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.kvm.resource.wrapper;
  
  import java.util.HashMap;
  import java.util.List;
  
  import org.libvirt.Connect;
  import org.libvirt.LibvirtException;
  
  import com.cloud.agent.api.Answer;
  import com.cloud.agent.api.GetVmStatsAnswer;
  import com.cloud.agent.api.GetVmStatsCommand;
  import com.cloud.agent.api.VmStatsEntry;
  import com.cloud.hypervisor.kvm.resource.LibvirtComputingResource;
  import com.cloud.resource.CommandWrapper;
  import com.cloud.resource.ResourceWrapper;
  
  @ResourceWrapper(handles =  GetVmStatsCommand.class)
  public final class LibvirtGetVmStatsCommandWrapper extends CommandWrapper<GetVmStatsCommand, Answer, LibvirtComputingResource> {
  
  
      @Override
      public Answer execute(final GetVmStatsCommand command, final LibvirtComputingResource libvirtComputingResource) {
          final List<String> vmNames = command.getVmNames();
          try {
              final HashMap<String, VmStatsEntry> vmStatsNameMap = new HashMap<String, VmStatsEntry>();
              for (final String vmName : vmNames) {
  
                  final LibvirtUtilitiesHelper libvirtUtilitiesHelper = libvirtComputingResource.getLibvirtUtilitiesHelper();
  
                  final Connect conn = libvirtUtilitiesHelper.getConnectionByVmName(vmName);
                  try {
                      final VmStatsEntry statEntry = libvirtComputingResource.getVmStat(conn, vmName);
                      if (statEntry == null) {
                          continue;
                      }
  
                      vmStatsNameMap.put(vmName, statEntry);
                  } catch (LibvirtException e) {
                      logger.warn("Can't get vm stats: " + e.toString() + ", continue");
                  }
              }
              return new GetVmStatsAnswer(command, vmStatsNameMap);
          } catch (final LibvirtException e) {
              logger.debug("Can't get vm stats: " + e.toString());
              return new GetVmStatsAnswer(command, null);
          }
      }
  }
  