content: /*
   * Copyright The OpenTelemetry Authors
   * SPDX-License-Identifier: Apache-2.0
   */
  
  package io.opentelemetry.javaagent.instrumentation.micrometer.v1_5;
  
  import static net.bytebuddy.matcher.ElementMatchers.isTypeInitializer;
  import static net.bytebuddy.matcher.ElementMatchers.named;
  
  import io.micrometer.core.instrument.Metrics;
  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;
  
  public class MetricsInstrumentation implements TypeInstrumentation {
  
    @Override
    public ElementMatcher<TypeDescription> typeMatcher() {
      return named("io.micrometer.core.instrument.Metrics");
    }
  
    @Override
    public void transform(TypeTransformer transformer) {
      transformer.applyAdviceToMethod(
          isTypeInitializer(), this.getClass().getName() + "$StaticInitializerAdvice");
    }
  
    @SuppressWarnings("unused")
    public static class StaticInitializerAdvice {
      @Advice.OnMethodExit(suppress = Throwable.class)
      public static void onExit() {
        Metrics.addRegistry(MicrometerSingletons.meterRegistry());
      }
    }
  }
  