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.hypervisor.xenserver.resource.wrapper.xen56p1;
  
  import java.util.HashSet;
  import java.util.Map;
  import java.util.Set;
  
  import org.apache.xmlrpc.XmlRpcException;
  
  import com.cloud.agent.api.Answer;
  import com.cloud.agent.api.FenceAnswer;
  import com.cloud.agent.api.FenceCommand;
  import com.cloud.hypervisor.xenserver.resource.XenServer56Resource;
  import com.cloud.resource.CommandWrapper;
  import com.cloud.resource.ResourceWrapper;
  import com.xensource.xenapi.Connection;
  import com.xensource.xenapi.Types.XenAPIException;
  import com.xensource.xenapi.VBD;
  import com.xensource.xenapi.VDI;
  import com.xensource.xenapi.VM;
  
  @ResourceWrapper(handles =  FenceCommand.class)
  public final class XenServer56FP1FenceCommandWrapper extends CommandWrapper<FenceCommand, Answer, XenServer56Resource> {
  
  
      @Override
      public Answer execute(final FenceCommand command, final XenServer56Resource xenServer56) {
          final Connection conn = xenServer56.getConnection();
          try {
              final Boolean alive = xenServer56.checkHeartbeat(command.getHostGuid());
              if ( alive == null ) {
                  logger.debug("Failed to check heartbeat,  so unable to fence");
                  return new FenceAnswer(command, false, "Failed to check heartbeat, so unable to fence");
              }
              if ( alive ) {
                  logger.debug("Heart beat is still going so unable to fence");
                  return new FenceAnswer(command, false, "Heartbeat is still going on unable to fence");
              }
              final Set<VM> vms = VM.getByNameLabel(conn, command.getVmName());
              for (final VM vm : vms) {
                  final Set<VDI> vdis = new HashSet<VDI>();
                  final Set<VBD> vbds = vm.getVBDs(conn);
                  for (final VBD vbd : vbds) {
                      final VDI vdi = vbd.getVDI(conn);
                      if (!xenServer56.isRefNull(vdi)) {
                          vdis.add(vdi);
                      }
                  }
                  logger.info("Fence command for VM " + command.getVmName());
                  vm.powerStateReset(conn);
                  xenServer56.destroyVm(vm, conn);
                  for (final VDI vdi : vdis) {
                      final Map<String, String> smConfig = vdi.getSmConfig(conn);
                      for (final String key : smConfig.keySet()) {
                          if (key.startsWith("host_")) {
                              vdi.removeFromSmConfig(conn, key);
                              break;
                          }
                      }
                  }
              }
              return new FenceAnswer(command);
          } catch (final XmlRpcException e) {
              logger.warn("Unable to fence", e);
              return new FenceAnswer(command, false, e.getMessage());
          } catch (final XenAPIException e) {
              logger.warn("Unable to fence", e);
              return new FenceAnswer(command, false, e.getMessage());
          } catch (final Exception e) {
              logger.warn("Unable to fence", e);
              return new FenceAnswer(command, false, e.getMessage());
          }
      }
  }
  