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.cassandra.diag;
  
  import java.util.Map;
  
  /**
   * Provides a list of event types and the corresponding highest event IDs. Consumers may these IDs to determine
   * if new data is available.
   *
   * <p>Example result</p>
   *
   * <table>
   *     <tr>
   *         <th>Event</th>
   *         <th>Last ID</th>
   *     </tr>
   *     <tr>
   *         <td>BootstrapEvent</td>
   *         <td>312</td>
   *     </tr>
   *     <tr>
   *         <td>CompactionEvent</td>
   *         <td>a53f9338-5f24-11e8-9c2d-fa7ae01bbebc</td>
   *     </tr>
   * </table>
   *
   * <p>Clients may either retrieve the current list of all events IDs, or make conditional requests for event IDs
   * based on the timestamp of the last update (much in the sense of e.g. HTTP's If-Modified-Since semantics).</p>
   */
  public interface LastEventIdBroadcasterMBean
  {
      /**
       * Retrieves a list of all event types and their highest IDs.
       */
      Map<String, Comparable> getLastEventIds();
  
      /**
       * Retrieves a list of all event types and their highest IDs, if updated since specified timestamp, or null.
       * @param lastUpdate timestamp to use to determine if IDs have been updated
       */
      Map<String, Comparable> getLastEventIdsIfModified(long lastUpdate);
  }
  