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.HashMap;
  import java.util.Map;
  
  import org.apache.ambari.server.EagerSingleton;
  import org.apache.ambari.server.api.query.render.AlertSummaryGroupedRenderer;
  import org.apache.ambari.server.events.AlertDefinitionDisabledEvent;
  import org.apache.ambari.server.events.AlertUpdateEvent;
  import org.apache.ambari.server.events.publishers.AmbariEventPublisher;
  import org.apache.ambari.server.events.publishers.STOMPUpdatePublisher;
  import org.apache.ambari.server.orm.dao.AlertsDAO;
  import org.apache.ambari.server.orm.entities.AlertCurrentEntity;
  import org.slf4j.Logger;
  import org.slf4j.LoggerFactory;
  
  import com.google.common.eventbus.AllowConcurrentEvents;
  import com.google.common.eventbus.Subscribe;
  import com.google.inject.Inject;
  
  /**
   * The {@link AlertDefinitionDisabledListener} handles event relating to the
   * disabling of an alert definition.
   */
  @EagerSingleton
  public class AlertDefinitionDisabledListener {
    /**
     * Logger.
     */
    private final static Logger LOG = LoggerFactory.getLogger(AlertDefinitionDisabledListener.class);
  
    /**
     * Used for deleting the alert notices when a definition is disabled.
     */
    @Inject
    private AlertsDAO m_alertsDao = null;
  
    @Inject
    private STOMPUpdatePublisher STOMPUpdatePublisher;
  
    /**
     * Constructor.
     *
     * @param publisher
     *          the publisher to register this listener with (not {@code null}).
     */
    @Inject
    public AlertDefinitionDisabledListener(AmbariEventPublisher publisher) {
      publisher.register(this);
    }
  
    /**
     * Removes any {@link AlertCurrentEntity} instance associated with the
     * specified alert definition.
     */
    @Subscribe
    @AllowConcurrentEvents
    public void onEvent(AlertDefinitionDisabledEvent event) {
      LOG.debug("Received event {}", event);
  
      m_alertsDao.removeCurrentDisabledAlerts();
  
      // send API STOMP alert update
      Map<Long, Map<String, AlertSummaryGroupedRenderer.AlertDefinitionSummary>> alertUpdates = new HashMap<>();
      alertUpdates.put(event.getClusterId(), AlertSummaryGroupedRenderer.generateEmptySummary(event.getDefinitionId(),
          event.getDefinitionName()));
      STOMPUpdatePublisher.publish(new AlertUpdateEvent(alertUpdates));
    }
  }
  