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.asterix.cloud.bulk;
  
  import java.util.Set;
  import java.util.stream.Collectors;
  
  import org.apache.asterix.cloud.clients.ICloudClient;
  import org.apache.hyracks.api.exceptions.HyracksDataException;
  import org.apache.hyracks.api.io.FileReference;
  import org.apache.hyracks.cloud.util.CloudRetryableRequestUtil;
  import org.apache.hyracks.control.nc.io.IOManager;
  import org.apache.hyracks.control.nc.io.bulk.DeleteBulkOperation;
  import org.apache.logging.log4j.LogManager;
  import org.apache.logging.log4j.Logger;
  
  public class DeleteBulkCloudOperation extends DeleteBulkOperation {
      private static final Logger LOGGER = LogManager.getLogger();
      private final String bucket;
      private final ICloudClient cloudClient;
      private final IBulkOperationCallBack callBack;
  
      public DeleteBulkCloudOperation(IOManager ioManager, String bucket, ICloudClient cloudClient,
              IBulkOperationCallBack callBack) {
          super(ioManager);
          this.bucket = bucket;
          this.cloudClient = cloudClient;
          this.callBack = callBack;
      }
  
      @Override
      public int performOperation() throws HyracksDataException {
          /*
           * TODO What about deleting multiple directories?
           *      Actually, is there a case where we delete multiple directories from the cloud?
           */
          Set<String> paths = fileReferences.stream().map(FileReference::getRelativePath).collect(Collectors.toSet());
          if (paths.isEmpty()) {
              return 0;
          }
  
          if (LOGGER.isDebugEnabled()) {
              LOGGER.debug("Bulk deleting: local: {}, cloud: {}", fileReferences, paths);
          }
          CloudRetryableRequestUtil.run(() -> cloudClient.deleteObjects(bucket, paths));
          // Bulk delete locally as well
          super.performOperation();
          callBack.call(fileReferences);
          return fileReferences.size();
      }
  }
  