content: /*
   * Copyright The OpenTelemetry Authors
   * SPDX-License-Identifier: Apache-2.0
   */
  
  package io.opentelemetry.javaagent.instrumentation.pulsar.v2_8;
  
  import static io.opentelemetry.javaagent.instrumentation.pulsar.v2_8.telemetry.PulsarSingletons.consumerProcessInstrumenter;
  import static net.bytebuddy.matcher.ElementMatchers.isMethod;
  import static net.bytebuddy.matcher.ElementMatchers.isPublic;
  import static net.bytebuddy.matcher.ElementMatchers.named;
  
  import io.opentelemetry.context.Context;
  import io.opentelemetry.context.Scope;
  import io.opentelemetry.instrumentation.api.instrumenter.Instrumenter;
  import io.opentelemetry.javaagent.extension.instrumentation.TypeInstrumentation;
  import io.opentelemetry.javaagent.extension.instrumentation.TypeTransformer;
  import io.opentelemetry.javaagent.instrumentation.pulsar.v2_8.telemetry.PulsarRequest;
  import net.bytebuddy.asm.Advice;
  import net.bytebuddy.description.type.TypeDescription;
  import net.bytebuddy.implementation.bytecode.assign.Assigner;
  import net.bytebuddy.matcher.ElementMatcher;
  import org.apache.pulsar.client.api.Consumer;
  import org.apache.pulsar.client.api.Message;
  import org.apache.pulsar.client.api.MessageListener;
  import org.apache.pulsar.client.impl.conf.ConsumerConfigurationData;
  
  public class MessageListenerInstrumentation implements TypeInstrumentation {
  
    @Override
    public ElementMatcher<TypeDescription> typeMatcher() {
      // return hasSuperType(named("org.apache.pulsar.client.api.MessageListener"));
      // can't enhance MessageListener here like above due to jvm can't enhance lambda.
      return named("org.apache.pulsar.client.impl.conf.ConsumerConfigurationData");
    }
  
    @Override
    public void transform(TypeTransformer transformer) {
      transformer.applyAdviceToMethod(
          isMethod().and(isPublic()).and(named("getMessageListener")),
          MessageListenerInstrumentation.class.getName() + "$ConsumerConfigurationDataMethodAdvice");
    }
  
    @SuppressWarnings("unused")
    public static class ConsumerConfigurationDataMethodAdvice {
  
      @Advice.OnMethodExit(suppress = Throwable.class)
      public static void after(
          @Advice.This ConsumerConfigurationData<?> data,
          @Advice.Return(readOnly = false, typing = Assigner.Typing.DYNAMIC)
              MessageListener<?> listener) {
        if (listener == null) {
          return;
        }
  
        listener = new MessageListenerWrapper<>(listener);
      }
    }
  
    public static class MessageListenerWrapper<T> implements MessageListener<T> {
      private static final long serialVersionUID = 1L;
  
      private final MessageListener<T> delegate;
  
      public MessageListenerWrapper(MessageListener<T> messageListener) {
        this.delegate = messageListener;
      }
  
      @Override
      public void received(Consumer<T> consumer, Message<T> message) {
        Context parent = VirtualFieldStore.extract(message);
  
        Instrumenter<PulsarRequest, Void> instrumenter = consumerProcessInstrumenter();
        PulsarRequest request = PulsarRequest.create(message);
        if (!instrumenter.shouldStart(parent, request)) {
          this.delegate.received(consumer, message);
          return;
        }
  
        Context current = instrumenter.start(parent, request);
        try (Scope scope = current.makeCurrent()) {
          this.delegate.received(consumer, message);
          instrumenter.end(current, request, null, null);
        } catch (Throwable t) {
          instrumenter.end(current, request, null, t);
          throw t;
        }
      }
  
      @Override
      public void reachedEndOfTopic(Consumer<T> consumer) {
        this.delegate.reachedEndOfTopic(consumer);
      }
    }
  }
  