content: /*
   * Copyright The OpenTelemetry Authors
   * SPDX-License-Identifier: Apache-2.0
   */
  
  package io.opentelemetry.javaagent.instrumentation.reactor.v3_1.operator;
  
  import static net.bytebuddy.matcher.ElementMatchers.isMethod;
  import static net.bytebuddy.matcher.ElementMatchers.isPublic;
  import static net.bytebuddy.matcher.ElementMatchers.isStatic;
  import static net.bytebuddy.matcher.ElementMatchers.named;
  import static net.bytebuddy.matcher.ElementMatchers.namedOneOf;
  import static net.bytebuddy.matcher.ElementMatchers.returns;
  import static net.bytebuddy.matcher.ElementMatchers.takesArgument;
  
  import application.io.opentelemetry.context.Context;
  import io.opentelemetry.instrumentation.reactor.v3_1.ContextPropagationOperator;
  import io.opentelemetry.javaagent.extension.instrumentation.TypeInstrumentation;
  import io.opentelemetry.javaagent.extension.instrumentation.TypeTransformer;
  import io.opentelemetry.javaagent.instrumentation.opentelemetryapi.context.AgentContextStorage;
  import net.bytebuddy.asm.Advice;
  import net.bytebuddy.description.type.TypeDescription;
  import net.bytebuddy.matcher.ElementMatcher;
  
  public class ContextPropagationOperatorInstrumentation implements TypeInstrumentation {
    @Override
    public ElementMatcher<TypeDescription> typeMatcher() {
      return named(
          "application.io.opentelemetry.instrumentation.reactor.v3_1.ContextPropagationOperator");
    }
  
    @Override
    public void transform(TypeTransformer transformer) {
      transformer.applyAdviceToMethod(
          isMethod()
              .and(isPublic())
              .and(isStatic())
              .and(named("storeOpenTelemetryContext"))
              .and(takesArgument(0, named("reactor.util.context.Context")))
              .and(takesArgument(1, named("application.io.opentelemetry.context.Context")))
              .and(returns(named("reactor.util.context.Context"))),
          ContextPropagationOperatorInstrumentation.class.getName() + "$StoreAdvice");
      transformer.applyAdviceToMethod(
          isMethod()
              .and(isPublic())
              .and(isStatic())
              .and(named("getOpenTelemetryContext"))
              .and(takesArgument(0, named("reactor.util.context.Context")))
              .and(takesArgument(1, named("application.io.opentelemetry.context.Context")))
              .and(returns(named("application.io.opentelemetry.context.Context"))),
          ContextPropagationOperatorInstrumentation.class.getName() + "$GetAdvice");
      transformer.applyAdviceToMethod(
          isMethod()
              .and(isPublic())
              .and(isStatic())
              .and(named("runWithContext"))
              .and(
                  takesArgument(
                      0, namedOneOf("reactor.core.publisher.Mono", "reactor.core.publisher.Flux")))
              .and(takesArgument(1, named("application.io.opentelemetry.context.Context")))
              .and(returns(namedOneOf("reactor.core.publisher.Mono", "reactor.core.publisher.Flux"))),
          ContextPropagationOperatorInstrumentation.class.getName() + "$RunWithAdvice");
    }
  
    @SuppressWarnings("unused")
    public static class StoreAdvice {
      @Advice.OnMethodEnter(suppress = Throwable.class, skipOn = Advice.OnDefaultValue.class)
      public static boolean methodEnter() {
        return false;
      }
  
      @Advice.OnMethodExit(suppress = Throwable.class)
      public static void methodExit(
          @Advice.Argument(0) reactor.util.context.Context reactorContext,
          @Advice.Argument(1) Context applicationContext,
          @Advice.Return(readOnly = false) reactor.util.context.Context updatedReactorContext) {
        updatedReactorContext =
            ContextPropagationOperator.storeOpenTelemetryContext(
                reactorContext, AgentContextStorage.getAgentContext(applicationContext));
      }
    }
  
    @SuppressWarnings("unused")
    public static class GetAdvice {
      @Advice.OnMethodEnter(skipOn = Advice.OnDefaultValue.class)
      public static boolean methodEnter() {
        return false;
      }
  
      @Advice.OnMethodExit(suppress = Throwable.class)
      public static void methodExit(
          @Advice.Argument(0) reactor.util.context.Context reactorContext,
          @Advice.Argument(1) Context defaultContext,
          @Advice.Return(readOnly = false) Context applicationContext) {
  
        io.opentelemetry.context.Context agentContext =
            ContextPropagationOperator.getOpenTelemetryContext(reactorContext, null);
        if (agentContext == null) {
          applicationContext = defaultContext;
        } else {
          applicationContext = AgentContextStorage.toApplicationContext(agentContext);
        }
      }
    }
  
    @SuppressWarnings("unused")
    public static class RunWithAdvice {
      @Advice.OnMethodEnter
      @Advice.AssignReturned.ToFields(@Advice.AssignReturned.ToFields.ToField("enabled"))
      public static boolean methodEnter() {
        return true;
      }
    }
  }
  