content: /*
   * Copyright The OpenTelemetry Authors
   * SPDX-License-Identifier: Apache-2.0
   */
  
  package io.opentelemetry.javaagent.instrumentation.rmi.server;
  
  import static io.opentelemetry.javaagent.bootstrap.rmi.ThreadLocalContext.THREAD_LOCAL_CONTEXT;
  import static io.opentelemetry.javaagent.extension.matcher.AgentElementMatchers.implementsInterface;
  import static io.opentelemetry.javaagent.instrumentation.rmi.server.RmiServerSingletons.instrumenter;
  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.nameStartsWith;
  import static net.bytebuddy.matcher.ElementMatchers.named;
  import static net.bytebuddy.matcher.ElementMatchers.not;
  
  import io.opentelemetry.context.Context;
  import io.opentelemetry.context.Scope;
  import io.opentelemetry.instrumentation.api.incubator.semconv.util.ClassAndMethod;
  import io.opentelemetry.javaagent.bootstrap.CallDepth;
  import io.opentelemetry.javaagent.extension.instrumentation.TypeInstrumentation;
  import io.opentelemetry.javaagent.extension.instrumentation.TypeTransformer;
  import java.rmi.Remote;
  import net.bytebuddy.asm.Advice;
  import net.bytebuddy.description.type.TypeDescription;
  import net.bytebuddy.matcher.ElementMatcher;
  
  public class RemoteServerInstrumentation implements TypeInstrumentation {
    @Override
    public ElementMatcher<TypeDescription> typeMatcher() {
      return implementsInterface(named("java.rmi.Remote"))
          .and(not(nameStartsWith("org.springframework.remoting")));
    }
  
    @Override
    public void transform(TypeTransformer transformer) {
      transformer.applyAdviceToMethod(
          isMethod().and(isPublic()).and(not(isStatic())),
          this.getClass().getName() + "$PublicMethodAdvice");
    }
  
    @SuppressWarnings("unused")
    public static class PublicMethodAdvice {
  
      @Advice.OnMethodEnter(suppress = Throwable.class)
      public static void onEnter(
          @Advice.Origin("#t") Class<?> declaringClass,
          @Advice.Origin("#m") String methodName,
          @Advice.Local("otelCallDepth") CallDepth callDepth,
          @Advice.Local("otelRequest") ClassAndMethod request,
          @Advice.Local("otelContext") Context context,
          @Advice.Local("otelScope") Scope scope) {
  
        callDepth = CallDepth.forClass(Remote.class);
        if (callDepth.getAndIncrement() > 0) {
          return;
        }
  
        // TODO review and unify with all other SERVER instrumentation
        Context parentContext = THREAD_LOCAL_CONTEXT.getAndResetContext();
        if (parentContext == null) {
          return;
        }
        request = ClassAndMethod.create(declaringClass, methodName);
        if (!instrumenter().shouldStart(parentContext, request)) {
          return;
        }
  
        context = instrumenter().start(parentContext, request);
        scope = context.makeCurrent();
      }
  
      @Advice.OnMethodExit(onThrowable = Throwable.class, suppress = Throwable.class)
      public static void stopSpan(
          @Advice.Thrown Throwable throwable,
          @Advice.Local("otelCallDepth") CallDepth callDepth,
          @Advice.Local("otelRequest") ClassAndMethod request,
          @Advice.Local("otelContext") Context context,
          @Advice.Local("otelScope") Scope scope) {
  
        if (callDepth.decrementAndGet() > 0) {
          return;
        }
        if (scope == null) {
          return;
        }
        scope.close();
        instrumenter().end(context, request, null, throwable);
      }
    }
  }
  