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 static org.apache.cassandra.utils.Clock.Global.currentTimeMillis;
  
  /**
   * Base class for internally emitted events used for diagnostics and testing.
   */
  public abstract class DiagnosticEvent
  {
      /**
       * Event creation time.
       */
      public final long timestamp = currentTimeMillis();
  
      /**
       * Name of allocating thread.
       */
      public final String threadName = Thread.currentThread().getName();
  
      /**
       * Returns event type discriminator. This will usually be a enum value.
       */
      public abstract Enum<?> getType();
  
      /**
       * Returns map of key-value pairs containing relevant event details. Values can be complex objects like other
       * maps, but must be Serializable, as returned values may be consumed by external clients. It's strongly recommended
       * to stick to standard Java classes to avoid distributing custom classes to clients and also prevent potential
       * class versioning conflicts.
       */
      public abstract Map<String, Serializable> toMap();
  }
  