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.common.ClusterResource;
  import org.apache.kafka.common.ClusterResourceListener;
  import org.apache.kafka.common.serialization.Serializer;
  
  import java.nio.charset.StandardCharsets;
  import java.util.concurrent.atomic.AtomicInteger;
  import java.util.concurrent.atomic.AtomicReference;
  
  public class MockSerializer implements ClusterResourceListener, Serializer<String> {
      public static final AtomicInteger INIT_COUNT = new AtomicInteger(0);
      public static final AtomicInteger CLOSE_COUNT = 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_SERIALIZE = new AtomicReference<>(NO_CLUSTER_ID);
  
      public MockSerializer() {
          INIT_COUNT.incrementAndGet();
      }
  
      @Override
      public byte[] serialize(String topic, String data) {
          // This will ensure that we get the cluster metadata when serialize is called for the first time
          // as subsequent compareAndSet operations will fail.
          CLUSTER_ID_BEFORE_SERIALIZE.compareAndSet(NO_CLUSTER_ID, CLUSTER_META.get());
          if (data == null) return null;
          return data.getBytes(StandardCharsets.UTF_8);
      }
  
      @Override
      public void close() {
          CLOSE_COUNT.incrementAndGet();
      }
  
      @Override
      public void onUpdate(ClusterResource clusterResource) {
          CLUSTER_META.set(clusterResource);
      }
  }
  