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;
  
  import java.util.ArrayList;
  import java.util.Collections;
  import java.util.HashMap;
  import java.util.List;
  import java.util.Map;
  
  import com.google.common.eventbus.EventBus;
  import com.google.common.eventbus.Subscribe;
  import com.google.inject.Singleton;
  
  /**
   * The {@link MockEventListener} is used to provide a way to capture events
   * being fired via an {@link EventBus}.
   */
  @Singleton
  public class MockEventListener {
  
    /**
     * When an event is received, its class is captured and the event object is
     * added to the list.
     */
    private final Map<Class<?>, List<AmbariEvent>> m_receivedAmbariEvents = new HashMap<>();
  
    /**
     * When an event is received, its class is captured and the event object is
     * added to the list.
     */
    private final Map<Class<?>, List<AlertEvent>> m_receivedAlertEvents = new HashMap<>();
  
    /**
     * Resets the captured events.
     */
    public void reset() {
      m_receivedAmbariEvents.clear();
      m_receivedAlertEvents.clear();
    }
  
    /**
     * Gets whether an event of the specified class was received.
     *
     * @param clazz
     * @return
     */
    public boolean isAmbariEventReceived(Class<? extends AmbariEvent> clazz) {
      if (!m_receivedAmbariEvents.containsKey(clazz)) {
        return false;
      }
  
      return m_receivedAmbariEvents.get(clazz).size() > 0;
    }
  
    /**
     * Gets whether an event of the specified class was received.
     *
     * @param clazz
     * @return
     */
    public boolean isAlertEventReceived(Class<? extends AlertEvent> clazz) {
      if (!m_receivedAlertEvents.containsKey(clazz)) {
        return false;
      }
  
      return m_receivedAlertEvents.get(clazz).size() > 0;
    }
  
    /**
     * Gets the total number of events received for the specified class.
     *
     * @param clazz
     * @return
     */
    public int getAmbariEventReceivedCount(Class<? extends AmbariEvent> clazz) {
      if (!m_receivedAmbariEvents.containsKey(clazz)) {
        return 0;
      }
  
      return m_receivedAmbariEvents.get(clazz).size();
    }
  
    /**
     * Gets the total number of events received for the specified class.
     *
     * @param clazz
     * @return
     */
    public int getAlertEventReceivedCount(Class<? extends AlertEvent> clazz) {
      if (!m_receivedAlertEvents.containsKey(clazz)) {
        return 0;
      }
  
      return m_receivedAlertEvents.get(clazz).size();
    }
  
  
    /**
     * Get the instances
     *
     * @param clazz
     * @return
     */
    public List<AmbariEvent> getAmbariEventInstances(Class<? extends AmbariEvent> clazz){
      if (!m_receivedAmbariEvents.containsKey(clazz)) {
        return Collections.emptyList();
      }
  
      return m_receivedAmbariEvents.get(clazz);
    }
  
    /**
     * Get the instances
     *
     * @param clazz
     * @return
     */
    public List<AlertEvent> getAlertEventInstances(Class<? extends AlertEvent> clazz){
      if (!m_receivedAlertEvents.containsKey(clazz)) {
        return Collections.emptyList();
      }
  
      return m_receivedAlertEvents.get(clazz);
    }
  
    /**
     * @param event
     */
    @Subscribe
    public void onAmbariEvent(AmbariEvent event) {
      List<AmbariEvent> events = m_receivedAmbariEvents.get(event.getClass());
      if (null == events) {
        events = new ArrayList<>();
        m_receivedAmbariEvents.put(event.getClass(), events);
      }
  
      events.add(event);
    }
  
    /**
     * @param event
     */
    @Subscribe
    public void onAlertEvent(AlertEvent event) {
      List<AlertEvent> events = m_receivedAlertEvents.get(event.getClass());
      if (null == events) {
        events = new ArrayList<>();
        m_receivedAlertEvents.put(event.getClass(), events);
      }
  
      events.add(event);
    }
  }
  