices, eventType);
      this.tableLockManager = fMasterServices.getTableLockManager();
      if (tableLockManager.lockTable(tableNameStr)) {
        LOG.info("lock table '" + tableNameStr + "' by DeleteIndexHandler");
      } else {
        throw new TableLockedException(tableNameStr + " has been locked. ");
      }
      this.indexName = indexName;
    }
  
    /**
     * @see com.alibaba.wasp.master.handler.TableEventHandler#handleTableOperation(java.util.List)
     */
    @Override
    protected void handleTableOperation(List<EntityGroupInfo> entityGroups)
        throws IOException, KeeperException {
      String strTableName = Bytes.toString(tableName);
      try {
        FMetaEditor.deleteIndex(server.getConfiguration(), strTableName,
            FMetaReader.getIndex(server.getConfiguration(), strTableName,
                indexName));
      } finally {
        tableLockManager.unlockTable(tableNameStr);
      }
    }
  }