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.common.utils.StorageConstants;
  import org.apache.asterix.replication.api.IReplicaTask;
  import org.apache.asterix.replication.api.IReplicationWorker;
  import org.apache.hyracks.api.exceptions.HyracksDataException;
  import org.apache.hyracks.api.io.FileReference;
  import org.apache.hyracks.api.io.IIOManager;
  
  /**
   * A task to create a mask file for an incoming lsm component from master
   */
  public class ComponentMaskTask implements IReplicaTask {
  
      private final String file;
  
      public ComponentMaskTask(String file) {
          this.file = file;
      }
  
      @Override
      public void perform(INcApplicationContext appCtx, IReplicationWorker worker) {
          try {
              IIOManager ioManager = appCtx.getIoManager();
              // create mask
              final FileReference maskPath = getComponentMaskPath(ioManager, file);
              ioManager.create(maskPath);
              ReplicationProtocol.sendAck(worker.getChannel(), worker.getReusableBuffer());
          } catch (IOException e) {
              throw new ReplicationException(e);
          }
      }
  
      public static FileReference getComponentMaskPath(IIOManager ioManager, String componentFile) throws IOException {
          final FileReference localPath = ioManager.resolve(componentFile);
          final FileReference resourceDir = localPath.getParent();
          ioManager.makeDirectories(resourceDir);
          final String componentSequence = ResourceReference.getComponentSequence(componentFile);
          return resourceDir.getChild(StorageConstants.COMPONENT_MASK_FILE_PREFIX + componentSequence);
      }
  
      @Override
      public ReplicationProtocol.ReplicationRequestType getMessageType() {
          return ReplicationProtocol.ReplicationRequestType.LSM_COMPONENT_MASK;
      }
  
      @Override
      public void serialize(OutputStream out) throws HyracksDataException {
          try {
              final DataOutputStream dos = new DataOutputStream(out);
              dos.writeUTF(file);
          } catch (IOException e) {
              throw HyracksDataException.create(e);
          }
      }
  
      public static ComponentMaskTask create(DataInput input) throws IOException {
          String indexFile = input.readUTF();
          return new ComponentMaskTask(indexFile);
      }
  }
  