content: /*
   * Copyright The OpenTelemetry Authors
   * SPDX-License-Identifier: Apache-2.0
   */
  
  package io.opentelemetry.javaagent.instrumentation.jsp;
  
  import static io.opentelemetry.javaagent.instrumentation.jsp.JspCompilationContextInstrumentationSingletons.instrumenter;
  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.Context;
  import io.opentelemetry.context.Scope;
  import io.opentelemetry.javaagent.bootstrap.Java8BytecodeBridge;
  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.apache.jasper.JspCompilationContext;
  
  public class JspCompilationContextInstrumentation implements TypeInstrumentation {
  
    @Override
    public ElementMatcher<TypeDescription> typeMatcher() {
      return named("org.apache.jasper.JspCompilationContext");
    }
  
    @Override
    public void transform(TypeTransformer transformer) {
      transformer.applyAdviceToMethod(
          named("compile").and(takesArguments(0)).and(isPublic()),
          JspCompilationContextInstrumentation.class.getName() + "$CompileAdvice");
    }
  
    @SuppressWarnings("unused")
    public static class CompileAdvice {
  
      @Advice.OnMethodEnter(suppress = Throwable.class)
      public static void onEnter(
          @Advice.This JspCompilationContext jspCompilationContext,
          @Advice.Local("otelContext") Context context,
          @Advice.Local("otelScope") Scope scope) {
        Context parentContext = Java8BytecodeBridge.currentContext();
        if (!instrumenter().shouldStart(parentContext, jspCompilationContext)) {
          return;
        }
  
        context = instrumenter().start(parentContext, jspCompilationContext);
        scope = context.makeCurrent();
      }
  
      @Advice.OnMethodExit(onThrowable = Throwable.class, suppress = Throwable.class)
      public static void stopSpan(
          @Advice.This JspCompilationContext jspCompilationContext,
          @Advice.Thrown Throwable throwable,
          @Advice.Local("otelContext") Context context,
          @Advice.Local("otelScope") Scope scope) {
        if (scope == null) {
          return;
        }
  
        scope.close();
        instrumenter().end(context, jspCompilationContext, null, throwable);
      }
    }
  }
  