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.streams.utils;
  
  import org.apache.kafka.common.header.Headers;
  import org.apache.kafka.common.serialization.Deserializer;
  import org.apache.kafka.common.serialization.Serde;
  import org.apache.kafka.common.serialization.Serializer;
  
  import java.util.Collections;
  import java.util.Map;
  import java.util.Properties;
  import java.util.Set;
  import java.util.TreeMap;
  import java.util.concurrent.atomic.AtomicBoolean;
  import java.util.stream.Collectors;
  
  import static org.hamcrest.MatcherAssert.assertThat;
  import static org.hamcrest.Matchers.equalTo;
  
  public class UniqueTopicSerdeScope {
      private final Map<String, Class<?>> topicTypeRegistry = new TreeMap<>();
  
      public <T> UniqueTopicSerdeDecorator<T> decorateSerde(final Serde<T> delegate,
                                                            final Properties config,
                                                            final boolean isKey) {
          final UniqueTopicSerdeDecorator<T> decorator = new UniqueTopicSerdeDecorator<>(delegate);
          decorator.configure(config.entrySet().stream().collect(Collectors.toMap(e -> e.getKey().toString(), Map.Entry::getValue)), isKey);
          return decorator;
      }
  
      public Set<String> registeredTopics() {
          return Collections.unmodifiableSet(topicTypeRegistry.keySet());
      }
  
      public class UniqueTopicSerdeDecorator<T> implements Serde<T> {
          private final AtomicBoolean isKey = new AtomicBoolean(false);
          private final Serde<T> delegate;
  
          public UniqueTopicSerdeDecorator(final Serde<T> delegate) {
              this.delegate = delegate;
          }
  
          @Override
          public void configure(final Map<String, ?> configs, final boolean isKey) {
              delegate.configure(configs, isKey);
              this.isKey.set(isKey);
          }
  
          @Override
          public void close() {
              delegate.close();
          }
  
          @Override
          public Serializer<T> serializer() {
              return new UniqueTopicSerializerDecorator<>(isKey, delegate.serializer());
          }
  
          @Override
          public Deserializer<T> deserializer() {
              return new UniqueTopicDeserializerDecorator<>(isKey, delegate.deserializer());
          }
      }
  
      public class UniqueTopicSerializerDecorator<T> implements Serializer<T> {
          private final AtomicBoolean isKey;
          private final Serializer<T> delegate;
  
          public UniqueTopicSerializerDecorator(final AtomicBoolean isKey, final Serializer<T> delegate) {
              this.isKey = isKey;
              this.delegate = delegate;
          }
  
          @Override
          public void configure(final Map<String, ?> configs, final boolean isKey) {
              delegate.configure(configs, isKey);
              this.isKey.set(isKey);
          }
  
          @Override
          public byte[] serialize(final String topic, final T data) {
              verifyTopic(topic, data);
              return delegate.serialize(topic, data);
          }
  
          @Override
          public byte[] serialize(final String topic, final Headers headers, final T data) {
              verifyTopic(topic, data);
              return delegate.serialize(topic, headers, data);
          }
  
          private void verifyTopic(final String topic, final T data) {
              if (data != null) {
                  final String key = topic + (isKey.get() ? "--key" : "--value");
                  if (topicTypeRegistry.containsKey(key)) {
                      assertThat(String.format("key[%s] data[%s][%s]", key, data, data.getClass()), topicTypeRegistry.get(key), equalTo(data.getClass()));
                  } else {
                      topicTypeRegistry.put(key, data.getClass());
                  }
              }
          }
  
          @Override
          public void close() {
              delegate.close();
          }
      }
  
      public class UniqueTopicDeserializerDecorator<T> implements Deserializer<T> {
          private final AtomicBoolean isKey;
          private final Deserializer<T> delegate;
  
          public UniqueTopicDeserializerDecorator(final AtomicBoolean isKey, final Deserializer<T> delegate) {
              this.isKey = isKey;
              this.delegate = delegate;
          }
  
          @Override
          public void configure(final Map<String, ?> configs, final boolean isKey) {
              delegate.configure(configs, isKey);
              this.isKey.set(isKey);
          }
  
          @Override
          public T deserialize(final String topic, final byte[] data) {
              return delegate.deserialize(topic, data);
          }
  
          @Override
          public T deserialize(final String topic, final Headers headers, final byte[] data) {
              return delegate.deserialize(topic, headers, data);
          }
  
          @Override
          public void close() {
              delegate.close();
          }
      }
  }
  