content: /*
   * Copyright The OpenTelemetry Authors
   * SPDX-License-Identifier: Apache-2.0
   */
  
  package io.opentelemetry.javaagent.instrumentation.spring.webflux.v5_0.client;
  
  import static io.opentelemetry.javaagent.extension.matcher.AgentElementMatchers.hasClassesNamed;
  import static io.opentelemetry.javaagent.extension.matcher.AgentElementMatchers.implementsInterface;
  import static net.bytebuddy.matcher.ElementMatchers.isMethod;
  import static net.bytebuddy.matcher.ElementMatchers.isPublic;
  import static net.bytebuddy.matcher.ElementMatchers.named;
  
  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.reactive.function.client.WebClient;
  
  public class WebClientBuilderInstrumentation implements TypeInstrumentation {
    @Override
    public ElementMatcher<ClassLoader> classLoaderOptimization() {
      return hasClassesNamed("org.springframework.web.reactive.function.client.WebClient");
    }
  
    @Override
    public ElementMatcher<TypeDescription> typeMatcher() {
      return implementsInterface(
          named("org.springframework.web.reactive.function.client.WebClient$Builder"));
    }
  
    @Override
    public void transform(TypeTransformer transformer) {
      transformer.applyAdviceToMethod(
          isMethod().and(isPublic()).and(named("build")), this.getClass().getName() + "$BuildAdvice");
    }
  
    @SuppressWarnings("unused")
    public static class BuildAdvice {
  
      @Advice.OnMethodEnter(suppress = Throwable.class)
      public static void onBuild(@Advice.This WebClient.Builder builder) {
        builder.filters(WebClientHelper::addFilter);
      }
    }
  }
  