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   * 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 static org.apache.ambari.server.events.AlertDefinitionEventType.DELETE;
  import static org.apache.ambari.server.events.AlertDefinitionEventType.UPDATE;
  
  import java.util.Collections;
  import java.util.Map;
  
  import jakarta.inject.Provider;
  
  import org.apache.ambari.server.AmbariException;
  import org.apache.ambari.server.EagerSingleton;
  import org.apache.ambari.server.agent.stomp.AlertDefinitionsHolder;
  import org.apache.ambari.server.agent.stomp.dto.AlertCluster;
  import org.apache.ambari.server.events.AlertDefinitionChangedEvent;
  import org.apache.ambari.server.events.AlertDefinitionDeleteEvent;
  import org.apache.ambari.server.events.AlertDefinitionEventType;
  import org.apache.ambari.server.events.AlertDefinitionRegistrationEvent;
  import org.apache.ambari.server.events.AlertDefinitionsUIUpdateEvent;
  import org.apache.ambari.server.events.ServiceComponentInstalledEvent;
  import org.apache.ambari.server.events.ServiceComponentUninstalledEvent;
  import org.apache.ambari.server.events.publishers.AmbariEventPublisher;
  import org.apache.ambari.server.events.publishers.STOMPUpdatePublisher;
  import org.apache.ambari.server.state.Cluster;
  import org.apache.ambari.server.state.Clusters;
  import org.apache.ambari.server.state.Host;
  import org.apache.ambari.server.state.alert.AlertDefinition;
  import org.apache.ambari.server.state.alert.AlertDefinitionHash;
  import org.apache.ambari.server.state.alert.AlertHelper;
  import org.slf4j.Logger;
  import org.slf4j.LoggerFactory;
  
  import com.google.common.eventbus.Subscribe;
  import com.google.inject.Inject;
  import com.google.inject.Singleton;
  
  @Singleton
  @EagerSingleton
  public class AlertDefinitionsUIUpdateListener {
  
    private static final Logger LOG = LoggerFactory.getLogger(AlertDefinitionsUIUpdateListener.class);
  
    @Inject
    private Provider<AlertDefinitionHash> helper;
  
    @Inject
    private Provider<Clusters> clusters;
  
    @Inject
    private STOMPUpdatePublisher STOMPUpdatePublisher;
  
    @Inject
    private AlertDefinitionsHolder alertDefinitionsHolder;
  
    @Inject
    private AlertHelper alertHelper;
  
    @Inject
    public AlertDefinitionsUIUpdateListener(AmbariEventPublisher ambariEventPublisher) {
      ambariEventPublisher.register(this);
    }
  
    public final static String AMBARI_STALE_ALERT_NAME = "ambari_server_stale_alerts";
  
    @Subscribe
    public void onAlertDefinitionRegistered(AlertDefinitionRegistrationEvent event) throws AmbariException {
      handleSingleDefinitionChange(UPDATE, event.getDefinition());
    }
  
    @Subscribe
    public void onAlertDefinitionChanged(AlertDefinitionChangedEvent event) throws AmbariException {
      handleSingleDefinitionChange(UPDATE, event.getDefinition());
    }
  
    @Subscribe
    public void onAlertDefinitionDeleted(AlertDefinitionDeleteEvent event) throws AmbariException {
      handleSingleDefinitionChange(DELETE, event.getDefinition());
    }
  
    @Subscribe
    public void onServiceComponentInstalled(ServiceComponentInstalledEvent event) throws AmbariException {
      String hostName = event.getHostName();
      String serviceName = event.getServiceName();
      String componentName = event.getComponentName();
  
      Map<Long, AlertDefinition> definitions = helper.get().findByServiceComponent(event.getClusterId(), serviceName, componentName);
  
      if (event.isMasterComponent()) {
        try {
          Cluster cluster = clusters.get().getClusterById(event.getClusterId());
          if (cluster.getService(serviceName).getServiceComponents().get(componentName).getServiceComponentHosts().containsKey(hostName)) {
            definitions.putAll(helper.get().findByServiceMaster(event.getClusterId(), serviceName));
          }
        } catch (AmbariException e) {
          String msg = String.format("Failed to get alert definitions for master component %s/%s", serviceName, componentName);
          LOG.warn(msg, e);
        }
      }
      if (!definitions.isEmpty()) {
        alertDefinitionsHolder.provideAlertDefinitionAgentUpdateEvent(UPDATE, event.getClusterId(), definitions, hostName);
        Map<Long, AlertCluster> map = Collections.singletonMap(event.getClusterId(), new AlertCluster(definitions, hostName));
        STOMPUpdatePublisher.publish(new AlertDefinitionsUIUpdateEvent(UPDATE, map));
      }
    }
  
    @Subscribe
    public void onServiceComponentUninstalled(ServiceComponentUninstalledEvent event) throws AmbariException {
      String hostName = event.getHostName();
      Map<Long, AlertDefinition> definitions = helper.get().findByServiceComponent(event.getClusterId(), event.getServiceName(), event.getComponentName());
      if (event.isMasterComponent()) {
        definitions.putAll(helper.get().findByServiceMaster(event.getClusterId(), event.getServiceName()));
      }
      if (!definitions.isEmpty()) {
        alertDefinitionsHolder.provideAlertDefinitionAgentUpdateEvent(DELETE, event.getClusterId(), definitions, hostName);
        Map<Long, AlertCluster> map = Collections.singletonMap(event.getClusterId(), new AlertCluster(definitions, hostName));
        STOMPUpdatePublisher.publish(new AlertDefinitionsUIUpdateEvent(DELETE, map));
      }
    }
  
    private void handleSingleDefinitionChange(AlertDefinitionEventType eventType, AlertDefinition alertDefinition) throws AmbariException {
      LOG.info("{} alert definition '{}'", eventType, alertDefinition);
      Cluster cluster = clusters.get().getCluster(alertDefinition.getClusterId());
      helper.get().invalidateHosts(alertDefinition); // do we need to invalidate, what's the purpose of this?
      for (String hostName : alertDefinition.matchingHosts(clusters.get())) {
        alertDefinitionsHolder.provideAlertDefinitionAgentUpdateEvent(eventType, alertDefinition.getClusterId(),
            Collections.singletonMap(alertDefinition.getDefinitionId(), alertDefinition), hostName);
      }
      if (alertDefinition.getName().equals(AMBARI_STALE_ALERT_NAME)) {
        for (Host host : cluster.getHosts()) {
          alertDefinitionsHolder.provideStaleAlertDefinitionUpdateEvent(eventType, alertDefinition.getClusterId(),
              alertHelper.getWaitFactorMultiplier(alertDefinition), host.getHostName());
        }
      }
      Map<Long, AlertCluster> update = Collections.singletonMap(alertDefinition.getClusterId(), new AlertCluster(alertDefinition, null));
      AlertDefinitionsUIUpdateEvent event = new AlertDefinitionsUIUpdateEvent(eventType, update);
      STOMPUpdatePublisher.publish(event);
    }
  }
  