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.vm.snapshot;
  
  import java.util.List;
  
  import com.cloud.utils.fsm.NoTransitionException;
  import org.apache.cloudstack.api.command.user.vmsnapshot.ListVMSnapshotCmd;
  
  import com.cloud.exception.ConcurrentOperationException;
  import com.cloud.exception.InsufficientCapacityException;
  import com.cloud.exception.InsufficientServerCapacityException;
  import com.cloud.exception.ResourceAllocationException;
  import com.cloud.exception.ResourceUnavailableException;
  import com.cloud.uservm.UserVm;
  import com.cloud.utils.Pair;
  import com.cloud.vm.VirtualMachine;
  
  public interface VMSnapshotService {
  
      Pair<List<? extends VMSnapshot>, Integer> listVMSnapshots(ListVMSnapshotCmd cmd);
  
      VMSnapshot getVMSnapshotById(Long id);
  
      VMSnapshot createVMSnapshot(Long vmId, Long vmSnapshotId, Boolean quiescevm);
  
      VMSnapshot allocVMSnapshot(Long vmId, String vsDisplayName, String vsDescription, Boolean snapshotMemory) throws ResourceAllocationException;
  
      boolean deleteVMSnapshot(Long vmSnapshotId);
  
      UserVm revertToSnapshot(Long vmSnapshotId) throws InsufficientServerCapacityException, InsufficientCapacityException, ResourceUnavailableException,
          ConcurrentOperationException;
  
      VirtualMachine getVMBySnapshotId(Long id);
  
      /**
       * Delete vm snapshots only from database. Introduced as a Vmware optimization in which vm snapshots are deleted when
       * the vm gets deleted on hypervisor (no need to delete each vm snapshot before deleting vm, just mark them as deleted on DB)
       * @param id vm id
       */
      boolean deleteVMSnapshotsFromDB(Long vmId, boolean unmanage);
  
      void updateOperationFailed(VMSnapshot vmSnapshot) throws NoTransitionException;
  }
  