content: /*
   * Copyright The OpenTelemetry Authors
   * SPDX-License-Identifier: Apache-2.0
   */
  
  package io.opentelemetry.javaagent.instrumentation.reactornetty.v1_0;
  
  import static io.opentelemetry.javaagent.extension.matcher.AgentElementMatchers.hasClassesNamed;
  import static java.util.Arrays.asList;
  import static java.util.Collections.singletonList;
  
  import com.google.auto.service.AutoService;
  import io.opentelemetry.javaagent.extension.instrumentation.InstrumentationModule;
  import io.opentelemetry.javaagent.extension.instrumentation.TypeInstrumentation;
  import io.opentelemetry.javaagent.extension.instrumentation.internal.ExperimentalInstrumentationModule;
  import java.util.List;
  import java.util.function.BiConsumer;
  import java.util.function.Function;
  import net.bytebuddy.matcher.ElementMatcher;
  import reactor.netty.http.client.HttpClient;
  
  /**
   * This instrumentation solves the problem of the correct context propagation through the roller
   * coaster of Project Reactor and Netty thread hopping. It uses two public hooks of {@link
   * HttpClient}: {@link HttpClient#mapConnect(Function)} and {@link
   * HttpClient#doOnRequest(BiConsumer)} to pass context from the caller to Reactor to Netty.
   */
  @AutoService(InstrumentationModule.class)
  public class ReactorNettyInstrumentationModule extends InstrumentationModule
      implements ExperimentalInstrumentationModule {
  
    public ReactorNettyInstrumentationModule() {
      super("reactor-netty", "reactor-netty-1.0");
    }
  
    @Override
    public ElementMatcher.Junction<ClassLoader> classLoaderMatcher() {
      // Introduced in 1.0.0
      return hasClassesNamed("reactor.netty.transport.AddressUtils");
    }
  
    @Override
    public boolean isHelperClass(String className) {
      return className.startsWith("reactor.netty.http.client.HttpClientConfigBuddy");
    }
  
    @Override
    public List<String> injectedClassNames() {
      return singletonList("reactor.netty.http.client.HttpClientConfigBuddy");
    }
  
    @Override
    public List<TypeInstrumentation> typeInstrumentations() {
      return asList(
          new HttpClientInstrumentation(),
          new HttpClientConnectInstrumentation(),
          new ResponseReceiverInstrumentation(),
          new TransportConnectorInstrumentation());
    }
  }
  