content: /*
   * Copyright The OpenTelemetry Authors
   * SPDX-License-Identifier: Apache-2.0
   */
  
  package io.opentelemetry.javaagent.instrumentation.kafkastreams;
  
  import static io.opentelemetry.javaagent.bootstrap.Java8BytecodeBridge.currentContext;
  import static io.opentelemetry.javaagent.instrumentation.kafkastreams.KafkaStreamsSingletons.instrumenter;
  import static io.opentelemetry.javaagent.instrumentation.kafkastreams.StateHolder.HOLDER;
  import static net.bytebuddy.matcher.ElementMatchers.isMethod;
  import static net.bytebuddy.matcher.ElementMatchers.isPackagePrivate;
  import static net.bytebuddy.matcher.ElementMatchers.named;
  import static net.bytebuddy.matcher.ElementMatchers.returns;
  
  import io.opentelemetry.context.Context;
  import io.opentelemetry.instrumentation.kafkaclients.common.v0_11.internal.KafkaConsumerContext;
  import io.opentelemetry.instrumentation.kafkaclients.common.v0_11.internal.KafkaConsumerContextUtil;
  import io.opentelemetry.instrumentation.kafkaclients.common.v0_11.internal.KafkaProcessRequest;
  import io.opentelemetry.javaagent.extension.instrumentation.TypeInstrumentation;
  import io.opentelemetry.javaagent.extension.instrumentation.TypeTransformer;
  import net.bytebuddy.asm.Advice;
  import net.bytebuddy.description.type.TypeDescription;
  import net.bytebuddy.matcher.ElementMatcher;
  import org.apache.kafka.streams.processor.internals.StampedRecord;
  
  // the advice applied by this instrumentation actually starts the span
  public class PartitionGroupInstrumentation implements TypeInstrumentation {
  
    @Override
    public ElementMatcher<TypeDescription> typeMatcher() {
      return named("org.apache.kafka.streams.processor.internals.PartitionGroup");
    }
  
    @Override
    public void transform(TypeTransformer transformer) {
      transformer.applyAdviceToMethod(
          isMethod()
              .and(isPackagePrivate())
              .and(named("nextRecord"))
              .and(returns(named("org.apache.kafka.streams.processor.internals.StampedRecord"))),
          PartitionGroupInstrumentation.class.getName() + "$NextRecordAdvice");
    }
  
    @SuppressWarnings("unused")
    public static class NextRecordAdvice {
  
      @Advice.OnMethodExit(suppress = Throwable.class)
      public static void onExit(@Advice.Return StampedRecord record) {
        if (record == null) {
          return;
        }
  
        StateHolder holder = HOLDER.get();
        if (holder == null) {
          // somehow nextRecord() was called outside of process()
          return;
        }
  
        KafkaConsumerContext consumerContext = KafkaConsumerContextUtil.get(record.value);
        Context receiveContext = consumerContext.getContext();
  
        // use the receive CONSUMER span as parent if it's available
        Context parentContext = receiveContext != null ? receiveContext : currentContext();
        KafkaProcessRequest request = KafkaProcessRequest.create(consumerContext, record.value);
  
        if (!instrumenter().shouldStart(parentContext, request)) {
          return;
        }
        Context context = instrumenter().start(parentContext, request);
        holder.set(request, context, context.makeCurrent());
      }
    }
  }
  