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.test;
  
  import org.apache.kafka.clients.consumer.ConsumerConfig;
  import org.apache.kafka.clients.consumer.ConsumerInterceptor;
  import org.apache.kafka.clients.consumer.ConsumerRecord;
  import org.apache.kafka.clients.consumer.ConsumerRecords;
  import org.apache.kafka.clients.consumer.OffsetAndMetadata;
  import org.apache.kafka.clients.producer.ProducerConfig;
  import org.apache.kafka.common.ClusterResource;
  import org.apache.kafka.common.ClusterResourceListener;
  import org.apache.kafka.common.TopicPartition;
  import org.apache.kafka.common.config.ConfigException;
  import org.apache.kafka.common.header.internals.RecordHeaders;
  
  import java.util.ArrayList;
  import java.util.HashMap;
  import java.util.List;
  import java.util.Locale;
  import java.util.Map;
  import java.util.Optional;
  import java.util.concurrent.atomic.AtomicInteger;
  import java.util.concurrent.atomic.AtomicReference;
  
  public class MockConsumerInterceptor implements ClusterResourceListener, ConsumerInterceptor<String, String> {
      public static final AtomicInteger INIT_COUNT = new AtomicInteger(0);
      public static final AtomicInteger CLOSE_COUNT = new AtomicInteger(0);
      public static final AtomicInteger ON_COMMIT_COUNT = new AtomicInteger(0);
      public static final AtomicInteger CONFIG_COUNT = new AtomicInteger(0);
      public static final AtomicInteger THROW_CONFIG_EXCEPTION = new AtomicInteger(0);
      public static final AtomicInteger THROW_ON_CONFIG_EXCEPTION_THRESHOLD = new AtomicInteger(0);
      public static final AtomicReference<ClusterResource> CLUSTER_META = new AtomicReference<>();
      public static final ClusterResource NO_CLUSTER_ID = new ClusterResource("no_cluster_id");
      public static final AtomicReference<ClusterResource> CLUSTER_ID_BEFORE_ON_CONSUME = new AtomicReference<>(NO_CLUSTER_ID);
  
      public MockConsumerInterceptor() {
          INIT_COUNT.incrementAndGet();
      }
  
      @Override
      public void configure(Map<String, ?> configs) {
          // clientId must be in configs
          Object clientIdValue = configs.get(ConsumerConfig.CLIENT_ID_CONFIG);
          if (clientIdValue == null)
              throw new ConfigException("Mock consumer interceptor expects configuration " + ProducerConfig.CLIENT_ID_CONFIG);
  
          CONFIG_COUNT.incrementAndGet();
          if (CONFIG_COUNT.get() == THROW_ON_CONFIG_EXCEPTION_THRESHOLD.get()) {
              throw new ConfigException("Failed to instantiate interceptor. Reached configuration exception threshold.");
          }
      }
  
      @Override
      public ConsumerRecords<String, String> onConsume(ConsumerRecords<String, String> records) {
  
          // This will ensure that we get the cluster metadata when onConsume is called for the first time
          // as subsequent compareAndSet operations will fail.
          CLUSTER_ID_BEFORE_ON_CONSUME.compareAndSet(NO_CLUSTER_ID, CLUSTER_META.get());
  
          Map<TopicPartition, List<ConsumerRecord<String, String>>> recordMap = new HashMap<>();
          Map<TopicPartition, OffsetAndMetadata> nextOffsets = new HashMap<>();
  
          for (TopicPartition tp : records.partitions()) {
              List<ConsumerRecord<String, String>> lst = new ArrayList<>();
              long nextOffset = 0;
              for (ConsumerRecord<String, String> record: records.records(tp)) {
                  lst.add(new ConsumerRecord<>(record.topic(), record.partition(), record.offset(),
                                               record.timestamp(), record.timestampType(),
                                               record.serializedKeySize(),
                                               record.serializedValueSize(),
                                               record.key(), record.value().toUpperCase(Locale.ROOT),
                                               new RecordHeaders(), Optional.empty()));
                  nextOffset = record.offset() + 1;
              }
              if (lst.isEmpty()) {
                  recordMap.put(tp, List.of());
              } else {
                  recordMap.put(tp, lst);
                  nextOffsets.put(tp, new OffsetAndMetadata(nextOffset, Optional.empty(), ""));
              }
          }
          return new ConsumerRecords<>(recordMap, nextOffsets);
      }
  
      @Override
      public void onCommit(Map<TopicPartition, OffsetAndMetadata> offsets) {
          ON_COMMIT_COUNT.incrementAndGet();
      }
  
      @Override
      public void close() {
          CLOSE_COUNT.incrementAndGet();
      }
  
      public static void setThrowOnConfigExceptionThreshold(int value) {
          THROW_ON_CONFIG_EXCEPTION_THRESHOLD.set(value);
      }
  
      public static void resetCounters() {
          INIT_COUNT.set(0);
          CLOSE_COUNT.set(0);
          ON_COMMIT_COUNT.set(0);
          CONFIG_COUNT.set(0);
          THROW_CONFIG_EXCEPTION.set(0);
          CLUSTER_META.set(null);
          CLUSTER_ID_BEFORE_ON_CONSUME.set(NO_CLUSTER_ID);
      }
  
      @Override
      public void onUpdate(ClusterResource clusterResource) {
          CLUSTER_META.set(clusterResource);
      }
  }
  