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.view;
  
  import org.apache.ambari.view.events.Listener;
  
  import java.util.Map;
  
  /**
   * View controller.
   */
  public interface ViewController {
    /**
     * Notify all listeners registered to listen to this view
     * of the given view event.
     *
     * @param eventId          the event id
     * @param eventProperties  the event properties
     */
    public void fireEvent(String eventId, Map<String, String> eventProperties);
  
    /**
     * Register a listener to listen for events from the view identified by the
     * given name.
     *
     * @param listener  the listener
     * @param viewName  the view to listen to
     */
    public void registerListener(Listener listener, String viewName);
  
    /**
     * Register a listener to listen for events from the view identified by the
     * given name and version.
     *
     * @param listener     the listener
     * @param viewName     the view to listen to
     * @param viewVersion  the view version
     */
    public void registerListener(Listener listener, String viewName, String viewVersion);
  
    /**
     * Un-register the listener that is registered for the view identified by the
     * given name.
     *
     * @param listener  the listener
     * @param viewName  the view to listen to
     */
    public void unregisterListener(Listener listener, String viewName);
  
    /**
     * Un-register the listener that is registered for the view identified by the
     * given name and version.
     *
     * @param listener     the listener
     * @param viewName     the view to listen to
     * @param viewVersion  the view version
     */
    public void unregisterListener(Listener listener, String viewName, String viewVersion);
  }
  