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.services;
  
  import java.util.HashMap;
  import java.util.HashSet;
  import java.util.Map;
  import java.util.Set;
  
  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.ServiceUpdateEvent;
  import org.apache.ambari.server.events.publishers.AmbariEventPublisher;
  import org.apache.ambari.server.events.publishers.STOMPUpdatePublisher;
  import org.apache.ambari.server.state.Clusters;
  import org.apache.ambari.server.state.MaintenanceState;
  
  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 ServiceUpdateListener {
  
    private STOMPUpdatePublisher STOMPUpdatePublisher;
  
    @Inject
    private Provider<Clusters> m_clusters;
  
    @Inject
    public ServiceUpdateListener(STOMPUpdatePublisher STOMPUpdatePublisher, AmbariEventPublisher ambariEventPublisher) {
      STOMPUpdatePublisher.registerAPI(this);
      ambariEventPublisher.register(this);
  
      this.STOMPUpdatePublisher = STOMPUpdatePublisher;
    }
  
    @Subscribe
    public void onHostComponentUpdate(HostComponentsUpdateEvent event) throws AmbariException {
      Map<Long, Set<String>> clustersServices = new HashMap<>();
      for (HostComponentUpdate hostComponentUpdate : event.getHostComponentUpdates()) {
        Long clusterId = hostComponentUpdate.getClusterId();
        String serviceName = hostComponentUpdate.getServiceName();
        clustersServices.computeIfAbsent(clusterId, c -> new HashSet<>()).add(serviceName);
      }
      for (Map.Entry<Long, Set<String>> clusterServices : clustersServices.entrySet()) {
        Long clusterId = clusterServices.getKey();
        String clusterName = m_clusters.get().getClusterById(clusterId).getClusterName();
        for (String serviceName : clusterServices.getValue()) {
          STOMPUpdatePublisher.publish(new ServiceUpdateEvent(clusterName, null, serviceName, null,
              true));
        }
      }
    }
  
    @Subscribe
    public void onMaintenanceStateUpdate(MaintenanceModeEvent event) throws AmbariException {
      if (event.getService() == null) {
        return;
      }
      Long clusterId = event.getClusterId();
      String clusterName = m_clusters.get().getClusterById(clusterId).getClusterName();
      String serviceName = event.getService().getName();
  
      MaintenanceState maintenanceState = event.getMaintenanceState();
  
      STOMPUpdatePublisher.publish(new ServiceUpdateEvent(clusterName, maintenanceState, serviceName, null,
          false));
    }
  }
  