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.io.Serializable;
  import java.util.Map;
  import java.util.SortedMap;
  
  /**
   * Provides JMX enabled attributes and operations implemented by {@link DiagnosticEventService}.
   */
  public interface DiagnosticEventServiceMBean
  {
      /*
       * Indicates if any events will be published.
       */
      boolean isDiagnosticsEnabled();
  
      /**
       * Kill switch for disabling all events immediately, without restarting the node. Please edit cassandra.yaml for
       * making this permanent.
       */
      void disableDiagnostics();
  
      /**
       * Retrieved all events of specified type starting with provided key. Result will be sorted chronologically.
       *
       * @param eventClazz fqn of event class
       * @param lastKey ID of first event to retrieve
       * @param limit number of results to return
       */
      SortedMap<Long, Map<String, Serializable>> readEvents(String eventClazz, Long lastKey, int limit);
  
      /**
       * Start storing events to make them available via {@link #readEvents(String, Long, int)}.
       */
      void enableEventPersistence(String eventClazz);
  
      /**
       * Stop storing events.
       */
      void disableEventPersistence(String eventClazz);
  }
  