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;
  
  import java.util.List;
  import java.util.concurrent.Callable;
  import java.util.stream.Collectors;
  
  
  import com.cloud.agent.api.to.HostTO;
  
  public class KVMHAChecker extends KVMHABase implements Callable<Boolean> {
      private List<HAStoragePool> storagePools;
      private HostTO host;
      private boolean reportFailureIfOneStorageIsDown;
  
      public KVMHAChecker(List<HAStoragePool> pools, HostTO host, boolean reportFailureIfOneStorageIsDown) {
          this.storagePools = pools;
          this.host = host;
          this.reportFailureIfOneStorageIsDown = reportFailureIfOneStorageIsDown;
      }
  
      /*
       * True means heartbeaing is on going, or we can't get it's status. False
       * means heartbeating is stopped definitely
       */
      @Override
      public Boolean checkingHeartBeat() {
          boolean validResult = false;
  
          String hostAndPools = String.format("host IP [%s] in pools [%s]", host.getPrivateNetwork().getIp(), storagePools.stream().map(pool -> pool.getPoolUUID()).collect(Collectors.joining(", ")));
  
          logger.debug(String.format("Checking heart beat with KVMHAChecker for %s", hostAndPools));
  
          for (HAStoragePool pool : storagePools) {
              validResult = pool.getPool().checkingHeartBeat(pool, host);
              if (reportFailureIfOneStorageIsDown && !validResult) {
                  break;
              }
          }
  
          if (!validResult) {
              logger.warn(String.format("All checks with KVMHAChecker for %s considered it as dead. It may cause a shutdown of the host.", hostAndPools));
          }
  
          return validResult;
      }
  
      @Override
      public Boolean call() throws Exception {
          // logger.addAppender(new org.apache.log4j.ConsoleAppender(new
          // org.apache.log4j.PatternLayout(), "System.out"));
          return checkingHeartBeat();
      }
  }
  