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.cloud.ha;
  
  import java.util.List;
  
  import javax.inject.Inject;
  
  import org.springframework.stereotype.Component;
  
  import org.apache.cloudstack.storage.datastore.db.PrimaryDataStoreDao;
  
  import com.cloud.host.Host;
  import com.cloud.storage.VolumeVO;
  import com.cloud.storage.dao.VolumeDao;
  import com.cloud.utils.component.AdapterBase;
  import com.cloud.vm.VirtualMachine;
  
  @Component
  public class RecreatableFencer extends AdapterBase implements FenceBuilder {
      @Inject
      VolumeDao _volsDao;
      @Inject
      PrimaryDataStoreDao _poolDao;
  
      public RecreatableFencer() {
          super();
      }
  
      @Override
      public Boolean fenceOff(VirtualMachine vm, Host host) {
          VirtualMachine.Type type = vm.getType();
          if (type != VirtualMachine.Type.ConsoleProxy && type != VirtualMachine.Type.DomainRouter && type != VirtualMachine.Type.SecondaryStorageVm) {
              if (logger.isDebugEnabled()) {
                  logger.debug("Don't know how to fence off " + type);
              }
              return null;
          }
          List<VolumeVO> vols = _volsDao.findByInstance(vm.getId());
          for (VolumeVO vol : vols) {
              if (!vol.isRecreatable()) {
                  if (logger.isDebugEnabled()) {
                      logger.debug("Unable to fence off volumes that are not recreatable: " + vol);
                  }
                  return null;
              }
              if (vol.getPoolType().isShared()) {
                  if (logger.isDebugEnabled()) {
                      logger.debug("Unable to fence off volumes that are shared: " + vol);
                  }
                  return null;
              }
          }
          return true;
      }
  }
  