content: /*
   * Copyright The OpenTelemetry Authors
   * SPDX-License-Identifier: Apache-2.0
   */
  
  package io.opentelemetry.javaagent.instrumentation.jdbc.datasource;
  
  import static io.opentelemetry.javaagent.extension.matcher.AgentElementMatchers.implementsInterface;
  import static io.opentelemetry.javaagent.instrumentation.jdbc.JdbcSingletons.dataSourceInstrumenter;
  import static net.bytebuddy.matcher.ElementMatchers.named;
  import static net.bytebuddy.matcher.ElementMatchers.returns;
  
  import io.opentelemetry.context.Context;
  import io.opentelemetry.context.Scope;
  import io.opentelemetry.instrumentation.jdbc.internal.JdbcUtils;
  import io.opentelemetry.javaagent.bootstrap.Java8BytecodeBridge;
  import io.opentelemetry.javaagent.bootstrap.jdbc.DbInfo;
  import io.opentelemetry.javaagent.extension.instrumentation.TypeInstrumentation;
  import io.opentelemetry.javaagent.extension.instrumentation.TypeTransformer;
  import java.sql.Connection;
  import javax.sql.DataSource;
  import net.bytebuddy.asm.Advice;
  import net.bytebuddy.description.type.TypeDescription;
  import net.bytebuddy.matcher.ElementMatcher;
  
  public class DataSourceInstrumentation implements TypeInstrumentation {
  
    @Override
    public ElementMatcher<TypeDescription> typeMatcher() {
      return implementsInterface(named("javax.sql.DataSource"));
    }
  
    @Override
    public void transform(TypeTransformer transformer) {
      transformer.applyAdviceToMethod(
          named("getConnection").and(returns(named("java.sql.Connection"))),
          DataSourceInstrumentation.class.getName() + "$GetConnectionAdvice");
    }
  
    @SuppressWarnings("unused")
    public static class GetConnectionAdvice {
  
      @Advice.OnMethodEnter(suppress = Throwable.class)
      public static void start(
          @Advice.This DataSource ds,
          @Advice.Local("otelContext") Context context,
          @Advice.Local("otelScope") Scope scope) {
        Context parentContext = Java8BytecodeBridge.currentContext();
        if (!Java8BytecodeBridge.spanFromContext(parentContext).getSpanContext().isValid()) {
          // this instrumentation is already very noisy, and calls to getConnection outside of an
          // existing trace do not tend to be very interesting
          return;
        }
  
        if (dataSourceInstrumenter().shouldStart(parentContext, ds)) {
          context = dataSourceInstrumenter().start(parentContext, ds);
          scope = context.makeCurrent();
        }
      }
  
      @Advice.OnMethodExit(onThrowable = Throwable.class, suppress = Throwable.class)
      public static void stopSpan(
          @Advice.This DataSource ds,
          @Advice.Return Connection connection,
          @Advice.Thrown Throwable throwable,
          @Advice.Local("otelContext") Context context,
          @Advice.Local("otelScope") Scope scope) {
        if (scope == null) {
          return;
        }
        scope.close();
        DbInfo dbInfo = null;
        Connection realConnection = JdbcUtils.unwrapConnection(connection);
        if (realConnection != null) {
          dbInfo = JdbcUtils.extractDbInfo(realConnection);
        }
        dataSourceInstrumenter().end(context, ds, dbInfo, throwable);
      }
    }
  }
  