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.producer.ProducerConfig;
  import org.apache.kafka.clients.producer.ProducerInterceptor;
  import org.apache.kafka.clients.producer.ProducerRecord;
  import org.apache.kafka.clients.producer.RecordMetadata;
  import org.apache.kafka.common.ClusterResource;
  import org.apache.kafka.common.ClusterResourceListener;
  import org.apache.kafka.common.config.ConfigException;
  
  import java.util.Map;
  import java.util.concurrent.atomic.AtomicInteger;
  import java.util.concurrent.atomic.AtomicReference;
  
  public class MockProducerInterceptor implements ClusterResourceListener, ProducerInterceptor<String, String> {
      public static final AtomicInteger INIT_COUNT = new AtomicInteger(0);
      public static final AtomicInteger CLOSE_COUNT = new AtomicInteger(0);
      public static final AtomicInteger ONSEND_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 AtomicInteger ON_SUCCESS_COUNT = new AtomicInteger(0);
      public static final AtomicInteger ON_ERROR_COUNT = new AtomicInteger(0);
      public static final AtomicInteger ON_ERROR_WITH_METADATA_COUNT = new AtomicInteger(0);
      public static final AtomicInteger ON_ACKNOWLEDGEMENT_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_ON_ACKNOWLEDGEMENT = new AtomicReference<>(NO_CLUSTER_ID);
      public static final String APPEND_STRING_PROP = "mock.interceptor.append";
      private String appendStr;
  
      public MockProducerInterceptor() {
          INIT_COUNT.incrementAndGet();
      }
  
      @Override
      public void configure(Map<String, ?> configs) {
          // ensure this method is called and expected configs are passed in
          Object o = configs.get(APPEND_STRING_PROP);
          if (o == null)
              throw new ConfigException("Mock producer interceptor expects configuration " + APPEND_STRING_PROP);
          if (o instanceof String)
              appendStr = (String) o;
  
          // clientId also must be in configs
          Object clientIdValue = configs.get(ProducerConfig.CLIENT_ID_CONFIG);
          if (clientIdValue == null)
              throw new ConfigException("Mock producer 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 ProducerRecord<String, String> onSend(ProducerRecord<String, String> record) {
          ONSEND_COUNT.incrementAndGet();
          return new ProducerRecord<>(
                  record.topic(), record.partition(), record.key(), record.value().concat(appendStr));
      }
  
      @Override
      public void onAcknowledgement(RecordMetadata metadata, Exception exception) {
          ON_ACKNOWLEDGEMENT_COUNT.incrementAndGet();
          // This will ensure that we get the cluster metadata when onAcknowledgement is called for the first time
          // as subsequent compareAndSet operations will fail.
          CLUSTER_ID_BEFORE_ON_ACKNOWLEDGEMENT.compareAndSet(NO_CLUSTER_ID, CLUSTER_META.get());
  
          if (exception != null) {
              ON_ERROR_COUNT.incrementAndGet();
              if (metadata != null) {
                  ON_ERROR_WITH_METADATA_COUNT.incrementAndGet();
              }
          } else if (metadata != null)
              ON_SUCCESS_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);
          ONSEND_COUNT.set(0);
          CONFIG_COUNT.set(0);
          THROW_CONFIG_EXCEPTION.set(0);
          ON_SUCCESS_COUNT.set(0);
          ON_ERROR_COUNT.set(0);
          ON_ERROR_WITH_METADATA_COUNT.set(0);
          CLUSTER_META.set(null);
          CLUSTER_ID_BEFORE_ON_ACKNOWLEDGEMENT.set(NO_CLUSTER_ID);
      }
  
      @Override
      public void onUpdate(ClusterResource clusterResource) {
          CLUSTER_META.set(clusterResource);
      }
  }