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 org.apache.ambari.server.controller.internal;
  
  import java.util.Collections;
  import java.util.Set;
  
  import org.apache.ambari.server.AmbariException;
  import org.apache.ambari.server.controller.AmbariManagementController;
  import org.apache.ambari.server.controller.HostRequest;
  import org.apache.ambari.server.controller.HostResponse;
  import org.apache.ambari.server.controller.ServiceComponentHostRequest;
  import org.apache.ambari.server.controller.ServiceComponentHostResponse;
  import org.apache.ambari.server.state.HostState;
  import org.apache.ambari.server.state.State;
  import org.slf4j.Logger;
  import org.slf4j.LoggerFactory;
  
  public class HostStatusHelper {
  
    private static final Logger LOG =
      LoggerFactory.getLogger(HostStatusHelper.class);
  
    public static boolean isHostComponentLive(AmbariManagementController managementController,
                                               String clusterName, String hostName,
                                        String serviceName, String componentName) {
      if (clusterName == null) {
        return false;
      }
  
      ServiceComponentHostResponse componentHostResponse;
  
      try {
        ServiceComponentHostRequest componentRequest =
          new ServiceComponentHostRequest(clusterName, serviceName,
            componentName, hostName, null);
  
        Set<ServiceComponentHostResponse> hostComponents =
          managementController.getHostComponents(Collections.singleton(componentRequest));
  
        componentHostResponse = hostComponents.size() == 1 ? hostComponents.iterator().next() : null;
      } catch (AmbariException e) {
        LOG.debug("Error checking {} server host component state: ", componentName, e);
        return false;
      }
  
      //Cluster without SCH
      return componentHostResponse != null &&
        componentHostResponse.getLiveState().equals(State.STARTED.name());
    }
  
    public static boolean isHostLive(AmbariManagementController managementController, String clusterName, String hostName) {
      if (clusterName == null) {
        return false;
      }
      HostResponse hostResponse;
  
      try {
        HostRequest hostRequest = new HostRequest(hostName, clusterName);
        Set<HostResponse> hosts = HostResourceProvider.getHosts(managementController, hostRequest, null);
  
        hostResponse = hosts.size() == 1 ? hosts.iterator().next() : null;
      } catch (AmbariException e) {
        LOG.debug("Error while checking host live status: ", e);
        return false;
      }
      //Cluster without host
      return hostResponse != null &&
        !hostResponse.getHostState().equals(HostState.HEARTBEAT_LOST);
    }
  }
  