content: /*
   * Copyright The OpenTelemetry Authors
   * SPDX-License-Identifier: Apache-2.0
   */
  
  package io.opentelemetry.javaagent.instrumentation.dropwizardmetrics;
  
  import static io.opentelemetry.javaagent.instrumentation.dropwizardmetrics.DropwizardSingletons.metrics;
  import static net.bytebuddy.matcher.ElementMatchers.named;
  import static net.bytebuddy.matcher.ElementMatchers.takesArguments;
  
  import com.codahale.metrics.Timer;
  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 TimerInstrumentation implements TypeInstrumentation {
  
    @Override
    public ElementMatcher<TypeDescription> typeMatcher() {
      return named("com.codahale.metrics.Timer");
    }
  
    @Override
    public void transform(TypeTransformer transformer) {
      transformer.applyAdviceToMethod(
          named("update").and(takesArguments(long.class)),
          this.getClass().getName() + "$UpdateAdvice");
    }
  
    @SuppressWarnings("unused")
    public static class UpdateAdvice {
  
      @Advice.OnMethodEnter(suppress = Throwable.class)
      public static void onEnter(@Advice.This Timer timer, @Advice.Argument(0) long nanos) {
        metrics().timerUpdate(timer, nanos);
      }
    }
  }
  