content: /*
   * Copyright The OpenTelemetry Authors
   * SPDX-License-Identifier: Apache-2.0
   */
  
  package io.opentelemetry.javaagent.instrumentation.logback.appender.v1_0;
  
  import static io.opentelemetry.javaagent.instrumentation.logback.appender.v1_0.LogbackSingletons.mapper;
  import static net.bytebuddy.matcher.ElementMatchers.isMethod;
  import static net.bytebuddy.matcher.ElementMatchers.isPublic;
  import static net.bytebuddy.matcher.ElementMatchers.named;
  import static net.bytebuddy.matcher.ElementMatchers.takesArgument;
  import static net.bytebuddy.matcher.ElementMatchers.takesArguments;
  
  import ch.qos.logback.classic.spi.ILoggingEvent;
  import io.opentelemetry.api.GlobalOpenTelemetry;
  import io.opentelemetry.api.logs.LoggerProvider;
  import io.opentelemetry.javaagent.bootstrap.CallDepth;
  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;
  
  class LogbackInstrumentation implements TypeInstrumentation {
  
    @Override
    public ElementMatcher<TypeDescription> typeMatcher() {
      return named("ch.qos.logback.classic.Logger");
    }
  
    @Override
    public void transform(TypeTransformer transformer) {
      transformer.applyAdviceToMethod(
          isMethod()
              .and(isPublic())
              .and(named("callAppenders"))
              .and(takesArguments(1))
              .and(takesArgument(0, named("ch.qos.logback.classic.spi.ILoggingEvent"))),
          LogbackInstrumentation.class.getName() + "$CallAppendersAdvice");
    }
  
    @SuppressWarnings("unused")
    public static class CallAppendersAdvice {
  
      @Advice.OnMethodEnter(suppress = Throwable.class)
      public static void methodEnter(
          @Advice.Argument(0) ILoggingEvent event,
          @Advice.Local("otelCallDepth") CallDepth callDepth) {
        // need to track call depth across all loggers in order to avoid double capture when one
        // logging framework delegates to another
        callDepth = CallDepth.forClass(LoggerProvider.class);
        if (callDepth.getAndIncrement() == 0) {
          mapper()
              .emit(GlobalOpenTelemetry.get().getLogsBridge(), event, Thread.currentThread().getId());
        }
      }
  
      @Advice.OnMethodExit(onThrowable = Throwable.class, suppress = Throwable.class)
      public static void methodExit(@Advice.Local("otelCallDepth") CallDepth callDepth) {
        callDepth.decrementAndGet();
      }
    }
  }
  