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 java.util.Map;
  
  import javax.inject.Inject;
  import javax.naming.ConfigurationException;
  
  
  import com.cloud.agent.AgentManager;
  import com.cloud.agent.api.FenceAnswer;
  import com.cloud.agent.api.FenceCommand;
  import com.cloud.exception.AgentUnavailableException;
  import com.cloud.exception.OperationTimedoutException;
  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.HypervisorType;
  import com.cloud.resource.ResourceManager;
  import com.cloud.utils.component.AdapterBase;
  import com.cloud.vm.VirtualMachine;
  
  public class SimulatorFencer extends AdapterBase implements FenceBuilder {
  
      @Inject HostDao _hostDao;
      @Inject AgentManager _agentMgr;
      @Inject ResourceManager _resourceMgr;
      @Override
      public boolean configure(String name, Map<String, Object> params)
              throws ConfigurationException {
          // TODO Auto-generated method stub
          return true;
      }
  
      @Override
      public boolean start() {
          // TODO Auto-generated method stub
          return true;
      }
  
      @Override
      public boolean stop() {
          // TODO Auto-generated method stub
          return true;
      }
  
      public SimulatorFencer() {
          super();
      }
  
      @Override
      public Boolean fenceOff(VirtualMachine vm, Host host) {
          if (host.getHypervisorType() != HypervisorType.Simulator) {
              logger.debug("Don't know how to fence non simulator hosts " + host.getHypervisorType());
              return null;
          }
  
          List<HostVO> hosts = _resourceMgr.listAllHostsInCluster(host.getClusterId());
          FenceCommand fence = new FenceCommand(vm, host);
  
          for (HostVO h : hosts) {
              if (h.getHypervisorType() == HypervisorType.Simulator) {
                  if( h.getStatus() != Status.Up ) {
                      continue;
                  }
                  if( h.getId() == host.getId() ) {
                      continue;
                  }
                  FenceAnswer answer = null;
                  try {
                      answer = (FenceAnswer)_agentMgr.send(h.getId(), fence);
                  } catch (AgentUnavailableException e) {
                      if (logger.isDebugEnabled()) {
                          logger.debug("Moving on to the next host because " + h.toString() + " is unavailable", e);
                      }
                      continue;
                  } catch (OperationTimedoutException e) {
                      if (logger.isDebugEnabled()) {
                          logger.debug("Moving on to the next host because " + h.toString() + " is unavailable", e);
                      }
                      continue;
                  }
                  if (answer != null && answer.getResult()) {
                      return true;
                  }
              }
          }
  
          if (logger.isDebugEnabled()) {
              logger.debug("Unable to fence off " + vm.toString() + " on " + host.toString());
          }
  
          return false;
      }
  }
  