content: /*
   * Copyright The OpenTelemetry Authors
   * SPDX-License-Identifier: Apache-2.0
   */
  
  package io.opentelemetry.javaagent.instrumentation.playws;
  
  import static net.bytebuddy.matcher.ElementMatchers.named;
  
  import io.opentelemetry.javaagent.bootstrap.Java8BytecodeBridge;
  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.reactivestreams.Subscriber;
  
  public class HandlerPublisherInstrumentation implements TypeInstrumentation {
    @Override
    public ElementMatcher<TypeDescription> typeMatcher() {
      return named("play.shaded.ahc.com.typesafe.netty.HandlerPublisher");
    }
  
    @Override
    public void transform(TypeTransformer transformer) {
      transformer.applyAdviceToMethod(
          named("subscribe"),
          HandlerPublisherInstrumentation.class.getName() + "$WrapSubscriberAdvice");
    }
  
    @SuppressWarnings("unused")
    public static class WrapSubscriberAdvice {
  
      @Advice.OnMethodEnter(suppress = Throwable.class)
      public static void enter(
          @Advice.Argument(value = 0, readOnly = false) Subscriber<?> subscriber) {
        subscriber = new SubscriberWrapper<>(subscriber, Java8BytecodeBridge.currentContext());
      }
    }
  }
  