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.ArrayList;
  import java.util.List;
  import java.util.Set;
  
  import com.cloud.utils.exception.CloudRuntimeException;
  import org.apache.cloudstack.storage.to.VolumeObjectTO;
  
  import com.cloud.agent.api.Answer;
  import com.cloud.agent.api.DeleteVMSnapshotAnswer;
  import com.cloud.agent.api.DeleteVMSnapshotCommand;
  import com.cloud.hypervisor.xenserver.resource.CitrixResourceBase;
  import com.cloud.resource.CommandWrapper;
  import com.cloud.resource.ResourceWrapper;
  import com.cloud.vm.snapshot.VMSnapshot;
  import com.xensource.xenapi.Connection;
  import com.xensource.xenapi.Types;
  import com.xensource.xenapi.VBD;
  import com.xensource.xenapi.VDI;
  import com.xensource.xenapi.VM;
  
  @ResourceWrapper(handles =  DeleteVMSnapshotCommand.class)
  public final class CitrixDeleteVMSnapshotCommandWrapper extends CommandWrapper<DeleteVMSnapshotCommand, Answer, CitrixResourceBase> {
  
  
      @Override
      public Answer execute(final DeleteVMSnapshotCommand command, final CitrixResourceBase citrixResourceBase) {
          final String snapshotName = command.getTarget().getSnapshotName();
          final Connection conn = citrixResourceBase.getConnection();
  
          try {
              final List<VDI> vdiList = new ArrayList<VDI>();
              final Set<VM> snapshots = VM.getByNameLabel(conn, snapshotName);
              if (snapshots == null || snapshots.size() == 0) {
                  logger.warn("VM snapshot with name " + snapshotName + " does not exist, assume it is already deleted");
                  return new DeleteVMSnapshotAnswer(command, command.getVolumeTOs());
              }
              final VM snapshot = snapshots.iterator().next();
              final Set<VBD> vbds = snapshot.getVBDs(conn);
              for (final VBD vbd : vbds) {
                  if (vbd.getType(conn) == Types.VbdType.DISK) {
                      final VDI vdi = vbd.getVDI(conn);
                      vdiList.add(vdi);
                  }
              }
              if (command.getTarget().getType() == VMSnapshot.Type.DiskAndMemory) {
                  vdiList.add(snapshot.getSuspendVDI(conn));
              }
              citrixResourceBase.destroyVm(snapshot, conn, true);
              for (final VDI vdi : vdiList) {
                  vdi.destroy(conn);
              }
  
              try {
                  Thread.sleep(5000);
              } catch (final InterruptedException ex) {
  
              }
              // re-calculate used capacify for this VM snapshot
              for (final VolumeObjectTO volumeTo : command.getVolumeTOs()) {
                  try {
                      final long size = citrixResourceBase.getVMSnapshotChainSize(conn, volumeTo, command.getVmName(), snapshotName);
                      volumeTo.setSize(size);
                  } catch (final CloudRuntimeException cre) {
  
                  }
              }
  
              return new DeleteVMSnapshotAnswer(command, command.getVolumeTOs());
          } catch (final Exception e) {
              logger.warn("Catch Exception: " + e.getClass().toString() + " due to " + e.toString(), e);
              return new DeleteVMSnapshotAnswer(command, false, e.getMessage());
          }
      }
  }
  