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.alerts;
  
  import java.util.ArrayList;
  import java.util.List;
  import java.util.Objects;
  
  import org.apache.ambari.server.EagerSingleton;
  import org.apache.ambari.server.agent.stomp.dto.AlertGroupUpdate;
  import org.apache.ambari.server.events.AlertDefinitionDeleteEvent;
  import org.apache.ambari.server.events.AlertGroupsUpdateEvent;
  import org.apache.ambari.server.events.UpdateEventType;
  import org.apache.ambari.server.events.publishers.AmbariEventPublisher;
  import org.apache.ambari.server.events.publishers.STOMPUpdatePublisher;
  import org.apache.ambari.server.orm.dao.AlertDispatchDAO;
  import org.apache.ambari.server.orm.entities.AlertDefinitionEntity;
  import org.apache.ambari.server.orm.entities.AlertGroupEntity;
  
  import com.google.common.eventbus.Subscribe;
  import com.google.inject.Inject;
  import com.google.inject.Singleton;
  
  @Singleton
  @EagerSingleton
  public class AlertGroupsUpdateListener {
  
    @Inject
    private STOMPUpdatePublisher STOMPUpdatePublisher;
  
    @Inject
    private AlertDispatchDAO alertDispatchDAO;
  
    @Inject
    public AlertGroupsUpdateListener(AmbariEventPublisher ambariEventPublisher) {
      ambariEventPublisher.register(this);
    }
  
    @Subscribe
    public void onAlertDefinitionDeleted(AlertDefinitionDeleteEvent event) {
      List<AlertGroupUpdate> alertGroupUpdates = new ArrayList<>();
      for (AlertGroupEntity alertGroupEntity : alertDispatchDAO.findAllGroups(event.getClusterId())) {
        boolean eventAffectsGroup = alertGroupEntity.getAlertDefinitions().stream()
          .map(AlertDefinitionEntity::getDefinitionId)
          .anyMatch(each -> Objects.equals(each, event.getDefinition().getDefinitionId()));
        if (eventAffectsGroup) {
          AlertGroupUpdate alertGroupUpdate = new AlertGroupUpdate(alertGroupEntity);
          alertGroupUpdate.getTargets().remove(event.getDefinition().getDefinitionId());
          alertGroupUpdates.add(alertGroupUpdate);
        }
      }
      STOMPUpdatePublisher.publish(new AlertGroupsUpdateEvent(alertGroupUpdates, UpdateEventType.UPDATE));
    }
  }
  