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.xenbase;
  
  import java.util.Iterator;
  import java.util.Set;
  
  import org.apache.xmlrpc.XmlRpcException;
  
  import com.cloud.agent.api.Answer;
  import com.cloud.agent.api.ScaleVmAnswer;
  import com.cloud.agent.api.ScaleVmCommand;
  import com.cloud.agent.api.to.VirtualMachineTO;
  import com.cloud.hypervisor.xenserver.resource.CitrixResourceBase;
  import com.cloud.resource.CommandWrapper;
  import com.cloud.resource.ResourceWrapper;
  import com.cloud.utils.exception.CloudRuntimeException;
  import com.xensource.xenapi.Connection;
  import com.xensource.xenapi.Host;
  import com.xensource.xenapi.Types.VmPowerState;
  import com.xensource.xenapi.Types.XenAPIException;
  import com.xensource.xenapi.VM;
  
  @ResourceWrapper(handles =  ScaleVmCommand.class)
  public final class CitrixScaleVmCommandWrapper extends CommandWrapper<ScaleVmCommand, Answer, CitrixResourceBase> {
  
  
      @Override
      public Answer execute(final ScaleVmCommand command, final CitrixResourceBase citrixResourceBase) {
          final VirtualMachineTO vmSpec = command.getVirtualMachine();
          final String vmName = vmSpec.getName();
          try {
              final Connection conn = citrixResourceBase.getConnection();
              final Set<VM> vms = VM.getByNameLabel(conn, vmName);
              final Host host = Host.getByUuid(conn, citrixResourceBase.getHost().getUuid());
  
              // If DMC is not enable then don't execute this command.
              if (!citrixResourceBase.isDmcEnabled(conn, host)) {
                  throw new CloudRuntimeException("Unable to scale the vm: " + vmName + " as DMC - Dynamic memory control is not enabled for the XenServer:"
                          + citrixResourceBase.getHost().getUuid() + " ,check your license and hypervisor version.");
              }
  
              if (vms == null || vms.size() == 0) {
                  logger.info("No running VM " + vmName + " exists on XenServer" + citrixResourceBase.getHost().getUuid());
                  return new ScaleVmAnswer(command, false, "VM does not exist");
              }
  
              // stop vm which is running on this host or is in halted state
              final Iterator<VM> iter = vms.iterator();
              while (iter.hasNext()) {
                  final VM vm = iter.next();
                  final VM.Record vmr = vm.getRecord(conn);
  
                  if (vmr.powerState == VmPowerState.HALTED || vmr.powerState == VmPowerState.RUNNING && !citrixResourceBase.isRefNull(vmr.residentOn)
                          && !vmr.residentOn.getUuid(conn).equals(citrixResourceBase.getHost().getUuid())) {
                      iter.remove();
                  }
              }
  
              for (final VM vm : vms) {
                  vm.getRecord(conn);
                  try {
                      citrixResourceBase.scaleVM(conn, vm, vmSpec, host);
                  } catch (final Exception e) {
                      final String msg = "Catch exception " + e.getClass().getName() + " when scaling VM:" + vmName + " due to " + e.toString();
                      logger.debug(msg);
                      return new ScaleVmAnswer(command, false, msg);
                  }
  
              }
              final String msg = "scaling VM " + vmName + " is successful on host " + host;
              logger.debug(msg);
              return new ScaleVmAnswer(command, true, msg);
  
          } catch (final XenAPIException e) {
              final String msg = "Upgrade Vm " + vmName + " fail due to " + e.toString();
              logger.warn(msg, e);
              return new ScaleVmAnswer(command, false, msg);
          } catch (final XmlRpcException e) {
              final String msg = "Upgrade Vm " + vmName + " fail due to " + e.getMessage();
              logger.warn(msg, e);
              return new ScaleVmAnswer(command, false, msg);
          } catch (final Exception e) {
              final String msg = "Unable to upgrade " + vmName + " due to " + e.getMessage();
              logger.warn(msg, e);
              return new ScaleVmAnswer(command, false, msg);
          }
      }
  }
  