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;
  
  import org.apache.kafka.clients.consumer.Consumer;
  import org.apache.kafka.clients.consumer.internals.metrics.KafkaConsumerMetrics;
  import org.apache.kafka.common.metrics.Metrics;
  import org.apache.kafka.common.utils.Timer;
  
  /**
   * This extension interface provides a handful of methods to expose internals of the {@link Consumer} for
   * various tests.
   *
   * <p/>
   *
   * <em>Note</em>: this is for internal use only and is not intended for use by end users. Internal users should
   * not attempt to determine the underlying implementation to avoid coding to an unstable interface. Rather, it is
   * the {@link Consumer} API contract that should serve as the caller's interface.
   */
  public interface ConsumerDelegate<K, V> extends Consumer<K, V> {
  
      String clientId();
  
      Metrics metricsRegistry();
  
      KafkaConsumerMetrics kafkaConsumerMetrics();
  
      boolean updateAssignmentMetadataIfNeeded(final Timer timer);
  }
  