content: /*
   * Copyright The OpenTelemetry Authors
   * SPDX-License-Identifier: Apache-2.0
   */
  
  package io.opentelemetry.javaagent.instrumentation.apachedbcp.v2_0;
  
  import static io.opentelemetry.javaagent.instrumentation.apachedbcp.v2_0.ApacheDbcpSingletons.telemetry;
  import static net.bytebuddy.matcher.ElementMatchers.isPublic;
  import static net.bytebuddy.matcher.ElementMatchers.named;
  import static net.bytebuddy.matcher.ElementMatchers.takesArguments;
  
  import io.opentelemetry.javaagent.extension.instrumentation.TypeInstrumentation;
  import io.opentelemetry.javaagent.extension.instrumentation.TypeTransformer;
  import javax.management.ObjectName;
  import net.bytebuddy.asm.Advice;
  import net.bytebuddy.description.type.TypeDescription;
  import net.bytebuddy.matcher.ElementMatcher;
  import org.apache.commons.dbcp2.BasicDataSource;
  
  class BasicDataSourceInstrumentation implements TypeInstrumentation {
    @Override
    public ElementMatcher<TypeDescription> typeMatcher() {
      return named("org.apache.commons.dbcp2.BasicDataSource");
    }
  
    @Override
    public void transform(TypeTransformer typeTransformer) {
      typeTransformer.applyAdviceToMethod(
          isPublic().and(named("preRegister")).and(takesArguments(2)),
          this.getClass().getName() + "$PreRegisterAdvice");
  
      typeTransformer.applyAdviceToMethod(
          isPublic().and(named("postDeregister")),
          this.getClass().getName() + "$PostDeregisterAdvice");
    }
  
    @SuppressWarnings("unused")
    public static class PreRegisterAdvice {
      @Advice.OnMethodExit(suppress = Throwable.class)
      public static void onExit(
          @Advice.This BasicDataSource dataSource, @Advice.Return ObjectName objectName) {
        String dataSourceName;
        if (objectName != null) {
          dataSourceName = objectName.getKeyProperty("name");
          if (dataSourceName == null) {
            dataSourceName = objectName.toString();
          }
        } else {
          // fallback just in case it is somehow registered without a name
          dataSourceName = "dbcp2-" + System.identityHashCode(dataSource);
        }
        telemetry().registerMetrics(dataSource, dataSourceName);
      }
    }
  
    @SuppressWarnings("unused")
    public static class PostDeregisterAdvice {
      @Advice.OnMethodExit(suppress = Throwable.class)
      public static void onExit(@Advice.This BasicDataSource dataSource) {
        telemetry().unregisterMetrics(dataSource);
      }
    }
  }
  