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.kafka.clients.consumer.internals.events;
  
  import org.apache.kafka.clients.consumer.internals.AsyncKafkaConsumer;
  import org.apache.kafka.clients.consumer.internals.ShareConsumerImpl;
  
  import java.util.Objects;
  
  /**
   * This is the abstract definition of the events created by the {@link AsyncKafkaConsumer} and
   * {@link ShareConsumerImpl} on the user's application thread.
   */
  public abstract class ApplicationEvent {
  
      public enum Type {
          COMMIT_ASYNC, COMMIT_SYNC, POLL, FETCH_COMMITTED_OFFSETS, NEW_TOPICS_METADATA_UPDATE, ASSIGNMENT_CHANGE,
          LIST_OFFSETS, CHECK_AND_UPDATE_POSITIONS, RESET_OFFSET, TOPIC_METADATA, ALL_TOPICS_METADATA,
          TOPIC_SUBSCRIPTION_CHANGE, TOPIC_PATTERN_SUBSCRIPTION_CHANGE, TOPIC_RE2J_PATTERN_SUBSCRIPTION_CHANGE,
          UPDATE_SUBSCRIPTION_METADATA, UNSUBSCRIBE,
          CONSUMER_REBALANCE_LISTENER_CALLBACK_COMPLETED,
          COMMIT_ON_CLOSE, CREATE_FETCH_REQUESTS, LEAVE_GROUP_ON_CLOSE, STOP_FIND_COORDINATOR_ON_CLOSE,
          PAUSE_PARTITIONS, RESUME_PARTITIONS, CURRENT_LAG,
          SHARE_FETCH, SHARE_ACKNOWLEDGE_ASYNC, SHARE_ACKNOWLEDGE_SYNC,
          SHARE_SUBSCRIPTION_CHANGE, SHARE_UNSUBSCRIBE,
          SHARE_ACKNOWLEDGE_ON_CLOSE,
          SHARE_ACKNOWLEDGEMENT_COMMIT_CALLBACK_REGISTRATION,
          SEEK_UNVALIDATED,
          STREAMS_ON_TASKS_ASSIGNED_CALLBACK_COMPLETED,
          STREAMS_ON_TASKS_REVOKED_CALLBACK_COMPLETED,
          STREAMS_ON_ALL_TASKS_LOST_CALLBACK_COMPLETED,
      }
  
      private final Type type;
  
      /**
       * The time in milliseconds when this event was enqueued.
       * This field can be changed after the event is created, so it should not be used in hashCode or equals.
       */
      private long enqueuedMs;
  
      protected ApplicationEvent(Type type) {
          this.type = Objects.requireNonNull(type);
      }
  
      public Type type() {
          return type;
      }
  
      public void setEnqueuedMs(long enqueuedMs) {
          this.enqueuedMs = enqueuedMs;
      }
  
      public long enqueuedMs() {
          return enqueuedMs;
      }
  
      protected String toStringBase() {
          return "type=" + type + ", enqueuedMs=" + enqueuedMs;
      }
  
      @Override
      public final String toString() {
          return getClass().getSimpleName() + "{" + toStringBase() + "}";
      }
  }
  