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.events.listeners.hostcomponents;
  
  import java.util.Collections;
  
  import org.apache.ambari.server.AmbariException;
  import org.apache.ambari.server.EagerSingleton;
  import org.apache.ambari.server.events.HostComponentUpdate;
  import org.apache.ambari.server.events.HostComponentsUpdateEvent;
  import org.apache.ambari.server.events.MaintenanceModeEvent;
  import org.apache.ambari.server.events.StaleConfigsUpdateEvent;
  import org.apache.ambari.server.events.publishers.AmbariEventPublisher;
  import org.apache.ambari.server.events.publishers.STOMPUpdatePublisher;
  import org.apache.ambari.server.state.ConfigHelper;
  import org.apache.ambari.server.state.MaintenanceState;
  import org.apache.ambari.server.state.ServiceComponentHost;
  
  import com.google.common.eventbus.Subscribe;
  import com.google.inject.Inject;
  import com.google.inject.Provider;
  import com.google.inject.Singleton;
  
  @Singleton
  @EagerSingleton
  public class HostComponentsUpdateListener {
  
    private final STOMPUpdatePublisher STOMPUpdatePublisher;
  
    @Inject
    private Provider<ConfigHelper> m_configHelper;
  
    @Inject
    public HostComponentsUpdateListener(AmbariEventPublisher ambariEventPublisher,
                                        STOMPUpdatePublisher STOMPUpdatePublisher) {
      ambariEventPublisher.register(this);
      this.STOMPUpdatePublisher = STOMPUpdatePublisher;
    }
  
    @Subscribe
    public void onMaintenanceStateUpdate(MaintenanceModeEvent event) {
      if (event.getServiceComponentHost() != null) {
        Long clusterId = event.getClusterId();
        ServiceComponentHost serviceComponentHost = event.getServiceComponentHost();
        String serviceName = serviceComponentHost.getServiceName();
        String componentName = serviceComponentHost.getServiceComponentName();
        String hostName = serviceComponentHost.getHostName();
        MaintenanceState maintenanceState = serviceComponentHost.getMaintenanceState();
        HostComponentUpdate hostComponentUpdate =
            HostComponentUpdate.createHostComponentMaintenanceStatusUpdate(clusterId, serviceName, hostName,
                componentName, maintenanceState);
        HostComponentsUpdateEvent hostComponentsUpdateEvent = new HostComponentsUpdateEvent(
            Collections.singletonList(hostComponentUpdate));
  
        STOMPUpdatePublisher.publish(hostComponentsUpdateEvent);
      }
    }
  
    @Subscribe
    public void onStaleConfigsStateUpdate(StaleConfigsUpdateEvent staleConfigsUpdateEvent) throws AmbariException {
      ServiceComponentHost serviceComponentHost = staleConfigsUpdateEvent.getServiceComponentHost();
      if (staleConfigsUpdateEvent.getStaleConfigs() != null) {
        boolean staleConfigs = staleConfigsUpdateEvent.getStaleConfigs();
        if (m_configHelper.get().wasStaleConfigsStatusUpdated(serviceComponentHost.getClusterId(),
            serviceComponentHost.getHost().getHostId(), serviceComponentHost.getServiceName(),
            serviceComponentHost.getServiceComponentName(), staleConfigs)) {
          STOMPUpdatePublisher.publish(new HostComponentsUpdateEvent(Collections.singletonList(
              HostComponentUpdate.createHostComponentStaleConfigsStatusUpdate(serviceComponentHost.getClusterId(),
                  serviceComponentHost.getServiceName(), serviceComponentHost.getHostName(),
                  serviceComponentHost.getServiceComponentName(), staleConfigs))));
        }
      }
    }
  }
  