content: /*
   * Copyright The OpenTelemetry Authors
   * SPDX-License-Identifier: Apache-2.0
   */
  
  package io.opentelemetry.javaagent.instrumentation.executors;
  
  import static io.opentelemetry.javaagent.extension.matcher.AgentElementMatchers.implementsInterface;
  import static net.bytebuddy.matcher.ElementMatchers.isPublic;
  import static net.bytebuddy.matcher.ElementMatchers.named;
  import static net.bytebuddy.matcher.ElementMatchers.takesArguments;
  
  import io.opentelemetry.context.Scope;
  import io.opentelemetry.instrumentation.api.util.VirtualField;
  import io.opentelemetry.javaagent.bootstrap.executors.PropagatedContext;
  import io.opentelemetry.javaagent.bootstrap.executors.TaskAdviceHelper;
  import io.opentelemetry.javaagent.extension.instrumentation.TypeInstrumentation;
  import io.opentelemetry.javaagent.extension.instrumentation.TypeTransformer;
  import java.util.concurrent.Callable;
  import net.bytebuddy.asm.Advice;
  import net.bytebuddy.description.type.TypeDescription;
  import net.bytebuddy.matcher.ElementMatcher;
  
  public class CallableInstrumentation implements TypeInstrumentation {
  
    @Override
    public ElementMatcher<TypeDescription> typeMatcher() {
      return implementsInterface(named(Callable.class.getName()));
    }
  
    @Override
    public void transform(TypeTransformer transformer) {
      transformer.applyAdviceToMethod(
          named("call").and(takesArguments(0)).and(isPublic()),
          CallableInstrumentation.class.getName() + "$CallableAdvice");
    }
  
    @SuppressWarnings("unused")
    public static class CallableAdvice {
  
      @Advice.OnMethodEnter(suppress = Throwable.class)
      public static Scope enter(@Advice.This Callable<?> task) {
        VirtualField<Callable<?>, PropagatedContext> virtualField =
            VirtualField.find(Callable.class, PropagatedContext.class);
        return TaskAdviceHelper.makePropagatedContextCurrent(virtualField, task);
      }
  
      @Advice.OnMethodExit(onThrowable = Throwable.class, suppress = Throwable.class)
      public static void exit(@Advice.Enter Scope scope) {
        if (scope != null) {
          scope.close();
        }
      }
    }
  }
  