content: /*
   * Copyright The OpenTelemetry Authors
   * SPDX-License-Identifier: Apache-2.0
   */
  
  package io.opentelemetry.javaagent.instrumentation.spring.gateway.v2_0;
  
  import static io.opentelemetry.javaagent.extension.matcher.AgentElementMatchers.hasClassesNamed;
  import static io.opentelemetry.javaagent.extension.matcher.AgentElementMatchers.implementsInterface;
  import static net.bytebuddy.matcher.ElementMatchers.isAbstract;
  import static net.bytebuddy.matcher.ElementMatchers.isMethod;
  import static net.bytebuddy.matcher.ElementMatchers.isPublic;
  import static net.bytebuddy.matcher.ElementMatchers.named;
  import static net.bytebuddy.matcher.ElementMatchers.not;
  import static net.bytebuddy.matcher.ElementMatchers.takesArgument;
  import static net.bytebuddy.matcher.ElementMatchers.takesArguments;
  
  import io.opentelemetry.context.Context;
  import io.opentelemetry.instrumentation.api.semconv.http.HttpServerRoute;
  import io.opentelemetry.instrumentation.api.semconv.http.HttpServerRouteSource;
  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.springframework.web.server.ServerWebExchange;
  
  public class HandlerAdapterInstrumentation implements TypeInstrumentation {
  
    @Override
    public ElementMatcher<ClassLoader> classLoaderOptimization() {
      return hasClassesNamed("org.springframework.web.reactive.HandlerAdapter");
    }
  
    @Override
    public ElementMatcher<TypeDescription> typeMatcher() {
      return not(isAbstract())
          .and(implementsInterface(named("org.springframework.web.reactive.HandlerAdapter")));
    }
  
    @Override
    public void transform(TypeTransformer transformer) {
      transformer.applyAdviceToMethod(
          isMethod()
              .and(isPublic())
              .and(named("handle"))
              .and(takesArgument(0, named("org.springframework.web.server.ServerWebExchange")))
              .and(takesArgument(1, Object.class))
              .and(takesArguments(2)),
          this.getClass().getName() + "$HandleAdvice");
    }
  
    @SuppressWarnings("unused")
    public static class HandleAdvice {
      @Advice.OnMethodEnter(suppress = Throwable.class)
      public static void methodEnter(@Advice.Argument(0) ServerWebExchange exchange) {
        Context context = Context.current();
        // Update route info for server span.
        HttpServerRoute.update(
            context,
            HttpServerRouteSource.NESTED_CONTROLLER,
            GatewaySingletons.httpRouteGetter(),
            exchange);
        // Record route info in server span.
        ServerWebExchangeHelper.extractAttributes(exchange, context);
      }
    }
  }
  