content: /*
   * Copyright The OpenTelemetry Authors
   * SPDX-License-Identifier: Apache-2.0
   */
  
  package io.opentelemetry.javaagent.instrumentation.kafkastreams;
  
  import static io.opentelemetry.javaagent.instrumentation.kafkastreams.KafkaStreamsSingletons.instrumenter;
  import static io.opentelemetry.javaagent.instrumentation.kafkastreams.StateHolder.HOLDER;
  import static net.bytebuddy.matcher.ElementMatchers.isPublic;
  import static net.bytebuddy.matcher.ElementMatchers.named;
  
  import io.opentelemetry.context.Context;
  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;
  
  public class StreamTaskInstrumentation implements TypeInstrumentation {
  
    @Override
    public ElementMatcher<TypeDescription> typeMatcher() {
      return named("org.apache.kafka.streams.processor.internals.StreamTask");
    }
  
    @Override
    public void transform(TypeTransformer transformer) {
      transformer.applyAdviceToMethod(
          named("process").and(isPublic()),
          StreamTaskInstrumentation.class.getName() + "$ProcessAdvice");
    }
  
    // the method decorated by this advice calls PartitionGroup.nextRecord(), which triggers
    // PartitionGroupInstrumentation that actually starts the span
    @SuppressWarnings("unused")
    public static class ProcessAdvice {
  
      @Advice.OnMethodEnter
      public static StateHolder onEnter() {
        StateHolder holder = new StateHolder();
        HOLDER.set(holder);
        return holder;
      }
  
      @Advice.OnMethodExit(onThrowable = Throwable.class, suppress = Throwable.class)
      public static void stopSpan(
          @Advice.Enter StateHolder holder, @Advice.Thrown Throwable throwable) {
        HOLDER.remove();
  
        Context context = holder.getContext();
        if (context != null) {
          holder.closeScope();
          instrumenter().end(context, holder.getRequest(), null, throwable);
        }
      }
    }
  }
  