content: /*
   * Copyright The OpenTelemetry Authors
   * SPDX-License-Identifier: Apache-2.0
   */
  
  package io.opentelemetry.javaagent.instrumentation.hikaricp.v3_0;
  
  import static net.bytebuddy.matcher.ElementMatchers.named;
  import static net.bytebuddy.matcher.ElementMatchers.takesArgument;
  import static net.bytebuddy.matcher.ElementMatchers.takesArguments;
  
  import com.zaxxer.hikari.metrics.MetricsTrackerFactory;
  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 HikariPoolInstrumentation implements TypeInstrumentation {
  
    @Override
    public ElementMatcher<TypeDescription> typeMatcher() {
      return named("com.zaxxer.hikari.pool.HikariPool");
    }
  
    @Override
    public void transform(TypeTransformer transformer) {
      // this method is always called in the HikariPool constructor, even if the user does not
      // configure anything
      transformer.applyAdviceToMethod(
          named("setMetricsTrackerFactory")
              .and(takesArguments(1))
              .and(takesArgument(0, named("com.zaxxer.hikari.metrics.MetricsTrackerFactory"))),
          this.getClass().getName() + "$SetMetricsTrackerFactoryAdvice");
    }
  
    @SuppressWarnings("unused")
    public static class SetMetricsTrackerFactoryAdvice {
  
      @Advice.OnMethodEnter(suppress = Throwable.class)
      public static void onEnter(
          @Advice.Argument(value = 0, readOnly = false) MetricsTrackerFactory userMetricsTracker,
          @Advice.FieldValue("metricsTracker") AutoCloseable existingMetricsTracker)
          throws Exception {
  
        if (existingMetricsTracker != null) {
          // we call close on the existing metrics tracker in case it's our wrapper, so that our
          // wrapper will unregister itself and won't keep recording metrics which leads to warnings
          // about duplicate metrics
          existingMetricsTracker.close();
        }
        userMetricsTracker = HikariSingletons.createMetricsTrackerFactory(userMetricsTracker);
      }
    }
  }
  