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.replication.messaging;
  
  import java.io.DataInput;
  import java.io.DataOutputStream;
  import java.io.IOException;
  import java.io.OutputStream;
  
  import org.apache.asterix.common.api.INcApplicationContext;
  import org.apache.asterix.common.exceptions.ReplicationException;
  import org.apache.asterix.common.storage.ResourceReference;
  import org.apache.asterix.replication.api.IReplicaTask;
  import org.apache.asterix.replication.api.IReplicationWorker;
  import org.apache.asterix.transaction.management.resource.PersistentLocalResourceRepository;
  import org.apache.hyracks.api.exceptions.HyracksDataException;
  import org.apache.hyracks.api.io.FileReference;
  import org.apache.hyracks.api.io.IIOManager;
  import org.apache.logging.log4j.LogManager;
  import org.apache.logging.log4j.Logger;
  
  /**
   * A task to delete a file on a replica if exists
   */
  public class DeleteFileTask implements IReplicaTask {
  
      private static final Logger LOGGER = LogManager.getLogger();
      private final String file;
  
      public DeleteFileTask(String file) {
          this.file = file;
      }
  
      @Override
      public void perform(INcApplicationContext appCtx, IReplicationWorker worker) {
          try {
              final IIOManager ioManager = appCtx.getIoManager();
              final FileReference localFile = ioManager.resolve(file);
              if (ioManager.exists(localFile)) {
                  ioManager.delete(localFile);
                  ResourceReference replicaRes = ResourceReference.of(localFile.getAbsolutePath());
                  if (replicaRes.isMetadataResource()) {
                      ((PersistentLocalResourceRepository) appCtx.getLocalResourceRepository())
                              .invalidateResource(replicaRes.getRelativePath().toString());
                  }
                  LOGGER.debug(() -> "Deleted file: " + localFile.getAbsolutePath());
              } else {
                  LOGGER.warn(() -> "Requested to delete a non-existing file: " + localFile.getAbsolutePath());
              }
              ReplicationProtocol.sendAck(worker.getChannel(), worker.getReusableBuffer());
          } catch (IOException e) {
              throw new ReplicationException(e);
          }
      }
  
      @Override
      public ReplicationProtocol.ReplicationRequestType getMessageType() {
          return ReplicationProtocol.ReplicationRequestType.DELETE_RESOURCE_FILE;
      }
  
      @Override
      public void serialize(OutputStream out) throws HyracksDataException {
          try {
              DataOutputStream dos = new DataOutputStream(out);
              dos.writeUTF(file);
          } catch (IOException e) {
              throw HyracksDataException.create(e);
          }
      }
  
      @Override
      public String toString() {
          return "DeleteFileTask{" + "file='" + file + '\'' + '}';
      }
  
      public static DeleteFileTask create(DataInput input) throws IOException {
          return new DeleteFileTask(input.readUTF());
      }
  }
  