content: /*
   * Copyright 2014-2025 Real Logic Limited.
   *
   * Licensed 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
   *
   * https://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 io.aeron;
  
  import org.agrona.concurrent.status.CountersReader;
  
  /**
   * Interface for notification of {@link Counter}s being removed via an {@link Aeron} client.
   */
  @FunctionalInterface
  public interface UnavailableCounterHandler
  {
      /**
       * Method called by Aeron to deliver notification of counter being removed.
       * <p>
       * Within this callback reentrant calls to the {@link Aeron} client are not permitted and
       * will result in undefined behaviour.
       *
       * @param countersReader for more counter details.
       * @param registrationId for the counter.
       * @param counterId      that is unavailable.
       */
      void onUnavailableCounter(CountersReader countersReader, long registrationId, int counterId);
  }
  