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.ha;
  
  import java.util.List;
  
  import javax.inject.Inject;
  
  
  import com.cloud.agent.AgentManager;
  import com.cloud.agent.api.Answer;
  import com.cloud.agent.api.CheckOnHostCommand;
  import com.cloud.host.Host;
  import com.cloud.host.HostVO;
  import com.cloud.host.Status;
  import com.cloud.host.dao.HostDao;
  import com.cloud.hypervisor.Hypervisor;
  import com.cloud.resource.ResourceManager;
  import com.cloud.utils.component.AdapterBase;
  
  public class HypervInvestigator extends AdapterBase implements Investigator {
      @Inject HostDao _hostDao;
      @Inject AgentManager _agentMgr;
      @Inject ResourceManager _resourceMgr;
  
      @Override
      public boolean isVmAlive(com.cloud.vm.VirtualMachine vm, Host host) throws UnknownVM {
          Status status = isAgentAlive(host);
          if (status == null) {
              throw new UnknownVM();
          }
          return status == Status.Up ? true : null;
      }
  
      @Override
      public Status isAgentAlive(Host agent) {
          if (agent.getHypervisorType() != Hypervisor.HypervisorType.Hyperv) {
              return null;
          }
          CheckOnHostCommand cmd = new CheckOnHostCommand(agent);
          List<HostVO> neighbors = _resourceMgr.listHostsInClusterByStatus(agent.getClusterId(), Status.Up);
          for (HostVO neighbor : neighbors) {
              if (neighbor.getId() == agent.getId() || neighbor.getHypervisorType() != Hypervisor.HypervisorType.Hyperv) {
                  continue;
              }
  
              try {
                  Answer answer = _agentMgr.easySend(neighbor.getId(), cmd);
                  if (answer != null) {
                      return answer.getResult() ? Status.Down : Status.Up;
                  }
              } catch (Exception e) {
                  logger.debug(String.format("Failed to send command to host: %s", neighbor), e);
              }
          }
  
          return null;
      }
  }
  