content: /*
   * Copyright The OpenTelemetry Authors
   * SPDX-License-Identifier: Apache-2.0
   */
  
  package io.opentelemetry.instrumentation.kafkaclients.common.v0_11.internal;
  
  import io.opentelemetry.instrumentation.api.incubator.semconv.messaging.MessagingAttributesGetter;
  import java.nio.charset.StandardCharsets;
  import java.util.List;
  import java.util.Set;
  import java.util.stream.Collectors;
  import java.util.stream.StreamSupport;
  import javax.annotation.Nullable;
  import org.apache.kafka.common.TopicPartition;
  
  enum KafkaReceiveAttributesGetter implements MessagingAttributesGetter<KafkaReceiveRequest, Void> {
    INSTANCE;
  
    @Override
    public String getSystem(KafkaReceiveRequest request) {
      return "kafka";
    }
  
    @Override
    @Nullable
    public String getDestination(KafkaReceiveRequest request) {
      Set<String> topics =
          request.getRecords().partitions().stream()
              .map(TopicPartition::topic)
              .collect(Collectors.toSet());
      // only return topic when there's exactly one in the batch
      return topics.size() == 1 ? topics.iterator().next() : null;
    }
  
    @Nullable
    @Override
    public String getDestinationTemplate(KafkaReceiveRequest request) {
      return null;
    }
  
    @Override
    public boolean isTemporaryDestination(KafkaReceiveRequest request) {
      return false;
    }
  
    @Override
    public boolean isAnonymousDestination(KafkaReceiveRequest request) {
      return false;
    }
  
    @Override
    @Nullable
    public String getConversationId(KafkaReceiveRequest request) {
      return null;
    }
  
    @Nullable
    @Override
    public Long getMessageBodySize(KafkaReceiveRequest request) {
      return null;
    }
  
    @Nullable
    @Override
    public Long getMessageEnvelopeSize(KafkaReceiveRequest request) {
      return null;
    }
  
    @Override
    @Nullable
    public String getMessageId(KafkaReceiveRequest request, @Nullable Void unused) {
      return null;
    }
  
    @Nullable
    @Override
    public String getClientId(KafkaReceiveRequest request) {
      return request.getClientId();
    }
  
    @Override
    public Long getBatchMessageCount(KafkaReceiveRequest request, @Nullable Void unused) {
      return (long) request.getRecords().count();
    }
  
    @Override
    public List<String> getMessageHeader(KafkaReceiveRequest request, String name) {
      return StreamSupport.stream(request.getRecords().spliterator(), false)
          .flatMap(
              consumerRecord ->
                  StreamSupport.stream(consumerRecord.headers().headers(name).spliterator(), false))
          .map(header -> new String(header.value(), StandardCharsets.UTF_8))
          .collect(Collectors.toList());
    }
  }
  